Flashcards in imaging in inflammatory disorders Deck (9)
how PET scans work
patient is given a radioactive tracer ( eg. FDG ) this is metabolised by the body, structures in the body that have the highest rate of metabolism will show up brightest on the scan.
Ideal isotope for labelling
-half-life similar to length of examination
-easy to bind to pharmaceutical component
detection of gamma radiation i gamma camera
gamma radiation is emitted from the body and hits a scintillator, a computer then converts the information from the scintillator into a digital image
detection of gamma rays in PET scan
detectors on opposite sides of a ring around the patient, rotates and detects gamma emmission, this info is converted to an image by a computer.
detection of gamma rays in SPECT
CT version of nuclear medicine, gamma cameras rotate around patient, converted to image by computer.
equivalent period of background radiation for head CT
equivalent period of background radiation for chest CT
equivalent period of background radiation for barium enema