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Journal of Cardiovascular Magnetic Resonance

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Open Access 01-12-2014 | Technical notes

Analysis of temperature dependence of background phase errors in phase-contrast cardiovascular magnetic resonance

Authors: Julia Busch, S Johanna Vannesjo, Christoph Barmet, Klaas P Pruessmann, Sebastian Kozerke

Published in: Journal of Cardiovascular Magnetic Resonance | Issue 1/2014

Abstract

Background

The accuracy of phase-contrast cardiovascular magnetic resonance (PC-CMR) can be compromised by background phase errors. It is the objective of the present work to provide an analysis of the temperature dependence of background phase errors in PC-CMR by means of gradient mount temperature sensing and magnetic field monitoring.

Methods

Background phase errors were measured for various temperatures of the gradient mount using magnetic field monitoring and validated in a static phantom. The effect of thermal changes during k-space acquisition was simulated and confirmed with measurements in a stationary phantom.

Results

The temperature of the gradient mount was found to increase by 20–30 K during PC-CMR measurements of 6–12 min duration. Associated changes in background phase errors of up to 11% or 0.35 radian were measured at 10 cm from the magnet’s iso-center as a result of first order offsets. Zeroth order phase errors exhibited little thermal dependence.

Conclusions

It is concluded that changes in gradient mount temperature significantly modify background phase errors during PC-CMR with high gradient duty cycle. Since temperature increases significantly during the first minutes of scanning the results presented are also of relevance for single-slice or multi-slice PC-CMR scans. The findings prompt for further studies to investigate advanced correction methods taking into account gradient temperature and/or the use of concurrent field-monitoring to map gradient-induced fields throughout the scan.

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Title: Analysis of temperature dependence of background phase errors in phase-contrast cardiovascular magnetic resonance
Authors: Julia Busch
S Johanna Vannesjo
Christoph Barmet
Klaas P Pruessmann
Sebastian Kozerke
Publication date: 01-12-2014
Publisher: BioMed Central
Published in: Journal of Cardiovascular Magnetic Resonance / Issue 1/2014
Electronic ISSN: 1532-429X
DOI: https://doi.org/10.1186/s12968-014-0097-6

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Analysis of temperature dependence of background phase errors in phase-contrast cardiovascular magnetic resonance

Abstract

Background

Methods

Results

Conclusions

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Background

Methods

Results

Conclusions

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