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radiologyct
image quality
| Question | Answer |
|---|---|
| image quality defined is the comparison of the image to the actual object. quality is a subjective notion and is dependent on the purpose of the image | Image quality |
| Responsibility of the CT technologist | understanding the parameters of CT image quality and prompt id of the causes of CT image degradation and ability to implement appropriate technical solutions |
| Factors that affect quality of image | ma, scan time , fov, reconstruction agorithm, kvp, pitch. |
| ma and scan time | the quantity of x-ray produce is a product of mA, together define the quantity of the x-ray energy |
| Automatic Tube Current Modulation | software that automatically adjusts the mAs to fit the specific anatomic region |
| Higher mA setting allows | shorter scan times to be used |
| shorter scan time is critica in | avoiding image degradation as a result of patient motion |
| total mas can be maintain | with shortest scan times |
| kVP | the qulity or average energy of the xray beam |
| The thicker and denser the part being examined | more mas required to produce a dx image |
| KVp does not change in | CT |
| short scan times is critical in | avoiding image degradation why patient motion |
| Thicker and denser the part being examined | more mAs required to produce a dx image |
| kVp | quality or average energy of the x-ray beam, in CT kvp does not change contrast |
| ct has more------------ than conventional radiography | more choices for ma setting tha |
| Increase MAS Spatial resolution | unchange |
| Increase MAS Noise | Decrease |
| Increase MAS Dose | Increase |
| Less Noise allows______ _____ to be distinguished and makes low contrast structures easier to see | finer detail |
| Increase kVp contrast | may be increased or decrease |
| Increase kvp spatial resolution | unchanaged |
| Increase kvp Noise | Decrease |
| Photons are mad more penetrating for ____ in order to maximize the contrast b/t tissues | large patient |
| Slice thickness increase contrast resolution | unchanged |
| Slice thickness increase Noise | Decrease |
| Slice thickness increase Spatial resolution | Decrease |
| Improves visualization of large structures due to______, but promotes partial volume artifact | less noise |
| Slice thickness increase Dose | may decrease |
| Increasing table increment contrast resolution | unchanged |
| Increasing table increment Spatial resolution | may decrease |
| Increasing table increment Noice | unchanged |
| Increasing table increment Dose | Decrease |
| Increasing Pitch Contrast Resolution and Spatial Resolution | unchanged / may decrease |
| Fov increasing Contrast Resolution and Spatial Resolution | unchanged / decrease |
| Increasing Pitch Noise and Dose | unchanged, Decrease |
| FOV increasing Noise and Dose | Decrease, unchanged |
| Matrix increase, contrast resolution and spatial resolution | unchanged / increase |
| Matrix increase Noise and Dose will | increase / unchanged |
| Uses ___pixels so____structures can be resolved | smaller, smaller |
| Reconstruction filter increase for shapness contrast and spatial resolution | decrease and increase |
| Rexonstruction filter increase for sharpness Noise and Dose will | Increase /unchanged |
Created by:
Fresh26
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