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What Are the Side Effects of PET CT Scan?

Leave a Comment / PET CT Scan /

PET CT Scan (Positron Emission Tomography-Computed Tomography) is considered a cutting-edge exam in the currently available repertoire of diagnostic imaging tests, to diagnose a variety of diseases, particularly cancers. PET CT may also be used to interpret conditions involving neurological or cardiac abnormalities. PET CT may also allow physicians to discover the condition at a much earlier stage than may be evident to the patient. PET CT is relatively safe too and has unique advantages in differentiation of diagnoses evaluated compared to more traditional assessments such as MRI Scan, CT scan and other forms of diagnostic imaging procedures. 

However, side effects of a PET CT cannot be overlooked in the patient population, given the multiple side effects that can happen to patients with different medical conditions. Side effect severity can range from mild to moderate to moderate severity depending on the individual patient condition.

List of Side Effects of PET CT Scan

Radiation Exposure

  • Radiation exposure from the PET CT procedure is one of the easiest but serious side effects of PET CT testing.
  • Repeated testing can lead to radiation exposure, which can lead to a significant health condition.
  • Temporary exposure to radiation is not harmful, but in some circumstances, such as pregnancy, exposure can be dangerous.
  • Radiation exposure is low, during the testing, but the level of exposure can be damaging to children and pregnant women.
  • This can result in complications.

Allergic Reactions from Radioactive Tracer

  • PET CT scans utilize radioactive tracers such as FDG glucose. Some individuals may experience allergies due to these radioactive tracers.
  • The allergies related to radioactive tracers can range from mild to severe.
  • Mild allergies may include symptoms like nausea, vomiting, rash, redness, etc.
  • Severe allergic reactions may include swelling, difficulty in breathing, shortness of breath, and organ dysfunction like kidney issues.
  • Severe allergic reactions should be treated in a timely manner and promptly taken to the hospital.

Discomfort from Injection

  • Some patients may be very uncomfortable with the injection of radioactive tracer. 
  • There may be symptoms like redness, pain, and swelling post injection. 
  • Symptoms of tenderness or bruising may still be present post injection. 
  • Swelling at the injection site with a rash. 
  • There is a slight possibility of infection at the injection site.

Low Blood Sugar in Diabetic Patients

  • Patients with diabetes should be cautious during the test and must disclose that they are diabetic before undergoing the test.
  • The physician will provide instruction for the diabetic patient regarding taking the radioactive tracer.
  • Incorrect uptake of insulin could pose serious problems if the patient were to become hypoglycemic.
  • Diabetic patients will always be provided specialized instructions to avoid any type of side effect or ambiguity regarding the PET CT scan.

Side Effects of Contrast Dye

  • PET CT scan requires contrast dye to obtain accurate scanning and better pictures of the area of interest.
  • Dye contrast used in PET CT scan may have different side effects including nausea, headache, vomiting, and other medical conditions.
  • There may be a rare risk of an infection at the injection site.
  • Dye contrast may be harmful to the kidneys and may cause kidney failure in rare cases.

6. Temporary Increase in Radiation in the Body

  • PET CT scan uses radioactive radiation, which can increase the radiation level in body for some time.
  • Remains of radioactive tracer in the body after contrast dye.
  • Avoid contact with infants, children and other people for about 12-24 hours till radiation gets low.
  • Intake of water in large quantity to flush out radioactive tracer.

Pregnancy and Breastfeeding Concerns

  • Expectant women are advised to undergo PET CT scan only in crying emergency.
  • If absolutely necessary, there are protocols to preform a PET CT scan.
  • You are advised to avoid breast feeding for 24 hours after the PET CT scan, as the radiation taken in will have been neutralized & dye should be out of your system after this time.

Claustrophobia and Anxiety

  • A PET CT scan is a closed space machine, which can evoke fears of claustrophobia in patients. 
  • The test may lead to anxious thoughts in patients. 
  • Some patients may become distressed and restless by simply thinking about the results of the test. 
  • The procedure requires the patient to stay in a supine position for about 30-60 minutes. 
  • This may be an uncomfortable duration for some patients.

Fatigue After the Scan

  • The PET CT procedure is complicated and busy, which the patient may feel fatigue.  
  • The patient must fast for at least 6 hours, which can be a contributor to fatigue and tiredness.  
  • After several hours of testing, food and hydration will help to regain strength.

Some Rare Side Effects

  • The patient may experience dizziness, headache, vomiting, etc.
  • These do not need any treatment and will resolve on their own.
  • In very rare cases, some allergic reactions may lead to kidney damage or failure.

