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

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

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Ge, Lan Kino, Aya Lee, Daniel Dharmakumar, Rohan Carr, James C. Li, Debiao
Description	Country affiliation: United States Author Affiliation: Ge L ( Department of Radiology, Northwestern University, Chicago, IL, USA.)
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 motion-related image artifacts. A combination of sliding window and 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 (15-25 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-CG-HYPR (12.68 ± 2.46) is significantly higher (P < 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 mm, which is better than the turbo-FLASH (1.8 × 1.8 × 8.0 mm) and EPI (2.0 × 1.8 × 8.0 mm). 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.
File Format	HTM / HTML
ISSN	03638715
e-ISSN	15323145
DOI	10.1097/RCT.0b013e3181e9e9dd
Journal	Journal of Computer Assisted Tomography
Issue Number	5
Volume Number	34
Language	English
Publisher	Lippincott Williams & Wilkins
Publisher Date	2010-09-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Discipline Radiology Coronary Stenosis Diagnosis Image Enhancement Magnetic Resonance Angiography Animals Contrast Media Disease Models, Animal Feasibility Studies Gadolinium Dtpa Image Processing, Computer-assisted Research Support, N.i.h., Extramural Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Radiology, Nuclear Medicine and Imaging

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