Contrast techniques are methods used in various fields, such as photography, art, and design, to highlight differences between elements. By using contrasting colors, shapes, or textures, these techniques draw attention to specific features, making them stand out. For example, in photography, a bright subject against a dark background creates a striking visual effect. In medical imaging, contrast techniques enhance the visibility of structures within the body. Contrast agents are substances introduced into the body to improve the clarity of images obtained through methods like MRI or CT scans. This allows healthcare professionals to better diagnose and monitor conditions by providing clearer views of organs and tissues.