Notes

[Direct Conversion X-ray Detectors]: Amorphous selenium is used as a semiconductor material in direct conversion X-ray detectors. These detectors directly convert X-ray photons into electrical signals. When X-rays strike the a-Se layer, they generate electron-hole pairs, creating an electric charge.

[High Sensitivity and Resolution]: Amorphous selenium has a high atomic number and density, making it an effective X-ray absorber. This property enables high sensitivity in detecting X-ray photons, even at low doses, which is critical for reducing radiation exposure for patients and healthcare providers. Furthermore, its amorphous structure allows for high spatial resolution, capturing fine details in X-ray images accurately.

[Wide Dynamic Range]: Amorphous selenium detectors have a wide dynamic range, which means they can accurately detect both low and high X-ray photon intensities. This capability is critical for imaging various anatomical structures with different X-ray attenuation properties, ensuring that details are captured across a wide range of tissue densities.

[Reduced Image Distortion]: Compared to indirect conversion detectors, which may suffer from optical blur or distortions caused by additional conversion layers, direct conversion detectors based on amorphous selenium provide better image quality with less distortion. This improves diagnostic accuracy by creating clearer and more accurate representations of anatomical structures.

Overall, the use of amorphous selenium in X-ray imaging systems contributes to improved image quality, radiation dose efficiency, and diagnostic accuracy, enhancing patient care and safety in medical diagnostics and interventions.