Breathhold inhance inflow IR (BH-IFIR) with a novel 3D recessed fan beam view ordering

Introduction: The combination of arterial spin labeling technique with 3D balanced SSFP (b-SSFP) sequence for data acquisition has been recently used for non-contrast MR Angiography (MRA) in the body . Commonly, a respiratory-gated scan with bellows or navigator gating to detect diaphragmatic shift is performed with a segmented view ordering scheme. However, motion artifacts cannot be avoided in patients with irregular breathing. The data acquisition window is fixed to preserve image contrast, which is determined by the center of k-space with conventional k-space view ordering schemes such as sequential and centric view ordering. In these schemes, the number of segments is usually high, leading to long scan times. The purpose of this study was to develop a breath-hold sequence with a novel and efficient 3D recessed fan beam multi-segmented view ordering scheme.