Also Read: Difference Between PET CT Scan and Ultrasound

What Precautions Should be Taken After a PET CT Scan?

  • Stay hydrated
  • Avoid physical contact with children up to 24 hours
  • Follow medical directions
  • Disclose any allergic condition before going for test
  • Continue contact with a doctor until the symptoms are all gone

Conclusion

PET CT scan is a very efficient and advanced test used to look for medical conditions like cancer, neurological problems and cardiac abnormalities. PET CT scan uses radiation with radioactive tracer, which helps to detect the condition early even when symptoms are not visible. There are various side effects of PET CT scan and these include exposure to radiation, allergic conditions, not suitable for pregnant women etc. 

Even though the advantages exceed the side effects of the test, this is why the test is used for the most cancer conditions. This test helps to detect the condition very early even when symptoms are not visible to the patient. PET CT is almost safe and has various benefits over conventional testing procedures like MRI, CT and other radiological tests.

Frequently Asked Questions

Q. Can PET CT scans cause cancer?

The risk is extremely small, but radiation exposure may slightly increase long-term risk. The benefits usually outweigh this concern.

Q. Is PET CT safe for children?

It is generally avoided unless absolutely necessary due to children’s sensitivity to radiation.

Q. Does PET CT cause kidney problems?

In some rare cases, there may be problems related to kidneys due to PET CT scan.

Q. What are the side effects of PET CT scan?

There are various side effects like allergy, radiation exposure, not good pregnant women etc.

What Are the Side Effects of PET CT Scan? Read More »

Difference Between PET CT Scan and Ultrasound

Leave a Comment / PET CT Scan, Ultrasound Scan /

PET CT Scan and ultrasound scan are two types of diagnostic imaging used to evaluate abnormality in the body. Both are non-invasive procedures meaning they do not involve any type of surgical procedure. The PET CT scan is a more advanced imaging modality in comparison to ultrasound scan because it utilizes a radioactive tracer in evaluation of abnormality. PET CT scan is more expensive but another advantage of the PET CT scan is that it provides enhanced detail in evaluation of body systems and it can even evaluate cancerous conditions at a metabolic or functional level. 

PET CT scan is advised by the doctor in case of suspicion of any form of cancer, look for treatment response, evaluate metastasis to various body systems and assist with tailoring the best treatment course.  Ultrasound on the other hand is a simpler, cost effective and fast procedure which is used to evaluate for abnormality using sound waves. 

The ultrasound machine is equipped with a transducer that uses sound waves to visualize and assess for abnormality in the body.  Ultrasound is commonly used for pregnancy monitoring and assessment of basic functional abnormalities like kidney stones, liver disease assessment, gallstones, etc. Ultrasound would be the preferred testing modality since there is no exposure to any type of radiation. 

What is PET CT?

(PET CT – positron emission tomography) is a very advanced diagnostic procedure that integrates a PET scan and CT scan to evaluate for abnormality in the body. PET CT utilizes a radioactive tracer, typically FDG, to evaluate for abnormality.

Common Uses of PET CT:

  • Detecting and staging cancers.
  • Monitoring response to cancer treatment.
  • Identifying recurrence or spread of tumors.
  • PET CT is helpful in heart diseases 
  • It helps to check blood flow within the heart and functions.
  • PET CT is effective in detecting neurological abnormalities like epilepsy, Alzheimer’s disease etc.

What is Ultrasound?

Ultrasound uses sound waves of high frequency for the detection of abnormalities in the body. Ultrasound is commonly referred to as sonography which provides real time images of the body organs. Sound waves produced by the transducer bounce back and help to make the real time images of the organs.

What Are The Uses of Ultrasound?

  • Mainly used to monitor pregnancy. 
  • Used to monitor growth and development of the fetus. 
  • Assists in detecting kidney stones. 
  • Assists in detecting gallstones. 
  • Assists in assessing heart function. 
  • Helpful in identifying gallstones, liver disorders etc. 
  • Can identify tumors. Can help guide procedures.

Differences Between PET Scan and Ultrasound

FeaturesPET CT scanUltrasound
Technology UsedCombines radioactive tracer with CT imagingSound waves for the real time image generation
Type of InformationBoth functional and anatomical detailsStructural and motion based images
RadiationYesNo
Details of ImagingHighly detailed imagesReal time images with less detail
Best suitable forCancers, heart and neurological diseasesPregnancy, abdominal organs and fluid detection
Time takenAround 1 to 2 hoursAround 15 to 30 minutes
CostVery ExpensiveAffordable
Portability and AvailabilityNot portable, less availabilityPortable and widely available
Safety  ConcernRadiation exposure not suitable for pregnant womenNo radiation exposure and is safe for pregnant women
Real Time ImagingProvides static images with structural dataProvides real time images with movement

What Are the Advantages of PET CT?

