Respiratory and postprandial changes in portal flow rate: Assessment by phase contrast MR imaging
Respiratory and postprandial changes in portal flow rate: Assessment by phase contrast MR imaging
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门脉流速的呼吸和餐后变化：通过相差 MR 成像进行评估
DOI：
10.1002/jmri.1880060118
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发表时间：
1996
影响因子：
4.4
通讯作者：
D. Mitchell
中科院分区：
文献类型：
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作者：
A. Sadek;Feroze B. Mohamed;E. Outwater;S. El;D. Mitchell
本研究的目的是研究几种不同的相位对比(PC)磁共振技术和双工多普勒成像(DDI)测量标准餐前后不同呼吸模式的门脉血流速度(PFR)的变异性。用2D和电影PC MR技术测量了9名正常志愿者在空腹和餐后状态下的PFR。在屏气(BH)和不屏气(BH)的情况下进行二维PC技术。使用四种不同的BH模式(放松最大吸气、呼气、Valsalva动作和Müler或反转Valsalva)。电影PC技术在没有BH的情况下进行。在空腹、放松吸气状态下测量PFR的DDI。根据BH方法的不同，PC MR技术测量的PFR各不相同，并且系统地小于DDI的测量结果。吸气时测得的PFR明显小于呼气和其他呼吸动作时测得的PFR(P<；.03)。餐后PFR显著增加，平均增加幅度为24%至74%。二维PC-MR成像技术对PFR进行了不同的测量，这取决于它们是否有BH，以及BH的类型。PFR的PC平均值始终小于DDI的平均值。在2D和电影PC MRI技术以及DDI技术中，PFR的生理性吸气减少和餐后增加是明显的。
The objective of this study was to investigate the variability of several different phase contrast (PC) magnetic resonance techniques and duplex Doppler imaging (DDI) for measuring portal flow rate (PFR) with different patterns of respiration before and after a standard meal. PFR was measured in nine normal volunteers in both fasting and postprandial states, using both 2D and cine PC MR techniques. Two‐dimensional PC technique was performed with and without breathhold (BH). Four different patterns of BH (relaxed maximal inspiration, expiration, Valsalva maneuver, and Müller or reversed Valsalva) were used. Cine PC technique was performed without BH. DDI measurement of PFR was done in the fasting state with relaxed inspiration. PFR measurements made by means of PC MR techniques varied, depending on BH method, and were systematically less than those obtained by DDI. PFR measured during inspiration was significantly less than that measured during expiration and other respiratory maneuvers (P < .03). PFR increased significantly after a meal for PC and Doppler measurements, with a range of mean increases of 24 to 74%. Two‐dimensional PC MR imaging techniques yielded differing measurements of PFR, depending on whether they were done with or without BH, as well as on the pattern of BH. PC mean measures of PFR were consistently less than those of DDI. The physiologic inspiratory decreases and postprandial increases of the PFR were evident from 2D and cine PC MRI techniques, as well as with DDI.
DOI：
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发表时间：
1994
期刊：
Magnetic resonance quarterly
影响因子：
--
作者：
Pelc,NJ;Sommer,FG;Li,KC;Brosnan,TJ;Herfkens,RJ;Enzmann,DR
通讯作者：
Enzmann,DR