Final answer:
In medical imaging, the unsharp edges of a body part are referred to as the border. A clear, well-defined border is crucial for accurate diagnosis, and blurring can indicate pathology or image quality issues.
Step-by-step explanation:
The unsharp edges of a body part are referred to as the border. This term is used in various fields, including medical imaging, where clarity of the body part's edges is crucial for accurate diagnosis. A clear border indicates a well-defined separation between structures, whereas an unsharp or unclear border can be a sign of pathology or an indication of the quality of the image. In the context of medical imaging, the sharpness of an image is very important, and a loss of border sharpness may be referred to as blurring.