PET CT imaging integrates functional and anatomical imaging, and thus is extremely effective in determining stages for cancer. PET CT can distinguish between malignant and benign cancer and is very helpful in detecting spread, or metastases, of the cancer in the body. The imaging also provides this useful information for treatment, and, if treatment is ongoing, for assessment of therapy. 

In addition to being important for detecting recurrence of cancer, PET CT is very powerful for diagnosing neurological abnormality. PET CT imaging can optimize body imaging by utilizing wider angles to help eliminate unwarranted invasive procedures and provide patients with the right care at the right time.

What Are the Advantages of Ultrasound

Ultrasound imaging does not expose the patient to radiation and is therefore safe for diagnostic testing of quality assessments. It is also relatively inexpensive, quick, and generally more accessible than other diagnostic testing. Ultrasound is easy to transport and is very effective. 

The biggest advantage of ultrasound is that it provides real-time moving images, which allows gallstones, for example, to be directly visualized, and it can help guide some surgical interventions as well. Ultrasound is non-invasive and is safe to use repeatedly, especially for longitudinal observations of patients with chronic diseases or conditions. Ultrasound can also be done rather easily in an outpatient/practice setting, and is typically a convenience, both for the patient and the clinician.

Also Read: Difference Between PET CT Scan and MRI Scan

PET CT Limitations

  • Expensive in comparison to ultrasound.
  • Scans expose the patient to radiation.
  • The scan requires specialized scans to have the doctor interpret the images. 
  • Should not be used in pregnancy.
  • Does not detect small tumors or tumors with a low metabolism.

Ultrasound Limitations

  • Has less excursion than the PET CT.
  • Does not show metabolic information.
  • Can be unclear especially in obese patients.
  • Dependent upon technician and thus can vary in quality.
  • Limited to deeper/more complex structures inside.

Conclusion

PET CT scan is a more advanced and detailed diagnostic procedure when compared to other modalities like ultrasound, CT, and MRI. Ultrasound utilizes sound waves to detect abnormalities in the body and allows the real time imaging for organs in motion. Ultrasound is much more affordable and widely used compared to PET CT. 

There are many advantages and disadvantages to both modalities and a physician will recommend a specific procedure after knowing the history and symptoms of the condition. PET CT is used for cancer conditions like stage, metastasis, treatment effectiveness, etc. Ultrasound is often used for pregnancy and well-being of the fetus. Additionally, it is used to identify abnormalities in abdominal organs.

Difference Between PET CT Scan and Ultrasound Read More »

Difference Between PET CT Scan and MRI Scan

Leave a Comment / MRI Scan, PET CT Scan /

PET CT scan and MRIs are two common imaging techniques used for the diagnosis of abnormalities in the body. Both tests rely on different sets of principles for detection of abnormalities in the body. PET CT scan is more advanced than MRI, as PET scan uses radioactive tracer for detection of abnormalities in the body. 

The chief advantage of PET CT over MRI is that PET CT can detect cancer at a very early metabolic stage when the symptoms are not even clear or visible to the patient. 

MRI uses laws of magnetism for detection of abnormality-MRI uses magnetic field to create images of the abnormality. MRI also uses magnetic waves which can displace metallic implants. Therefore, MRI is not practical for patients who have metallic implants in their body. Although PET CT scan uses radioactive tracer, it may cause allergy in some patients and also exposes patient to any radiations.

What is PET CT Scan?

PET CT scan is the combination of Positron Emission Technology (PET) and Computed Tomography (CT Scan) for creating images to detect abnormalities in the body. PET CT scan uses radioactive tracer like FDG (Fluorodeoxyglucose) which can detect abnormality at the metabolic level. Radioactive tracer highlights the abnormal cells, which consumes more glucose comparing normal cells. CT helps to create the images of the condition and helps to detect the area suffering cancer condition.

Also Read: How Whole Body PET Scan Is The Best Option For Cancer Staging?

Main Uses of PET CT:

  • Helps to detect cancer in any part of the body
  • Helps to detect the stage of cancer
  • Helps to monitor the cancer before and after treatment
  • Evaluating heart function and blood flow
  • PET CT is very helpful in detecting neurological diseases like epilepsy, Parkinson’s  and Alzheimer

What is MRI?

