影像 (yǐngxiàng) refers to a visual image or footage, often from medical scans, satellites, or film — it emphasizes the recorded or captured visual data. It is more technical and specific than 图像 (túxiàng 'picture, graphic'), which is a general term for any visual representation. 形象 (xíngxiàng) is about appearance or public image, not a physical picture.