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000272879 0247_ $$2doi$$a10.1002/mrm.30282
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000272879 1001_ $$0P:(DE-2719)9001610$$aNiesen, Svenja$$b0$$eFirst author$$udzne
000272879 245__ $$aSpiral 3DREAM sequence for fast whole‐brain B1 mapping
000272879 260__ $$aNew York, NY [u.a.]$$bWiley-Liss$$c2025
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000272879 520__ $$a This work demonstrates a new variant of the 3DREAM sequence for whole-brain B 1 + $$ {\mathrm{B}}_1^{+} $$ mapping employing a three-dimensional (3D) stack-of-spirals readout. The spiral readout reduces the echo train length after the STEAM preparation in order to overcome the significant blurring in STE* images due to the decreasing STE* signal with each excitation pulse.The 3DREAM sequence rapidly acquires two contrasts to calculate whole-brain flip angle maps. In the proposed spiral 3DREAM sequence, the Cartesian readout scheme is replaced by an accelerated 3D stack-of-spirals readout with a CAIPIRINHA sampling scheme. Phantom experiments were conducted to compare flip angle maps of the spiral 3DREAM sequence to a Cartesian 3DREAM sequence, an actual flip-angle-imaging (AFI) sequence, the dual-angle method, and the Bloch-Siegert shift method. Afterwards, the results were validated in vivo acquiring flip angle maps from five subjects.Flip angle maps of the spiral 3DREAM sequences showed high agreement with the reference methods both in phantom and in vivo experiments. Blurring in STE* images and flip angle maps was reduced compared to the Cartesian 3DREAM sequence.The spiral 3DREAM sequence utilizes a fast readout minimizing the echo train length of the imaging train. This reduces blurring in STE* images as well as the total acquisition time and increases the effective resolution of B 1 + $$ {\mathrm{B}}_1^{+} $$ maps.
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000272879 650_2 $$2MeSH$$aHumans
000272879 650_2 $$2MeSH$$aImaging, Three-Dimensional: methods
000272879 650_2 $$2MeSH$$aBrain: diagnostic imaging
000272879 650_2 $$2MeSH$$aPhantoms, Imaging
000272879 650_2 $$2MeSH$$aAlgorithms
000272879 650_2 $$2MeSH$$aMagnetic Resonance Imaging: methods
000272879 650_2 $$2MeSH$$aReproducibility of Results
000272879 650_2 $$2MeSH$$aBrain Mapping: methods
000272879 650_2 $$2MeSH$$aImage Interpretation, Computer-Assisted: methods
000272879 650_2 $$2MeSH$$aImage Enhancement: methods
000272879 7001_ $$0P:(DE-2719)2814200$$aVeldmann, Marten$$b1
000272879 7001_ $$0P:(DE-2719)2812222$$aEhses, Philipp$$b2
000272879 7001_ $$0P:(DE-2719)2810538$$aStöcker, Tony$$b3$$eLast author
000272879 773__ $$0PERI:(DE-600)1493786-4$$a10.1002/mrm.30282$$gVol. 93, no. 1, p. 321 - 329$$n1$$p321 - 329$$tMagnetic resonance in medicine$$v93$$x1522-2594$$y2025
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