Fluoroscopy Exam Questions Complete Verified Solutions 2025 Update

Fluoroscopy Exam Questions Complete Verified Solutions 2025 Update Total filtration permanently required in the useful fluoroscopic beam should not be less than - Answers - 2.5mm Aluminum If X-ray source is below the table, useful beam exposure must be measured at what distance above the table top - Answers - 30 cm Table top exposure rates for units without auto exposure control must be measured every - Answers - 3 years Dark adaptation for the eye takes how long - Answers - 30 minutes Target-to-tabletop distance must be greater than and should be greater than... - Answers - 12 and 18 inches Integration time for brain to recognize an object - Answers - 0.2 seconds Most scatter occurs at which direction from the primary beam - Answers - 135 degrees mA setting for spot filming where a spot film camera is not used - Answers - 150 mA Greatest dose to the patient comes from spot filming cameras using this film size - Answers - 105 mm SI unit analogous to the rad is - Answers - Gray _________ is a variation in density resulting from the random spatial distribution of quanta. - Answers - Quantum sink SI unit analogous to the rem - Answers - Sievert (unit) Exposure reduction of .25 mm lead - Answers - 97% Scattered radiation received is proportional to - Answers - Dose received by the patient Most effective medium for static viewing in terms of reducing patient dose - Answers - Video disc recorder Contrast of the image intensifying tube is measured by - Answers - conversion factor maximum magnification for cinefluorography is done via which method - Answers - total over framing Ratio of photons that leave the output phosphor to the number of Xray photons that strike the input phosphor - Answers - Flux gain Half value layer determines which characteristic of the Xray - Answers - Xray quality Ability to distinguish separate objects in line pairs per mm - Answers - Resolving power The portion of the image intensifier responsible for magnification - Answers - electrostatic lenses resolution of a 9 inch image intensifier tube - Answers - 3.5 line pairs per millimeter light photons intercepting when electrons strike a fluorescent screen forms a... - Answers - Real image Fluoro with a grid in place affects exposure rates how - Answers - 1.5-2 x higher Greatest radiosensitivity of fetus occurs when - Answers - 2-8 weeks gestation The quantity of the beam is controlled by which unit of measurement - Answers - miliamperage Which fluoroscopic method gives patient dose reduction of up to to 95%? - Answers - video disc recorder 100erg/gram is equivalent to? - Answers - 1 rad Fluoro units with AECs or CINE cameras must have physicist calibration how often - Answers - every year Which imaging modality has the best resolution - Answers - Radiograph Compared to the input phosphor, the image output phosphor is... - Answers - Smaller and brighter As spot film size increases, what happens to the patient dose? - Answers - Patient dose increases Unit used to specify the quality of an X-ray beam - Answers - HVL cycles per time unit in a TV camera is known as... - Answers - bandwidth types of pick-up tubes - Answers - plumicon, vidicon, orthicon TV camera element which converts light to an electric signal - Answers - Pickup Output intensity is measured in... - Answers - mR or R Brightness ratio of the periphery to the center of the output screen is termed: - Answers - Contrast How is resolving power measured? - Answers - Line pairs per milimeter Which factors produce a brighter image at the output phosphor? - Answers - Flux gain and minification What type of TV system has all its signals carried through cables? - Answers - Closed circuit TV Output intensity of a tube is measured in... - Answers - Miliroentgens Electronic intensification occurs when... - Answers - Electrons are moved at high speed from photocathode to output phosphor