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Doctor insights on: How Does Metal Affect The Results Of A Pet Scan

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How does metal affect the results of a pet scan?

How does metal affect the results of a pet scan?

Usually not much: Metal can block the gamma rays that are emitted by the patient, and block the xrays from the ct portion of the pet/ct, which can create errors on one portion of the exam (called the attenuation corrected scan).

However, the original pet data from the scan (uncorrected) is always available for review, so if the standard images have artifact on them, the uncorrected images can be reviewed. ...Read more

Dr. Guido Davidzon
291 Doctors shared insights

Pet Scan (Definition)

Pet scans most often use a radioactive form of glucose, the energy source for most of the cells in our bodies. The pet scanner can detect and measure how much of the radioactive glucose analog, f-18 fdg, is in a particular organ or region. The areas using more glucose are hyper metabolic and generally more worrisome. Our brains and sometimes hearts prefer glucose as food, making ...Read more


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Could you tell me what this print out of a pet scan results means?

Could you tell me what this print out of a pet scan results means?

Discuss with doctor.: It is best to discuss your pet scan results with your physician so that you can be sure that you have a detailed and correct understanding of the scenario. If you have any specific questions, be sure to have them clarified. Without the results, it is difficult to answer your question. Hope this helps. ...Read more

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How do pet scans work? My wife is scheduled for a pet scan and I was wondering how it works. Is this a good test relative to the other kinds of tests you can do? Is it accurate? Do you know how long it usually takes to get the results back?

How do pet scans work? My wife is scheduled for a pet scan and I was wondering how it works. Is this a good test relative to the other kinds of tests you can do? Is it accurate? Do you know how long it usually takes to get the results back?

Positrons -Really!!: A pet/ct looks at the function of the body. Radioactive drugs (usually a glucose analog) distribute based on differences in function, release a positron (antimatter), which is destroyed by combining with an electron, making an x-ray we detect.

Follow the directions the imaging center gives exactly, because patient prep is critical to getting the best test.

Pet/cts are usually read the same day. ...Read more

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Pet scan results were fine so why do they want me to have a bronchial scope done? Wouldn't the scan have shown any spread to the lymph nodes already?

Pet scan results were fine so why do they want me to have a bronchial scope done? Wouldn't the scan have shown any spread to the lymph nodes already?

Not necessarily: Pet scans can prevent lymph node biopsies when they are positive, but when staging disease a negative "scan" does not exclude metastasis (particularly if lung cancer metastasis is the question). ...Read more

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What will happen to my pet scan result if I cannot keep myself warm before the exam?

What will happen to my pet scan result if I cannot keep myself warm before the exam?

Don't worry: Tell the pet scan attendants how cold you are and they will provide you with blankets. Most radiology centers try to make the exam experience as pleasant as possible. ...Read more

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Which is better, pet scan or cisternogram? Father already had a cisternogram results borderline positive. Should pet scan be done or repeat cisterno

Different tests: Cisternography is used to determine if there is normal pressure hydrocephalus. It looks at the flow of CSF fluid.

Pet scans are for looking at the brain cells and associated pathology. ...Read more

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PET scan to investigate a Right Hilar enlarged lymph node1.4cmX.9cm Results: residual thymic tissue mild activity SUV 1.5. This normal? I reCT in 4mo

PET scan to investigate a Right Hilar enlarged lymph node1.4cmX.9cm Results: residual thymic tissue mild activity SUV 1.5. This normal? I reCT in 4mo

Possibly: SUV of 1.5 is normal to maybe reactive. This makes it very unlikely to be worrisome. The follow up CT should be improved or no change ...Read more

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Stress test on 7-10-2015. I went today for the results. They said the scans were normal and no blockages. The DR wants me to do PET scan now because even though the results were normal my BP was 150/100 right before and 120/80 after. Is that normal?

Stress test on 7-10-2015. I went today for the results. They said the scans were normal and no blockages. The DR wants me to do PET scan now because even though the results were normal my BP was 150/100 right before and 120/80 after. Is that normal?

