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Radtimage
Question | Answer |
---|---|
What pixel size has a 512 by 512 matrix with a 20cm FOV? | 0.40 mm/pixel Lange Q&A pg. 195 |
What relationship does SID and recorded detail have? | Direct Lange Q&A pg. 196 |
What modality x-ray tube should be capable of high-speed rotation, short pulsed exposures and able to handle millions of heat units? | CT Lange Q&A pg. 195 |
Which part of a CR image plate records the radiographic image? | photostimulable phosphor Lange Q&A pg. 197 |
The luminescent light emitted by the PSP is transformed into the image seen on the CRT by the _______. | ADC or analog to digital converter Lange Q&A pg. 197 |
The term ______ is able to change the image contrast and density. | windowing Lange Q&A pg. 198 |
If the radiographic object being imaged is placed at an angle to the IR it may cause ______ | foreshortening Lange Q&A pg. 198 |
How should unopened boxes of radiographic film be stored? | vertical Lange Q&A pg. 199 |
True/False: Characteristics of DR imaging include: solid-state detector receptor plates, a direct-capture imaging system, and immediate image display | True Lange Q&A pg. 200 |
The purpose of the automatic processor's transport system is to ______. | move film and change direction Lange Q&A pg. 201 |
What 3 aspects affect the exposure rate of the primary beam? | mA, kVp, and distance Lange Q&A pg. 201 |
Small cresent shaped artifacts on a processed film are the result of ______. | acute bending of film before or after it has been exposed Lange Q&A pg. 203 |
Excessive developer temp, oxidized developer, and excessive replenishment may cause what on an image? | chemical fog Lange Q&A pg. 204 |
What happens to radiographic density if the intensifying screen speed increases? | density increases also Lange Q&A pg. 204 |
If a 48" SID is used, how much OID must be used to magnify an object two times? | 24" OID Lange Q&A pg. 204 |
The direction of electron travel in the x-ray tube is ______ | Cathode to anode Lange Q&A pg. 205 |
What is the absorption of useful radiation by a grid? | grid cutoff Lange Q&A pg. 206 |
What is likely to result from using single-emulsion film in an IR that has two intensifying screens? | decreased density Lange Q&A pg. 206 |
A 15% decrease in kV accompanied by a 50% increase in mAs will result in ________. | shorter scale of contrast Lange Q&A pg. 206 |
Focal spot ____ is greatest toward the cathode end of the x-ray beam. | blur Lange Q&A pg. 207 |
What pathology would require a decrease in exposure factors? | emphysema Lange Q&A pg. 208 |
If an image exposed using a 12:1 grid exhibits a loss of density at its lateral edges, it may be because the ___ was too great. | SID Lange Q&A pg. 208 |
Film sensitivity must be matched with the proper color screen fluorescence. | Spectral matching Lange Q&A pg. 208 |
Order of radiograph film processing. (4 steps) | developer, fixer, wash, dry Lange Q&A pg. 209 |
What pathologic condition may require a decrease in exposure factors? | Osteoporosis Lange Q&A pg. 209 |
A film that has been processed but not exposed will have a density of ____. | 0.1 Lange Q&A pg. 210 |
What device is used to overcome severe variation in patient anatomy or tissue density, providing more uniform density. | compensating filter Lange Q&A pg. 211 |
The microswitch for controlling the amount of replenishment used in an automatic processor is located where? | At the entrance roller Lange Q&A pg. 212 |
True/False: Bone density is often performed to measure degree of bone mineralization and evaluate the results of osteoporosis treatment. | True Lange Q&A pg. 212 |
What matrix size produces the best image resolution? | 2048 X 2048 Lange Q&A pg. 213 |
What is used to determine the sensitivity of a particular film emulsion? | Sensitometric curve Lange Q&A pg. 213 |