𝔖 Bobbio Scriptorium
✦   LIBER   ✦

MR phase-contrast velocity mapping methods for measuring venous blood velocity in the deep veins of the calf

✍ Scribed by Iain T. Pierce; Peter D. Gatehouse; X. Yun Xu; David N. Firmin

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
672 KB
Volume
34
Category
Article
ISSN
1053-1807

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Purpose:

To evaluate the feasibility of using un‐gated, real‐time MRI for venous blood velocity mapping in the calf, comparing an interleaved spiral k‐space sequence (ISP) against a standard segmented gradient echo sequence (GRE).

Materials and Methods:

A flow phantom with a variable flow‐rate was scanned using both GRE and ISP sequences for an in vitro comparison. Seven subjects were scanned prone, performing metronome guided breathing, using the (externally triggered) segmented GRE and real‐time ISP sequences. The segmented GRE acquisition duration was 2.5 mins (22 guided respiratory cycles) and the ISP sequence ran continuously for 35s, 4 full guided respiratory cycles. Mean velocity from each of the deep veins was measured and peak mean velocity, peak flow rate and cumulative volume flow over a respiratory cycle compared between sequences.

Results:

The two sequences compared well both in vitro and in vivo. The real‐time ISP sequence showed short‐term variations in mean velocity superimposed on the respiratory induced flow, which were averaged out using the segmented GRE sequence.

Conclusion:

Real‐time ISP provides comparable time‐averaged flow results to the standard sequence with additional information on real‐time flow variations and so could be used for further investigation into venous blood flow in the lower leg. J. Magn. Reson. Imaging 2011;. © 2011 Wiley‐Liss, Inc.

📜 SIMILAR VOLUMES

Effects of intravoxel velocity distribut
Effects of intravoxel velocity distributions on the accuracy of the phase-mapping method in phase-contrast MR angiography
✍ Craig A. Hamilton; Paul R. Moran; Peter Santago; II; Sarah A. Rajala 📂 Article 📅 1994 🏛 John Wiley and Sons 🌐 English ⚖ 426 KB

## Abstract The phase‐mapping method of phase‐contrast magnetic resonance angiography is shown to be based on an implicit assumption that the intravoxel velocity distribution is symmetric about its mean velocity. The effect of asymmetric distributions on the accuracy of quantitative average velocit

Accuracy and repeatability of fourier ve
Accuracy and repeatability of fourier velocity encoded M-mode and two-dimensional cine phase contrast for pulse wave velocity measurement in the descending aorta
✍ Valentina Taviani; Andrew J. Patterson; Martin J. Graves; Christopher J. Hardy; 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 348 KB

## Abstract ## Purpose: To assess the accuracy and repeatability of Fourier velocity encoded (FVE) M‐mode and two‐dimensional (2D) phase contrast with through‐plane velocity encoding (2D‐PC) for pulse wave velocity (PWV) evaluation in the descending aorta using five different analysis techniques.

Accelerated phase-contrast MR imaging: C
Accelerated phase-contrast MR imaging: Comparison of k-t BLAST with SENSE and doppler ultrasound for velocity and flow measurements in the aorta
✍ Andreas Stadlbauer; Wilma van der Riet; Sebastian Globits; Gerard Crelier; Erich 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 457 KB

## Abstract ## Purpose To evaluate differences in velocity and flow measurements in the aorta between accelerated phase‐contrast (PC) magnetic resonance imaging (MRI) using SENSE and k‐t BLAST and in peak velocity to Doppler ultrasound. ## Materials and Methods Two‐dimensional PC‐MRI perpendicul