Using cardiac phase to order reconstruction (CAPTOR): A method to improve diastolic images

Jeffrey A. Feinstein, Frederick H. Epstein, Andrew E. Arai, Thomas K F Foo, Michael R. Hartley, Robert S. Balaban, Steven D. Wolff

Research output: Contribution to journalArticlepeer-review

53 Scopus citations


A method is proposed to reconstruct multiphase images that accurately depicts the entire cardiac cycle. A segmented, gradient-recalled-echo sequence (FASTCARD) was modified to acquire data continuously. Images were reconstructed retrospectively by selecting views from each heartbeat based on cardiac phase rather than the time elapsed from the QRS complex. Cardiac phase was calculated using a model that compensates for beat-to-beat heart rate changes. Images collected using cardiac phase to order reconstruction (CAPTOR) depict the entire cardiac cycle and lack the temporal gap that is characteristic of prospectively reconstructed sequences. Time-volume curves of the left ventricle capture the contribution of atrial contraction to end- diastolic volume (EDV). Transmitral phase-contrast flow measurements show a second peak inflow (a wave) that is absent in the standard sequence. Because atrial contraction contributes to ventricular EDV, images using CAPTOR potentially may provide a more reliable measure of EDV, stroke volume, and ejection fraction than standard techniques.

Original languageEnglish (US)
Pages (from-to)794-798
Number of pages5
JournalJournal of Magnetic Resonance Imaging
Issue number5
StatePublished - Sep 1997
Externally publishedYes


  • Flow quantification
  • Heart
  • Image reconstruction
  • Magnetic resonance imaging
  • Phase contrast
  • Volume measurement

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology


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