MRI is another imaging diagnostic procedure that used different principle for diagnosis comparing PET CT scan. MRI uses magnetic waves for the detection of abnormalities in the body by highlighting the anatomy of the site. MRI also uses contrast material in some cases to detect the condition more accurately and easily. MRI has the advantage over PET CT of not exposing patient to harmful radiations.

What Are The Main Functions of MRIs? 

MRI is highly useful and specific to abnormality detection of soft tissue structures, like the brain, muscle, and surrounding tissues. MRI is essential in brain imaging after strokes, assessing multiple sclerosis, and identifying different tumor types. MRI is also useful for spinal cord evaluation. MRI is often used to image joints, cartilage, and ligaments, they can also be used to image organs in the abdomen. MRI can also be an important factor to identify abnormalities related to the heart and heart vessels or surrounding tissue specific to the heart.

FeaturePET CT ScanMRI Scan
Technology UsedX-rays with radioactive tracerMagnetic field with radiofrequency waves
Information ProvidedMetabolic activity, functional process and anatomical detailHigh resolution  structure and soft tissue details
Radiation ExposureExposure of radiation due to CT scan and radioactive tracerNo radiation used
Best ForCancer, Metastasis, Treatment, Active diseasesBrain, Muscles, Ligaments, Tissues
Duration40 to 70 minutes30 to 90 minutes
PreparationRequires fasting and radioactive injection is neededPatient need to remove metallic objects
SafetyRadiation exposure, not suitable for pregnant womenNot applicable for patient with metallic implants like pacemaker
DetectionEarly detection at metabolic level before structure changes appearDetects structural changes
CostMore expensiveExpensive and depends on body part to be scanned
AvailabilityLimited AvailabilityMore widely available comparing PET CT

When Do Doctors Utilize A PET CT Scan? 

PET CT is typically performed when – cancer is suspected – whether to see if cancer has spread or to evaluate treatment efficacy – or to locate recurrent tumor activity- not including its ever-evolving role in studying brain lesions and identifying heart disease. 

When Do Physicians Utilize MRI? 

MRI can typically be useful when an image of the brain is necessary, which includes anything from a herniated disc or spinal cord compression, as well as musculoskeletal evaluation (i.e. cartilage, ligaments, bones) to imaging of abdominal or pelvic organs, and even ruling out cardiovascular disease and complex imaging for evaluation.

What are the Benefits of PET CT and MRI? 

PET CT has several benefits, including early detection of metabolic changes, and the ability to get both functional and anatomical imaging in a single scan. PET CT is useful for cancer staging and monitoring, and in the identification of metastases which may be missed on CT or MRI alone, and is a central element in treatment planning for patients with cancer.

MRI has it’s own advantages as well. MRI has zero radiation, gives better detail of soft tissues, and is safe for repeat scans. MRI is also very useful in detecting problems in the CNS in the brain and spine, provides a detailed view of protective and functional function of musculoskeletal structures when looking for tears and fractures, and in some cases can provide 3D imaging without the use of contrast.

Limitations of PET CT

  • Radiation exposure to the patient
  • High cost and limited availability
  • Need radioactive tracer like FDG glucose
  • Not suitable for pregnant patients

Limitations of MRI

  • Time-consuming and noisy scan.
  • Fear of closed spaces in some patients
  • Not applicable for patient with metallic implants in the body
  • More expensive than CT scans.

Conclusion

PET CT and MRI are advanced diagnostic techniques that produce images for identifying abnormalities in the body. PET CT is more advanced, expensive, and specifically targeted compared to MRI scan. The principal advantage of PET CT over MRI scan is that PET CT is able to detect the cancer at a very early stage of metabolism, at a stage that the patient is asymptomatic or presenting symptoms at a late stage. 

In contrast, the MRI scan uses the principle of magnetism as a means to detect abnormality. MRI scan uses magnetic field to create images of abnormality in health. 

Additionally, as a magnetic wave can displace metallic implant, it is not applicable for patients with metallic implant in their body. There are several advantages and disadvantages of both these diagnostic procedures with the decision being made by an individual provider.

Frequently Asked Questions

Q. Which test is more specific PET CT or MRI?

PET CT is more specific comparing MRI scan.

Q. Which test is more expensive PET CT or MRI?

PET CT scan is more expensive comparing MRI scan.

Q. Which test is suitable for pregnant women PET CT or MRI?

MRI is suitable for pregnant women because MRI does not use radiation.

