Pet Scan
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Positron emission tomography (PET) is a nuclear medicine imaging technique which produces a three-dimensional image or picture of functional processes in the body. The system detects pairs of gamma rays emitted indirectly by a positron-emitting radionuclide (tracer), which is introduced into the body on a biologically active molecule. Images of tracer concentration in 3-dimensional or 4-dimensional space (the 4th dimension being time) within the body are then reconstructed by computer analysis. In modern scanners, this reconstruction is often accomplished with the aid of a CT X-ray scan performed on the patient during the same session, in the same machine. If the biologically active molecule chosen for PET is FDG, an analogue of glucose, the concentrations of tracer imaged then give tissue metabolic activity, in terms of regional glucose uptake. Although use of this tracer results in the most common type of PET scan, other tracer molecules are used in PET to image the tissue concentration of many other types of molecules of interest. From Wikipedia under the
GNU Free Documentation License Bone and muscle uptake on pet scan What? Q. I have follicular lymphomna stage four and on my last pet scan it set bone and muscle uptake . What does that mean? Asked by sherry@@@ - Sat Mar 28 09:26:28 2009 - - 2 Answers - 0 Comments A. PET scans show metabolic activity. The higher the activity, the brighter they are on the scan. You did not post the full text so it is impossible to know what this is on your PET scan and so I can only give you a general answer: It could be a number of things from inflammation to mets. Answered by Denisedds - Sat Mar 28 18:50:15 2009 When having a PET Scan, is the CT Scan that used in conjunction good enough to diagnose any other non cancer?
Q. Is the Ct used under normal circumstances good enough image to diagnose non cancer problems? Asked by BW - Fri May 30 14:24:11 2008 - - 3 Answers - 0 Comments A. Generally speaking, the CT scan that is performed in conjunction with a PET scan is considered to be "non-diagnostic" for purposes of diagnosing other problems. The purpose of the CT scan is to replace what is referred to as the transmission phase of a PET scan. Except in rare cases, CT for PET is performed with thicker slices and without contrast. A diagnostic CT scan almost always utilizes very thin slices and, depending upon what they are looking for it may or may not be performed with contrast. The interpreting radiologist should review the CT performed with PET to rule out any gross abnormalities. Having said that, there are some conditions that will be revealed even on a CT for PET. Answered by AnonyMous - Fri May 30 18:24:34 2008 From Yahoo Answer Search: "pet scan" |
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