CLO 2 Medical Image quality and ALARA principles

What is the definition of half value layer?

• The half value layer is the thickness of a material required to reduce the intensity of a specified type of radiation to one-tenth of its original value.

• The half value layer is the thickness of a material required to reduce the intensity of a specified type of radiation to half of its original value.

• The half value layer is the thickness of a material required to reduce the intensity of a specified type of radiation to one-third of its original value.

• The half value layer is the thickness of a material required to reduce the intensity of a specified type of radiation to one-fourth of its original value.

What does ALARA principle stand for?

• As Low As Reasonably Achievable

• As Low As Relatively Achievable

• As Low As Remarkably Achievable

• As Low As Ridiculously Achievable

What is added filtration in radiography?

• Use of additional materials to amplify low-energy x-rays and increase patient exposure to radiation.

• Use of additional materials to absorb high-energy x-rays and reduce patient exposure to radiation.

• Use of additional materials to block high-energy x-rays and increase patient exposure to radiation.

• Use of additional materials to absorb low-energy x-rays and reduce patient exposure to radiation.

What is the 15% rule in radiography?

• ↑ kVp by 15% has the same effect on the image as mAs × 2.

• A radiographic technique should be adjusted by 20% if the patient's body habitus differs significantly from the average.

• ↑ kVp by 15% has the same effect on the image as mAs ÷ 2.

• The 15% rule in radiography refers to the maximum allowable exposure time for a single radiograph.

Identify 2 ways to change the intensity of the x-ray beam that arrives to the image receptor:

• collimation

• kVp and mAs

• grids

• beam filtering

Why is half value layer important in radiation protection?

• The half value layer is not important in radiation protection as it does not affect the intensity of radiation.

• The half value layer is important in radiation protection because it measures the thickness of a material required to reduce the intensity of radiation by a quarter.

• The half value layer is important in radiation protection because it measures the thickness of a material required to increase the intensity of radiation by half.

• The half value layer is important in radiation protection because it measures the thickness of a material required to reduce the intensity of radiation by half.

How does the ALARA principle help in reducing radiation exposure?

• By maximizing time, decreasing distance, and using shielding measures.

• By minimizing time, increasing distance, and using shielding measures.

• By minimizing time, decreasing distance, and avoiding shielding measures.

• By maximizing time, decreasing distance, and avoiding shielding measures.

What are the factors that affect the half value layer?

• Type of radiation, wavelength of radiation, and temperature of material.

• Type of material, energy of radiation, and density of material.

• Thickness of material, type of radiation, and temperature of material.

• Thickness of material, energy of radiation, and temperature of material.

Explain the concept of added filtration and its role in radiation safety.

• Added filtration is the process of removing material, such as aluminum or copper, from the path of the X-ray beam to increase low-energy photons. This increases patient dose and reduces image quality.

• Added filtration is the process of inserting additional material, such as lead or steel, into the path of the X-ray beam to remove high-energy photons. This increases patient dose and degrades image quality.

• Added filtration is the process of inserting additional material, such as aluminum or copper, into the path of the X-ray beam to remove low-energy photons. This reduces patient dose and improves image quality. Its role in radiation safety is to minimize unnecessary radiation exposure.

• Added filtration is the process of adjusting the X-ray machine settings to increase the intensity of the X-ray beam. This improves patient dose and image quality.

Identify which factor affects only the quantity of the x-ray beam:

• mAs

• kVp

• mA

• SID