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Modified acquisition strategy for reduced motion artifact in super resolution T 2 FSE multislice MRI: Application to prostate
Author(s) -
Kargar Soudabeh,
Borisch Eric A.,
Froemming Adam T.,
Grimm Roger C.,
Kawashima Akira,
King Bernard F.,
Stinson Eric G.,
Riederer Stephen J.
Publication year - 2020
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.28315
Subject(s) - artifact (error) , multislice , sagittal plane , computer science , computer vision , magnetic resonance imaging , data acquisition , artificial intelligence , nuclear medicine , medicine , radiology , operating system
Purpose To reduce slice‐to‐slice motion effects in multislice T 2 ‐weighted fast‐spin‐echo ( T 2 FSE) imaging, manifest as “scalloping” in reformats, by modification of the acquisition strategy and to show applicability in prostate MRI. MethodsT 2 FSE images of contiguous or overlapping slices are typically acquired using multiple passes in which each pass is comprised of multiple slices with slice‐to‐slice gaps. Combination of slices from all passes provides the desired sampling. For enhancement of through‐plane resolution with super resolution or for reformatting into other orientations, subtle ≈1 mm motion between passes can cause objectionable “scalloping” artifact. Here we address this by subdivision of each pass into multiple segments. Interleaving of segments from the multiple passes causes all slices to be acquired over substantially the same time, reducing pass‐to‐pass motion effects. This was implemented in acquiring 78 overlapped T 2 FSE axial slices and studied in phantoms and in 14 prostate MRI patients. Super‐resolution axial images and sagittal reformats from the original and new segmented acquisitions were evaluated by 3 uroradiologists. Results For all criteria of sagittal reformats, the segmented acquisition was statistically superior to the original. For all sharpness criteria of axial images, although the trend preferred the original acquisition, the difference was not significant. For artifact in axial images, the segmented acquisition was significantly superior. Conclusions For prostate MRI the new segmented acquisition significantly reduces the scalloping motion artifact that can be present in reformats due to long time lags between the acquisition of adjacent or overlapped slices while retaining image sharpness in the acquired axial slices.