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Analytical Corrections of Banding Artifacts in Driven Equilibrium Single Pulse Observation of T2 (DESPOT2)
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Analytical off-resonance corrections in DESPOT2
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- Author(s) / Creator(s)
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This is the pre-peer reviewed version of the following article: Magn Reson Med 76:1790-1804, 2016, which has been published in final form at https://doi.org/10.1002/mrm.26074. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Purpose
DESPOT2 is a single-component T2 mapping technique based on bSSFP imaging. It has seen limited application because of banding artifacts and magnetization transfer (MT) effects. In this work, acquisitions are optimized to minimize MT effects, while exact and approximate analytical equations enable automatic correction of banding artifacts within the T2 maps in mere seconds.
Methods
The technique was verified on an agar phantom at 3T. The T2 resulting from four different data combination techniques was compared to the T2 from CPMG. Two comparable DESPOT2 scan protocols (short vs. long TR/TRF) designed to minimize MT effects, were tested both in the phantom and in vivo. A third protocol was tested in the brain of 8 volunteers and analytical correction schemes were compared with DESPOT2-FM.
Results
The T2 measurements in agar agree with CPMG within ~7% and in-vivo protocol results agree with values reported in the literature. The approximate analytical solutions provide increased robustness to hardware imperfections and higher T2-to-noise ratio than the exact solutions.
Conclusions
New analytical solutions enable fast and accurate whole-brain T2 mapping from bSSFP images with a minimum of two phase offsets and two flip angles (=4 datasets, 8 min scan) and previously measured T1 and B1 maps. -
- Date created
- 2015-12-30
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- Subjects / Keywords
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- Type of Item
- Article (Published)