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BMC Medical Imaging
Published in: BMC Medical Imaging 1/2015

Open Access 01-12-2015 | Research article

Whole-heart four-dimensional flow can be acquired with preserved quality without respiratory gating, facilitating clinical use: a head-to-head comparison

Authors: Mikael Kanski, Johannes Töger, Katarina Steding-Ehrenborg, Christos Xanthis, Karin Markenroth Bloch, Einar Heiberg, Marcus Carlsson, Håkan Arheden

Published in: BMC Medical Imaging | Issue 1/2015

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Abstract

Background

Respiratory gating is often used in 4D-flow acquisition to reduce motion artifacts. However, gating increases scan time. The aim of this study was to investigate if respiratory gating can be excluded from 4D flow acquisitions without affecting quantitative intracardiac parameters.

Methods

Eight volunteers underwent CMR at 1.5 T with a 5-channel coil (5ch). Imaging included 2D flow measurements and whole-heart 4D flow with and without respiratory gating (Resp(+), Resp(−)). Stroke volume (SV), particle-trace volumes, kinetic energy, and vortex-ring volume were obtained from 4D flow-data. These parameters were compared between 5ch Resp(+) and 5ch Resp(−). In addition, 20 patients with heart failure were scanned using a 32-channel coil (32ch), and particle-trace volumes were compared to planimetric SV. Paired comparisons were performed using Wilcoxon’s test and correlation analysis using Pearson r. Agreement was assessed as bias ± SD.

Results

Stroke volume from 4D flow was lower compared to 2D flow both with and without respiratory gating (5ch Resp(+) 88 ± 18 vs 97 ± 24.0, p = 0.001; 5ch Resp(−) 86 ± 16 vs 97.1 ± 22.7, p < 0.01). There was a good correlation between Resp(+) and Resp(−) for particle-trace derived volumes (R2 = 0.82, 0.2 ± 9.4 ml), mean kinetic energy (R2 = 0.86, 0.07 ± 0.21 mJ), peak kinetic energy (R2 = 0.88, 0.14 ± 0.77 mJ), and vortex-ring volume (R2 = 0.70, −2.5 ± 9.4 ml). Furthermore, good correlation was found between particle-trace volume and planimetric SV in patients for 32ch Resp(−) (R2 = 0.62, −4.2 ± 17.6 ml) and in healthy volunteers for 5ch Resp(+) (R2 = 0.89, −11 ± 7 ml), and 5ch Resp(−) (R2 = 0.93, −7.5 ± 5.4 ml), Average scan duration for Resp(−) was shorter compared to Resp(+) (27 ± 9 min vs 61 ± 19 min, p < 0.05).

Conclusions

Whole-heart 4D flow can be acquired with preserved quantitative results without respiratory gating, facilitating clinical use.
Appendix
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Metadata
Title
Whole-heart four-dimensional flow can be acquired with preserved quality without respiratory gating, facilitating clinical use: a head-to-head comparison
Authors
Mikael Kanski
Johannes Töger
Katarina Steding-Ehrenborg
Christos Xanthis
Karin Markenroth Bloch
Einar Heiberg
Marcus Carlsson
Håkan Arheden
Publication date
01-12-2015
Publisher
BioMed Central
Published in
BMC Medical Imaging / Issue 1/2015
Electronic ISSN: 1471-2342
DOI
https://doi.org/10.1186/s12880-015-0061-4

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