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Doctor insights on: What Isotope Is Used In The Injection For A Pet Scan

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Dr. Guido Davidzon
292 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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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

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Going in for a radioactive iodine uptake scan. How is this administered?

Going in for a radioactive iodine uptake scan. How is this administered?

Usually capsule: Usually liquid in capsule and is ingested by patient with liquid drink. Sometimes some patients can not swallow pills and can be administered in these rare cases, if facility is informed in advance, in liquid form. ...Read more

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What is the dye commonly used for a liver scan?

What is the dye commonly used for a liver scan?

Depends on scan?: There are multiple types of liver imaging available. Ultrasounds don't use any dye. Cat scans use iodinated dyes. Mri scans use gadolinium based dye. ...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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When is a CT scan of the neck used?

When is a CT scan of the neck used?

Good test: Can look at bones for fracture if you had trauma. Can do cta neck to look at blood vessels if you have carotid artery disease. Can look at tissues to see if there is a cancer or infection. These are a very few examples of the uses of ct. See radiologyinfo.Org. ...Read more

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What is a cat scan of the brain used for?

What is a cat scan of the brain used for?

Fast brain study: Cat scanning is used often to check for acute brain problems such as tumors, bleeding, skull fractures, sinus infections, looking for larger obvious pathology to make a rapid determination of the need for immediate intervention, and provides better views of bone and sinuses than MRI (which is better to see strokes or ms lesions). ...Read more

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What is the difference between an MRI and a cat scan? Except for the radiation factor.

What is the difference between an MRI and  a cat scan? Except for the radiation factor.

Physics: The physical phenomena on which these imaging techniques are built are very different, each is best suited for different purposes. Cat scans are sophisticated x ray, they rely on the degree of absorption of gamma rays (bones, ca, other metals will contrast most). Mri is better for softer tissue imaging because it depends more on the behavior of hydrogen atoms and h2o in the strong magnetic field. ...Read more

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For a bone scan what is the purpose of doing some scans before/during the injection of the tracer? I thought that the scans were after it was absorbed

For a bone scan what is the purpose of doing some scans before/during the injection of the tracer? I thought that the scans were after it was absorbed

Easy imaging...: It sounds like you are referring to a three phase bone scan (flow, blood pool, and delayed images). Early images can provide more information depending on what your condition is. Early images are helpful to look for osteomyelitis, RSD, and some other conditions and can help determine if a condition is acute or chronic. ...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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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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Hello docs, is a gallium scan the same as a bone scan?

Hello docs, is a gallium scan the same as a bone scan?

No: Gallium scanning involves greater irradiation and is non specific for tumor, infection , and bone abnormalities. Low radiation bone scan is specifically for osseous problems such as fractures, metastatic disease to bone, avascular necrosis, some metabolic bone issues, etc.Patient with unknown source of fever or pain and multifocal disease usually helped by bone scan. ...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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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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Dr. Eric Wang Dr. Wang
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What is the difference in diagnostics between mri, cat scan and colonoscopy? Which one is best for identifying problems?

Dr. Eric Wang Dr. Wang
5 doctors agreed:
What is the difference in diagnostics between mri, cat scan and colonoscopy?  Which one is best for identifying problems?

Depends: Mri and ct scans are noninvasive imaging techniques. They have their own inherent advantages and disadvantages, and to compare them would be too complicated here. Colonoscopy is invasive, where a camera is extended via the rectum into the colon to see what the inside of the colon looks like, usually for cancer screening. ...Read more

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For the last image in a CT scan they injected me with some kind of contrast what was it.?

For the last image in a CT scan they injected me with some kind of contrast what was it.?

IV contrast. : IV contrast fills blood vessels and helps to identify vascular structures, differentiating them from non-vascular structures. ...Read more

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What is the radiation dose of a CBCT scan (taken for root canal) and what is it equivalent to in natural radiation?

Here's some info...: http://www.dent.umich.edu/patients/cbct-imaging-service-frequently-asked-questions I'm sure there's plenty more out there. Regarding natural radiation, you are comparing full body exposure to exposure of just the jaw, so it is hard to compare. ...Read more

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When is contrast needed for a CT scan of neck?

Contrast: Needed to look for cancer or infection and to see extent of penetrating trauma. Cta uses dye yo look at vessels in more detail. ...Read more

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