3-POINT PHASE-CONTRAST VELOCITY-MEASUREMENTS WITH INCREASED VELOCITY-TO-NOISE RATIO

被引：102

作者：

LEE, AT ^{[1
]}

PIKE, GB ^{[1
]}

PELC, NJ ^{[1
]}

机构：

[1] MCGILL UNIV,MONTREAL NEUROL INST,MCCONNEL BRAIN IMAGING CTR,MONTREAL,PQ,CANADA

来源：

MAGNETIC RESONANCE IN MEDICINE | 1995年 / 33卷 / 01期

关键词：

PHASE-CONTRAST VELOCITY IMAGING; MULTIPLE-VENC IMAGING; SNR; FLOW IMAGING;

D O I：

10.1002/mrm.1910330119

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

We describe a technique to increase the velocity-to-noise ratio (VNR) of phase-contrast magnetic-resonance velocity images based on making three measurements/flow encoding axis rather than the usual two, A phase-aliased high first moment data set and a nonaliased low first moment data set are acquired, and the high-moment data are phase unwrapped using the low-moment data. The VNR of the resulting measurement is given by that of the high-moment measurement and increases linearly with the first moment. A factor of 4 gain in VNR was observed with only a 50% increase in scan time. Thus, this method is a much more efficient way to increase VNR than simple averaging.

引用

页码：122 / 126

页数：5

共 8 条

[1]

O'Donnell M., NMR blood flow imaging using multi‐echo, phase contrast sequences, Med. Phys., 12, pp. 59-64, (1985)

[2]

Caprihan A., Altobelli S.A., Benitez-Read E., Flow‐velocity imaging from linear regression of phase images with techniques for reducing eddy‐current effects, J. Magn. Reson., 90, pp. 71-89, (1990)

[3]

Caprihan A., Icenogle M.V., A weighted least‐squares method for nuclear magnetic resonance velocity imaging, Magn. Reson. Med., 29, pp. 512-520, (1993)

[4]

Conturo T.E., Smith G.D., Signal‐to‐noise in phase angle reconstruction: dynamic range extension using phase reference offsets, Magn. Reson. Magn., 15, pp. 420-437, (1990)

[5]

Pelc N.J., Bernstein M.A., Shimakawa A., Glover G.H., Encoding strategies for three‐direction phase‐contrast MR imaging of flow, J. Magn. Reson. Imaging, 1, pp. 405-413, (1991)

[6]

Pike G.B., Meyer C.H., Pelc N.J., (1993)

[7]

Song S.M., Napel S., Pelc N.J., Glover G.H.

[8]

Axel L., Morton D., Correction of phase wrapping in magnetic resonance imaging, Med. Phys., 16, pp. 284-287, (1989)

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