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60 Cards in this Set
- Front
- Back
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The amount of luminance of a display monitor defines ____________ a. Density b. Brightness c. Contrast d. Spatial Resolution |
b. Brightness |
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The amount of overall blackness on the radiographic image defines _______________ a. Density b. Brightness c. Contrast d. Spatial Resolution |
a. Density
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Different tissues have different characteristic's and attenuate the x-ray beam differently. This allows is to be able to distinguish amongst carious tissues. This explains _____________. a. Contrast b. Spatial resolution c. Density differences d. Subject contrast |
d. Subject contrast |
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a. Detect x-ray photons and convert them into electrons |
d. Few shades of gray between black and white |
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a. Spatial resolution b. Density detail c. Recorded detail d. Subject contrast |
c. Recorded detail |
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A digital term that refers to the smallest detail that can be detected on a radiographic image is: a. Spatial resolution b. Density detail c. Recorded detail d. Subject contrast |
a. Spatial resolution |
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Misrepresentation of the true size and shape of the object being imaged refers to: a. Subject detail b. Recorded detail c. Spatial resolution d. Distortion |
d. Distortion |
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A large OID creates: a. Magnification and improved resolution b. Distortion and better recorded detail c. Magnification and loss of resolution/detail d. An accurate depiction of the object |
c. Magnification and loss of resolution/detail |
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______________ demonstrates a grainy image with density fluctuations as a result of too few x-ray photons being used to create the image. a. Quantum noise b. Quantum mottle c. Radiologic noise d. All the above |
d. All the above |
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The number reflects the quantity of radiation that has struck the digital IR during exposure. a. Exposure value detection number b. Exposure quantifier number c. Exposure delineator number d. Exposure indicator number |
d. Exposure indicator number
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If a technologist selects a different exam on the computer than what was actually performed, the computer will use incorrect algorithms to process the image resulting in: a. Rescaling error b. Histogram error c. No error d. Brightness error |
b. Histogram error |
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a. Distortion b. Artifact c. Mottle d. Noise |
b. Artifact |
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The advantage of faster film-screen systems is: a. Better recorded detail b. Better spatial resolution c. More exposure to the patient d. Less exposure to the patient |
d. Less exposure to the patient |
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Which of the four radiographic quality factors is affected by focal spot size? a. Density b. Contrast c. Recorded detail d. Distortion |
c. Recorded detail |
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a. OID, SID b. Kvp, mas c. SOD, OID d. SID, OID |
d. SID, OID |
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a. Scatter b. Contrast c. Subject contrast d. Absorption |
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a. kvp b. mas c. SID d. Time |
b. mas |
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a. Controls it b. No effect c. Contributes to it d. Enhances it |
b. No effect |
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a. Photons, penetration b. photon, patient safety c. Scatter, contrast d. Scatter, resolution |
c. Scatter, contrast |
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.3 sec ____ sec 40" sid 72" sid 60 kvp 70 kvp 12:1 grid 6:1 grid a. .25 b. .15 c. .35 d. .05 |
b. .15 |
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How many minutes will pass before a audible timer on fluoroscopy unit will sound? a. 1 min b. 3 min c. 5 min d. 10 min |
c. 5 min |
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Which set of factors will provide the highest exposure? 1. 300ma, 2/15 sec, 70kvp, 40"sid 2. 400ma, .02 sec, 80kvp, 56"sid 3. 100ma, .20 sec, 70kvp, 72"sid 4. 500ma, 30msec, 80kvp, 44"sid a. 1 b. 2 c. 3 d. 4 |
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The input phosphor of the image intensifier is made of... a. Zinc cadium sulfide b. Cesium iodide c. Amorphous selenium d. Amorphous silicon |
b. Cesium iodide |
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a. Input phosphor b. Output phosphor c. Electrostatic lens d. Photocathode |
d. photocathode |
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a. The input gain b. Flux gain c. Output gain d. fluoro factor |
b. flux gain
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a. Adjusted brightness control b. Advanced brightness control c. Automatic brightness control d. Automatic brightness constant |
c. Automatic brightness control
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a. Smaller b. Larger c. Different d. Neutral |
