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CALIFORNIA FLUOROSCOPY SUPERVISOR AND
OPERATOR RETAKE ACTUAL EXAM 2025 TEST BANK
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The major reason that image intensified fluoroscopy is employed is that it allows for: a. Dynamic viewing b. Rapid development c. High visual acuity d. Low patient exposure - CORRECT ANSWER >>> a. Dynamic viewing Portable intensified fluoroscopy used for diagnostic purposes must not exceed ____ at the tabletop: a. 1 R/min b. 3 R/min c. 5 R/min d. 10 R/min - CORRECT ANSWER >>> c. 5 R/min Which type of vision is most commonly employed during conventional fluoroscopic exam? a. Photopic b. Scotopic c. Mesopic
d. Lovotopic - CORRECT ANSWER >>> a. Photopic As the illumination of the light source increases, visual acuity: a. Increases b. Decreases c. Remains the same - CORRECT ANSWER >>> a. Increases note: at low light = visual acuity is lowest at bright light = visual acuity is max The time over which the human eye can store a visual image is termed _____ time: a. Adaptation b. Acuity c. Integration d. Illumination - CORRECT ANSWER >>> c. Integration Which of the following structures if first to intercept light incident on the eye a. Rods b. Iris c. Cornea
a. 5 - 15 sec b. 10 - 20 sec c. 25 - 30 sec d. 30 - 40 sec - CORRECT ANSWER >>> c. 25-30 sec Visible light: a. Is not part of the electromagnetic spectrum b. Has higher energy than x-rays c. Is the only part of the electromagnetic spectrum we can see d. Has lower energy than radiowaves - CORRECT ANSWER >>> c. Is the only part of the electromagnetic spectrum we can see Most modern image intensifiers use an input fluorescent screen layer that is composed of: a. Calcium tungstate b. Cesium iodide c. Barium lead sulfate d. Zinc cadmium sulfide - CORRECT ANSWER >>> b. Cesium iodide The conversion of light energy into a proportional amount of electrons is accomplished by a/an: a. Electron gun b. Photomultiplier c. Electrostatic lens d. Photocathode - CORRECT ANSWER >>> d. Photocathode
The acceleration of the electron stream inside the image intensifier requires a potential difference (voltage) of a. 25 volts b. 50 volts c. 25 kilovolts d. 50 kilovolts - CORRECT ANSWER >>> c. 25 kilovolts The ouput screen of an image intesifier functions to convert ___ into ____ : a. Light, electrons b. Light, x-rays c. Electrons, light d. X-rays, electrons - CORRECT ANSWER >>> c. Electrons, light The target to panel and target to skin distance shall not be less than: a. 18 in b. 35 cm c. 40 in d. 12 in - CORRECT ANSWER >>> d. 12 in The squared ratio of input screen to output screen is called: a. Minification ratio
Which of the following could be used to increase brightness gain? a. A higher x-ray beam intensity b. Decrease minification ratio c. Increase accelerating voltage d. All of the above - CORRECT ANSWER >>> a. A higher x-ray beam intensity The focusing of the electron stream in the image intesifier tube placing a ____ charge on the electrostatic lens: a. Negative b. Positive c. Neither of the above - CORRECT ANSWER >>> b. Positive Distortion, which occurs with an image intensifier tube that shows a low density image at the periphery, is called: a. Interlacing b. Vignetting c. Diminution d. Edge spread function - CORRECT ANSWER >>> b. Vignetting The random pattern of scattered radiation, which often results in an image intensifier tube that has the appearance of "snow" or "crawling ants" is: a. Lens opacity
b. Vignetting c. Quantum noise d. Flicker effect - CORRECT ANSWER >>> c. Quantum noise The ratio of the luminance in candelas of the output phosphor to the input exposure rate in milliroentgens/sec defines: a. Brightness gain b. Flux gain c. Minification ratio d. Conversion factor - CORRECT ANSWER >>> d. Conversion factor The output phosphor of most modern intensifiers is: a. Zinc cadmium sulfide b. Cesium iodide c. Sodium iodide d. Calcium tungstate - CORRECT ANSWER >>> a. Zinc cadmium sulfide The output phosphor converts electrons into: a. Secondary electrons b. Light photons c. X-ray photons d. Globules - CORRECT ANSWER >>> b. Light photons
c. Sievert d. Resolution - CORRECT ANSWER >>> b. Quantum mottle The resolution of cesium iodide image tubes is approximately a. 4 lp/mm b. 1 lp/mm c. 10 lp/mm d. 20 lp/mm - CORRECT ANSWER >>> a. 4 lp/mm Which of the following cannot reduce patient exposure and operator exposure: a. Restricting the x-ray beam "on" time to a minimum b. Using the lowest mA and highest kVp c. Restricting the x-ray beam to the smallest size d. Keeping patient-screen distance to a maximum - CORRECT ANSWER >>> d. Keeping patientscreen distance to a maximum A photocell located between the image intensifier and the television camera system that is designed to maintain a range of brightness is a: a. Photoemitter b. Vidicon c. Automatic brightness stabilizer d. None of the above - CORRECT ANSWER >>> c. Automatic brightness stabilizer
