RAD 110 Chapter 10 Key terms

4 Written Questions

1. The reduction in x-ray beam intensity as a result of photoelectric absorption and compton scattering
2. an x-ray absorption interaction in which the x-ray is not scattered but totally absorbed. A photoelectron is then released from the atom.
3. A high-atomic number material (for example, iodine and barium), or a low density, low-atomic number material (air) administered in liquid or gas form to improve the contrast resolution of an x-ray examination
4. threshold energy required by a photon to undergo pair production

3 Multiple Choice Questions

1. relationship among transmitted x-rays, photoelectrically absorbed x-rays, and compton scattered x-rays resulting in the x-ray image
   1. contrast agent
   2. secondary electron
   3. attenuation
   4. differential absorption
2. Having a single energy. Characteristic x-rays are monoenergetic, and the effective x-ray energy of an x-ray beam is the monoenergetic equivalent of the actual beam.
   1. monoenergetic
   2. attenuation
   3. mass density
   4. compton effect
3. quantity of matter per unit volume, usually specified in kilograms per cubic meter (kg/m3). Sometimes reported in grams per cubic centimeter (gm/cm3).
   1. mass density
   2. 1.02 MeV
   3. monoenergetic
   4. attenuation

3 True/False Questions

1. classical scattering → quantity of matter per unit volume, usually specified in kilograms per cubic meter (kg/m3). Sometimes reported in grams per cubic centimeter (gm/cm3).

   True        False

2. compton effect → A high-atomic number material (for example, iodine and barium), or a low density, low-atomic number material (air) administered in liquid or gas form to improve the contrast resolution of an x-ray examination

   True        False

3. secondary electron → A high-atomic number material (for example, iodine and barium), or a low density, low-atomic number material (air) administered in liquid or gas form to improve the contrast resolution of an x-ray examination

   True        False