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Reducing view-sharing using compressed sensing in time-resolved contrast-enhanced magnetic resonance angiography

Abstract : PURPOSE: To study temporal and spatial blurring artifacts from k-space view-sharing in time-resolved MR angiography (MRA) and to propose a technique for reducing these artifacts. METHODS: We acquired k-space data sets using a three-dimensional time-resolved MRA view-sharing sequence and retrospectively reformatted them into two reconstruction frameworks: full view-sharing via time-resolved imaging with stochastic trajectories (TWIST) and minimal k-space view-sharing and compressed sensing (CS-TWIST). The two imaging series differed in temporal footprint but not in temporal frame rate. The artifacts from view-sharing were compared qualitatively and quantitatively in nine patients in addition to a phantom experiment. RESULTS: CS-TWIST was able to reduce the imaging temporal footprint by two- to three-fold compared with TWIST, and the overall subjective image quality of CS-TWIST was higher than that for TWIST (P \textless 0.05). View sharing caused a delay in the visualization of small blood vessels, and the mean transit time of the carotid artery calculated based on TWIST reconstruction was 0.6 s longer than that for CS-TWIST (P \textless 0.01). In thoracic MRA, the shorter temporal footprint decreased the sensitivity to physiological motion blurring, and vessel sharpness was improved by 8.8% ± 6.0% using CS-TWIST (P \textless 0.05). CONCLUSION: In time-resolved MRA, the longer temporal footprint due to view-sharing causes spatial and temporal artifacts. CS-TWIST is a promising method for reducing these artifacts. Magn Reson Med 74:474-481, 2015. © 2014 Wiley Periodicals, Inc.
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Submitted on : Monday, December 12, 2016 - 11:38:40 AM
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Stanislas Rapacchi, Yutaka Natsuaki, Adam Plotnik, Simon Gabriel, Gerhard Laub, et al.. Reducing view-sharing using compressed sensing in time-resolved contrast-enhanced magnetic resonance angiography. Magnetic Resonance in Medicine, Wiley, 2015, 74 (2), pp.474--481. ⟨10.1002/mrm.25414⟩. ⟨hal-01414339⟩



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