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rt 115
distortion
| Question | Answer |
|---|---|
| distortion is a misrepresentation of | size and shape |
| size distortion in radiography can be _____ only | magnification |
| size distortion is controlled by | SID, OID and radiographic distances |
| as size distortion decreases, the resolution of recorded detail | increases |
| the _____ the SID, the _______ the magnification | greater, smaller |
| examinations of body parts with a large inherent OID warrant a _________ whenever possible | large SID |
| which examinations DOES NOT exhibit an inherently large OID | AP lumbar spine |
| as OID increases and SID remains constant, entrance skin exposure (ESE) | increases |
| large patients receive a greater exposure than small patients because their: | SOD is decreased, OID is increased, and entrance skin surface is closer to the source |
| the magnification factor for a radiographic procedure is calculated at 1.25. It may be assumed that there is a ________ magnification of the object size | 125% |
| what occurs when the TUBE or the image receptor is not properly aligned | elongation |
| what occurs when the PART is improperly aligned | foreshortening |
| proper alignment is achieved when the central ray is ______ to the part and _______ to the image receptor | perpendicular, perpendicular |
| whyen the position of the part is reversed, the direction of the tube angle must be ______ to maintain the relationship | reversed |
| because the xray beam is divergent, | minification is impossible |
| xray tube angulations inherently | change the SID, and introduce magnification to some degree |
| in order to achieve a true SID of 40" with an x-ray tube angle of 30 degrees, the overhead scale should read: | 34.6" |
| performing a routine chest radiograph in the anterior posterior (AP) projection will | produce improved resolution of the thoracic spine |
| a renal calculus that measures 0.2mm in size | cannot be visualized with an effective focal spot of 0.5mm focal spot due to penumbral overlap |
| opening of the intervertebral joints of the cervical spine would best be accomplished with | the patient in an AP projection with a 40" SID |
| object size | ratio between image size and MF |
| kidneys | best seen with patient supine |
| SID/OID | MF (magnification factor) |
| patella | inherently magnified in AP projection |
| SID/MF | SOD |
Created by:
jhill106
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