The challenge of bias-free coil combination for quantitative susceptibility mapping at ultra-high field
Authors: Bollmann, S., Robinson, S.D., O'Brien, K., Vegh, V., Janke, A., Marstaller, L., Reutens, D. and Barth, M.
Journal: Magnetic Resonance in Medicine
Volume: 79
Issue: 1
Pages: 97-107
eISSN: 1522-2594
ISSN: 0740-3194
DOI: 10.1002/mrm.26644
Abstract:Purpose: Quantitative susceptibility mapping is a technique to estimate the magnetic property of tissue with particularly high sensitivity at ultra-high field. However, a key challenge at ultra-high field is the combination of phase data acquired using phased array receive coils. Several methods for combining phase data have been proposed, but the influence of coil combination choices on susceptibility quantitation has not been studied systematically. Methods: We combined phase data using COMPOSER (COMbining Phase data using a Short Echo-time Reference scan) and a reference-free channel-by-channel method. We investigated the effect of the chosen combination method on susceptibility results in a group of 28 participants at 7 Tesla. Results: Our results show that reference scans can bias susceptibility values. Although the proposed reference-free channel-by-channel method cannot remove transmit field phase, it shows comparable results to the COMPOSER method in which a high-resolution ultrashort echo-time reference scan was used. Conclusions: We conclude that ultrashort echo-time reference scans reduce quantitation bias and remove the transmit field phase when using COMPOSER to combine phase data, and not combining the phase data before susceptibility processing avoids this bias, resulting in comparable results. Magn Reson Med 79:97–107, 2018. © 2017 InternationalSociety for Magnetic Resonance in Medicine.
Source: Scopus
The challenge of bias-free coil combination for quantitative susceptibility mapping at ultra-high field.
Authors: Bollmann, S., Robinson, S.D., O'Brien, K., Vegh, V., Janke, A., Marstaller, L., Reutens, D. and Barth, M.
Journal: Magn Reson Med
Volume: 79
Issue: 1
Pages: 97-107
eISSN: 1522-2594
DOI: 10.1002/mrm.26644
Abstract:PURPOSE: Quantitative susceptibility mapping is a technique to estimate the magnetic property of tissue with particularly high sensitivity at ultra-high field. However, a key challenge at ultra-high field is the combination of phase data acquired using phased array receive coils. Several methods for combining phase data have been proposed, but the influence of coil combination choices on susceptibility quantitation has not been studied systematically. METHODS: We combined phase data using COMPOSER (COMbining Phase data using a Short Echo-time Reference scan) and a reference-free channel-by-channel method. We investigated the effect of the chosen combination method on susceptibility results in a group of 28 participants at 7 Tesla. RESULTS: Our results show that reference scans can bias susceptibility values. Although the proposed reference-free channel-by-channel method cannot remove transmit field phase, it shows comparable results to the COMPOSER method in which a high-resolution ultrashort echo-time reference scan was used. CONCLUSIONS: We conclude that ultrashort echo-time reference scans reduce quantitation bias and remove the transmit field phase when using COMPOSER to combine phase data, and not combining the phase data before susceptibility processing avoids this bias, resulting in comparable results. Magn Reson Med 79:97-107, 2018. © 2017 InternationalSociety for Magnetic Resonance in Medicine.
Source: PubMed
The challenge of bias-free coil combination for quantitative susceptibility mapping at ultra-high field
Authors: Bollmann, S., Robinson, S.D., O'Brien, K., Vegh, V., Janke, A., Marstaller, L., Reutens, D. and Barth, M.
Journal: MAGNETIC RESONANCE IN MEDICINE
Volume: 79
Issue: 1
Pages: 97-107
eISSN: 1522-2594
ISSN: 0740-3194
DOI: 10.1002/mrm.26644
Source: Web of Science (Lite)
The challenge of bias-free coil combination for quantitative susceptibility mapping at ultra-high field.
Authors: Bollmann, S., Robinson, S.D., O'Brien, K., Vegh, V., Janke, A., Marstaller, L., Reutens, D. and Barth, M.
Journal: Magnetic resonance in medicine
Volume: 79
Issue: 1
Pages: 97-107
eISSN: 1522-2594
ISSN: 0740-3194
DOI: 10.1002/mrm.26644
Abstract:Purpose
Quantitative susceptibility mapping is a technique to estimate the magnetic property of tissue with particularly high sensitivity at ultra-high field. However, a key challenge at ultra-high field is the combination of phase data acquired using phased array receive coils. Several methods for combining phase data have been proposed, but the influence of coil combination choices on susceptibility quantitation has not been studied systematically.Methods
We combined phase data using COMPOSER (COMbining Phase data using a Short Echo-time Reference scan) and a reference-free channel-by-channel method. We investigated the effect of the chosen combination method on susceptibility results in a group of 28 participants at 7 Tesla.Results
Our results show that reference scans can bias susceptibility values. Although the proposed reference-free channel-by-channel method cannot remove transmit field phase, it shows comparable results to the COMPOSER method in which a high-resolution ultrashort echo-time reference scan was used.Conclusions
We conclude that ultrashort echo-time reference scans reduce quantitation bias and remove the transmit field phase when using COMPOSER to combine phase data, and not combining the phase data before susceptibility processing avoids this bias, resulting in comparable results. Magn Reson Med 79:97-107, 2018. © 2017 InternationalSociety for Magnetic Resonance in Medicine.Source: Europe PubMed Central