Define the term "image receptor" in the context of radiology.

In radiology, the term "image receptor" specifically refers to a device that captures X-ray photons after they have penetrated the patient’s body. This process is crucial because the image receptor transforms the incoming radiation into a visible image, which can then be analyzed by radiologists or other medical professionals to diagnose and monitor medical conditions.

By capturing the X-ray photons, the image receptor plays an essential role in the imaging process, influencing the quality and clarity of the resultant images. Common types of image receptors include film-based systems and digital detectors, each operating on the principle of detecting radiation and converting it into a format that can be viewed and interpreted.

The other options describe related concepts but do not accurately define what an image receptor is. The device that creates the X-ray beams is a separate component essential for producing the X-rays, while a tool for measuring radiation levels is unrelated to image capture. Lastly, a system for processing film-based images refers to the methods used to develop and enhance images post-capture, rather than the device that actually captures the X-ray exposure.