Download Fluoroscopy Exam Q&A: Physics and Principles and more Exams Radiology in PDF only on Docsity!
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d all of the above - correct answer ✅flat panel digital detectors used for fluoroscopy use a amorphous silicon as the digital detector b a cesium iodide scintillator c TFT technology d all of the above d all of the above - correct answer ✅the fluoroscopic carriage commonly supports the a image receptor b power-assist drive controls c fluoroscopic and digital controls d all of the above b too little radiation is hitting the input phosphor - correct answer ✅a fluoroscopic image that appears dark during fluoroscopy indicates a too much radiation is striking the output phosphor b too little radiation is hitting the input phosphor
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c the fluoroscopic field size exceeds the dimensions of the input phosphor d the fluoroscopist has exceeded the limits of the fluoroscopic generator a xray photons; light photons - correct answer ✅the input screen absorbs _____ and emits _____ a xray photons; light photons b xray photons; electrons c light photons; xray photons d electrons; xray photons a 0.5 to 5.0 - correct answer ✅the fluoroscopic mA range is commonly ______ mA a 0.5 to 5. b 5.0 to 10. c 10.0 to 100 d 100 to 500
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c determined by flux gain d all of the above d make sure that all involved personnel are wearing lead protections - correct answer ✅prior to beginning a fluoroscopic procedure using a mobile fluoroscopic system your responsibility as a radiographer is to a ensure all personnel are using personnel monitoring devices b use the highest fluoroscopic kvp and lowest ma permissible to reduce absorbed dose c ensure the fluoroscopic lead curtain is attached to the front of the image receptor d make sure that all involved personnel are wearing lead protections a input screen - correct answer ✅the fluoroscopic image intensification the primary xray beam exits the patient and strikes the _____ of the image intensifier a input screen b electrostatic lenses
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c photocathode d output screen b cannot have an sod less than 1.5 inches - correct answer ✅the fluoroscopic xray tube is different from a radiographic tube in that the fluoro tube a has high heat-loading potential as it operates at very high ma b cannot have an sod less than 15 inches c does not employ a cathode focusing cup assembly d emits predominantly characteristic photons b radiologist - correct answer ✅fluoroscopy is primarily the domain of the a radiographer b radiologist c radiation physicist d radiology manager
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d all of the above c concave - correct answer ✅the input screen of an image intensifier is _____ in shape a oval b rectilinear c concave d convex a have the xray tube positioned above the patient - correct answer ✅a digital R/F system that uses a single detector for all exams would a have the xray tube positioned above the patient b offer lower fluoroscopic radiation dose to the operators head and neck c require the fluoroscopist to stand behind the control booth for all procedures d not be capable of chest radiography at 72 inches
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c vignetting - correct answer ✅the edge distortion problem in image intensification tubes is called a minification b magnification c vignetting d blooming b decrease image smearing or lag - correct answer ✅with digital flat panel fluoro receptors pixel binning will a improve spatial resolution b decrease image smearing or lag c increase image file size d improve low contrast resolution d all of the above - correct answer ✅digitization of the fluoroscopic image permits a image postprocessing b transfer via PACS
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system visualization of small guide wires and catheters in patients is best achieve due to the a increased ergonomic design of these systems b improved low contrast detectability of the detector c lower degree of image blooming or white out on the edge of the image d both b and c b light photons; electrons - correct answer ✅photoemissive materials absorb _____ and emit _____ a xray photons; light photons b light photons; electrons c light photons; xray photons d xray photons; electrons b patient - correct answer ✅during fluoro the principal source of radiation exposure to personnel in the room is the a fluoro xray tube b patient
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c radiologist d table top surface d dynamic real time - correct answer ✅fluoro is a _____ xray examination a dynamic real time b digital static c therapeutic d nonionizing d all of the above - correct answer ✅fluoro resolution with image intensification will vary according to the a minification gain b electrostatic focal point c input and output screen diameter d all of the above a image distortion - correct answer ✅the shape of the image intensifier input screen helps to control
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c electrons - correct answer ✅electrostatic lenses are used to accelerate and focus a light photons b xray photons c electrons d scattered photons d selecting the magnification mode - correct answer ✅with a flat panel digital fluoro detector image noise can be reduced by a pixel binning b selecting a smaller DEL dimension c using detectors with a lower DQE d selecting the magnification mode c 200 and 400 - correct answer ✅digital fluoro pixels are between ______ um a 50 and 75
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b 100 and 200 c 200 and 400 d 500 and 600 c it covers the bucky slot in the table - correct answer ✅all of the following are true of fluoro lead apron drape EXCEPT a it should be 0.25 mm Pb equivalent b it is designed to absorb a large percent of patient scatter c it covers the bucky slot in the table d it may be dethatched for specific cases b deals with the gain resulting from the conversion of light at the output phosphor - correct answer ✅flux gain a improves image resolution due to the small penumbra created by the output phosphor crystals b deals with the gain resulting from the conversion of light at the output phosphor c is directly related to the input phosphor conversion efficiency
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a concave optical lenses b convex optical lenses c planar lenses d charged electrodes b a dark video image indicates photon starvation to the receptor - correct answer ✅when using ABC it is important to remember that a image brightness is not dose related b a dark video indicates photons starvation to the receptor c collimation and part placement do not impact video image quality d non of the above a increase the fluorotube ma - correct answer ✅the most common solution for quantum mottle is to a increase the fluorotube ma b increase the distance between the patient and the primary barrier
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c decrease the efficiency of the input screen d decrease the efficiency of the flux gain d brightness gain - correct answer ✅the primary ______ occurs from the acceleration and focusing of the electron beam a photophorescence b minification c magnification d brightness gain b greater; closer - correct answer ✅the greater the voltage supplied to the electrostatic lenses the ______ the acceleration and the ______ the focal point to the input screen a greater; farther b greater; closer c lesser; smaller d greater; larger
