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In cardiac MRI, which of the following are true?
a) The normal pericardium returns low signal on T1-weighted imaging
b) Prosthetic heart valves are an absolute contraindication to MRI scanning
c) The superior pericardial recess is rarely seen on MRI
d) In constrictive pericarditis, the pericardium is typically thickened
e) MRI may distinguish constrictive pericarditis from restrictive cardiomyopathy

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