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Question 1

What is the primary controlling factor for image receptor (IR) exposure?

Answer 1

mAs

mAs stands for milliampere-seconds, which is a measure of the total amount of radiation produced.

Question 2

How does increasing mAs affect IR exposure?

Answer 2

More mAs = more IR exposure

This relationship is direct; doubling mAs doubles the exposure.

Question 3

What visibility factor allows structural details to be seen in a radiograph?

Answer 3

Contrast

Contrast is essential for distinguishing between different structures in the image.

Question 4

What is the effect of underexposure on an image?

Answer 4

Results in quantum mottle

Quantum mottle refers to a grainy appearance due to insufficient exposure.

Question 5

What happens to IR exposure when kVp is increased by 15%?

Answer 5

Doubles exposure

This is a significant aspect of radiographic technique adjustments.

Question 6

What is the relationship between SID and IR exposure?

Answer 6

As SID increases, IR exposure decreases

This relationship is explained by the Inverse Square Law.

Question 7

What is the Direct Square Law used for?

Answer 7

Calculating new mAs when SID changes

It helps maintain IR exposure when changing the distance.

Question 8

What is the main purpose of filtration in radiography?

Answer 8

Reduce patient skin dose

Filtration eliminates low-energy photons that do not enhance image quality.

Question 9

How does total filtration affect IR exposure?

Answer 9

As total filtration increases, IR exposure decreases

Increased filtration removes more low-energy photons.

Question 10

What happens to IR exposure as collimation increases?

Answer 10

IR exposure decreases

Increased collimation reduces field size and scatter, impacting exposure.

Question 11

How does tissue thickness affect IR exposure?

Answer 11

As tissue thickness increases, IR exposure decreases

Thicker tissues attenuate the beam more, requiring technique adjustments.

Question 12

What is the effect of using a grid on IR exposure?

Answer 12

As grid ratio increases, IR exposure decreases

Higher grid ratios require more technique adjustments to maintain exposure.

Question 13

What is the anode heel effect?

Answer 13

Intensity of beam is greater on the cathode side of the tube

This effect is useful for imaging uneven thickness body parts.

Question 14

Does focal spot size affect IR exposure?

Answer 14

No impact on IR exposure

Focal spot size affects recorded detail but not exposure levels.

Question 15

List the contributing factors that impact IR exposure

Answer 15

• kVp
• Distance
• Filtration
• Beam restriction
• Anatomy type/thickness
• Grid use
• Contrast material

Each of these factors can significantly influence the exposure received by the IR.

Question 16

What is the consequence of gross overexposure?

Answer 16

Causes loss of contrast

While the image may appear good, it violates the ALARA principle.

Question 17

True or False: Increasing kVp decreases the amount of radiation created.

Answer 17

False

Increasing kVp actually increases the amount of radiation produced.