Cross-vendor transfer and RF coil comparison of a high-resolution MP2RAGE protocol for brain imaging at 7T

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T1 - Cross-vendor transfer and RF coil comparison of a high-resolution MP2RAGE protocol for brain imaging at 7T

AU - Helms, Gunther

AU - Lätt, Jimmy

AU - Olsson, Hampus

N1 - G.H. was funded by Swedish Research Council (NT 2014-6193). The reference MP2RAGE protocol was kindly provided by Dr. Robert Trampel, Max-Planck-Institute for Human Cognition and Brain Sciences, Leipzig, Germany. Lund University Bioimaging Center (LBIC) is acknowledged for experimental resources (equipment grant VR RFI 829-2010-5928). Reviewer: Benedikt Poser, Maastricht University,

PY - 2020/5/12

Y1 - 2020/5/12

N2 - Abstract. An established MP2RAGE protocol for semi-quantitative structural brain MRI was transferred from one 7T MR scanner to that of another vendor featuring comparable hardware, but opposite polarity. On this system, the scan time could be reduced from 11 to 8 minutes by elliptical k-space sampling. Three configurations of radio-frequency (RF) transmission were compared (single channel with quadrature slitting, two and eight channels of fixed phase delays). Data processing for offline calculation MP2RAGE images is described in detail. The DICOM scaling of scanner B entails a loss of precision and accuracy and stronger artifacts in regions of low RF field, which can be improved by dielectric pads. For comparison and multi-site studies, though, use of an identical scan protocol and identical RF hardware is recommended.

AB - Abstract. An established MP2RAGE protocol for semi-quantitative structural brain MRI was transferred from one 7T MR scanner to that of another vendor featuring comparable hardware, but opposite polarity. On this system, the scan time could be reduced from 11 to 8 minutes by elliptical k-space sampling. Three configurations of radio-frequency (RF) transmission were compared (single channel with quadrature slitting, two and eight channels of fixed phase delays). Data processing for offline calculation MP2RAGE images is described in detail. The DICOM scaling of scanner B entails a loss of precision and accuracy and stronger artifacts in regions of low RF field, which can be improved by dielectric pads. For comparison and multi-site studies, though, use of an identical scan protocol and identical RF hardware is recommended.

KW - quantitative MRI

KW - Structural imaging

KW - T1 relaxation

KW - brain

KW - ultra-high field

KW - signal scaling

KW - quantitative MRI

KW - structural imagin

KW - T1 relaxatio

KW - brai

KW - ultra-high field

KW - signal scaling

M3 - Article

VL - 2020

SP - 1

EP - 12

JO - Acta Scientiarum Lundensia

JF - Acta Scientiarum Lundensia

SN - 1651-5013

IS - 001

M1 - 2020-001

ER -