X-Ray Certification Equipment Operation and Maintenance 3

Question 1

Which type of X-ray generator provides the most consistent and efficient X-ray production?

Accepted Answer

High-frequency generator

Answer

High-frequency generators produce near-constant potential with less than 1% ripple, resulting in the most consistent and efficient X-ray production of all generator types.

Question 2

A collimator light field should match the X-ray field to within what tolerance according to quality control standards?

Accepted Answer

Within 5% of the SID in each direction

Answer

The light field/X-ray field congruence must be within 2% of the SID in each direction (not to exceed ±1% of SID per side) per ACR/NCRP guidelines.

Question 3

What is the function of the autotransformer in an X-ray circuit?

Accepted Answer

Allows selection of kVp by varying voltage supplied to the step-up transformer

Answer

The autotransformer acts as a voltage selector that supplies variable voltage to the primary of the step-up transformer, allowing the radiographer to select the desired kVp.

Question 4

During fluoroscopy, the image intensifier converts X-rays to a visible image through which sequence?

Accepted Answer

X-rays → light → electrons → light

Answer

The image intensifier converts X-rays to light (input phosphor), then to electrons (photocathode), then accelerates and focuses electrons, and finally converts back to light at the output phosphor.

Question 5

Which factor directly controls the quantity (number) of X-rays produced in an X-ray tube?

Accepted Answer

mAs

Answer

mAs (milliampere-seconds) directly controls the quantity of X-rays produced by determining the number of electrons flowing from cathode to anode per unit time multiplied by exposure time.

X-Ray Certification Practice Test

X-Ray Certification Practice Test

X-Ray Certification Equipment Operation and Maintenance 3