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rad 107
| Question | Answer |
|---|---|
| 1.The CCD has high sensitivity to x-ray exposure and a very narrow dynamic range. true or false | False |
| 2.Computed radiography uses (a) _____________________ for latent image formation. | photostimulable phosphor |
| 3.What is the most recent development in digital radiography image receptors? | Direct capture solid state devices |
| 4.Spatial resolution is determined by the ratio of ________________ to ____________. | field of view; matrix size |
| 5.The dynamic range determines the degree of __________________ in the image. | contrast resolution |
| 6.Digital radiography first began to be used in clinical settings in the _______. | 1980s |
| 7.One advantage of DR over scanned projection radiography is __________________________. | shorter exposure time |
| 8. In digital radiography, spatial resolution is improved with increased _____________. | matrix size |
| 9.In digital radiography, the visible image results when the _______________ is scanned by a laser beam. | photostimulable phosphor (PSP) |
| 10.The primary limitation of fanned beam radiography is ______________________. | long scanning time |
| 11.CsI/a-Si is an indirect DR process by which x-rays are converted first to light and then to an electronic signal. true or false | True |
| 12.Scanned projection radiography was developed as a complement to ______________. | computed tomography |
| 13.Digital radiography is best described by which three elements? | Capture, coupling, and collection |
| 14.In digital radiography, the brightness of the image is determined by _______________. | pixel values |
| 15Spatial resolution in DR is pixel unlimited. true or false | False |
| 16.Conventional x-ray tubes and image receptors are used with ________ radiography systems. | computed |
| 17.CsI/CCD is an indirect DR process by which x-rays are converted first to light and then to an electronic signal. True or false | True |
| 18.In CR, the capture element is the _____________. | photostimulable phosphor (PSP) |
| 19.Digital radiography is best described by three elements—capture, archiving, and storage. true or False | False |
| 20. Scanned projection radiography differs from conventional radiography in the lack of ____________________________. | scattered x-rays |
| 21.Spatial resolution in DR is limited by ___________. | pixel size |
| 22.Which of the following are capture elements used in DR? | Gadolinium oxysulfide |
| 23.The ability of the CCD to detect and respond to very low levels of visible light is known as ________________. | sensitivity |
| 24.Which of the following is an indirect DR process by which x-rays are converted first to light and then to an electronic signal? | Cesium iodide/charge coupled device (CsI/CCD) |
| 25.Which of the following are collection elements used in DR? | Photodiode |
| 26._________ is the number of gray shades that an imaging system can reproduce. | Dynamic range |
| 27.Which of the following is a measure of x-ray absorption efficiency? | Detective quantum efficiency (DQE) |
| 28.Digital radiography images should be repeated if there is a problem with _________. | positioning |
| 29.The use of an image receptor with _____ DQE can result in _____ patient doses. | high; lower |
| 30._________ is the ability to render small objects on the image. | Spatial resolution |
| 31.Where is the autotransformer located in the circuit? | Control console |
| 32.The principal disadvantage of three-phase equipment is ______. | cost |
| 33.kVp determines the _________ of the x-ray beam and mAs determines the __________ of the x-ray beam. | quality; quantity |
| 34.What is the industry standard formula for calculating high voltage generator power? | Power = max mA (@100 kVp and 100 ms) × 100 kVp |
| 35.A single-phase waveform has _____ ripple. | 100% |
| 36.The _______ is/are inside the glass envelope. | anode |
| 37. Which of the following is the most common cause of tube failure? | Vaporized tungsten |
| 38.The heel effect is caused by the ___________. | anode angle |
| 39.The _______ is located inside the glass envelope. | cathode |
| 40.Localized pitting or cracking on the anode can occur from _____________. | a single excessive exposure |
| 41.The autotransformer has _____ winding(s). | one |
| 42.The first component to receive power in the x-ray circuit is the ______________. | autotransformer |
| 43.The difference in the waveform between the primary and secondary sides of the high voltage transformer is _________. | amplitude |
| 44.The three main parts of the x-ray imaging system are the x-ray tube, ____________, and ____________. | operating console; high voltage generator |
| 45.Variations in power distribution to the x-ray machine are corrected by the ____________. | line voltage compensator |
| 46.The high voltage generator contains the high voltage transformer, the __________, and the ___________. | timer; rectifiers |
| 47.The step-up transformer increases voltage _________ times. | 500 to 1000 |
| 48.A step-down transformer is located in the _______ circuit. | filament |
| 49.The operating console contains circuits that are ________________. | low voltage only |
| 50.Voltage across the x-ray tube is most constant with _________________. | high frequency generators |
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epester