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Doctor insights on: Is The Positron Emission Tomography Scan A Risky Thing To Do

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Is the positron emission tomography scan a risky thing to do?

Is the positron emission tomography scan a risky thing to do?

No: It' just a diagnostic dose of radiation, like having a ct scan. (if someone thinks you need a pet scan which is a specialized test and expensive) it's probably safer for you to have it than to go without it.). ...Read more

Tomography (Definition)

Old fashioned tomograms used a moving x-ray source and flat detector to image at a certain depth in a patient. Most commonly this was used to image the kidneys. The most common tomograms used today are in cat scans, or computer assisted tomography. An x-ray source and multiple detectors spin around you, and the data is reconstructed by a computer into a slices, or ...Read more


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Is the magnetic resonance cholangiopancreatography a risky thing to do?

Is the magnetic resonance cholangiopancreatography a risky thing to do?

No: Mrcp is a safe procedure that involves exposure to a powerful magnetic field, . As long as you do not a heart pacemaker, aneurysm surgical clips in the brain, spinal stimulator devices, or any other reason why going into a MRI machine is unsafe for you, then you will be safe. ...Read more

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Is the lumbar CT scan with dye a risky thing to do?

Is the lumbar CT scan with dye a risky thing to do?

Not too Risky: The biggest risk would be an allergy to the dye. It is rare, centers knows the cross allergies, that is, red flags about people who are increased risk for an allergic reaction. Centers are also prepared to take appropriate in case there is an allergic reaction. There is also the risk from the radiation associated with the ct. ...Read more

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What is the best mri/mra test (model) to rule out brain aneurysm in men and is it done with (gadolinium) contrast?

What is the best mri/mra test (model) to rule out brain aneurysm in men and is it done with (gadolinium) contrast?

Any: Any mri/mra can be used for aneurysm detection. Current mris are powerful enough to detect even small aneurysms. Gadolinium contrast (if no contraindications) is a plus since it can improve picture quality. ...Read more

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Is there something they will give me for anxiety when i'm doing the positron emission tomography scan?

Is there something they will give me for anxiety when i'm doing the positron emission tomography scan?

Maybe: Taking a pet study is easy and painless. You will get an injection of a radioactive substance (glucose) and relax in a calm quiet area. Then the technologists will have you lay on a motorized table and you slowly are moved through two large open tubes that scan you. You won't feel anything otherwise and can keep your eyes open or closed. A relaxing medicine can be given if absolutely necessary. ...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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What is a pet CT scan used for?

What is a pet CT scan used for?

Several uses: In most cases PET CT scan is used for detecting metatases in the body. It can also be used for brain with mets, primary tumors, and epilepsy. Injection of glucose metabolite F18 FDG goes to malignant lesions that are highly metabolic,. Usually more sensitive for detecting smaller lesions. Used in staging malignancies and following patient's response to chemotherapy and radiation ...Read more

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What is risk in regards to computed tomography?

Small: Xrays small risk of cancer. Contrast small risk of reaction or renal damage. Go to acr accredited scanner to be safe. See radiologyinfo.Org. ...Read more

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What is the difference between nuclear medicine radiation and ct/x-ray? Is it true that the only radiation you receive in nuclear medicine is the radioactive tracer that is administered into your vein? If so, does this radiation not accumulate as ct/x ray

What is the difference between nuclear medicine radiation and ct/x-ray? Is it true that the only radiation you receive in nuclear medicine is the radioactive tracer that is administered into your vein? If so, does this radiation not accumulate as ct/x ray

Yes.: In nuclear medicine a radioactive "tracer" (e.g. Technetium) is injected into a vein and the gamma rays are emitted from the body and detected by a gamma camera placed against the body to create an image. The radioactivity decays over time and is also excreted from the body. With ct, the x-rays are passed through the body from an xray tube to create an image and do not reside in the body. ...Read more

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How common is it for someone to need a helical computed tomography?