In order to maintain image clarity, the path of electron flow from the photocathode to the output phosphor is controlled by: a. Accelerating anode b. Electrostatic lens c. The vaccum glass tube d. Input phosphor - CORRECT ANSWER >>> b. Electrostatic lens The image intensifier input phosphor differs from the output phosphor in that the input phosphor: a. Is much larger than the output b. Emits electrons, and the output phosphor emits light photons c. Absorbs electrons, and the output phosphor absorbs light photons d. Are fixed sizes, and the output phosphor size can vary - CORRECT ANSWER >>> a. Is much larger than the output The total brightness gain of an image intensifier is a result of (1) flux gain, (2) minification ratio, (3) focusing gain: a. 1 b. 2 c. 1 and 2 d. 1 and 3 - CORRECT ANSWER >>> c. 1 and 2 The electronic image, which is produced at the input side of a television camera, is canned by means of a/an:
a. Synchronization pulse b. Bandpass c. Return beam d. Video signal - CORRECT ANSWER >>> d. Video signal In the television monitor, an electron gun repeats the pattern of the television camera tube's image onto a/an: a. Photocathode b. Fluorescent screen c. Photographic film d. X-ray film - CORRECT ANSWER >>> b. Fluorescent screen In order to ensure the proper eye integration, a frame must be completed every: a. 1/30 sec b. 1/10 sec c. 1/8 sec d. 1/5 sec - CORRECT ANSWER >>> a. 1/30 sec In order to prevent the flicker effect during viewing the television image, a technique called ___is used: a. Preamplification b. Interlaced scanning
c. Synchronization d. Depolarization - CORRECT ANSWER >>> b. Interlaced scanning Which of the following are television camera tubes? a. Vidicon b. Image orthicon c. Plumbicon d. All of the above - CORRECT ANSWER >>> d. All of the above The electron beam in the television camera tube is produced by: a. Thermoionic emission b. Photoemission c. Electroemission d. Photoconduction - CORRECT ANSWER >>> a. Thermoionic emission The electorn beam in the television camera tube is controlled by the: a. Deflecting coils b. Electron gun c. Signal plate d. All of the above - CORRECT ANSWER >>> a. Deflecting coils The target assembly of a television camera tube consists of:
The electron beam of the television camera tube is ____ with the television monitor: a. Modulated b. Synchronized c. An area beam d. Blanked - CORRECT ANSWER >>> b. Synchronized One television frame is equal to: a. 1 television field b. 2 television fields c. 252 ½ lines d. 17 milliseconds - CORRECT ANSWER >>> b. 2 television fields The fluoroscopic television operates at a frame rate of: a. 262 ½ frames/ sec b. 525 frames/sec c. 30 frames/sec d. 60 frames/sec - CORRECT ANSWER >>> c. 30 frames/sec Horizontal television resolution is limited principally by the: a. Frame rate
b. Field rate c. Bandpass d. Lines/frame - CORRECT ANSWER >>> c. Bandpass The component in the image intensifier that changes the field from the standard to magnification mode is the: a. Image intensifier collimation b. Getter circuit c. Output phosphor d. Electrostatic lens - CORRECT ANSWER >>> d. Electrostatic lens In most magnetic tape recorders, the magnetic head gap width is on the order of: a. 100 mm b. 0.01 mm c. 0.001 mm d. 10 mm - CORRECT ANSWER >>> c. 0.001 mm The recording head of the videotape receives a changing electric signal, which is transformed into a changing: a. Magnetic field b. Electronic pulse c. Video signal d. Current - CORRECT ANSWER >>> a. Magnetic field
100000 mR = 1 Sv 100 Rad = 1 Sv If the x-ray tube is above the table, the exposure rate shall be measured at ____ above the table: a. 12 " b. 18 " c. 10 " d. 30 " - CORRECT ANSWER >>> a. 12 " When automatic exposure rate control is used, the useful beam exposure rate shall be measured with a phantom equivalent to ____ intercepting the useful beam: a. 12 " of water b. 7 7/8 " of water c. 9 " of water d. 12 " of Lucite - CORRECT ANSWER >>> c. 9 " of water When the TPD is increased from 12 to 18 ", the skin entrance exposure will be reduced by: a. 30% b. 60% c. 40% d. None of the above - CORRECT ANSWER >>> a. 30%
Closer/shorter TPD results in greater skin dose and greater distortion. TPD is increased from 12 to 18" skin entrance exposure is reduced by 30% Note: Standing back by double the distance from a source of radiation (d to 2d) will quarter the dose to the radiologist or radiographer. If you double the distance, the dose decreases to a factor of ¼. For example, if you received 8rads of radiation at 2ft., you would only receive 2rads of radiation at 4ft. Fluoroscopic operators shall restrict the beam "on" time to a minimum. Doubling the exposure time will also ____ the exposure to the patient: a. Quadruple b. One half c. Double d. One fourth - CORRECT ANSWER >>> c. Double The intensity of the x-ray beam at the table top of a fluoroscope should not exceed ______ for each mA of tube current operating at 80 kVp: a. 2.2 R/min b. 4.9 R/min c. 5 R/min d. 10 R/min - CORRECT ANSWER >>> a. 2.2 R/min A certain x-ray tube at some given kVp delivers 3 milliroentgen per 1 mAs at 40" of distance. At 80 " of distance, the radiation output from the x-ray beam will be:
