What is receptor exposure defined as?

Receptor exposure refers specifically to the amount of radiation that strikes the image receptor, which can include various types of sensors used in imaging. This exposure plays a crucial role in determining the quality of the resulting images. An optimal receptor exposure ensures that the images have sufficient contrast and detail for accurate interpretation, while insufficient exposure may lead to underexposure, making it difficult to visualize internal structures.

The other options focus on different aspects of radiation and imaging. The amount of radiation absorbed by the patient pertains to patient dose and safety, while the total radiation emitted from the x-ray tube relates to the overall output of the equipment rather than what reaches the receptor specifically. The amount of radiation filtered out by the collimator indicates the radiation dose that is modified by the imaging setup but does not directly assess receptor exposure. Thus, option B accurately captures the essence of receptor exposure in the context of imaging.