Chest X-ray (CXR) is the first-line, followed by CT Pulmonary Angiogram (CTPA) for PE. Head Injury: Non-contrast CT brain.

Digital PDFs allow you to zoom in on high-resolution images to spot subtle fractures or faint opacities.

Hyperechoic structures look bright (gallstones, bone surfaces); anechoic structures look completely black (fluid-filled cysts, blood vessels).