Related Experiment Video
Updated: Jun 8, 2026
Retrograde Perfusion and Filling of Mouse Coronary Vasculature as Preparation for Micro Computed Tomography Imaging
Published on: February 10, 2012
Myocardial perfusion magnetic resonance imaging using sliding-window conjugate-gradient HYPR methods in canine with
1Department of Radiology, Northwestern University, Chicago, IL, USA.
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.
Insights
The sliding window conjugate gradient HighlY constrained back-PRojection reconstruction (SW-CG-HYPR) method improves myocardial perfusion MRI by enhancing image quality. This technique offers better signal-to-noise ratio and spatial resolution for detecting ischemic heart disease.
Area of Science:
- Cardiovascular Imaging
- Medical Physics
Background:
- First-pass perfusion MRI is crucial for diagnosing ischemic heart disease.
- Limitations include low spatial coverage, resolution, SNR, and motion artifacts.
Purpose of the Study:
- To evaluate the SW-CG-HYPR method in an animal model.
- To assess its accuracy in detecting myocardial territories supplied by stenotic coronary arteries under pharmacological stress.
Main Methods:
- Utilized a controlled animal model (6 mongrel dogs).
- Applied the SW-CG-HYPR technique for myocardial perfusion MRI.
- Compared results with conventional turbo-FLASH and EPI techniques.
Main Results:
- SW-CG-HYPR successfully detected regional perfusion defects.
- Acquisition time per cycle reduced by 4x; spatial coverage increased from 2-3 to 6 slices.
- Significantly higher SNR (12.68 ± 2.46) and better spatial resolution (1.2x1.2x8.0 mm) compared to turbo-FLASH and EPI.
Conclusions:
- SW-CG-HYPR is a promising technique for myocardial perfusion MRI.
- Offers improved SNR and spatial resolution, potentially enhancing clinical diagnostic capabilities.
