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33 Cards in this Set
- Front
- Back
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Radiographic technique |
The systematic approach to produce a high quality radiograph |
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Role of rad technique |
To ensure that adequate signal reaches the detector system such that computer algorithms can be successful in making corrections and refinements |
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Final digital image qualities are primarily the result of.. |
Computer operations on the acquired data |
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What factor controls subject contrast? |
Kvp |
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Rescaling.. |
Modifies the contrast of the incoming data set. |
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Rescaling produces what on images |
Uniform density and contrast regardless of amount of exposure |
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LUT |
Table of data (algorithms) that convert input gray level values to desired output values for the displayed image |
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Windowing is what (two ways) |
Width and level |
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Width controls what |
Contrast |
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Level controls what |
Brightness |
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Increase in width and _____ contrast |
Decrease |
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Increase level makes what kinda of image |
Darker |
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No amount of mas can compensate for insufficient what.. |
Kvp |
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What’s the primary cause of scatter? |
Patient size and collimation |
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Periodic noise is technically what.. |
Electronic mottle |
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Definition of periodic noise |
Small artifacts that are all of a roughly consistent size and All occur at the same frequency |
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Random noise |
Consists of small artifacts of variable sized and occurs in irregular, chaotic pattern across image |
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Kvp levels can be increased by 15% across the board for technique charts without.. |
Substantial scatter |
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Too low mas creates what on image |
Mottle |
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Mottle decreases what on an image |
Resolution |
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Expo |
Surface exposure and absorbed dose |
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Prefogging is more detrimental to an image than what |
Scatter created during creation of an image |
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Exposure latitude |
The margin of error in setting a technique that a system will allow |
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Saturation |
Dels in a particula area of the IR have reached the max electrical charge that they can store. All pixels are black. Complete loss of detail |
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Proportional anatomy system does what |
Increase kvp levels display more anatomical data, lower patient dose, and rads can window higher image contrast |
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Purpose of grids |
Improve SNR |
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Off-centering of anatomy can result in.. |
Image Mottle |
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Histogram errors occur when.. |
There is an excess of raw beam included within the Collins Ted field, results in a dark image |
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Segmentation |
Partitioned pattern recognition , determines number and orientation of images on plate, |
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Exposing only 1 field per plate reduces.. |
Segmentation errors |
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EI errors are likely unless.. |
30% of the imaging plate is exposed |
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DR systems are not subject to 30% rule because.. |
System only scans the exposed areas in a linear progression |
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Bilateral views are best when using what technique |
Manual |
