Final answer:
In computed radiography, it is ideal to have the part centered to the exposure field and tightly collimated borders, which minimizes scatter radiation and maximizes image quality.
Step-by-step explanation:
In the context of computed radiography, it is crucial to have the anatomical part centered to the exposure field and tightly collimated borders. This practice reduces the scatter radiation, which can degrade image quality, and ensures that the patient receives the lowest possible radiation dose. Collimating closely to the area of interest enhances the contrast and detail of the image, making it easier to diagnose.
The technique described in the reference, involving the rotation of a Cobalt source of gamma radiation around the patient, is a method to concentrate a dose of radiation in a tumor during radiotherapy. Such precision is also critical in diagnostic radiology, with computed radiography requiring precise collimation to ensure that only the area of interest is exposed, thereby focusing the diagnosis and protecting surrounding tissues.