a. Smaller |
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a. Less b. Similar c. Increased d. Decreased |
c. increased |
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a. CCD b. Vignetting c. Magnification loss d. Sponge effect |
c. vignetting
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Which of the following was a type of TV camera tube that was used in fluoroscopy in the past? a. CCD b. TFT array c. Photomultiplyer d. Vidicon |
d. Vidicon |
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The tv camera tube was..... a. Photoconductive b. Magnetically induced c. Transparent d. Solar |
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A _________ is a device that converts light into electrical signal and uses a capacitor to store a charge, which can later be converted into a digital image. a. Semi-conductor b. TFT array c. CCD |
c. CCD (charged couple device) |
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ADC stands for: a. Automatic density control b. Analog-digital convertor c. Another diagnostic delay d. Analog-direct-conversion |
b. Analog-digital convertor |
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a. Plumbicon b. CCD array c. Flat panel detector d. CR array |
c. Flat panel detector |
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a. 10 r per sec b. 10 r per min c. 5 r per min d. 100 r per min |
b. 10 r per min |
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a. 30cm/ 12" b. 38cm/ 15" c. 33cm/ 13" d. 25cm/ 10" |
b. 38cm/ 15" |
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a. .35mm b. .25cm c. .25mm d. .15cm |
c. .25mm |
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Source to skin distance on a mobile fluoroscopy unit must be no less than....
a. 30cm/ 12" b. 38cm/ 15" c. 33cm/ 13" d. 25cm/ 10" |
a. 30cm/ 12"
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The protective curtain on the fluoroscopy unit must have ______ lead equivalence. a. .35mm b. .25cm c. .25mm d. .15cm |
b. .25cm
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________ refers to the range of exposure intensities that can be displayed by a radiographic image receptor. a. contrast range b. Dynamic contrast c. Dynamic Range d. Attenuation scale |
c. Dynamic range |
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a. The patient still has to be positioned correctly b. The correct grid must be selected c. Proper collimation must be used d. Technologist does not have to consider technical factors any more. |
d. Technologist does not have to consider technical factors any more. |
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True or false- Film has a larger dynamic range than digital imaging. a. true b. false |
false |
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The digital image is a matrix composed of ______. a. Voxels b. Pixels c. Binary numbers d. TFT arrays |
b. pixels |
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a. .59 mm/pix b. 17mm/pix c. 2.6mm/pix d. 1.7cm/pix |
a. .59/pix |
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a. Contrast b. Scatter c. Attenuation d. Compton |
c. attenuation |
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a. Voxel depth b. number of pixels c. pixel bit depth d. pixel variation |
c. pixel bit depth |
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a. IP b. PMT c. Laser d. Photoconductor |
b. PMT (photomultiplier tube) |
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a. PMT b. IP c. ADC d. CCD |
c. ADC |
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Modern flat panel detectors use a _____ array to read out the exposure signal from the patient. a. CCD b. ADC c. PMT d. TFT |
d. TFT |
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__________ is a type of DR that converts x-ray into light, then the light into an electrical signal. a. Indirect DR b. Direct DR c. CR d. Flat panel direct |
a. Indirect DR |
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a. Cesium iodide b. Amorphous silicon c. Amorphous selenium d. Zinc cadmium sulfide |
c. Amorphous selenium |
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a. Cesium iodide b. Amorphous silicon c. Amorphous selenium d. Calcium tungstate |
b. Amorphous silicon |
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a. LUT table b. Digital matrix c. Voxel value table d. Histogram |
Histogram |
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a. LUT table b. Voxel value table c. Pixel change table d. Digital matrix table |
a. LUT - look up table |
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a. Density on the image b. Contrast value number c. Exposure indicator number d. redness on the patients skin |
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a. Clean the IP b. Erase the IP c. Add density to the IP d. Energize the IP further |
b. Erase |
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a. Density b. Contrast c. Brightness d. Resolution |
b. Contrast |
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Adjusting window level changes the _______ of the digital image.
a. Density b. Contrast c. Brightness d. Resolution |
c. Brightness
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A grainy appearance is probably caused by.... a. Noise b. a lack of x-ray quantity c. Quantum mottle |
All the above |
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a. HL7 b. RIS c. HIS d. DICOM |
d. DICOM |
