English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Increasing robustness of radial GRASE acquisition for SAR-reduced brain imaging

Okanovic, M., Völker, M., Trampel, R., Breuer, F., Jakob, P., & Blaimer, M. (2018). Increasing robustness of radial GRASE acquisition for SAR-reduced brain imaging. Zeitschrift für Medizinische Physik, 28(3), 236-246. doi:10.1016/j.zemedi.2018.02.004.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/21.11116/0000-0001-2160-D Version Permalink: http://hdl.handle.net/21.11116/0000-0003-75B5-D
Genre: Journal Article
Other : Verbesserung der Bildqualität bei der radialen GRASE Sequenz für die SAR-reduzierte Neuro-Bildgebung

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Okanovic, Melisa1, Author
Völker, Michael1, Author
Trampel, Robert2, Author              
Breuer, Felix3, Author
Jakob, Peter1, Author
Blaimer, Martin3, Author
Affiliations:
1Department of Experimental Physics V, Julius Maximilian University, Würzburg, Germany, ou_persistent22              
2Department Neurophysics (Weiskopf), MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_2205649              
3Fraunhofer Institute for Integrated Circuits (IIS), Würzburg, Germany, ou_persistent22              

Content

show
hide
Free keywords: SAR; High-resolution; Radial imaging; TSE
 Abstract: Purpose To improve a radial multi-slice 2D gradient- and spin-echo (GRASE) sequence and provide an appropriate image reconstruction technique for SAR-reduced high-resolution neuroimaging. Methods Additional readout gradients per radio-frequency (RF) refocusing allow for a reduced number of RF pulses. In this way, a specific absorption rate (SAR) reduction is achieved and the application at high-field systems becomes more feasible. A phase insensitive image reconstruction is proposed to reduce signal dropout artifacts originating from opposite readout polarities. In addition, the image reconstruction allows for the calculation of images with varying contrast from one measurement. Results Results obtained at 3 T and 7 T demonstrate a SAR-reduction of at least 66% for a single-slice experiment with radial GRASE. The reduced SAR is used for an increased spatial coverage without increasing the measurement time. Experiments at 3 T and 7 T showed that the visual image quality is comparable to standard TSE and GRASE sequences with the same measurement parameters. Using higher EPI factors and the presented image reconstruction, artifact-free images with a significant SAR-reduction can be achieved. Conclusion Radial GRASE enables SAR-reduced acquisitions of high-resolution brain images with different contrasts from one measurement and is a promising sequence for high-field neuroimaging.

Details

show
hide
Language(s): eng - English
 Dates: 2017-07-272018-02-282018-03-232018-08
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.zemedi.2018.02.004
PMID: 29580616
Other: Epub 2018
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Zeitschrift für Medizinische Physik
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Jena [Germany] : Urban & Fischer
Pages: - Volume / Issue: 28 (3) Sequence Number: - Start / End Page: 236 - 246 Identifier: ISSN: 0939-3889
CoNE: https://pure.mpg.de/cone/journals/resource/110978984077161