Quantitation of Venous Blood Flow in Gravity MRI: A Phantom Study

DOI Open Access
  • OHNO Naoki
    Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University
  • MIYATI Tosiaki
    Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University
  • HIRAMATSU Yuki
    Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University
  • YAMASAKI Minami
    Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University

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Abstract

<p>This study aimed to validate the quantitation of venous blood flow in gravity magnetic resonance imaging （MRI）using a flow phantom. The phantom consisted of a pressure tube, which simulated a venous vessel, and a programmable pump. The pump produced a steady flow of a 40% v/v glycerin-water solution with different flow velocities （2.5, 5.0, 10, 20, or 40 cm/s）through the simulated vessel. Electrocardiograph-triggered phase-contrast（PC）MRI was performed using a 0.4-T gravity MRI system, and the imaging plane was set to be perpendicular to the flow direction. In total, 17 pairs of magnitude and velocity-mapped phase images per simulated cardiac cycle were reconstructed for each flow velocity. We placed a region of interest in the simulated vessel, determined the flow velocity for each cardiac phase and mean flow rate in all phases, and compared them with the actual flow velocity and rate defined by the pump. Generally,the flow velocities were consistent with the actual ones. Moreover, the mean flow rate highly correlated with the actual rate. PC-MRI in gravity MRI makes it possible to quantify venous blood flow, thereby facilitating the investigations into the effect of gravity on venous blood flow in humans.</p>

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