What is the primary function of CsI in digital imaging systems?

The primary function of cesium iodide (CsI) in digital imaging systems is to convert x-rays to visible light. CsI is a scintillator, which is a specialty material that emits light when it is exposed to ionizing radiation, such as x-rays. In digital imaging systems, x-rays pass through a patient and then hit the CsI layer. The CsI crystals interact with the incoming x-rays, and in response, they emit visible light photons. This visible light is then detected by a photodetector or image receptor, and subsequently, the captured light is converted into an electronic signal to create a digital image.

The effectiveness of CsI as a scintillator makes it an excellent choice in imaging applications because it provides better spatial resolution and sensitivity compared to other materials. This conversion from x-ray to visible light is crucial for producing high-quality images in medical imaging modalities such as fluoroscopy, computed radiography, and flat-panel detectors.

While other functions mentioned in the options are relevant to the imaging process, they do not describe the primary role of CsI in digital imaging systems. Transforming light into electrons, acting as a storage medium for electrons, and directly detecting x-rays are related to other components of digital imaging systems, but