Removing bias and increasing dynamic range in DREAM flip angle mapping at 7T
Helms, Gunther LU
; Olsson, Hampus
LU
and Andersen, Mads
LU
(2019)
ISMRM 27th Annual Meeting and Exhibition
In Proc Intl Soc Magn Reson Med
27.
- Abstract
- DREAM is an ultra-fast multi-slice B1+-mapping technique based on the single-shot STEAM sequence. To study noise and bias related to slice-profiles, DREAM B1+-maps at 3.75 mm resolution were acquired at 7T in phantoms and in human brain with nominal flip angles (FA) between 20° and 90° of the two STEAM preparation pulses. B1+ was decreasing at actual FAs above 50°; noise became apparent at actual FAs below 20° reducing dynamic range. By varying the preparation FA, this reliable range (20°<FA<50°) is shifted over a B1+ range from 20% to 250%. The FA map is constructed from overlapping B1+ maps after thresholding.
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/27c979e8-a052-4f24-a857-41f5084b28e9
- author
- Helms, Gunther
LU
; Olsson, Hampus
LU
and Andersen, Mads
LU
- organization
- publishing date
- 2019-04-26
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- host publication
- Removing bias and increasing dynamic range in DREAM flip angle mapping at 7T
- series title
- Proc Intl Soc Magn Reson Med
- volume
- 27
- article number
- 4500
- pages
- 3 pages
- publisher
- International Society for Magnetic Resonance in Medicine
- conference name
- ISMRM 27th Annual Meeting and Exhibition
- conference location
- Montreal, Canada
- conference dates
- 2019-05-11 - 2019-05-16
- ISSN
- 1545-4428
- project
- Multiparametric mapping of the brain at 7T using gradient echoes
- language
- English
- LU publication?
- yes
- id
- 27c979e8-a052-4f24-a857-41f5084b28e9
- alternative location
- https://index.mirasmart.com/ISMRM2019/PDFfiles/4500.html
- date added to LUP
- 2019-04-02 12:15:40
- date last changed
- 2025-04-04 14:54:42
@inproceedings{27c979e8-a052-4f24-a857-41f5084b28e9,
abstract = {{DREAM is an ultra-fast multi-slice B1+-mapping technique based on the single-shot STEAM sequence. To study noise and bias related to slice-profiles, DREAM B1+-maps at 3.75 mm resolution were acquired at 7T in phantoms and in human brain with nominal flip angles (FA) between 20° and 90° of the two STEAM preparation pulses. B1+ was decreasing at actual FAs above 50°; noise became apparent at actual FAs below 20° reducing dynamic range. By varying the preparation FA, this reliable range (20°<FA<50°) is shifted over a B1+ range from 20% to 250%. The FA map is constructed from overlapping B1+ maps after thresholding.}},
author = {{Helms, Gunther and Olsson, Hampus and Andersen, Mads}},
booktitle = {{Removing bias and increasing dynamic range in DREAM flip angle mapping at 7T}},
issn = {{1545-4428}},
language = {{eng}},
month = {{04}},
publisher = {{International Society for Magnetic Resonance in Medicine}},
series = {{Proc Intl Soc Magn Reson Med}},
title = {{Removing bias and increasing dynamic range in DREAM flip angle mapping at 7T}},
url = {{https://index.mirasmart.com/ISMRM2019/PDFfiles/4500.html}},
volume = {{27}},
year = {{2019}},
}