Final answer:
Following the injection of contrast media, the contrast between a lesion and surrounding tissue generally improves, which assists in better visualization and diagnosis.
Step-by-step explanation:
The contrast between a lesion and the surrounding tissue may improve following the injection of contrast media. Contrast media are substances used to enhance the visibility of internal structures in imaging techniques such as X-rays, CT scans, and MRI. They work by altering the way imaging beams interact with different types of tissues, increasing the difference in density or signal between a lesion and normal tissue, thereby making the abnormal area more visible and defined. This enhanced contrast can help in accurate diagnosis and assessment of the lesion.