Talk w/ your doctor: A PET scan of the heart is a non-invasive imaging test that uses radioactive tracers to produce pictures of your heart. These images can help Dx heart disease or clarify areas of concern that may not have been completely seen on your EKG stress test. Talk with your doctor. Express your question with the desire to know why the test was ordered and how the result will affect mgmt of your health. ...Read more

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Oncology: How long after a Whipple operation can a patient still have a slightly annoying pain as a result of inflammation as seen on a PET scan?

Oncology: How long after a Whipple operation can a patient still have a slightly annoying pain as a result of inflammation as seen on a PET scan?

Weeks: Since the Whipple requires several anastomosis, there is the potential for slight and temporary leaks. These areas should be drained at the time of surgery and include suturing the common duct to small bowel, and implanting the transected body of pancreas into jejunum. These sites are well known to cause, even with good drainage, temporary leakage setting up inflammation seen on scan. ...Read more

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Before start of stress test bp was 150/100 (not usually so high) After treadmill bp 120/80. Results show no blockages, now want pet scan to re test?

Before start of stress test bp was 150/100 (not usually so high) After treadmill bp 120/80. Results show no blockages, now want pet scan to re test?

It's precaution.: An elevated blood pressure is always a concern as it can cause heart to become stiff. Although your pressure became normal afterwards but the fact that it was high in the beginning means that you have a high stress and your heart reacts to that. ...Read more

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What can a Heart PET Scan diagnos? If it is Abnormal result, what is the outcome needed procedure or treatment plan?

Heart perfusion: A heart PET scan evaluates the blood flow to the heart. It can also detect prior damage and give information on the overall function of the heart. This test is not widely used in cardiac evaluations, thus addressing an abnormality on the scan would depend on why your doctor recommended the scan for you. ...Read more

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Post op seminoma, in r testicle. Pet scan done for suspecious nodes. Pet scan result shows negative for any abnormalility. This means no seminoma?

Post op seminoma, in r testicle. Pet scan done for suspecious nodes. Pet scan result shows negative for any abnormalility. This means no seminoma?

Surveillance: A negative pet scan means there is no accumulation of cancer cells large enough to be discernible by the pet scanner. There is a resolution limit of about 7mm in size to be seen, some are better now. I am not trying to scare you, but your doctor I'm sure will continue to caution you and continue surveillance for a period of time safe to say you are cancer-free. ...Read more

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What could cause a reduced glucose metabolism in a PET scan? That was my result. It was done bcause I have 30 inactive cns lesions and anxiety for years

What could cause a reduced glucose metabolism in a PET scan? That was my result. It was done bcause I have 30 inactive cns lesions and anxiety for years

Brain injury.: Reduced glucose metabolism is caused by poorly functioning or dead brain tissue due to any type of injury or insult, such as stroke, MS, brain injury...... the brain is very resiliant and other parts of the brain take over for parts of the brain that are injured. Specially in the younger pateints. I have a boy who literally lost 1/2 of his brain due to a nearly lethal brain injury, fully recove ...Read more

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Hi, if pet scan results for pancreatic cancer are negative after treatment is this mean that the patient was recovered completely?

Hi, if pet scan results for pancreatic cancer are negative after treatment is this mean that the patient was recovered completely?

No: The medical definition of a cure is usually no cancer present for 5 years after the end of treatment. PET scans can miss small tumors and can also give a falsely negative results for other reasons. That being said, it is a positive sign, better chance of a cure than if cancer were still present, obviously. ...Read more

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Interventional Radiology: About how long after an IRE for cancerous tumor til a CT/PET scan is done to ascertain the results?

Interventional Radiology: About how long after an IRE for cancerous tumor til a CT/PET scan is done to ascertain the results?

What is IRE?: It is best to avoid abbreviations...they can only delay interpretation of what is wrong and where it is!
As for your answer to your question... your oncologist is in a better position to address them than an interventional radiologist. ...Read more

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Can there be a difference in a CT and pet scan of 1mm in the results of a lung nodule?

Can there be a difference in a CT and pet scan of 1mm in the results of a lung nodule?

Yes: There are differences in techniques between the ct scan with a pet scan and a general ct scan. Additionally, radiologists may measure a nodule slightly differently.

Please look at a ruler and realize just how small 1 mm is. Radiologists routinely are measuring things less than 1 cm or about 3/8 of an inch. ...Read more

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My ct-cat-pet scans reveal unclear results, acc to my drs. After my sigmoid colon was removed 'coz of a tumor. Yet I am taking xeloda500m. Justified?

