PHYS1008 Study Guide - Final Guide: Gamma Camera, Photomultiplier, Cyclotron
2 Aug 2018
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Document Summary
Cross-sectional images of distribution of a radiopharmaceutical in the body. Removes overlying structures from the image (another above and below a specific slice) Determines size and volume allowing for quantification. Less expensive (detector is much more straightforward) Standard radiopharmaceuticals used no cyclotron needed. 85-90% of disease processes studied with pet are oncology based. Tc is the only one that needs a reactor, most popular due to its short half-life. Short-lived excited nucleus decays into a more stable form and releases a y-ray photon. Single y-ray photon is generated for each nuclear de-excitation event. Multi-radioisotope resolution possible as energy of y-ray photon generated is dependent on the radioisotope used. Collimator: lead or tungsten, anything going in the correct direction can travel upwards, scattered radiation/radiation going in the wrong direction absorbed, need to re(cid:373)o(cid:448)e scatter as (cid:455)ou do(cid:374)(cid:859)t k(cid:374)o(cid:449) e(cid:454)actl(cid:455) (cid:449)here it co(cid:373)es fro(cid:373)
