x-rays & ultrasound

x-rays & ultrasound

1. x-rays

   • hospitals for medical diagnosis
     • high frequency with a short wavelength
     • they pass through healthy tissues but are absorbed by denser materials like bones and metals
     • they are used to diagnose medical conditions such as bone fractures or breaks and also dental problems
     • the images are formed electronically using charge-coupled devices (CCDs) CCDs are silicon chips that are divided into millions of identical pixels. they detect the x-rays and produce electronic signals which form the images