Keywords: Arterial Spin Labelling, Pulse Sequence Design
Motivation: Comprehensively characterizing cerebrovascular events including dynamic blood flow patterns and downstream perfusion is important in clinical diagnosis of cerebrovascular disorders.
Goal(s): To develop a time-efficient ASL technique that provides high-quality time-resolved 4D-MRA and perfusion imaging within a single scan.
Approach: A new sequence was designed combining pCASL and PASL preparations with stack-of-stars (SOS) golden-angle radial acquisition. By applying a Hadamard encoding matrix, the label and control pulse modules alternated between pCASL and PASL preparations in each TR. The final 4D-MRA and perfusion maps are decoded with paired subtraction.
Results: Both dynamic 4D-MRA and high-quality perfusion maps were successfully obtained from the proposed method.
Impact: The developed dual-ASL technique could be a potentially powerful imaging tool in clinical applications, which provides a detailed characterization of flow hemodynamics from both arterial and capillary beds by a single scan.
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