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MRI of the chest gives detailed pictures of structures within the chest cavity, including the mediastinum, chest wall, pleura, heart and vessels, from almost any angle. MRI also provides movie-like sequential imaging of the cardiovascular system that is important to assess the health and function of these structures (heart, valves, great vessels, etc.).
MRI generally is not recommended for patients who have been acutely injured; however, this is a clinical judgment. This is because traction devices and many types of life support equipment must be kept away from the area to be imaged. Furthermore, the examination takes longer than other imaging modalities (typically x-ray and CT) and the results may not be immediately available as is often necessary in trauma situations.
Source: RadiologyInfo.org > Link