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Radioactive After Pet Scan
PET/CT scan: You need to fast for 4 hours first, then you will recieve an injection of a small amount of radioactive glucose (i.e. Sugar). Next you will sit in a recliner chair for about 70 minutes to allow the glucose to distribute throughout you. Then you will lie on your back on the pet/ct scanner (a tunnel shaped machine) for 20 minutes. There are no side effects from the test or restrictions afterwards. ...Read moreSee 2 more doctor answers
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
Different mechanisms: Mri uses magnetic radiation( no x-ray) for anatomic localization and characterization of different parts of body, water and fat constitution of different tissues.Ct uses x-ray to characterize anatomy of body, better for bone than mr.Pet, bone, gallium scans use radio tracers intravenously.Petglucose metabolism of tumors, gallium (infection/tumor), bone scan for fxs, tumors, infection bone metabolism. ...Read more
Nsclc st4. Diagnostic CT scans used iodine contrast but due to allergy, post treatment CT scans used barium. How accurate/comparable are the scans?
Both: The actual diagnosis of lymphoma requires tissue, usually excisional biopsy of an entire lymph node. Staging to see where other sites of disease could be is done with a combined PET/CT. The staging used to matter more many years ago when they would often give XRT or do surgery, it doesn't matter as much as it used to because almost everybody gets systemic chemotherapy for both Hodkins and non H ...Read more
After cancer surgery i had 2 clear pet scans.Nw after 5 yrs the pet scan is abnormal. Possible causes?
Not enough info...: It is possible to have an abnormal scan at 5 years but I do not know enough about your history and what was abnormal in this scan. There are many sources of false positive on pet scan but without seeing your images or reports and without your exact history it is difficult to determine what the status is. ...Read more
Quite different: Ct involves xray type radiation with cross sectional imaging in transaxial, sagittal, and coronal projections. Nuclear medicine, internal irradiation either injected intravenously, inhaled, ingested, injected subcutaneously.Ivp uses injection of contrast material for visualization of kidneys and bladder with x-ray. Mr imaging uses no ionizing radiation magnetic fields to generate x-sectional images. ...Read more
Well...: Since you had a cardiac nuclear scan, I assume your doctors were looking for coronary artery disease. You seem to be a smoker, which makes artery disease worse. So smoking is not a good thing for you, and you should try to stop. Having said that, you are probably not in any more immediate risk for heart problem for smoking after the nuclear exam. Long term risks are greater with smoking. ...Read moreSee 2 more doctor answers
Is taking iodine helpful when exposed to radiation via CT scans /multip. X-rays? The japanese took it after bomb and nuclear disaster.
Very safe: Injection of isotope technetium 99m mdp and visualization of skeleton looking for areas of abnormal uptake. Side effects include sometimes some bleeding from injection site. Isotope usually does not cause any allergic reaction. Lie down on table with cameras taking images of skeleton. Relax. ...Read moreSee 1 more doctor answer
No: All imaging tests that expose a patient to radiation should only be performed for certain conditions/symptoms. That is called appropriate use. Medical radiation is a useful tool, but it should not be used unless necessary to help make a diagnosis. Radiology is always trying to balance radiation dose with image quality. This is called alara - as low as reasonably achievable. ...Read moreSee 3 more doctor answers
Not usually: Depends on nuclear study. A lot of CT exams such as chest and abdomen have more radiation dose than most nuclear medicine studies. A bone scan is more dose than the CT of brain. In any event if study is necessary for diagnosis to help patient the dose becomes insignificant. ...Read moreSee 2 more doctor answers
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 moreSee 1 more doctor answer
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 moreSee 2 more doctor answers
So continuous radiation that focuses on thyroid CT scans and radioactive dye from pet scans can't destroy someone's thyroid gland causing it to fail ...Leading to hypothyroid issues ?
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 moreSee 3 more doctor answers
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 moreSee 4 more doctor answers
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
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 moreSee 2 more doctor answers
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 moreSee 2 more doctor answers
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 moreSee 3 more doctor answers
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. A low dose ct is often acquired at the same time as the pet (as in pet/ct scan), to correlate the pet findings with the ct anatomy. ...Read moreSee 2 more doctor answers
Fluorine 18: F18.Get a more detailed answer ›
No..: Not known to....Get a more detailed answer ›
Why PET?: Pet very valuable study to assess metabolic dysfnctn areas in brain due to many causes, and now we can inject newer chemicals to assess both alzheimer's and parkinson's, but really rather un-necessary and expensive test for stroke, as visualization readily available on an mri. ...Read moreSee 1 more doctor answer
significant dose: Whole-body pet/ct scanning accompanied by substantial radiation dose and cancer risk. Examinations should be clinically justified, and measures should . Whole-body pet/ct scanning is accompanied by substantial radiation dose and cancer risk. Reason justified for study (patient with malignancy and treatment for metastatic disease) with attempt at extension of life expectancy and possible cure. ...Read moreSee 1 more doctor answer
Very good test: Pet/ct is used quite often in the initial diagnosis and restaging of many types of lymphoma. Lymphoma consumes glucose at a much higher rate than normal tissues. That makes pet/ct with f-18 fdg, which images glucose metabolism, is a great test for lymphoma. ...Read moreSee 2 more doctor answers
Takes up tracer: Pet scans work by imaging a tracer that is a sugar analogue. Since tissue/cells that are more "metabolically active" take up more glucose tracer, we refer to that as "hypermetabolic". Diagnostically, this can mean a number of things and depends on the context. Inflammatory cells and malignant cells (cancer) are typically hypermetabolic. One would have to look at the context and medical history. ...Read moreSee 2 more doctor answers
GoBackToThePetBox: At your age the thymus is considered a residual organ, kind of like your appendix.Now,there are some theories as to its function later in life (an immune function or whatever),but overall it just sits there.Of course,it's made of living tissue so there will be some"activity"in it & rarely,can develop a tumor or infection.But in your case who knows?The people who ordered the test in the first place ...Read more
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
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 moreSee 2 more doctor answers
Radioactivity refers to the particles which are emitted from nuclei as a result of nuclear instability. Because the nucleus experiences the intense conflict between the two strongest forces in nature, it should not be surprising that there are many nuclear isotopes which are unstable and emit some kind of radiation. The most common types of radiation are called alpha, ...Read more
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