Very Common Test: 'helical computed tomography' -- a cat scan -- is an immensely valuable test for evaluating diseases of every part of the body. Scanners are widely available, both in hospitals and in outpatient centers, and the images obtained provide valuable insight into many diseases. ...Read more

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Is the cervical spine CT without dye a risky thing to do?

Is the cervical spine CT without dye a risky thing to do?

No: Theris xray exposure other than that it causes no other problems i wouldn't call it risky. ...Read more

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When having a pet scan, is the CT scan that used in conjunction good enough to diagnose all tumors?

When having a pet scan, is the CT scan that used in conjunction good enough to diagnose all tumors?

Good but not all: It is good to have ct in conjunction with pet scan because ct provides more resolution. It helps the radiologist correlate signals seen on pet scan with actual anatomy precisely. However, no test is perfect, so pet/ct is not able to diagnose all tumors. But pet/ct can diagnose many types. ...Read more

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Heard pet scan expose equal radiation as ct.What will be the radiation for pet +ct which are using nowadays combined?Is it double the CT radiation?!

Heard pet scan expose equal radiation as ct.What will be the radiation for pet +ct which are using nowadays combined?Is it double the CT radiation?!

Variable: The exact radiation you get from ct and pet/cts varies based on the used protocol. Roughly speaking a diagnostic ct gives you a rad dose of 10-15 msv. Pet/cts are often done with low-dose ct, so instead of 10-15 msv you get 1-2 msv from the ct. For the pet portion is approximately 8-12 msv. So a regular pet/ct is approx 12-14 msv and if you add a diagnostic ct you get 10-15 msv more. ...Read more

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Is the lumbar MRI with dye a risky thing to do?

Is the lumbar MRI with dye a risky thing to do?

No: If you have any allergies to dye or shellfish, you may have an allergic reaction to the dye. Otherwise, there is no risk in this procedure. ...Read more

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What is a pet scan? What is a pet scan and how is it different from other breast imaging procedures?

What is a pet scan? What is a pet scan and how is it different from other breast imaging procedures?

Anatomy vs Physiolog: Mri and ct look at the structure of the body, the anatomy, and the way diseases change or distort it. Pet looks at the physiology, or how the body uses, or metabolizes something. For pet, the most common metabolism pathway looked at is how glucose is used. Ct is used to correlate anatomy to the pet pet images the whole body, while mri, us and mammography are limited to a portion of the body. ...Read more

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Is the abdominal pelvic CT scan with dye a risky thing to do?

Is the abdominal pelvic CT scan with dye a risky thing to do?

CT abdomen/pelvis: This test is a common routine imaging procedure, essentially a fancy 3d x-ray. While there is more radiation than an x-ray, if you are having symptoms that warrant this examination there is nothing to worry about. Having multiple ct examinations because of the repeated radiation can be worrisome. ...Read more

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What is a CT scan (brain) used for?

See the brain, skull: While xrays show the bones, a ct is sensitive enough to see the brain and its structures. Ct is vers useful to see blood, abnormal fluid collections, masses, areas of old or subacute stroke. The skull, sinuses, scalp and facial bones, eyes, mouth are also seen. Mri is even more sensitive for visualization of the brain and other soft tissue structures and may be required if the ct is positive. ...Read more

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What is the risk for cancer from single head CT scan if CT scan is done on baby?

What is the risk for cancer from single head CT scan if CT scan is done on baby?

Probably less than1%: First, benefits must outweigh risks when a ct is considered for a baby. Low dose rt from imaging is very relevant in current news. Ct head prob gave <10 to 50 mgy with then cancer induction risks estimated to be <1%. ...Read more

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Ct scan dects brain aneurysms? Is it possible for a CT scan without contrast to reveal an unruptured brain aneurysm? Is the test meant to find that sort of thing?

