AEC, Detector, and Display QC

How is AEC performance commonly tested?

Make exposures through different thicknesses of aluminum and determine whether receptor exposure remains consistent.

During AEC testing, why are different thicknesses of aluminum used?

Different thicknesses create different amounts of attenuation so the AEC must compensate.

During an AEC test, aluminum thickness is increased. What should happen to exposure time?

Exposure time should increase because more radiation is attenuated before reaching the AEC detector.

During an AEC test, aluminum thickness is decreased. What should happen to exposure time?

Exposure time should decrease because sufficient radiation reaches the AEC detector sooner.

What should remain approximately constant when AEC operates properly through different aluminum thicknesses?

Receptor exposure.

In conventional radiographic AEC operation, which exposure factor is terminated or controlled by the AEC?

Exposure time.

An AEC exposure produces the desired receptor exposure at 60 kVp. If kVp is increased by 15% while AEC is used, what should happen to receptor exposure?

It should remain approximately the same because the AEC shortens the exposure time.

What is the difference between AEC and ABC/AERC?

AEC terminates a radiographic exposure; ABC/AERC continuously adjusts fluoroscopic exposure factors to maintain image brightness.

Which detector QC test determines whether the entire image receptor responds evenly to a uniform exposure?

Detector or receptor uniformity testing.

What should a properly functioning detector demonstrate during uniformity testing?

Approximately uniform response throughout the image receptor without unexplained variations.

Which CR QC test verifies that residual image information has been completely removed from a PSP plate?

Erasure thoroughness testing.

What may occur if a CR imaging plate is not completely erased?

Residual image information or ghosting may appear on a subsequent image.

What type of test object may be used to evaluate spatial resolution of an imaging receptor?

A line-pair or lines-per-millimeter test pattern.

What is being evaluated when a QC test determines how many line pairs per millimeter can be distinguished?

Spatial resolution.

Which display-monitor QC pattern is commonly used to assess grayscale and monitor performance?

SMPTE test pattern.

What display characteristic is checked when determining whether different shades of gray can be distinguished properly?

Grayscale display performance.

What monitor characteristic describes the amount of light emitted from the display?

Luminance.

What does GSDF help standardize?

Consistent grayscale appearance and luminance response across diagnostic displays.

Why is display-monitor QC important even when the detector produced an adequate image?

Poor monitor brightness, grayscale response, or resolution can hide diagnostic information even when the acquired image data are adequate.