RADT 156 FINAL EXAM QUESTIONS WITH 100 % CORRECT ANSWERS | VERIFIED

What is the purpose of developing exposure charts? - Answer-Patient dose and image quality The output screen of a fluoroscopic image intensifier tube is composed of? - Answer-zinc cadmium sulfide The "Electron Image" of the image intensifier tube is formed by electrons released from the... - Answer-photocathode Digital fluoroscopy has numerous benefits, what is the one very important benefit? - Answerdecreased patient dose Digital fluoroscopy can capture an image in... - Answer-33 milliseconds When should you develop a new exposure chart and how often? - Answer-change in image chain with film speed/screens, equipment and should be changed annually Input phosphor screen is made up of what? - Answer-Cesium Iodide What are the three tubes in Image Intensified Fluoroscopy? - Answer-Image Intensifier, TV Camera Tube & Cathode Ray Tube System of tubes and devices to brighten fluoroscopic image to reduce patient dose and improve image quality. - Answer-Image Intensified Fluoroscopy What are the advantages of Image Intensified Fluoroscopy? - Answer-Improved brightness levels, improved visual acuity and contrast and lower patient dose What does the Image Intensifier tube consist of? - Answer-glass envelope, gas evacuated tube, input screen, photocathode, electrostatic lens, electronic focal spot, output phosphor What does the input screen do in the image intensifer tube? - Answer-converts photons to visible lightWhat are the dimensions for the dual and tri focused input phosphor screens? - Answer-Dual focus (6"to 9" diameter), Tri-focus (4"/7"/10" diameter) What is the photocathode in the image intensifier tube made out of and what does it convert? - Answer-Antinomy sulfite, converts visible light to electrons What helps focus electrons from input screen onto the output screen and is negatively charged in the image intensifier tube? - Answer-Electrostatic Lens When does the Focal Spot location change in the image intensifier tube? - Answer-when kV changes What is the Electronic focal spot? - Answer-Point that electrons crossover and intersect in the image intensifer tube. How big is the Output phosphor screen in the image intensifier tube? - Answer-1" in diameter (smaller than input screen) What does the Output Phosphor screen do in the image intensifier tube? - Answer-Converts the electronic image back to a visible image What is brightness gain? - Answer-total increase in brightness