Non Contrast MRA of the Renal Artery: Comparison of Respiratory Triggered IFIR and ECG Gated IFIR with Autovoice Guidance for Respiration

Takayuki Masui¹, Motoyuki Katayama¹, Kimihiko Sato¹, Hiroki Ikuma¹, M Sugimura¹, M Ishii¹, Naoyuki Takei², Mitsuharu Miyoshi²

Non-contrast (NC) MRAs including inflow inversion recovery (IFIR) FIESTA have shown promising results for demonstration of the renal arteries but might show irregularity in the most peripheral parts of the renal arteries. The purpose was to evaluate effect of autovoice guiding respiratory cycle with ECG gating (IFIR with autovoice) on the quality of NC MRA for demonstration of renal arteries in comparison with contrast MRA. MRA using IFIR with autovoice could provide best image quality of the peripheral renal arteries when autovoice successfully guided respiration. Contrast MRA might miss the optimal timing for selective visualization of the renal arteries.