Which term describes the amount of photons absorbed by the detector?

Which term describes the amount of photons absorbed by the detector?

• A. Capture efficiency
• B. Quantization
• C. Spatial resolution
• D. Quantum mottle

Answer: (A)

Detector efficiency describes how many of the incoming x-ray photons are actually absorbed by the detector and contribute to the signal. This captured fraction is called capture efficiency. The higher the capture efficiency, the more photons are converted into signal, improving image exposure and reducing noise for a given dose. Quantization is about converting the analog signal into digital values, not about how many photons are absorbed. Spatial resolution relates to the ability to distinguish small details, not to photon absorption. Quantum mottle describes the grainy appearance that comes from photon noise, which depends on the number of detected photons but does not define how many photons are absorbed by the detector.

Detector efficiency describes how many of the incoming x-ray photons are actually absorbed by the detector and contribute to the signal. This captured fraction is called capture efficiency. The higher the capture efficiency, the more photons are converted into signal, improving image exposure and reducing noise for a given dose.

Quantization is about converting the analog signal into digital values, not about how many photons are absorbed. Spatial resolution relates to the ability to distinguish small details, not to photon absorption. Quantum mottle describes the grainy appearance that comes from photon noise, which depends on the number of detected photons but does not define how many photons are absorbed by the detector.