Ct scan dects brain aneurysms? Is it possible for a CT scan without contrast to reveal an unruptured brain aneurysm? Is the test meant to find that sort of thing?

NOT THE BEST WAY: Mri with contrast will pickup most large aneurysms over the blood vessels of the brain, and a cat angio or a magnetic resonance angio would be used to find smaller aneurysms. Standard cat not usually successful. ...Read more

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Which test exposes patients to more radiation? Is it PET scan or CT scan?

Which test exposes patients to more radiation? Is it PET scan or CT scan?

It depends: on the technical parameters of the scans, particularly the CT scan. The exposure from the CT scan could potentially be more, about the same, or lass than a PET scan. ...Read more

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Is the positron emission tomography scan a risky thing to do?

No: It' just a diagnostic dose of radiation, like having a ct scan. (if someone thinks you need a pet scan which is a specialized test and expensive) it's probably safer for you to have it than to go without it.). ...Read more

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Is there something they will give me for anxiety when i'm doing the positron emission tomography scan?

Maybe: Taking a pet study is easy and painless. You will get an injection of a radioactive substance (glucose) and relax in a calm quiet area. Then the technologists will have you lay on a motorized table and you slowly are moved through two large open tubes that scan you. You won't feel anything otherwise and can keep your eyes open or closed. A relaxing medicine can be given if absolutely necessary. ...Read more

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Is there any pain involved in a positron emission tomography scan?

IV "stick": This is painless though you may feel the pain of an IV as it si stuck into you during the test. The dye is not typically allergic and no pain is involved. Some patients feel claustrophobic. ...Read more

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What would a neurologist refer patients for positron emission tomography scans for?

What would a neurologist refer patients for positron emission tomography scans for?

Pet indications: Pet is good to show in vivo abnormal functional areas--it has limitations--it would be nice if cheaper, more available and the pictures come superimposed on MRI pictures---may benefit us in dementia--separate radiation necrosis from active brain tumour--separate infectious from degenerative area. ...Read more

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What is the definition or description of: positron emission tomography?

A nuclear medicine s: A specialized nuclear medicine study usually performed to evaluate the presence of cancer. ...Read more

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Is a spiral (helical) computerized tomography CT of the chest the same thing as a high-resolution CT scan?

No: Essentially all ct now is spiral. High resolution ct of the chest is a special exam to evaluate the lung tissue using very fine slices and special image manipulation to see fine detail in the tubes and air sacs of the lung. ...Read more

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What is the use of spect (single-photon emission computed tomography) in nuclear medicine?

Multiple : Spect is a modality of nuclear medicine imaging that allows for 3d imaging, therefore better for diagnostic purposes. Uses include scans of the bones, lungs, heart. ...Read more

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I had a head computer assisted tomography scan and want to know if radiation used?

I had a head computer assisted tomography scan and want to know if radiation used?

Yes: It is true that ionizing radiation (x-rays) are used but the dose for a single ct of the head is low and should not have any effects. ...Read more

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Why not perform full body computerized axial tomography scans on everyone with major diseases?

Poor use of resource: In addition to the risk of radiation exposure, cost, and inefficient use of healthcare resources, it often reveals incidental findings that have no impact on patient's health and triggers additional testing. ...Read more

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What are advantages of MRT (Magnetic Resonance Tomography) scan over MRI (Magnetic Resonance Imaging) scan? Are these equally safe?

Same: Those are equivalent terms for the same type of imaging. No x-rays or iodine containing contrast is used for MRI studies. Here is a helpful link. http://www.mr-tip.com/serv1.php?type=db1&dbs=Magnetic%20Resonance%20Tomography ...Read more

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What exposes the body to more: radiation bone scan or computed tomography?

What exposes the body to more: radiation bone scan or computed tomography?

CT vs bone scan: The amount of CT radiation exposure depends on the type of CT. Average effective radiation dose for bone scan is about 6 mSv. Dose for head CT is 2mSv, for abdomen CT is 8 mSv, and for CT angiogram 16mSv. ...Read more

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Which exposes the body to more radiation bone scan or computed tomography?

