MEDRADSC 3K03 Lecture Notes - Lecture 8: Image Noise, Radon Transform, Hounsfield Scale
3 Dec 2017
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: to know what something is?: slice thickness / interval, pros/cons, how is it determined, recon algorithms, scan parameters, snr, smart ma, quick review of filtered back projection, step by step. Region of interest (roi: most often circular, but may be elliptical, square, rectangular, or custom drawn, defining the size, shape, and location of the roi is the first step in many display and measurement functions. If standdev of 0: they are 100% certain that readout given is accurate: the higher the standard deviation, the (cid:373)o(cid:396)e (cid:448)a(cid:396)ia(cid:374)(cid:272)e i(cid:374) ct #"s a(cid:373)o(cid:374)gst pi(cid:454)els, affects the degree of confidence, bulky people= image noise. When is it used: reader, to identify tissue type, technologist, ce examinations for identifying optimal enhancement timing parameters. Distance measurements: ct systems allow different measurements to be performed, reporting size of abnormality, placement of biopsy needle (depth, drainage apparatus, grid, scale alongside images, size reference, ruler.
