Out of the following combinations, which two will result in an x-ray system that has a high Detective Quantum Efficiency (DQE)?

A high Detective Quantum Efficiency (DQE) in an x-ray system indicates the system's effectiveness in converting x-ray signals into a useful image. One of the key factors that contribute to high DQE is the ability to work efficiently at lower x-ray exposure levels while still producing quality images. This means that if a system requires a lower x-ray signal to produce a quality image, it demonstrates high efficiency in utilizing the detected x-rays, which is a primary indicator of DQE.

While other factors like high conversion efficiency play a role, choosing a system that operates with reduced exposure while maintaining image quality is essential for achieving high DQE. This not only improves the quality of diagnostics but also enhances patient safety by minimizing radiation exposure. Therefore, the combination of requiring a lower x-ray signal to produce a quality image directly aligns with the principles that define a system with high DQE.