Medical physics

What you'll learn

1. 1

   Medical physics uses physics to help doctors see inside your body without cutting you open — like X-rays, ultrasound, and MRI scans.

2. 2

   What does medical physics help doctors do?

3. 3

   Here's how an X-ray works: X-rays pass through your body, but bones block them — so bones show up white on the film.

4. 4

   Let's trace an X-ray beam step by step.

5. 5

   Drag the X-ray source to aim at the hand — see how the bones block the beam?

6. 6

   Why do bones show up white on an X-ray?

7. 7

   Which of these uses sound waves instead of X-rays?