Radiographic Equipment and Maintenance Flashcards

Which type of x-ray generator produces the most consistent radiation output with the least ripple in the kVp waveform?

Answer: High-frequency generator

High-frequency generators operate at frequencies of 6,000–100,000 Hz, producing near-constant potential with minimal ripple (<1%), resulting in a more efficient and consistent x-ray output.

The source-to-image distance (SID) must be verified as part of equipment quality control. The typical standard SID for chest radiography is:

Answer: 72 inches (183 cm)

The standard SID for chest radiography is 72 inches (183 cm) to minimize magnification of the cardiac silhouette and improve image sharpness.

An x-ray tube that shows a gradual decrease in mA at the selected filament heating station over time most likely indicates:

Answer: Tungsten vaporization causing filament thinning

Over time, tungsten vaporizes from the filament, causing it to thin and eventually reducing the number of thermionic electrons emitted, which decreases the tube current (mA).

Which collimator component is responsible for defining the size and shape of the primary x-ray beam?

Answer: Lead shutters (leaves)

The lead shutters (leaves) in the collimator are the primary beam-restricting components that are adjusted to define the size and shape of the x-ray beam.

During acceptance testing of a new x-ray unit, which measurement verifies that the radiation output (mR/mAs) is consistent across different mAs combinations?

Answer: Exposure linearity test

Exposure linearity testing verifies that radiation output (mR/mAs) remains consistent when the same total mAs is achieved through different combinations of mA and time.

A grid's Bucky factor represents:

Answer: The increase in exposure needed when using a grid compared to non-grid technique

The Bucky factor (grid factor) indicates how many times more exposure (mAs) is required when using a grid compared to a non-grid technique to produce the same image density.