Model for the correction of motion-induced phase errors in multishot diffusion-weighted-MRI of the head: are cardiac-motion-induced phase errors reproducible from beat-to-beat?

Autor:	R L, O'Halloran, S, Holdsworth, M, Aksoy, R, Bammer
Rok vydání:	2011
Předmět:	Adult Male Models Statistical Cardiac-Gated Imaging Techniques Brain Reproducibility of Results Image Enhancement Magnetic Resonance Imaging Models Biological Sensitivity and Specificity Article Head Movements Image Interpretation Computer-Assisted Humans Artifacts Algorithms
Zdroj:	Magnetic resonance in medicine. 68(2)
ISSN:	1522-2594
Popis:	In diffusion-weighted imaging, multi-shot acquisitions are problematic due to inter-shot inconsistencies of the phase caused by motion during the diffusion-encoding gradients. A model for the motion-induced phase errors in DW-MRI of the brain is presented in which rigid-body and non-rigid-body motion are separated. In the model it is assumed that non-rigid-body motion is due to cardiac pulsation, and that the motion patterns are repeatable from beat to beat. To test the validity of this assumption, the repeatability of non-rigid-body motion-induced phase errors is quantified in three healthy volunteers. Non-rigid-body motion-induced phase was found to significantly correlate (p < 0.05) with pulse-oximeter waveforms in approximately 83 percent of the pixels tested across all slices and subjects.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=pmid________::7374447c08bc50f71b6ecc3df9df9f7f https://pubmed.ncbi.nlm.nih.gov/22213138 Zobrazit plný text záznamu Plný text