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RADT 465 Img. Acq
ARRT Review coering Image Acquisition and Evaluation
| Question | Answer |
|---|---|
| Exposure factors include: (pg.298) | mA, time, kV, distance |
| Visibility factors include: (pg. 298) | Density/Brightness and Contrast/Gray Scale |
| Geometric factors include: (pg. 298) | Detail/Resolution and Distortion |
| refers to the clarity, or resolution, with which anatomic structures are represented in the x-ray image (pg. 298) | recorded detail |
| refers to size distortion (pg. 298) | magnification |
| refers to shape distortion (pg.298) | elongation/foreshortening |
| Factors that affect size distortion/ magnification: (pg. 298) | OID and SID |
| Factors that affect shape distortion: (pg. 298) | Alignment of the x-ray tube, anatomic part, and IR |
| The term used to describe the IR's impact on recorded detail in CR/DR is: (pg. 300) | spatial resolution |
| Recorded detail and magnification are ______ related. That is recorded detail _______ and magnification decreases. (pg 301) | inversely, increases |
| SID is ________ related to magnification. (pg. 301_ | inversely |
| SID is ______ related to recorded detail. (pg. 301) | directly |
| OID is ______ related to magnification. (pg. 301) | directly |
| OID is _________ related to recorded detail (pg. 301) | inversely |
| True or False Changes in OID impact detail more significantly than similar changes in SID. (pg. 301) | TRUE |
| The anode heel effect is most pronounced using: (pg. 309) | large IRs, short SIDS, and small anode angles |
| Peristaltic activity, muscle spasms, and heart action are considered _____________ motion. (pg. 309) | involuntary |
| The best way to minimize involuntary motion: (pg. 309) | use the shortest possible exposure time |
| To minimize voluntary motion: (page 310) | Use good communication and suspended respiration |
| Gadolinium, Lanthanum, Yttrium are all: ( pg. 311) | Rare earth phosphors |
| _______ is responsible for more than 98% of film emulsion exposure. (pg. 313) | Fluorescent light |
| Any combination of mA and time that will produce a given mAs will produce identical radiographic density according to the: (pg. 318) | reciprocity law |
| At least a ___% change must be made in mAs for there to be a perceptible change in radiographic density. (pg. 318) | 30 |
| As SID increases, exposure rate and image density _______. (pg. 320) | decrease |
| Increased kV produces ____ high energy photons, so exposure rate increases. (pg. 321) | more |
| Screen speed and image density are _____ proportional. (pg. 322) | directly |
| Screen speed and patient dose are _____ proportional. (pg. 322) | inversely |
| High contrast is: (page. 340) | short-scale contrast |
| Low contrast is: (page. 340) | long-scale contrast |
| High contrast displays: (page 340). | few, very different, image/tissue densities |
Created by:
jkcottongim
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