MR "microscopy" of the rat thorax

Area of Science:

• Biomedical Imaging
• Cardiopulmonary Anatomy
• Small Animal Research

Background:

• Magnetic Resonance (MR) imaging offers noninvasive visualization capabilities.
• Cardiac gating and scan-synchronous ventilation are crucial for high-resolution imaging in dynamic physiological systems.
• Rodent models are vital for studying complex biological processes.

Purpose of the Study:

• To evaluate the efficacy of MR imaging combined with cardiac gating and ventilation for high-resolution intrathoracic anatomy in rats.
• To demonstrate the capability of MR "microscopy" for visualizing detailed cardiopulmonary structures.

Main Methods:

• Anesthetized rats were intubated and ventilated synchronously with MR image acquisition.
• Images were acquired using a 1.5 T MR system with a 3D spin warp sequence, gated to the cardiac cycle.
• High-resolution, contiguous 2.5 mm thick slices were obtained simultaneously.

Main Results:

• Detailed visualization of major vessels, cardiac chambers, valves, and papillary muscles was achieved.
• Major pulmonary vessels and peripheral lung parenchyma were clearly depicted.
• MR "microscopy" successfully imaged all major cardiopulmonary structures in relation to the cardiac cycle.

Conclusions:

• MR imaging with cardiac gating and ventilation enables noninvasive, high-resolution assessment of rat cardiopulmonary anatomy.
• This technique provides unprecedented detail for studying cardiopulmonary structures in rodent models.
• The findings open new research avenues in noninvasive cardiopulmonary investigation.