Which exposes the body to more radiation bone scan or computed tomography?

Sometimes same dose: Background radiation at sea level: 3 msv per year, denver residents get: 6 msv per year, cross country flight: 0.02 msv, x ray chest: 0.06 msv, ct head: 3 msv, ct chest: 5 msv (equivalent to 100 chest xrays) ct abdomen: 5-10, average bone scan 6.5 msv. Radiation depends on size of patient." radiation affects growing body in children more than adults. Doses to children are much less. ...Read more

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Which procedure exposes patients to more radiation: a bone scan or a computed tomography?

Which procedure exposes patients to more radiation: a bone scan or a computed tomography?

Sometimes same dose: Background radiation at sea level: 3 msv per year, denver residents get: 6 msv per year, cross country flight: 0.02 msv, x ray chest: 0.06 msv, ct head: 3 msv, ct chest: 5 msv (equivalent to 100 chest xrays) ct abdomen: 5-10, average bone scan 6.5 msv. Radiation depends on size of patient." radiation affects growing body in children more than adults. Doses to children are much less. ...Read more

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Expert opinions? Which modality exposes patient generally to more radiation, bone scan or computed tomography?

Expert opinions? Which modality exposes patient generally to more radiation, bone scan or computed tomography?

Sometimes same dose: Background radiation at sea level: 3 msv per year, denver residents get: 6 msv per year, cross country flight: 0.02 msv, x ray chest: 0.06 msv, ct head: 3 msv, ct chest: 5 msv (equivalent to 100 chest xrays) ct abdomen: 5-10, average bone scan 6.5 msv. Radiation depends on size of patient." radiation affects growing body in children more than adults. Doses to children are much less. ...Read more

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A computed tomography scan that uses iodinated contrast A magnetic resonance scan that uses a gadolinium contrast agent causes me short of breath help i cant breath when i try to hold my breath on scanner even with the cannula i cant breath need mask?

A computed tomography scan that uses iodinated contrast A magnetic resonance scan that uses a gadolinium contrast agent causes me short of breath help i cant breath when i try to hold my breath on scanner even with the cannula i cant breath need mask?

Need more info: I have administered thousands of CT and MR contrast doses over 30 yrs. and breathlessness as described doesn't fit a contrast prob. Did you tolerate non contrast studies while in the machines?
Was your pulse racing when you were breathless? If so, could this be claustrophobia? I trust breath holding is not a prob. out of the scanner.
May try behavior modification techs. or hypnosis. Poss. pre-meds ...Read more

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What is a computed tomography of abdomen pelvis urinary stone protocol mean? same as a CT scan scared as this would be my 2cnd ct scan within 3 years

It means: that the technical parameters of the scan are tailored to maximize the ability to detect stones. Contrast is not administered. The theoretical radiation risk from 2 CT scans is extremely minimal, but you can calculate it, and put it into perspective, at xrayrisk.com ...Read more

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What is the definition or description of: computerized axial tomography?

CT scan: Axial sections are obtained perpendicular to the long axis of the body -- like slicing a loaf of bread. Ct, or computerized tomography does this non-invasively with x-rays and a method called filtered back projection. In other words, the x-rays are measured on the way out of your body, and the different measurements are used to create pictures of your body and internal organs. ...Read more

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Dr. Lori Semel
3 doctors shared insights

Herring Antibody Test (Definition)

Testing for ige antibodies may be useful to establish the diagnosis of an allergic disease and to define the allergens responsible for eliciting signs and symptoms. Testing also may be useful to identify allergens which may be responsible for allergic disease and/or anaphylactic episode, to confirm sensitization to particular allergens ...Read more


Positron Emission Tomography (Definition)

A specialized nuclear medicine study usually performed to evaluate ...Read more