HSCI 20200 Lecture Notes - Lecture 21: Digital Radiography, Photomultiplier, Sodium Iodide
15 Nov 2016
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Document Summary
Liquid scintillation counter: used for lower radiation energies. Solid scintillation detectors: what radiation is what. X-rays in airport security: radiation exposures is cumulative. X-ray radiography: absorption and transmission of x-rays facilitates imaging, digital radiography. Computed tomography (most commonly used technology: conventional radiography suffers from the collapsing of 3d structures into a 2d image, ex. extracting tissue samples for breast cancer, ex. mammogram for pregnancy or cancer detectors. Nuclear medicine: radiologic pharmaceuticals = injections, full-body scans can determine what stages the cancer patients are currently at. Gamma cameras: single-head planar camera, dual head spect camera, anger camera. Detector or scintillator: emits light whenever hot by gamma ray, amount of light is proportional to gamma energy level, photomultiplier tubes read the light signals and translate them into electrical signals. Spect cameras: ~4. 5mm spatial resolution, nuclear medicine tomographic imaging single photon emission computed tomography (spect) Dynamic gated images : perfusion image are viewed in three orientations:
