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

Helms, Gunther LU orcid ; Lätt, Jimmy LU and Olsson, Hampus LU (2020) In Acta Scientiarum Lundensia 2020(001). p.1-12
Abstract
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,... (More)
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. (Less)
Abstract (Swedish)
Abstrakt. Ett etablerat MP2RAGE-protokoll för semikvantitativ strukturell hjärn-MRI överfördes från
en 7T MR-skanner till en annan leverantör med jämförbar hårdvara, men motsatt polaritet. På det här
systemet, kan skanningstiden reduceras från 11 till 8 minuter genom elliptisk k-space-sampling. Tre konfigurationer
av radiofrekvens (RF) överföring jämfördes (enkelkanal med kvadraturen slits, två och åtta
kanaler med fast fasförseningar). Databehandling för offline-beräkning MP2RAGE-bilder beskrivs i detalj.
DICOM-skalningen av skanner B medför en förlust av precision och noggrannhet och starkare artefakter i lågregioner
RF-fält, som kan förbättras med dielektriska dynor. För jämförelse och multisitestudier använder... (More)
Abstrakt. Ett etablerat MP2RAGE-protokoll för semikvantitativ strukturell hjärn-MRI överfördes från
en 7T MR-skanner till en annan leverantör med jämförbar hårdvara, men motsatt polaritet. På det här
systemet, kan skanningstiden reduceras från 11 till 8 minuter genom elliptisk k-space-sampling. Tre konfigurationer
av radiofrekvens (RF) överföring jämfördes (enkelkanal med kvadraturen slits, två och åtta
kanaler med fast fasförseningar). Databehandling för offline-beräkning MP2RAGE-bilder beskrivs i detalj.
DICOM-skalningen av skanner B medför en förlust av precision och noggrannhet och starkare artefakter i lågregioner
RF-fält, som kan förbättras med dielektriska dynor. För jämförelse och multisitestudier använder man en identisk skanning
protokoll och identisk RF-hårdvara rekommenderas.


(Less)
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author
; and
organization
alternative title
Överföring mellan olika leverantörer och RF-spolejämförelse av ett högupplöst MP2RAGE-protokoll för hjärnavbildning vid 7T
publishing date
type
Contribution to journal
publication status
published
subject
keywords
quantitative MRI, Structural imaging, T1 relaxation, brain, ultra-high field, signal scaling, quantitative MRI, structural imagin, T1 relaxatio, brai, ultra-high field, signal scaling
in
Acta Scientiarum Lundensia
volume
2020
issue
001
article number
2020-001
pages
1 - 12
publisher
Bertil RR Persson, Medical Radiation Physics, 22185 Lund, Sweden
ISSN
1651-5013
language
English
LU publication?
yes
additional info
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,
id
4ca64c5a-1c19-418b-a911-b7000474c0da
date added to LUP
2020-05-12 12:09:48
date last changed
2022-04-05 10:38:38
@article{4ca64c5a-1c19-418b-a911-b7000474c0da,
  abstract     = {{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.}},
  author       = {{Helms, Gunther and Lätt, Jimmy and Olsson, Hampus}},
  issn         = {{1651-5013}},
  keywords     = {{quantitative MRI; Structural imaging; T1 relaxation; brain; ultra-high field; signal scaling; quantitative MRI; structural imagin; T1 relaxatio; brai; ultra-high field; signal scaling}},
  language     = {{eng}},
  month        = {{05}},
  number       = {{001}},
  pages        = {{1--12}},
  publisher    = {{Bertil RR Persson, Medical Radiation Physics, 22185 Lund, Sweden}},
  series       = {{Acta Scientiarum Lundensia}},
  title        = {{Cross-vendor transfer and RF coil comparison of a high-resolution MP2RAGE protocol for brain imaging at 7T}},
  url          = {{https://lup.lub.lu.se/search/files/79469556/ASL_2020_1_Helms_version3.pdf}},
  volume       = {{2020}},
  year         = {{2020}},
}