Study Guide RADIOLOGY - UMF

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Study Guide – Radiology – Faculty of Medicine - IV th Year 16• d>g p >1 some spaces remain unscanned• d
Study Guide – Radiology – Faculty of Medicine - IV th Year 17• Level: 50 UH• brain Window• Width: 80-100 (-15 to 85 UH)• Level: 35 UHo CT artifacts• Due to malfunctioning or improper adjustment• Artifacts related to patient: metal, movement, breathing, pulsation• Contrast artifacts• Specific artifacts for spiral mode• Partial volume• Photopenia and noise• Motion artifacts• Beam hardening• window artifacts• Please note:• Partial volume effect• Second to setting of inadequate colimation• If slice thickness is too big, the average attenuationcoefficient of various elements does not allowindividualization of what is included in the slicethickness• beam hardening artifact• Occur when Xrays are crossing a dense structure likebone• Example: artifacts of the posterior fossa between bothrocky pyramids• Minimization: using a high kilovoltageSample questions for the written exam of Radiology1. Chose the false statement about X-ray beam colimationa. determine slice thicknessb. May be during emissionc. May be conditioned by the receiver apertured. The smaller it is the greater the radiation dosee. The smaller the better the resolutionAnswer: d2. Bone window:a. is a narrow windowb. is a large windowc. Its level is 0 UHd. Uses fewer shades of graye. The contrast is greatAnswer: b
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Study Guide RADIOLOGY - UMF

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