Q. Which test is more suitable widely available PET CT or MRI?

MRI is widely available comparing PET CT scan.

Q. Where to get PET scan in Delhi?

You can contact carebox to book your PET scan at cheapest cost.

Difference Between PET CT Scan and MRI Scan Read More »

What is the Difference Between MRI Scan and PET CT Scan?

Leave a Comment / CT Scan, PET CT Scan /

Medical imaging has transformed the way doctors diagnose and treat diseases. Among the most advanced techniques, MRI (Magnetic Resonance Imaging) Scan and PET CT (Positron Emission Tomography – Computed Tomography) Scan stand out for their precision and ability to provide detailed insights.

But many patients often wonder: What is the difference between MRI and PET CT scan? Do they serve the same purpose, or does one offer better results than the other?

In this blog, we’ll break down the differences between the two scans, their uses, preparation, safety, and costs — in simple, easy-to-understand language. By the end, you’ll know exactly when an MRI is preferred and when a PET CT scan is recommended.

Understanding MRI Scan

MRI Scan is a non-invasive imaging test that uses powerful magnets and radio waves to create highly detailed images of the inside of your body.

  • How it works: MRI does not use radiation. Instead, it relies on a strong magnetic field that aligns hydrogen atoms in your body. Radio waves then capture signals to form clear images of tissues and organs.
  • Best for: Soft tissue imaging such as the brain, spinal cord, muscles, ligaments, heart, and internal organs.
  • Key advantage: Provides excellent structural details without radiation.

Understanding PET CT Scan

A PET CT Scan is a combination of Positron Emission Tomography (PET) and Computed Tomography (CT Scan).

  • How it works: Before the scan, a small amount of radioactive tracer (usually a sugar-based compound) is injected into your body. Cancer cells and other active tissues absorb more tracer, which allows doctors to detect abnormal activity. The CT part adds detailed anatomical images, making the scan both functional and structural.
  • Best for: Detecting cancer, monitoring response to treatment, evaluating heart conditions, and studying brain disorders.
  • Key advantage: Shows both how tissues look and how they function.

MRI Scan vs. PET CT Scan: Key Differences

AspectMRI ScanPET CT Scan
TechnologyUses magnetic fields & radio wavesCombines radioactive tracer (PET) + X-rays (CT)
RadiationNo radiationInvolves low-dose radiation
FocusProvides structural detailsProvides functional + structural details
Best ForBrain, spine, joints, soft tissuesCancer detection, heart function, brain metabolism
Time Taken30–60 minutes30–45 minutes
AccuracyVery detailed for anatomyHigh sensitivity for detecting disease activity
AvailabilityWidely available in hospitals & diagnostic centresAvailable in specialised centres
CostModerateHigher compared to MRI

When is MRI Scan Recommended?

Doctors may suggest an MRI scan in conditions such as:

  • Brain stroke, tumours, or multiple sclerosis
  • Spinal cord injuries
  • Joint injuries (ligaments, cartilage, meniscus tears)
  • Heart or blood vessel abnormalities
  • Pelvic or abdominal organ issues

Why MRI? Because it provides sharp, detailed images of soft tissues without radiation.

When is PET CT Scan Recommended?

PET CT is usually advised in cases like:

  • Detecting and staging cancer
  • Checking if cancer has spread (metastasis)
  • Evaluating effectiveness of chemotherapy or radiation therapy
  • Assessing heart conditions like reduced blood flow
  • Identifying brain disorders such as Alzheimer’s or epilepsy

Why PET CT? Because it shows active disease processes inside the body along with precise anatomical details.

Safety Comparison

  • MRI Scan: Safe for most people but not suitable for patients with pacemakers, cochlear implants, or certain metallic implants.
  • PET CT Scan: Safe, but since it uses a radioactive tracer, pregnant women and breastfeeding mothers are usually advised to avoid it.

Preparation for MRI vs. PET CT Scan

  • MRI Preparation:
    • Remove all metallic objects.
    • May require fasting if contrast dye is used.
    • Patients with claustrophobia may need mild sedation.
  • PET CT Preparation:
    • Fast for 6–8 hours before the scan.
    • Avoid exercise 24 hours prior.
    • Diabetic patients need special instructions for insulin and diet.

Cost Comparison

  • MRI Scan Cost: Depends on the type (Brain, Spine, Abdomen, etc.), usually ranging from ₹3999 – ₹15,000 in India.
  • PET CT Scan Cost: More expensive due to the tracer and advanced technology, ranging from ₹10,000 – ₹30,000 in India.