My ct-cat-pet scans reveal unclear results, acc to my drs. After my sigmoid colon was removed 'coz of a tumor. Yet I am taking xeloda500m. Justified?

Can"t tell: Not enough clinical information.
When was colonic resection? Any other areas of cancer? What other therapies have you had? Etc.? ...Read more

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back in may I had a nuclear stress test results could not determine if the image was a breast artifact or something else and a PET scan was warranted. In other testing he had done the same day ischemia was found. When went for follow-up he said I did

back in may I had a nuclear stress test results could not determine if the image was a breast artifact or something else and a PET scan was warranted. In other testing he had done the same day ischemia was found. When went for follow-up he said I did

SPECT vs. PET: On regular myocardial perfusion SPECT imaging, large breasts and large body habitus can cause attenuation artifacts. This is often avoided on cardiac PET where attenuation correction is used. If the breast shifts between stress and rest SPECT imaging, false positive for ischemia could occur. ...Read more

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Can you explain results of chest X-ray led 2 cat scan, which led 2 pet scan. Results are multiple nodules. What causes lung nodules?

Can you explain results of chest X-ray led 2 cat scan, which led 2 pet scan. Results are multiple nodules. What causes lung nodules?

Multiple: There are many causes for pulmonary nodules, which can be broken down into benign or malignant. There are a large number of causes for benign nodules, and 95% of nodules seen on CT scan are benign. If the nodule is large enough, a biopsy may be recommended. The initial move is to see if the same mass was present on a previous scan. PET scans are used to add information, but should not be done firs ...Read more

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Got results for PET scan on lung nodules. Nodules are "undetermined" cuz of size but parotid glands on both side of neck showed "hot". Any relation?

Got results for PET scan on lung nodules. Nodules are "undetermined" cuz of size but parotid glands on both side of neck showed "hot". Any relation?

No relation: Parotid glands can have chronic inflammation which will show up on a PET scan just like tumors do. But it is unlikely to be anything significant that should worry you. You can ignore it for the time being. ...Read more

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What is a pet scan?

What is a pet scan?

NUCLEAR CT SCAN: Pet scan is one type of nuclear ct scan (other type is called spect scan) that uses gamma rays as opposed to x-rays used in conventional or standard ct scan. ...Read more

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What can a pet scan show?

What can a pet scan show?

What is the question: Currently pet scans are widely use for evaluation of glucose metabolism in the body.
In oncology, is use to for initial metabolic characterization of tumors, metastases as well as for treatment response and surveillance. In cardiology, pet scans are use to assess heart ischemia and viability and in neurology the study is use to evaluate cognitive disorders, epilepsy and brain tumors ...Read more

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What is suv on a pet scan?

What is suv on a pet scan?

StandardUptakeValue: Suv simply stands for standard uptake value of a certain area on a scan (lesion, lymph node, etc). This is typically used to standardize pet scans between institutions and physicians. Studies show that maximum suvs of certain lesions are more indicative of cancer. This takes out some of the subjectiveness of reading the studies because by looking at this value, one can decide if it is high or low. ...Read more

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Are suv on pet scan gamma?

Are suv on pet scan gamma?

SUV...: Suv stands for standardized uptake value. It is used for semi-quantitative analysis on pet scan. It tells the amount of glucose uptake or hypermetabolism of a tumor. ...Read more

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What is a pet scan used for?

What is a pet scan used for?

Approved for cancer: Pet scan are approved for staging, response assessment and surveillance of certain types of cancers. However, any pathologic process that augments the consumption of glucose (such as infection or inflammation) can be evaluated, though these indications are not currently covered. In addition, pet scans are used to evaluate for brain cognitive disorder, heart ischemia and myocardial viability. ...Read more

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How is a pet scan conducted?

How is a pet scan conducted?

Much like a CT: Pet/ct is a scanner which looks a lot like a ct scanner.

However, pet scans most often use a radioactive form of glucose, the energy source for most of the cells in our bodies. The pet scanner can detect and measure how much of the radioactive glucose analog, f-18 fdg, is in a particular organ or region.

