Fluoroscopy Main Exam 100% Verified Answers 2025

Total filtration permanently required in the useful fluoroscopic beam should not be less than - Correct Ans-2.5mm Aluminum If X-ray source is below the table, useful beam exposure must be measured at what distance above the table top - Correct Ans-30 cm Table top exposure rates for units without auto exposure control must be measured every - Correct Ans-3 years Dark adaptation for the eye takes how long - Correct Ans-30 minutes Target-to-tabletop distance must be greater than and should be greater than... - Correct Ans-12 and 18 inches Integration time for brain to recognize an object - Correct Ans-0.2 seconds Most scatter occurs at which direction from the primary beam - Correct Ans-135 degrees mA setting for spot filming where a spot film camera is not used - Correct Ans-150 mA Greatest dose to the patient comes from spot filming cameras using this film size - Correct Ans-105 mm SI unit analogous to the rad is - Correct Ans-Gray _________ is a variation in density resulting from the random spatial distribution of quanta. - Correct Ans-Quantum sink SI unit analogous to the rem - Correct Ans-Sievert (unit) Exposure reduction of .25 mm lead - Correct Ans-97% Scattered radiation received is proportional to - Correct Ans-Dose received by the patient Most effective medium for static viewing in terms of reducing patient dose - Correct Ans-Video disc recorder Contrast of the image intensifying tube is measured by - Correct Ans-conversion factor maximum magnification for cinefluorography is done via which method - Correct Ans-total over framing Ratio of photons that leave the output phosphor to the number of Xray photons that strike the input phosphor - Correct Ans-Flux gain Half value layer determines which characteristic of the Xray - Correct Ans-Xray quality Ability to distinguish separate objects in line pairs per mm - Correct Ans-Resolving power The portion of the image intensifier responsible for magnification - Correct Ans-electrostatic lenses resolution of a 9 inch image intensifier tube - Correct Ans-3.5 line pairs per millimeter light photons intercepting when electrons strike a fluorescent screen forms a... - Correct Ans-Real image Fluoro with a grid in place affects exposure rates how - Correct Ans-1.5-2 x higher Greatest radiosensitivity of fetus occurs when - Correct Ans-2-8 weeks gestation The quantity of the beam is controlled by which unit of measurement - Correct Ans-miliamperage Which fluoroscopic method gives patient dose reduction of up to to 95%? - Correct Ans-video disc recorder 100erg/gram is equivalent to? - Correct Ans-1 rad Fluoro units with AECs or CINE cameras must have physicist calibration how often - Correct Ans-every year Which imaging modality has the best resolution - Correct Ans-Radiograph Compared to the input phosphor, the image output phosphor is... - Correct Ans-Smaller and brighter As spot film size increases, what happens to the patient dose? - Correct Ans-Patient dose increases Unit used to specify the quality of an X-ray beam - Correct Ans-HVL cycles per time unit in a TV camera is known as... - Correct Ans-bandwidth types of pick-up tubes - Correct Ans-plumicon, vidicon, orthicon TV camera element which converts light to an electric signal - Correct Ans-Pickup Output intensity is measured in... - Correct Ans-mR or R Brightness ratio of the periphery to the center of the output screen is termed: - Correct Ans-Contrast How is resolving power measured? - Correct Ans-Line pairs per milimeter Which factors produce a brighter image at the output phosphor? - Correct Ans-Flux gain and minification What type of TV system has all its signals carried through cables? - Correct Ans-Closed circuit TV Output intensity of a tube is measured in... - Correct Ans-Miliroentgens Electronic intensification occurs when... - Correct Ans-Electrons are moved at high speed from photocathode to output phosphor genetic dose means.. - Correct Ans-Effects exhibited in future offspring of persons who have been irradiated Dose effect curve that radiation protection guides are based on... - Correct Ans-linear nonthreshold curve A disadvantage of thermoluminescent dosimeters - Correct Ans-No permanent record is provided Rem is a unit of - Correct Ans-Absorbed dose equivalent Rad is the unit of - Correct Ans-Absorbed dose Half value layer defined - Correct Ans-The thickness of a specified substance which reduces the exposure rate of the primary beam by one half A material placed in the useful primary X-ray beam to absorb preferentially the less penetrating radiations - Correct Ans-Filter Most common material used in thermoluminescent dosimeters - Correct Ans-lithium fluoride