Which is Better: MRI or PET CT?

Neither is “better” universally — it depends on the condition:

  • MRI is better for soft tissue and anatomical imaging.
  • PET CT is better for cancer detection, staging, and treatment monitoring.

In many cases, doctors may even recommend both scans together for the most accurate diagnosis.

Final Thoughts

Both MRI Scan and PET CT Scan play crucial roles in modern healthcare. While MRI provides high-resolution structural images, PET CT goes deeper by revealing how tissues and cells are functioning.

If your doctor recommends either of these scans, it’s because each test provides unique insights that help in accurate diagnosis and treatment. Always consult your healthcare provider to know which scan is right for your condition.

FAQs on MRI vs. PET CT Scan

Q1. Does MRI show cancer like PET CT?

MRI can show tumours and structural changes, but PET CT is more sensitive for detecting active cancer cells.

Q2. Which scan is safer?

MRI is safer because it does not use radiation. PET CT involves low-dose radiation but is still considered safe for most patients.

Q3. Is PET CT always required for cancer?

Not always. Some cancers can be monitored with MRI or CT, but PET CT is often recommended for accurate staging and tracking treatment response.

Q4. Can children undergo MRI or PET CT?

Yes. MRI is commonly used for children. PET CT may be used when necessary, but radiation exposure is carefully considered.

Q5. Which scan is more expensive?

PET CT is generally more expensive than MRI.

What is the Difference Between MRI Scan and PET CT Scan? Read More »

Why Do Doctors Recommend PET CT Scan in Cancer?

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Cancer is one of the most complex diseases, and its diagnosis and treatment require high precision. To ensure accuracy, doctors often recommend a PET CT Scan. Many patients wonder, “Why is PET CT suggested in cancer when other scans like MRI or CT are available?”

The answer lies in the unique ability of PET CT to show both structure and function of tissues in the body. Let’s explore in detail why PET CT is so important in cancer diagnosis and treatment.

What is a PET CT Scan?

A PET CT Scan (Positron Emission Tomography – Computed Tomography) combines two imaging techniques:

  • PET (Positron Emission Tomography): Uses a small amount of radioactive tracer (usually a sugar-like substance) to highlight areas of high metabolic activity. Cancer cells, which grow and consume sugar rapidly, absorb more tracer and appear brighter on the scan.
  • CT (Computed Tomography): Provides detailed anatomical images of the body.

When combined, PET CT shows not only where a tumour is located but also how active it is.

Why Do Doctors Recommend PET CT in Cancer?

1. Early Detection of Cancer

Cancer cells behave differently from normal cells — they grow faster and consume more energy. PET CT detects this abnormal activity at a very early stage, sometimes even before structural changes appear on MRI or CT.

2. Accurate Staging of Cancer

Staging tells doctors how advanced the cancer is and whether it has spread. PET CT helps in:

  • Detecting the primary tumour
  • Finding if cancer has spread to lymph nodes
  • Checking for metastasis (spread to distant organs)

This is crucial for planning the right treatment.

3. Treatment Planning

Doctors use PET CT results to design a personalised treatment plan. For example:

  • Deciding if surgery is possible
  • Planning radiation therapy by mapping exact tumour sites
  • Choosing between chemotherapy, targeted therapy, or immunotherapy

4. Monitoring Treatment Response

Not all treatments work the same for every patient. PET CT allows doctors to see if the cancer is responding to treatment.

  • If the tumour is shrinking or showing less activity, the treatment is working.
  • If cancer is still active, doctors can change the treatment plan quickly.

5. Detecting Recurrence

Even after successful treatment, there is always a risk of cancer coming back. PET CT can detect recurrence early, often before symptoms appear. This ensures timely intervention.

PET CT vs. Other Scans in Cancer

  • CT or MRI: Show detailed structure (size, shape, location) but cannot always tell if a tumour is active or dead tissue.
  • PET CT: Shows both structure and function, helping differentiate between scar tissue and active cancer.

Is PET CT Safe for Cancer Patients?

Yes, PET CT is considered safe. The radioactive tracer used is in very small amounts and usually leaves the body within 24 hours through urine. However, it may not be recommended for pregnant or breastfeeding women.

Cost of PET CT in Cancer

In India, PET CT scan costs usually range between ₹15,000 to ₹30,000, depending on the city, hospital, and type of tracer used. While it is more expensive than MRI or CT, the comprehensive information it provides makes it highly valuable in cancer care.

