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CA Fluoro Review Test

Enter the letter for the matching Answer
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1.
If the occupational dose is 4 mrem/min at 2.5’ away from the source, at what distance should the technologist stand to reduce it their dose to 3 mrem/min?
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2.
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 & 2 d. 1 & 3 e. 1, 2, & 3
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3.
The maximum exposure rate of a fluoroscopic system is measured using: A. 9” lucite B. 7 7/8” water C. 9” water . Weekly fluoro phantom
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4.
The diameter of the input phosphor to diameter of the output phosphor squared is the formula for: A. Minification gain B. Flux gain C. Magnification D. Brightness gain
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5.
the exposure rate shall be measured ____ above the table. a. 1 in b. 1 cm c. 1 ft d. none of the above
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6.
In order to reduce a 100 mrad/min dose rate to 25 mrad/min, how many half-value layers must be added to the primary beam?
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7.
The input phosphor of an image intensifier is 6” and the output phosphor is 1”. What is the minification gain?
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8.
Visible light: A. Is not a part of the electromagnetic spectrum B. Is higher energy than x-rays C. Is lower energy than radio waves D. None of the above
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9.
Which of the following is directly proportional to the patient dose? A. kVp B. mA C. Filtration D. Target to panel distance (SID)
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10.
horizontal TV resolution is limited principally by the: a. frame rate b. field rate c. bandpass d. lines per frame
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11.
The intensity at the output phosphor will increase with: A. Collimation B. mA C. Filtration D. Rotation
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12.
women employees: (1)1st 3 mo of preg most important (2)actual dose received by fetus<mother (3)risks to unborn baby considered small (4)no worry about sterility/child bearing
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13.
the dead-man type exposure switch (1)terminates the exposure when pressure is released(2)operates by circuit closing contact maintained by continuous pressure(3)circuit will be closed when the operator dies (4)is an electromagnetic relay contact.
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14.
a certain x-ray tube, at some given kilovoltage peak, delivers 4 milliroentgen per 1 milliampere second at 40in of distance. At 20 inch distance, the radiation output from the x-ray beam will be: a. 16mR/mAs b. 8mR/mAs c. 2mR/mAs d. 1mR/mAs
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15.
When the target-to-panel distance is increased, the patient dose is: A. Increased B. Decreased C. Remains the same D. Doubles
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16.
Portable intensified fluoroscopy used for diagnostic purposes must not exceed _______ at the table top?
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17.
in general, during conventional fluoroscopic examinations, the preferred technique is: a. high kVp, low Ma b. high kVp, low mAs c. low kVp, high mAs d. low kVp, high mA
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18.
the electron beam in the TV camera is controlled by the: a. deflecting coils b. electrostatic coils c. focusing coils d. all the above
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19.
the recording head of the video tape recieves a changing electronic signal which is transformed into a changing: a. magnetic field b. electronic pulse c. video signal d. current
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20.
the point in the image intensifier tube where the electrons cross over is termed the:
A.
d. all the above. all coils listed are the same thing
B.
1,2
C.
2.88 ft – Set up the equation and solve for “x”: • Int 1 / Int 2 = Dist2 2 / Dist 1 2 • 4 mrem/3 mrem = x 2 / 2.5 feet 2 • 1.33= x 2/6.25 • 1.33*6.25 =x2 • 8.31 = x 2 • √8.31 =x • x=Answer: 2.88 ft
D.
B. decreased
E.
a. high kVp, low mA
F.
B. mA
G.
36 –Mini gain = Input phos2/ Output phos2 –Min gain = 6”2 / 1”2 –Min gain = 36 / 1 –Answer: Minification Gain = 36
H.
C. 9” water (or 7 7/8” lucite)
I.
c. bandpass
J.
d. none of the above
K.
5R/min (do not assume ABC unless stated)
L.
1,2,3,4
M.
a. magnetic field. anything having to do with VHS uses magnetism
N.
D. None of the above
O.
c. 1 and 2
P.
2 half-value layers – One “half-value” layer would bring the dose to 50 mrad/min. – One more “half-value” layer would bring the dose to 25 mrad/min. – Answer: Two “half-value” layers
Q.
a. 16mR/mAs half distance=4 times the dose
R.
electron focal point
S.
B. mA (assume manual mode, unless specified)
T.
A. minification gain
Type the Answer that corresponds to the displayed Question.
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21.
Survey meters used to monitor radiation exposure operate on the principle of: A. Luminscence B. Fluorescence C. Ionization D. Thermal energy
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22.
Statistical variations in the radiographic image which result in a grainy appearance is termed: A. Contrast resolution B. Edge enhancement C. Quantum mottle D. Tube leakage
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23.
Which of the following structures is first to intercept light incident on the eye?
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24.
the input screen of the TV camera tube converts the light image from the image intensifier into a/an:
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25.
The exposure rate in fluoro shall not exceed _________ measured 30 cm from the input phosphor. A. 2.5 rads/min B. 5 rads/min C. 10 rads/min D. 20 rads/min
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26.
A 9” input screen and 1” output screen increases brightness A. 9 times B. 18 times C. 81 times D. None of the above
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27.
the electronic signal which carries the info from the TV camera to the monitor is termed the:
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28.
which of the following structures is first to intercept light incident on the eye: a. rod b. iris c. cornea d. cones
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29.
isoexposure contours during fluoroscopy will show that at a distance of 3 ft from the head of the table, the radiographer will recieve:
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30.
Which type of vision is most commonly employed during conventional fluoroscopic exams?

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