1. RAD 254 Chapt. 26 Digtal Imaging Many types/names for the Digital imaging to come

2. Thought A tight beam + close collimation = adequate penetration!

3. Types CR: Barium fluorohalide PSP SPR (scan projection RAD):Nal scintillator/photodiode Indirect DR: Csl, GdOS scintillator Indirect DR: Csl/Charge coupled device Direct DR: a-Se, Thin-film transistor

4. ES’s “Clever approach(capture element, coupling element, collection element “Capture element” how the x-rays are captured (PSP’s, CsI, gado, etc.) “Coupling element” transferring the x-ray “signal” to the collection element “Collection element” devices to either collect light photons or electrons

5. Scan Projection Radiography As in CT, uses a “fan beam” (collimated by pre-pt. collimators) Post pt. remnant beam is collimated by to a “fan” for the detector array – Neither the tube or detector MOVE! SPR is NOT too successful, but is re- emerging for another breath

6. Charge Coupled Devices CCD’s are SMALL, thus GREAT for digital imaging –Have HIGH sensitivity to radiation and WIDE dynamic range (dim to bright lite) –STRAIGHT C & D “curve”

7. Types of CCD’s Cesium Iodide/CCD Cesium Iodide/ Amorphous Silicon Amorphous Selenium