Final Thoughts

Doctors recommend PET CT scans in cancer because they provide the most accurate and complete picture of the disease. From early detection to staging, treatment planning, monitoring, and recurrence detection, PET CT plays a vital role in saving lives.

If your doctor has suggested a PET CT scan, it is not just another test — it is an essential step to ensure you receive the best possible cancer treatment.

FAQs on PET CT in Cancer

Q1. Can PET CT detect all types of cancer?

Not all cancers are easily visible on PET CT, but it is highly effective for lung, lymphoma, head & neck, breast, colorectal, and other cancers.

Q2. Is PET CT painful?

No. The scan is painless. The only discomfort may be the injection of the tracer.

Q3. How long does a PET CT scan take?

The procedure usually takes about 2–3 hours, including preparation and scan time.

Q4. Can PET CT replace biopsy?

No. PET CT shows abnormal activity, but a biopsy is still required to confirm cancer diagnosis.

Q5. How often should a cancer patient undergo PET CT?

This depends on the treatment plan. Some patients may need scans before, during, and after treatment, as advised by their doctor.

Why Do Doctors Recommend PET CT Scan in Cancer? Read More »

What is a Brain PET Scan and How is It Performed?

PET CT Scan /

A computer receives the data from the PET detector and uses the data to create a three-dimensional picture, which exposes areas of high activity, such as, tumors or neurological diseases (e.g., Alzheimer’s disease, Parkinson’s disease, epilepsy).

What is a Brain PET Scan?

A brain PET scan (Positron emission tomography of the Brain) is a scanning process that allows doctors to assess the activity of your brain. With a brain PET scan, you will have radioactive “tracers” injected, which they get mixed into your blood stream, then as the scan happens it will take images of the activity in the brain. 

These chemicals, such as glucose (which is the brain’s energy source), all contained what are called tracers that were “tagged” on them (sugar). The brain will consume glucose faster in areas where there is more activity than in areas where there is less. This can be seen with a PET scanner, which helps the physicians assess how the brain is operating and assess any abnormalities.

How is a Brain PET Scan Performed?

You will enter the procedure room and find yourself in a chair. The technician will place an intravenous catheter (IV) into your arm. The technician will inject some special dye with radioactive tracers into your veins through this IV. 

After the waiting time is over, the scan will be performed. To do this, you will get on a small table connected to the PET machine.

You will have to stay still during the scan. The technician will tell you when to stay still.

The scans record brain activity as it occurs. This activity may be in video and still images. The tracers are denser where there is greater blood flow.

Also Check: Whole Body PET Scan: Purpose, Procedure, Benefits & Patient Guide

What is the Purpose of a Brain PET CT Scan?  

This test provides accurate information about the size, structure, and functions of the brain. A brain PET scan, as opposed to a regular scan, will show doctors an image of the brain that shows not only anatomy but also functioning.  

It helps Diagnose:  

  • Screening for cancer and its spread to the brain  
  • Diagnoses dementias, including  Alzheimer’s disease  
  • Differentiates Parkinsonism from other brain disorders  
  • Pre-surgical epilepsy  

How Do I Prepare for a Brain PET Scan? 

Make sure to tell your doctor about any medications you take, including prescription, over-the-counter, and dietary supplements.  

  • You may be asked not to eat anything before your treatment for  up to six hours. Water is allowed.  
  • You should notify your doctor if you think you may be pregnant or are pregnant.  
  • You should also disclose to your doctor any current medical conditions.  

Preparation for the Procedure

  • Do not consume food or drink for 6 hours prior to your exam although you can hydrate (you are encouraged to hydrate, as much as you can prior to arriving). 
  • Routine medications are permitted, unless indicated otherwise. If you have diabetes, you may take your diabetes medications no less than 4 hours prior to the exam. 
  • The technologist will confirm your identification and the exam you are booked for. 
  • You will be required to complete a contrast screening form. 
  • In some cases you may be instructed to have lab tests prior to contrast being given by the doctor. 

Conclusion

A brain PET scan utilizes imaging of the brain’s structure, function, and activity. The PET scan can detect areas with altered metabolism or disease in the brain or abnormal blood flow to the brain to help physicians more accurately determine the diagnosis of cancers, Alzheimer’s disease, Parkinson’s disease or epilepsy and help make treatment decisions.

Frequently Asked Questions

Q. What is a PET Scan of the Brain For?

Brain PET CT scan is to identify disorders like tumours and Alzheimer’s disease.

Q. How to Find the Best Imaging Centre Near Me in Delhi NCR?

You can simply search the best imaging centre near me on Google or call the carebox directly for consultation.

