Direct DR detectors convert x-rays directly into visible light without the scattering of light occurring.
The spatial resolution of DR detector represents the resolution ability of tissue fine structure, and the main factor of image spatial resolution is scattered light.
Therefore, the spatial resolution of X-ray detector depends on the size of thin film transistor matrix per unit area. The larger the matrix, the more transistors, the higher the spatial resolution.
The modulation transfer function is closely related to the spatial resolution, which is characterized by the transmitter transfer function, while the modulation transfer function usually represents the resolution of the detector to the detail of the image.
The spatial resolution represents the contrast of the fine structure of the image and usually improves the modulation transfer function through the filter.