FRCR: Physics Lectures Diagnostic Radiology. Lecture 4 Film-screen radiography Dr Tim Wood Clinical Scientist. Overview. Film-screen radiography Processing Intensifying screens and the film cassette The characteristic curve and sensitivity Image quality. The story so far….
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Dr Tim Wood
Contrast = OD1 – OD2
gradient = gamma
Gamma, = OD2 – OD1 log E2-log E1
For an acceptable image, require a dose at the image receptor of about 3 μGy for film-screen radiography
This is the exit dose from the patient after attenuation
Entrance surface dose (ESD) is much higher than this;
~10 times greater than exit dose for PA chest
~100 times greater for skull
~1000 times greater for AP pelvis
~5000 times greater for lateral lumbar spine