Premium
All‐systolic first‐pass myocardial rest perfusion at a long saturation time using simultaneous multi‐slice imaging and compressed sensing acceleration
Author(s) -
Ferrazzi Giulio,
McElroy Sarah,
Neji Radhouene,
Kunze Karl P.,
Nazir Muhummad Sohaib,
Speier Peter,
Stäb Daniel,
Forman Christoph,
Razavi Reza,
Chiribiri Amedeo,
Roujol Sébastien
Publication year - 2021
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.28712
Subject(s) - perfusion , diastole , bolus (digestion) , perfusion scanning , nuclear medicine , myocardial perfusion imaging , biomedical engineering , medicine , cardiology , blood pressure
Purpose To enable all‐systolic first‐pass rest myocardial perfusion with long saturation times. To investigate the change in perfusion contrast and dark rim artefacts through simulations and surrogate measurements. Methods Simulations were employed to investigate optimal saturation time for myocardium‐perfusion defect contrast and blood‐to‐myocardium signal ratios. Two saturation recovery blocks with long/short saturation times (LTS/STS) were employed to image 3 slices at end‐systole and diastole. Simultaneous multi‐slice balanced steady state free precession imaging and compressed sensing acceleration were combined. The sequence was compared to a 3 slice‐by‐slice clinical protocol in 10 patients. Quantitative assessment of myocardium‐peak pre contrast and blood‐to‐myocardium signal ratios, as well as qualitative assessment of perceived SNR, image quality, blurring, and dark rim artefacts, were performed. Results Simulations showed that with a bolus of 0.075 mmol/kg, a LTS of 240‐470 ms led to a relative increase in myocardium‐perfusion defect contrast of 34% ± 9%‐28% ± 27% than a STS = 120 ms, while reducing blood‐to‐myocardium signal ratio by 18% ± 10%‐32% ± 14% at peak myocardium. With a bolus of 0.05 mmol/kg, LTS was 320‐570 ms with an increase in myocardium‐perfusion defect contrast of 63% ± 13%‐62% ± 29%. Across patients, LTS led to an average increase in myocardium‐peak pre contrast of 59% ( P < .001) at peak myocardium and a lower blood‐to‐myocardium signal ratio of 47% ( P < .001) and 15% ( P < .001) at peak blood/myocardium. LTS had improved motion robustness ( P = .002), image quality ( P < .001), and decreased dark rim artefacts ( P = .008) than the clinical protocol. Conclusion All‐systolic rest perfusion can be achieved by combining simultaneous multi‐slice and compressed sensing acceleration, enabling 3‐slice cardiac coverage with reduced motion and dark rim artefacts. Numerical simulations indicate that myocardium‐perfusion defect contrast increases at LTS.