computed tomography 2
問題一覧
1
More dense than water
positive HU
2
Less dense than water
negative HU
3
- the reconstruction of acquired images to produce a section not actually scanned.
reformatting
4
• a detector in the array that measures unattenvated intensity during the scan.
reference detector
5
• magniFication reformatting with minimal distortion.
- Filtered Back Projection Reconstruction: A CT technique that reverses acquisition steps to build up the CT images, widely used in clinical eT SEanNerS.
targeting
6
- Enhances the image by selecting and modifying pixels relevant to the part of interesting being displayed.
- Factors in Selecting CT window
• Window width
• Window level
windowing
7
- Determines the range of cT numbers the image displays:
• Values above selected range appears white, value: belon appear black.
- General Classification of tissues in the Window
• Hyperdense: area with the highest density (white)
• Hypodense: area with the least density (blacks)
• Isodense: area between hyper and hypodense.
window width
8
• area with the highest density (white)
hyperdense
9
• area with the least density (blacks)
hypodense
10
• area between hyper and hypodense.
isodense
11
- Determines the location on the Hounsfield scale which the window width will be centered.
• Sets the center CT number displayed on the monitor.
window level
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30問 • 1年前問題一覧
1
More dense than water
positive HU
2
Less dense than water
negative HU
3
- the reconstruction of acquired images to produce a section not actually scanned.
reformatting
4
• a detector in the array that measures unattenvated intensity during the scan.
reference detector
5
• magniFication reformatting with minimal distortion.
- Filtered Back Projection Reconstruction: A CT technique that reverses acquisition steps to build up the CT images, widely used in clinical eT SEanNerS.
targeting
6
- Enhances the image by selecting and modifying pixels relevant to the part of interesting being displayed.
- Factors in Selecting CT window
• Window width
• Window level
windowing
7
- Determines the range of cT numbers the image displays:
• Values above selected range appears white, value: belon appear black.
- General Classification of tissues in the Window
• Hyperdense: area with the highest density (white)
• Hypodense: area with the least density (blacks)
• Isodense: area between hyper and hypodense.
window width
8
• area with the highest density (white)
hyperdense
9
• area with the least density (blacks)
hypodense
10
• area between hyper and hypodense.
isodense
11
- Determines the location on the Hounsfield scale which the window width will be centered.
• Sets the center CT number displayed on the monitor.
window level