DQE is directly related to which factor?

DQE is directly related to which factor?

• A. Capture efficiency
• B. Spatial frequency
• C. Image noise
• D. Display resolution

Answer: (A)

Detective Quantum Efficiency measures how effectively an imaging system converts incoming x-ray photons into a useful image, accounting for the noise in the process. The factor that most directly drives this efficiency is capture efficiency—the fraction of incident x-rays that the detector actually absorbs and converts into a signal. When capture efficiency is higher, more photons contribute to the image, boosting the signal relative to noise and increasing DQE. If photons aren’t captured, improving processing or resolution won’t compensate, and DQE drops regardless of other factors. Spatial frequency describes how performance changes with image detail and is something DQE is often analyzed across, but it is not the direct determinant of how well the detector uses incoming photons. Display resolution pertains to how the image is shown, not to how photons are captured and converted. Image noise affects DQE as part of the overall calculation, but the primary driver is how many photons the detector actually captures.

Detective Quantum Efficiency measures how effectively an imaging system converts incoming x-ray photons into a useful image, accounting for the noise in the process. The factor that most directly drives this efficiency is capture efficiency—the fraction of incident x-rays that the detector actually absorbs and converts into a signal. When capture efficiency is higher, more photons contribute to the image, boosting the signal relative to noise and increasing DQE. If photons aren’t captured, improving processing or resolution won’t compensate, and DQE drops regardless of other factors. Spatial frequency describes how performance changes with image detail and is something DQE is often analyzed across, but it is not the direct determinant of how well the detector uses incoming photons. Display resolution pertains to how the image is shown, not to how photons are captured and converted. Image noise affects DQE as part of the overall calculation, but the primary driver is how many photons the detector actually captures.