1. Medical Technologies 1. Describe different technologies used to observe the body.

2. Who uses these technologies?  A Radiologist  Carries out radiological procedures to view the inside of the body.

3. X-Rays  High energy radiation can penetrate tissues and strike a photographic plate.  Radiodensity: resistance to x-ray penetration

4. Radiodensity Air → Fat → Liver → Blood → Muscle→ Bone Low Radiodensity → High Radiodensity Low Radiodensity → High Radiodensity Gray/Black Color → White Color on X-Ray Barium Contrast X-ray of digestive tract. Barium is very radiodense

5. CT or CAT Scan  Computed Tomography  Uses X-rays that rotate around the body  Sectional views, easily shows soft tissues  Used to monitor growths and procedures

6. MRI  Magnetic Resonance Imaging  Surrounds the body with a magnetic field, then sends radio waves to sense pulses from soft tissues.  Useful for imaging tissues of brain, neck and spinal cord.  More detailed than CT  No metal or electronic devices near machine (no pacemakers!)

7. How powerful is the MRI magnet?  Photo from howstuffworks.com

8. www.koppdevelopment.com

9. Ultrasound  Sound waves are transmitted directly through skin and echoes are detected and mapped.  Will not harm fetus  Produces a picture called an echogram New 4D ultrasounds Old 3D ultrasound

10. EEG’s & MEG’s  Measures small electrical currents from neurons inside the brain.  Shows damage to brain tissue