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Image acq. & eval
ARRT review
| Question | Answer |
|---|---|
| As matrix size increases, what 2 things happen? | pixel size decreases, resolution increases (Saia, 232) |
| As KvP increases, scatter ______. | increases (Saia, 234) |
| As KvP increases, radiographic contrast_______. | decreases (Saia, 234) |
| As KvP increases, exposure rate ______. | increases (Saia, 234) |
| X-ray photon energy is ______ related to wavelength. | inversely (Saia, 236) |
| An increase in ____ serves to increase the number of photons produces at the target. | Ma (Saia, 236) |
| What is 2 dimensional, travels in the xy plane, and is a picture element? | Pixel (Saia, 240) |
| What is 3 dimensional, travels in the 2 plane, and is the depth of a pixel? | voxel (Saia, 241) |
| As FOV increases, pixel size ______. | increases (Saia, 242) |
| As FOV increases, the part being examines is ______. | magnified (Saia,242) |
| Low contrast, _____ scale. | long (Saia, 243) |
| High contrast, _____ scale. | short (saia, 243) |
| Osteoporosis, osteomalacia, and degenerative arthritis require a _______ in exposure factor | decrease (Saia 245) |
| Pneumoperitoneum, emphysema, necrotic, and atrophic conditions require a _______ in exposure factor | decrease (Saia 245) |
| Osteosclerosis, ascites, Atelectasis, edematous tissue and congestive heart failure require a _______ in exposure factor | increase (Saia 245) |
| Rheumatoid arthritis, pleural effusion, paget disease, and pneumonia require a _______ in exposure factor | increase (Saia 245) |
| As KvP increases, the wave length gets ____. | shorter (Saia 247) |
| As KvP increases, patient absorption ____. | decreases (Saia 247) |
| _____ illustrates pixel value distribution that is representative of a grayscale, and there are different ones for each body part. | histogram (Saia 247) |
| Histograms can be affected by? (8) | algorithm, scatter, SID, SOD, OID, collimation, positioning, centering (Saia 247) |
| The quantity of photons produced at the focal spot is a result of Ma, so an increase in focal spot size will ______ exposure rate | increase (Saia 248) |
| Diagnostic x-rays are _____ frequency and ______ wavelength. | high, short (Saia 248) |
| On lateral chest, outer photocells are selected, the film will be ______ and _____ density because the x-ray will be terminated almost immediately. | underexposure, decreased (saia 249) |
| Scatter radiation produces ____ on a film & _____ contrast, makes it have a _____ scale. | fog, decreases, longer(Saia 249) |
| As DEL increases, __________ increases | spatial resolution (saia 256) |
| As DEL decreases, ____________ | Spatial resolution decreases (saia 256) |
| An increase in KVP will produce a ____ scale of contrast. | longer (saia 256) |
| A decrease in KVP will produce a _____ scale of contrast. | shorter (saia 256) |
| Magnification in fluoro is accomplished by moving the II focal point _____ from the output phosphor | further (Saia 257) |
| Magnification in fluoro is accomplished by selecting a ____ part of the ____ phosphor | smaller, input (saia 257) |
| Processing algorithm represents the ______ and ______. | anatomical part and projection (Saia 258) |
| A decrease in KV will result in a _____ of optical density. | decrease (saia 260) |
| To make a noticeable change in density, increase mAs by ____ %. | 30 (saia 269) |
| As grid ratio is decreased, the scale of contrast gets ______. | longer (saia 269) |
| As grid radio is increased, the scale of contrast gets ______. | shorter (saia 269 |
| To compensate for every 1 inch of OID, an increase of ____ inch of SID is required. | 7 (Saia 269) |
| Using high Kvp ______ exposure latitude. | increases (saia 271) |
| As Kvp increases, it produces _____ scale contrast. | longer (saia 271) |
| As window level increases, _____ increases. | brightness (Saia 273) |
| Window level is associated with image ______. | brightness (saia 273) |
| Window width is associated with image _____. | contrast (saia 273) |
| High KVP= _____ energy = ____ contrast= ____ scale | high, low contrast, longer scale (Wallace 83) |
| Low KVP= ______ energy = _____ contrast= _____ scale | low, high contrast, short scale (Wallace 83) |
| High contrast = _____ scale contrast | short (Wallace 76) |
| low contrast = _____ scale contrast | long (Wallace 76) |
| Scattered radiation _____ contrast | lowers (Wallace 84) |
| High Kvp= _____ scatter= _____ contrast image | more, low (Wallace 85) |
| Low Kvp= ____ scatter = ____ contrast image | less, high (Wallace 85) |
| Use of a grid _____ contrast. | increases (Wallace 102) |
| A small focal spot ______ recorded detail. | increases (Wallace 134) |
| Air gap _____ contrast & _____ density. | increases contrast, decreases density (Wallace 123) |
| Use of filtration ______ density and contras. | decreases (Wallace 120) |
| SID and density are _____ proportional. | inversely (Wallace 176) |
| OID and density are ____ proportional. | inversely (Wallace 176) |
| A grid with a higher ratio has more lead, and ____ density. | decrease(Wallace 176) |
| A large collimation field size produces ____ scatter and ____ density. | more, more (Wallace 176) |
| A high screen speed _____ density. | increases (Wallace 176) |
| Developer temperature and density are _____ proportional. | directly (Wallace 176) |
| SID _____ contrast. | doesn't affect(Wallace 178) |
| OID and contrast are _____ proportional. | directly (Wallace 178) |
| Focal spot ______ contrast. | doesn't affect (Wallace 178) |
| Increase in collimation size, _____ contrast. | decreases (Wallace 178) |
| When going from a 14x17 to a 4x4, there is ____ scatter and _____ contrast. | less, higher(more) (saia 264) |
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adschutte
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