EPI distortion correction from a simultaneously acquired distortion map using TRAIL

Journal of Magnetic Resonance Imaging : JMRI
Andrew N PriestR J Ordidge

Abstract

To develop a method for shot-by-shot distortion correction of single-shot echo-planar imaging (EPI) that is capable of correcting each image individually using a distortion measurement performed during acquisition of the image itself. The recently-introduced method known as two reduced acquisitions interleaved (TRAIL) was extended to measure the distribution of the main magnetic field B0 with each shot. This corresponded to a map of distortion, and allowed distortion to be corrected in the acquired images. Distortion-corrected images were demonstrated in the human brain. The distortion field could be directly visualized using the "stripe" distribution imposed by the TRAIL pulse sequence. This confirmed the success of the correction. Over a time-course measurement of 10 images, variance was reduced by using shot-by-shot distortion correction compared to correction with a constant field map. Shot-by-shot distortion correction may be performed for EPI images acquired using an extension of the TRAIL technique, ensuring that the correction reflects the actual distortion pattern and not merely a previously measured, but possibly no longer valid, distortion field. This avoids errors due to changes in the distortion field or misregistr...Continue Reading

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Citations

Mar 9, 2007·Nihon Hoshasen Gijutsu Gakkai zasshi·Isao MuroTomohiko Horie
Dec 17, 2014·Magnetic Resonance in Medical Sciences : MRMS : an Official Journal of Japan Society of Magnetic Resonance in Medicine·Toshiya AzumaKatsutoshi Murata
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Jul 7, 2015·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Rahul P Dewal, Qing X Yang
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Aug 2, 2012·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Eelke VisserMarcel P Zwiers
Mar 5, 2021·Journal of Computer Assisted Tomography·Ruth P LimEric E Sigmund

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