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Self‐gated MRI of multiple beat morphologies in the presence of arrhythmias
Author(s) -
Contijoch Francisco,
Iyer Srikant Kamesh,
Pilla James J.,
Yushkevich Paul,
Gorman Joseph H.,
Gorman Robert C.,
Litt Harold,
Han Yuchi,
Witschey Walter R.T.
Publication year - 2017
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.26381
Subject(s) - bigeminy , beat (acoustics) , medicine , heartbeat , cardiology , hemodynamics , sinus rhythm , nuclear medicine , atrial fibrillation , computer science , physics , computer security , acoustics , ventricular tachycardia
Purpose Develop self‐gated MRI for distinct heartbeat morphologies in subjects with arrhythmias. Methods Golden angle radial data was obtained in seven sinus and eight arrhythmias subjects. An image‐based cardiac navigator was derived from single‐shot images, distinct beat types were identified, and images were reconstructed for repeated morphologies. Image sharpness, contrast, and volume variation were quantified and compared with self‐gated MRI. Images were scored for image quality and artifacts. Hemodynamic parameters were computed for each distinct beat morphology in bigeminy and trigeminy subjects and for sinus beats in patients with infrequent premature ventricular contractions. Results Images of distinct beat types were reconstructed except for two patients with infrequent premature ventricular contractions. Image contrast and sharpness were similar to sinus self‐gated images (contrast = 0.45 ± 0.13 and 0.43 ± 0.15; sharpness = 0.21 ± 0.11 and 0.20 ± 0.05). Visual scoring was highest in self‐gated images (4.1 ± 0.3) compared with real‐time (3.9 ± 0.4) and ECG‐gated cine (3.4 ± 1.5). ECG‐gated cine had less artifacts than self‐gating (2.3 ± 0.7 and 2.1 ± 0.2), but was affected by misgating in two subjects. Among arrhythmia subjects, post‐extrasystole/sinus (58.1 ± 8.6 mL) and interrupted sinus (61.4 ± 5.9 mL) stroke volume was higher than extrasystole (32.0 ± 16.5 mL; P < 0.02). Conclusion Self‐gated imaging can reconstruct images during ectopy and allowed for quantification of hemodynamic function of different beat morphologies. Magn Reson Med 78:678–688, 2017. © 2016 International Society for Magnetic Resonance in Medicine