What term is used for a set of ray sums that are calculated in CT imaging?

The term used for a set of ray sums calculated in CT imaging is "Projection." In computed tomography, projections refer to the data collected during the scanning process, where X-rays pass through the body and a detector measures the amount of radiation that emerges. These projections are integral to creating images, as they represent the cumulative information from various angles around the patient.

In CT imaging, each projection corresponds to a specific angle of the X-ray beam and includes the measured values of attenuation as the beam interacts with different tissues. This information is crucial for generating cross-sectional images of the body. The projections are then processed to reconstruct detailed images of the internal structures.

While "Raw Data" could also relate to the initial data collected from the scans, it does not specifically denote the summed values from these ray measurements as clearly as "Projection" does. "Image Reconstruction" refers to the algorithmic process that converts these projections into a visual image, rather than the set of sums themselves. "Attenuation Map" represents the mapping of tissue densities based on how X-rays are attenuated, but again, does not describe the collection phase of ray sums in the way that "Projection" does.