磁振影像學 artifacts in mri

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http://www.ym.edu.tw/~cflu 陽明醫放:磁振影像學\醫用磁振學 盧家鋒課程教材 2017/09/01 Page 1 磁振影像學 Artifacts in MRI 放射線器材學 1. 圖為美國放射學院(ACRMRI 認證假體(phantom)中的第 11 切面,其可 用來測量下列何種項目? A.影像強度均勻性(image intensity uniformityB.切面厚度正確性(slice thickness accuracyC.低對比解析度(low contrast resolutionD.高對比解析度(high contrast resolution(C, 109 年第二次放射線器材學第 38 ) 2. 造成磁振造影拉鍊假影(zipper artifact)的原因為何? A.沒有均勻的主磁場 B.沒有好的射頻屏蔽 C.沒有均勻的梯度磁場 D.掃描中病人的移動 (B, 109 年第二次放射線器材學第 39 ) 3. 美國放射學院(ACRMRI 認證假體中第 5 切面(如圖)可用來測量什麼項 目? A.影像強度均勻性(image intensity uniformityB.幾何正確性(geometry accuracyC.切面位置正確性(slice position accuracyD.切面厚度正確性 slice thickness accuracy(B, 109 年第一次放射線器材學第 37 )

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2017/09/01 Page 1

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2017/09/01 Page 2

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2017/09/01 Page 3
(C, 106 37)
A.
A.
B.
C.
D.
A.aliasing artifact
B.truncation artifact
C.zipper artifact
D.shadowing artifact
(C, 102 48)


A.
B.
C.
D.
A.RF
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A.RF
(C, 97 39)

(B, 97 45)
A.GE
B.FSE
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B.
C.
A.
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A.aliased frequencyactual frequency
B.high-pass filter
A.3D imaging
B.fast scanning
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(C, 109 45)
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B.
C.
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C. NEX
D. FOV
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C.gradient echo pulse sequence
D.echo planar pulse sequence
(B, 107 50)
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C. FOV
C.TR
D.TE
A.eddy current
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(D, 107 52)
A.aliasing
B.truncation
C.motion artifactin phase
D.truncation artifactout phase

A.2
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B.
A. TR
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A. RF shielding
A. FOV
A.oversampling
B.undersampling

D.metallic foreign body
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A.truncation artifact
B.flow artifact
C.aliasing artifact
D.motion artifact
(D, 103 43)
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A.partial volume
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boundary effectartifact
A.aliasing artifact
B.cross-talk artifact
A.image processing
D.over-sampling
A.fat-suppression techniques
(C, 101 42)
62. MRI
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A.truncation artifact
B.cross-talk artifact
C.aliasing artifact
D.flow artifact
(D, 101 47)
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A.wraparound artifact
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B.
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C.TR
D.TE
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A.chemical-shift artifact
B.truncation artifact
A.chemical shift
B.motion artifacts

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C.
D.
A.chemical-shift artifact
B.motion artifact
C.aliasing artifact
D.RF noise
(C, 97 51)
2017/09/01 Page 20
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B.
C.
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A. shimming
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D.cross-talk effect
A. FOV
D. sampling time
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