1129 Review

What is peak kilovoltage?

• The total amount of radiation produced

• the highest energy level of photons in the x-ray beam, equal to the highest

  voltage established across the x-ray tube

• The lowest voltage applied to the x-ray tube

• The duration of the x-ray exposure

What is milliampere-seconds (mAs)?

• the product of electron tube current and the amount of time in seconds that the x-

  ray tube is activated

• A measure of x-ray beam quality

• A measure of radiation intensity

• A measure of patient radiation dose

What controls the quality or penetrating power of the photons in the x-ray beam and in

some way affects the quitity or number of photons in the beam?

• mAs

• Exposure time

• Distance from the source

• Peak kilovoltage

What is the main determinant of how much radiation is directed toward a patient during a selected x-ray exposure?

• Tube current

• Beam filtration

• milliamperes

• kVp

The radiographer is responsible for the radiation dose the patient receives during an imaging procedure.

• True

• False

Why is it important for radiographers to have a suitable understanding of kVp and mAs?

• to select appropriate techniques so they can minimize that dose to the patient

  while producing optimal-quality images.

• To reduce equipment costs

• To enhance technician skills

• To ensure patient comfort

When an x-ray enters a material such as biological tissues what are some things that can happen?

• 1. Interact with the atoms of the biologic material in the patient and be absorbed

  2. Interact with the atoms in the biologic material and be scattered, causing some

  indirect

  transmission

  3. Pass through without interaction

• Reflection and absorption

• Emission and absorption

• Transmission and reflection

What is absorption according to this chapter?

• The process of x-rays passing through a material

• • The process of x-rays being produced

• • The process of x-rays bouncing off a surface

• When electromagnetic energy is transferred from the x-rays to the atoms of the

  patient’s biologic tissue.

The amount of energy absorbed per unit mass is referred to?

• Dose rate

• Absorbed Dose

• Exposure

• Radiation dose

Is it better for the radiographer when the patient’s dose is minimal?

• No, because we need contrast

• No, because more radiation is better for better imaging

• Yes, because less radiation is scattered from the patient.

• Yes, because the radiographer needs to have a good image