Myocardial perfusion magnetic resonance imaging using sliding-window conjugate-gradient HYPR methods in canine with stenotic coronary arteries

Lan Ge, Aya Kino, Daniel Lee, Rohan Dharmakumar, James C. Carr, Debiao Li*

*Corresponding author for this work

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Purpose: First-pass perfusion magnetic resonance imaging (MRI) is a promising technique for detecting ischemic heart disease. However, the diagnostic value of the method is limited by the low spatial coverage, resolution, signal-to-noise ratio (SNR), and cardiac motionYrelated image artifacts. A combination of sliding windowand conjugate-gradient HighlY constrained back-PRojection reconstruction (SW-CG-HYPR) method has been proposed in healthy volunteer studies to reduce the acquisition window for each slice while maintaining the temporal resolution of 1 frame per heartbeat in myocardial perfusion MRI. This method allows for improved spatial coverage, resolution, and SNR. Methods: In this study, we use a controlled animal model to test whether the myocardial territory supplied by a stenotic coronary artery can be detected accurately by SW-CG-HYPR perfusion method under pharmacological stress. Results: Results from 6 mongrel dogs (15Y25 kg) studies demonstrate the feasibility of SW-CG-HYPR to detect regional perfusion defects. Using this method, the acquisition time per cardiac cycle was reduced by a factor of 4, and the spatial coverage was increased from 2 to 3 slices to 6 slices as compared with the conventional techniques including both turbo-Fast Low Angle Short (FLASH) and echoplanar imaging (EPI). The SNR of the healthy myocardium at peak enhancement with SW-CGHYPR (12.68 ± 2.46) is significantly higher (P G 0.01) than the turbo- FLASH (8.65 ± 1.93) and EPI (5.48 ± 1.24). The spatial resolution of SW-CG-HYPR images is 1.2 × 1.2 × 8.0 mm3, which is better than the turbo-FLASH (1.8×1.8 ×8.0 mm3) and EPI (2.0× 1.8× 8.0mm3). Conclusions: Sliding-window CG-HYPR is a promising technique for myocardial perfusion MRI. This technique provides higher image quality with respect to significantly improved SNR and spatial resolution of the myocardial perfusion images, which might improve myocardial perfusion imaging in a clinical setting.

Original languageEnglish (US)
Pages (from-to)684-688
Number of pages5
JournalJournal of Computer Assisted Tomography
Volume34
Issue number5
DOIs
StatePublished - Sep 2010

Keywords

  • Animal studies
  • Coronary artery disease
  • Magnetic resonance imaging
  • Myocardial perfusion

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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