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Updated: Aug 13, 2026
Retrospective Cardiac Gating with A Prototype Small-Animal X-ray Computed Tomograph
Published on: February 21, 2025
Retrospective gating for mouse cardiac MRI
Jonathan Bishop1, Akiva Feintuch, Nicholas A Bock
1Mouse Imaging Centre, Hospital for Sick Children, Toronto, Ontario, Canada.
Abstract:
Cardiac MR imaging in small animals presents some difficulties due to shorter cardiac cycles and smaller dimensions than in human beings, but prospectively gated techniques have been successfully applied. As with human imaging, there may be certain applications in animal imaging for which retrospective gating is preferable to prospective gating. For example, cardiac imaging in multiple mice simultaneously is one such application. In this work we investigate the use of retrospective gating for cardiac imaging in a mouse. Using a three-dimensional imaging protocol, we show that image quality with retrospective gating is comparable to prospectively gated imaging. We conclude that retrospective gating is applicable for small animal cardiac MRI and show how it can be applied to the problem of cardiac MRI in multiple mice.
Insights
Retrospective gating is a viable technique for small animal cardiac MRI, offering image quality comparable to prospective gating. This method enables simultaneous cardiac imaging in multiple mice, overcoming previous limitations.
Area of Science:
- Cardiovascular Imaging
- Magnetic Resonance Imaging
- Small Animal Models
Background:
- Cardiac MRI in small animals faces challenges due to short cardiac cycles and small dimensions.
- Prospectively gated techniques are established but may not suit all applications.
- Retrospective gating offers potential advantages for specific small animal imaging scenarios.
Purpose of the Study:
- To investigate the feasibility and efficacy of retrospective gating for cardiac MRI in mice.
- To compare image quality between retrospective and prospectively gated cardiac MRI in small animals.
- To demonstrate the application of retrospective gating for simultaneous multi-mouse cardiac imaging.
Main Methods:
- A three-dimensional imaging protocol was employed for cardiac MRI in a mouse model.
- Retrospective gating data was acquired and analyzed.
- Image quality was assessed and compared against prospectively gated data.
Main Results:
- Cardiac MRI using retrospective gating achieved image quality comparable to prospectively gated imaging.
- The study successfully demonstrated the applicability of retrospective gating in a small animal model.
- Retrospective gating facilitated simultaneous cardiac MRI acquisition in multiple mice.
Conclusions:
- Retrospective gating is a suitable and effective method for small animal cardiac MRI.
- This technique enhances the capability for simultaneous multi-mouse cardiac imaging.
- Retrospective gating provides a valuable alternative for specific applications in small animal cardiovascular research.
