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Evaluation of ultrafast phase-contrast imaging in the thoracic aorta

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Abstract

Purpose: Two ultrafast phase-contrast (PC) data acquisition strategies, multishot echo-planar imaging (EPI)-PC and segmentedk-space fast gradient-echo PC (FASTCARD-PC) were evaluated with regard to their measurement accuracy.

Materials and Method: Flow measurements of the ascending and descending aorta were acquired in 10 healthy volunteers with an electrocardiogram (ECG)-triggered eight-shot EPI-PC sequence (TR/TE/flip 16/7.4/45°, 32-ms flow-phase interval, 2×2 mm in plane resolution), and FASTCARD-PC (six it-lines per band, TR/TE/flip 11/6.1/45°, 32-ms flow-phase interval, 2 × 1 mm in plane resolution). These were compared to flow-volume data acquired with conventional cine-PC (TR/TE/flip 24/7/45°, 48-ms flow-phase interval, 2 × 1 mm in plane resolution). Using cine-PC as a gold standard, the measurement accuracy of FASTCARD-PC and EPI-PC were determined.

Results: Both EPI-PC and FASTCARD-PC significantly reduced data acquisition times compared to cine PC. EPI-PC flow measurements correlated well with aortic cine-PC flow-volume determinations (r=0.98). Reflecting poorer temporal resolution, FASTCARD-PC measurements were less accurate (p<0.05), evidenced by poor correlation with cine-PC data (r=0.62).

Conclusion: Ultrafast PC measurements are possible. In contrast to the segmentedk-space PC technique, which is limited in temporal resolution, multishot EPI-PC provides high measurement accuracy in pulsatile vessels while keeping the image acquisition interval short enough for a comfortable breath-hold.

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Authors and Affiliations

  1. MRI Center, Department of Radiology, Zurich University Hospital, Zurich, Switzerland

    Jörg F. Debatin, Clarence P. Davis & Graeme C. McKinnon

  2. MRI Center, Department of Radiology, Inselspital and University Hospital Bern, Bern, Switzerland

    Jacques Felblinger

Authors
  1. Jörg F. Debatin
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  2. Clarence P. Davis
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  3. Jacques Felblinger
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  4. Graeme C. McKinnon
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Debatin, J.F., Davis, C.P., Felblinger, J. et al. Evaluation of ultrafast phase-contrast imaging in the thoracic aorta. MAGMA 3, 59–66 (1995). https://doi.org/10.1007/BF01709848

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