The areas using more glucose are hyper metabolic and generally more concerning. ...Read more

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Why do people get a pet scan?

PETs...: Pet scans can be used for a variety of purposes depending on the specific radiotracer used. Most commonly, pets are done with FDG (glucose) for oncologic reasons. Other uses of pet include cardiac pet (viability and perfusion studies) or neurologic pet (for seizure focus mapping or dementia). ...Read more

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What is pet scan of the heartbfor?

Blood Flow: A pet/ct with n13 ammonia allows evaluation of the flow of blood in the cardiac vessels, and is useful in determining if a patient would benefit from a more invasive test, called a cardiac angiogram, to better view suspected vessel narrowings (called stenoses) and possibly treat them with angioplasty and stenting. ...Read more

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Can a PET scan cause an increase in?

Can a PET scan cause an increase in?

What is the question: Your question is incomplete. Can you please resubmit so that we can answer it ...Read more

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What are the limitations of a pet scan?

What are the limitations of a pet scan?

Tricky: Not all cancers are hypermetabolic on pet scans and not all hypermetabolic activity in a pet scan is cancer. Inflammation/infection can also show hypermetabolic activity. Pet scans are performed in conjugation with ct (pet/ct) and though pet is great for detecting metabolism (high sensitivity), its specificity is not as great and also has poor anatomic resolution. Reading a pet requires care/skil. ...Read more

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How much pet scan is useful for my son?

How much pet scan is useful for my son?

More info: It would depend on what disease was being looked for. Pet/ct looks at function, while MRI and ct look at the anatomy primarily. ...Read more

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What does an abnormal pet scan look like?

What does an abnormal pet scan look like?

Increased activity: Where it shouldn't be. All organ systems have some metabolic activity, but active organs, such as the heart, kidneys and brain are normally very active. However, the bones, lungs and muscle are not. Various color schemes can be used to detect abnormal uptake. The yellow orange areas show metastatic disease in the liver and bone. ...Read more

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What number of times pet scan in whole life?

As many as needed: Nobody gets a PET scan for no reason. Your doctor must be ordering it for a very good reason, it is expensive. If your doctor thinks that you have cancer or other problems that only PET can diagnose, then you need to have the PET> ...Read more

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Is it possible for pet scans to make a mistake?

Is it possible for pet scans to make a mistake?

Yes: Yes. As with all tests there can be some false positives and false negatives. If you think there may be a mistake you can always get a second opinion. ...Read more

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What are pet scans? What exactly is a pet scan?

Positron Emission: These studies are done by injecting a special "dye" that is attached to a specific molecule. Most of the pet today is done using FDG (a glucose/sugar look-a-like molecule). Wherever this molecule is used/concentrated, the pet scan is brighter. Hence, tumors/infections (which use a lot of energy/sugar/fdg) are bright on such studies. More: http://en. Wikipedia. Org/wiki/positron_emission_tomography. ...Read more

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Does anybody know what an abnormal pet scan is?

Does anybody know what an abnormal pet scan is?

Yes: But I cannot give you the answer without knowing why the scan was performed.
An abnormal scan most likely is because there is an area in your body that is more metabolically active, than expected.
But pet scans are done as pet/ct scans and abnormality could be in the ct part. ..Which could be anything. ..Anatomically not "normal". These ct findings could be "normal" for you but not me. Ask ur md. ...Read more

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Can someone be with me while I have a pet scan?

Can someone be with me while I have a pet scan?

Probably: I would not recommend a child or pregnant woman be the companion. The amount of radiation dose is minimal to caretaker as long as has usual distance of 3.5 feet from patient. Study involves injection of isotope and sitting in quiet room for about 45 minutes. Then pet ct scan performed possibly for another half hour. Typical dose would be about 0.13 msv. Round-trip flight from new york to tokyo 0.13msv. ...Read more

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What chemical is in the injection for pet scans?

What chemical is in the injection for pet scans?

F18-FDG: Different pet tracers exist for positron emitting scans (pet) scans. The most widely used for oncologic purpose is f18-fdg (fluorine-18-fludeoxyglucose) which is a modified glucose (fdg) attached to a radionuclide (f18) that emits gamma photons of 511 kev (energy) and has a physical half-life of 110 minutes. ...Read more