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Using ca rdiac p hase t o o rder r econstruction (CAPTOR): A method to improve diastolic images
Author(s) -
Feinstein Jeffrey A.,
Epstein Frederick H.,
Arai Andrew E.,
Foo Thomas K. F.,
Hartley Michael R.,
Balaban Robert S.,
Wolff Steven D.
Publication year - 1997
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.1880070505
Subject(s) - cardiac cycle , heartbeat , ventricle , stroke volume , beat (acoustics) , diastole , ejection fraction , qrs complex , cardiology , medicine , biomedical engineering , computer science , physics , heart failure , acoustics , blood pressure , computer security
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.