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(radiology) The quality of showing poor enhancement; dimness or darkness in an image. quotations
One would expect the area of hypoenhancement on first-pass imaging to be larger than that of hyperenhancement on delayed contrast-enhanced imaging.
2007, Applied Radiology, page 14
Contrast-enhanced CT scans are commonly performed for the evaluation of symptoms suggestive of acute pulmonary embolism or aortic dissection but can incidentally detect areas of myocardial hypoenhancement that could trigger consideration of an acute MI.
2010, Christopher M. Kramer, Multimodality Imaging in Cardiovascular Medicine, page 53
Preoperatively, 611 segments (21%) had abnormal regional function, whereas 421 segments (14%) showed evidence of hypoenhancement.
2018, Warren J. Manning, Dudley J. Pennell, Cardiovascular Magnetic Resonance