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Anatomy and Technology M.R.I P.E.T. Scan CT Scan *Underlined Points is material you'll need to discuss on Test. Anatomy Standards: NSTA – Science and Technology P.E.T. Scan – Positron Emission Tomography -Use Radioisotopes* to detect cellular function of tissues. Commonly used is “Tagged” glucose I.V ...levels of glucose use (health) in study tissue can be detected by amount of radiation emitted. -Soft Tissue Targets – Brain, Liver, heart, Tumors Radioisotopes: radioactively decaying elements *Radioisotope- unstable element that emits radiation as it decays. Ex. “Iodine-131” used in thyroid function scans. Brain activity during depression (left) or normal brain activity (right). Decreased areas of bright white/yellow shows decreased brain activity due to depression. http://www.riversideonline.com/health_reference/Articles/CA00052.cfm http://www.mayoclinic.com/health/medical/IM00357 P.E.T. Scan – Positron Emission Tomography Tumor fluoresces much more than surrounding tissue. Fast growing cancer cells use more “tagged” glucose than other tissue. http://www.aboutcancer.com/pet_scan.htm MRI- Magnetic Resonance Imaging -No radiation – Computers analyze body structure with use of a Magnetic field -Most detailed FYI...Magnetic Field induces alignment of poles in molecules of tissues; Differing tissues will have different strength and rate of return to original state....allowing great contrast of all tissue types. MRI - Magnetic Resonance Imaging http://en.wikipedia.org/wiki/Magnetic_resonance_imaging http://www.photosfan.com/mri / http://www.ct-scan-info.com/head- CT Scan (or CAT Scan) http://www.radiologyinfo.org/en/photocat/gallery3.cfm ?pid=1&image=philip25.jpg&pg=bodyct ...aka...CT – Computer Tomography X-rays combined w/computers (computer enhances image...better than plain x-ray film and can see tissue/organs Inexpensive Quickly Scan...minutes Good in emergency situations! Radioactive dye(“contrast”) can be used..see blood vessels.... When may this be useful? What emergency occurrence? CT Scan (Computer Tomography) http://www.ct-scan-info.com/headct.html http://hybridmedical.com/default.aspx