CT Windowing: Hounsfield Units & Tissue Contrast

Every CT scan stores far more density information than a screen can show at once. This simulator builds a synthetic chest-CT phantom out of thousands of voxels, each assigned a realistic Hounsfield Unit value — bone, lung, fat, soft tissue, mediastinum and a small dense nodule — and lets you sweep the same window center and window width controls a radiologist uses on a real PACS viewer. Watch the rib cage vanish under a lung window, the airways vanish under a bone window, and the buried nodule appear or disappear entirely depending on which 400-unit slice of the -1000 to +1000 HU range you choose to look at.