Q. Does a PET Scan Show all Cancers?

No, PET CT scan cannot detect and display all kinds of cancers. Physicians utilized other technologies and techniques to identify cancers and its kind/

Q. What is the Full Form of CT Scan?

CT scan means the Computed Tomography scan.

Q. Can PET Scan Detect a Brain Tumor?

Yes, PET CT scan can identify brain tumours.

What is a Brain PET Scan and How is It Performed? Read More »

Whole Body PET Scan: Purpose, Procedure, Benefits & Patient Guide

PET CT Scan /

A Whole Body PET (Positron Emission Tomography) scan is an imaging modality which uses a small amount of a radioactive tracer, usually a glucose based solution, to assist in the diagnosis and monitoring of numerous diseases such as cancer, heart disease, and neurological diseases.The tracers will assist in measuring metabolic activity at the cellular level across the entire body. 

Are You Interested in Whole Body PET Scan? 

Whole body PET scan utilizes radioactive tracers to detect cancer cells throughout the body. The patient is injected with a stanozolol tracer that enters their bloodstream. The tracer essentially rides along with each cell in the body. The pet scan detects the radioactive tracers where the cancer cells absorb the designer tracer approximately 10 times faster and to a much greater degree than healthy cells in the body. 

The Purpose of a Whole-Body PET Scan

A whole-body positron emission tomography-computed tomography (PET-CT) scan utilizes FDG as a radioactive tracer to diagnose the presence of potential multiple abnormalities, including cancer (in various forms), neurological conditions, cardiovascular disease, pyrexia of unknown origin. 

There is so much to say about whole body PET CT Scan? 

The whole body PET CT scan provides structural and functional information regarding your body’s organs and tissues at cellular and molecular levels which is very very informative. The test is administered through the application of an “O” shaped machine. Most hospitals and care facilities currently have this technology and so they are all using it. 

What Patients should know about whole body PET CT Scans 

This is a new technology that involves nuclear imaging. Below are some instructions (Do’s and Don’ts) patients should know before having a PET CT scan done. 

  • Diabetic patients can eat 6 hours before the scan. 
  • Notify the technologist/doctor/radiologist if there is a chance you are pregnant. 
  • Notify the technologist/doctor/radiologist if breast-feeding. 
  • Notify the technologist/doctor/radiologist if allergic to anything. 
  • Notify the technologist/doctor/radiologist if you have had any recent radiation treatments. 
  • If you are insulin dependent, notify the doctor for specific instructions.

Don’t 

Do throw away items with metal such as zips, snaps, jewellery, glasses, dental flippers etc

There is a big difference in health care between discovering illness and disease at the right time. It helps improve life expectancy for a good quality of life. PET CT Scan is quite popular nowadays for early detection of many chronic diseases.It gives you information about nearly all of the body tissue. 

How is the Whole Body PET Scan performed? 

In Whole-body PET CT scan, the radioactive tracer is given to the patient as per the needs of the Food and Drug Administration (FDA). The patient is then asked to avoid any form of strenuous exercise or motion at all and not eat or drink anything after receiving the radioactive tracer. 

Conclusion

Whole Body PET scans are a newer diagnostic tool that has provided unprecedented knowledge of the body’s organs and tissues at the level of cells. Whole Body PET scans are an important way for doctors to discover diseases such as cancer or other heart and neurologic problems, or infections, with timely diagnosing and treatment planning. Early detection of disease improves the patient’s impending death expectancy so results in a better quality of life. It can improve your life on both accounts for both your expectancy for living and your possible quality of life!

Frequently Asked Questions

Q. If the result of my Whole-body PET was abnormal?

There will be some sort of scan abnormality and he will tell you what you have to do next.

Q. What does Full-body PET cost in Delhi?

The cost of a full-body PET CT in Delhi INR 11,950 to INR 23,900.

Q. How to get a whole-body PET scan centre near me in Delhi NCR?

You can look for a whole-body PET CT scan centre near me in Delhi NCR on Google for nearby available centres or take a carebox directly.

Q. Is a whole-body PET test scan superior to an MRI?

A whole-body PET test scan comes in contact with radiation, but MRI has nothing to do with the radiation in the test. However, PET scans can detect abnormalities even at a cellular level which might not be found in the MRI test.

Q.How to find the Whole-body PET test scan center near me in Delhi NCR?

Patients can visit the Whole-body PET scan centre near me in Delhi NCR under the Google search for closest Whole-body PET test scan centres.

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