PHTY211 Lecture Notes - Lecture 8: Coxa Valga, Metaphysis, Radiculopathy
Document Summary
4. 1 outline the basic principles of diagnostic imaging techniques: physics. Xrays & ct: photons being produced and absorbed produces contrast. Scatter every time a photon hits something, it gets absorbed in that direction or it can scatter. X-rays contain high-energy photons which are transmitted through a patient at a specific angle (the view), toward a cassette containing photographic film. Mri: works on the fact that protons are weakly magnetic. when protons at rest are exposed to a strong magnet, they align in one direction and then produce a magnetic field. X-rays, gamma rays and some other high energy particles are called ionising radiation" because they can deposit enough energy into a body tissue to change its molecules or proteins by ejecting an electron from an atom. A type of ionising radiation produced by an x-ray tube. Radiation exposure occurs while the machine is on and activated by operator. Uses strong magnetic fields and radio waves to make images.
