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What does recorded detail refer to?
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What does distortion relate to?
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RADT456 Image Acquis
ARRT review Image Acquistion and Evaluation
| Question | Answer |
|---|---|
| What does recorded detail refer to? | The sharpness and abruptness of structural detail borders. |
| What does distortion relate to? | It relates to the size and shape of the imaged part compared with the actual size and shape of the anatomic object. |
| How are recorded detail and magnification related? | They are inversely related meaning that recorded detail increases as magnification decreases. |
| SID is inversely related to magnification and directly related to recorded detail. | If SID increases then magnification decreases and if SID increases then recorded detail also increases |
| OID is directly related to magnification and inversely related to recorded detail. | If OID increases then magnification increases and if OID increases then recorded detail decreases. |
| What happens to structures that do not run parallel to the x-ray tube and IR and/or lie outside of the central axis of the x-ray beam? | They will be foreshortened or elongated |
| Focal spot size affects the detail by influencing the degree of blur or unsharpness. | If the focal spot size increases then the blur will increase and the detail will decrease. |
| The use of a small focal spot improves recorded detail but generates _________________ | More heat at the anode |
| Smaller anode angels can permit larger AFS sizes while maintaining small EFS sizes at the expense of | Accentuating the anode heel effect. |
| What is the greatest adversary of recoded detail? | Motion |
| What is involuntary patient motion best minimized by? | Using the shortest possible exposure time |
| What can equipment motions result in? | It can result in loss of recorded detail in the form of image blur. |
| What are the rare earth phosphors? | Gadolinium, Lanthanum, and Yttrium |
| Recorded detail increases as: | Focal spot size decreases, SID increases, OID (magnification) decreases, motion decreases, (shape) distortion decreases, and screen speed decreases |
| Intensifying screen phosphors absorb x-ray photons and emit a | Large quantity of fluorescent light |
| Quantum mottle is more likely to occur when using fast screens with | Low-mAs and high-kV factors |
| Perfect screen-film contact is required to maintain | Recorded detail |
| Any combination of mA and exposure time that will produce a particular mAs, will produce identical image density. | Reciprocity Law |
| mAs is the product of | mA and exposure time in seconds |
| A term that describes density in electronic imaging is: | Brightness |
| Doubling the mAs will double the radiographic density however halving the mAs will | Reduce the density to half |
| What can relatively small changes in SID have a significant effect on? | Image density/brightness |
| If an increase in kV will result in an increase in image density then a decrease in kV will result in: | A decrease in image density |
| X-ray photons can: | Penetrate though the part, scatter within the part, and be absorbed by the part |
| What do intensifying screens amplify the action of x-rays through? | Their property of fluorescence |
| What are the different ways that grids can be used? | They can be parallel, focused, moving, or stationary |
| The amount of scattered radiation reaching the IR is decreased through the combined use of: | Collimators and grids |
| What does filtration do? | It reduces the patient skin dose. |
| Compensating filters are used for: | Anatomic parts that having varying thickness/absorption properties |
| The Anode Heel Effect is emphasized under the following conditions: | At short SID, with large cassettes, with small anode angle x-ray tubes |
Created by:
anbrunes
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