Doctor insights on:
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
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
Fluorine 18: F18.Get a more detailed answer ›
Low Risk - Headache:
Florbetapir f18 (trade name amyvid) is a new pet imaging agent that helps to diagnose alzheimer's disease.
From the clinical trials, side effects (also called adverse reactions) were quite unusual, with no serious ones. The most common side effect was headache, occurring in 1.8% of the patients. Next was musculoskeletal pain (0.8%), followed by nausea and fatigue (each at 0.6%). ...Read more
Getting my first pet scan, will I get sick or nauseous from the radioactive medication/injection that I will receive?
Rarely: Becoming ill as a result of the radioactive injection (18-fdg) for a pet scan is extremely rare (i.e. It almost never occurs). However, *if* you are also having a ct scan *with contrast* at the time of your pet scan, this may make you feel warm or unusual during injection, and can rarely result in allergic reactions. If you have has such a reaction in the past, you should let the staff know! ...Read more
Pet scan and 2 injections of thyroglobulin and I'm still breastfeeding how can I stop? My son is 19mns he doesn't need it just wants it
Weaning: It is always hard to wean a child if they are breastfeeding for comfort, but the best thing to do is explain to him in simple terms that he is a big boy now, and be consistent- do not say yes one day and no the next. Cold turkey. He will cry but he will get over it. Buy him a little present for being a big boy-. ...Read more
Will prolotherapy (including dextrose injections into my knee and lower back) a week before my PET scan affect the PET scan?
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
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
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
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
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
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
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
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
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
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
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
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
Eyes to thighs: Even though the study is called whole body pet/ct, most often the image acquisition is from the eyes to thighs. The parts of the body that are included varies from center to center and also depends on the patient's symptoms and cancer histopathology. For e.g. Melanomas can metastasize anywhere in the body and thus real whole body scans are obtained (skull vertex to toes). ...Read more
Depends: Depends on what you are looking for. PET scan usually uses a glucose based tracer to evaluate metabolic activity which can be increased in tumors. All modalities have a certain rate of false positives and negatives. Sometimes multiple modalities can each give you different information to obtain a complete evaluation. ...Read more
Physiology of lesion: 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 it hard to see. ...Read more
SUV: Roughly....Mild uptake is usually SUV 1 - 3, Moderate 3-5, and Intense 6+ ...Read more
Depends: Radiation received from pet ct is relatively high compared to other imaging tests. Pet ct is mainly used for demonstrating metastatic disease, making decisions about effect of therapy, and looking for recurrence. Pet ct has helped prolong life because it can detect small lesions not seen by other tests. Wise decision should be made judging radiation risk versus positive benefit to the patient. ...Read more
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