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Magn Reson Med. 2018 Feb;79(2):867-878. doi: 10.1002/mrm.26747. Epub 2017 May 7.

Accelerated noncontrast-enhanced 4-dimensional intracranial MR angiography using golden-angle stack-of-stars trajectory and compressed sensing with magnitude subtraction.

Author information

1
Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, California, USA.
2
Department of Bioengineering, University of California, Los Angeles, California, USA.
3
Department of Neurology, University of California, Los Angeles, California, USA.
4
Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.
5
Department of Radiology, University of Pennsylvania Medical Center, Philadelphia, Pennsylvania, USA.
6
Laboratory of Functional MRI Technology, Stevens Neuroimaging and Informatics Institute, Keck School of Medicine, University of Southern California, Los Angeles, California, USA.

Abstract

PURPOSE:

To evaluate the feasibility and performance of compressed sensing (CS) with magnitude subtraction regularization in accelerating non-contrast-enhanced dynamic intracranial MR angiography (NCE-dMRA).

METHODS:

A CS algorithm was introduced in NCE-dMRA by exploiting the sparsity of the magnitude difference of the control and label images. The NCE-dMRA data were acquired using golden-angle stack-of-stars trajectory on six healthy volunteers and one patient with arteriovenous fistula. Images were reconstructed using (i) the proposed magnitude-subtraction CS (MS-CS); (ii) complex-subtraction CS; (iii) independent CS; and (iv) view-sharing with k-space weighted image contrast (KWIC). The dMRA image quality was compared across the four reconstruction strategies. The proposed MS-CS method was further compared with KWIC for temporal fidelity of depicting dynamic flow.

RESULTS:

The proposed MS-CS method was able to reconstruct NCE-dMRA images with detailed vascular structures and clean background. It provided better subjective image quality than the other two CS strategies (P < 0.05). Compared with KWIC, MS-CS showed similar image quality, but reduced temporal blurring in delineating the fine distal arteries.

CONCLUSIONS:

The MS-CS method is a promising CS technique for accelerating NCE-dMRA acquisition without compromising image quality and temporal fidelity. Magn Reson Med 79:867-878, 2018. © 2017 International Society for Magnetic Resonance in Medicine.

KEYWORDS:

KWIC; arterial spin labeling; compressed sensing; magnitude subtraction; noncontrast MR angiography; view sharing

PMID:
28480537
PMCID:
PMC5675831
DOI:
10.1002/mrm.26747
[Indexed for MEDLINE]
Free PMC Article

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