Effect of head motion on MRI B0 field distribution

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
Jiaen LiuJeff Duyn

Abstract

To identify and characterize the sources of B0 field changes due to head motion, to reduce motion sensitivity in human brain MRI. B0 fields were measured in 5 healthy human volunteers at various head poses. After measurement of the total field, the field originating from the subject was calculated by subtracting the external field generated by the magnet and shims. A subject-specific susceptibility model was created to quantify the contribution of the head and torso. The spatial complexity of the field changes was analyzed using spherical harmonic expansion. Minor head pose changes can cause substantial and spatially complex field changes in the brain. For rotations and translations of approximately 5 º and 5 mm, respectively, at 7 T, the field change that is associated with the subject's magnetization generates a standard deviation (SD) of about 10 Hz over the brain. The stationary torso contributes to this subject-associated field change significantly with a SD of about 5 Hz. The subject-associated change leads to image-corrupting phase errors in multi-shot <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow><mml:msubsup><mml:mi>T</mml:mi> <mml:mn>2</mml:mn> <mml:mo>*</mml:mo></mml:msubsup> </mml:mrow> </mml:m...Continue Reading

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Citations

Aug 30, 2019·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Tess E WallaceSimon K Warfield
Feb 14, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·João JorgeMeritxell Bach Cuadra
Sep 17, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Caroline Le SterNicolas Boulant
Sep 25, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Tess E WallaceOnur Afacan
Jun 30, 2019·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Xin MiaoJohn C Wood
Oct 23, 2020·NMR in Biomedicine·Ovidiu C AndronesiAndré van der Kouwe
Mar 8, 2020·NeuroImage·Yicun WangJeff H Duyn
Apr 6, 2021·Current Opinion in Behavioral Sciences·Olivia Viessmann, Jonathan R Polimeni
Jun 3, 2021·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Johan BerglundStefan Skare
Aug 15, 2021·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Daniel PolakStephen Cauley
Dec 28, 2021·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Alix PlumleyEmre Kopanoglu

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