%0 Journal Article %T Real-time phase contrast MRI versus conventional phase contrast MRI at different spatial resolutions and velocity encodings %+ CHirurgie, IMagerie et REgénération tissulaire de l’extrémité céphalique - Caractérisation morphologique et fonctionnelle - UR UPJV 7516 (CHIMERE) %A Liu, Pan %A Fall, Sidy %A Ahiatsi, Maureen %A Balédent, Olivier %< avec comité de lecture %@ 0899-7071 %J Clinical Imaging %I Elsevier %V 94 %P 93-102 %8 2023-02 %D 2023 %R 10.1016/j.clinimag.2022.11.015 %K Cine MRI %K Echo-planar imaging %K Imaging phantom %K Phase-contrast %K Pulsatile flow %Z Life Sciences [q-bio]/Human health and pathologyJournal articles %X Purposes: To compare the accuracy of real-time phase-contrast echo-planar MRI (EPI-PC) and conventional cine phase-contrast MRI (Conv-PC) and to assess the influence of spatial resolutions (pixel size) and velocity encoding on flow measurements obtained with the two sequences.Methods: Flow quantification was assessed using a pulsatile flow phantom (diameter: 9.5 mm; mean flow rate: 1150 mm3/s; mean flow velocity: 1.6 cm/s). Firstly, the accuracy of the EPI-PC was checked by comparing it with the flow rate in the calibrated phantom and the pulsation index from Conv-PC. Secondly, flow data from the two sequences were compared quantitatively as a function of the pixel size and the velocity encoding.Results: The mean percentage difference between the EPI-PC flow rate and calibrated phantom flow rate was -2.9 ± 2.1% (Mean ± SD). The pulsatility indices for EPI-PC and Conv-PC were respectively 0.64 and 0.59. In order to keep the flow rate measurement error within 10%, the ROI in Conv-PC had to contain at least 13 pixels, while the ROI in EPI-PC had to contain at least 9 pixels. Furthermore, Conv-PC had a higher velocity-to-noise ratio and could use a higher velocity encoding than EPI-PC (20 cm/s and 15 cm/s, respectively).Conclusions: The result of this in vitro study confirmed the accuracy of EPI-PC, and found that EPI-PC can adapt to lower spatial resolutions, but is more sensitive to velocity encoding than Conv-PC. %G English %L hal-03901272 %U https://u-picardie.hal.science/hal-03901272 %~ UNIV-PICARDIE %~ U-PICARDIE %~ CHIMERE