What is the primary purpose of adjusting image receptor sizes?

The primary purpose of adjusting image receptor sizes is to accommodate various patient anatomies. Different patients have varying body sizes and shapes, which can impact how radiation interacts with tissues and how images are captured. By using appropriately sized image receptors, healthcare professionals can ensure that the entire area of interest is covered, providing a better fit for the patient's anatomy. This adjustment not only enhances the accuracy of the images but also helps in reducing unnecessary radiation exposure to surrounding tissues.

Options that suggest fitting different types of radiation or changing the speed of the film do not address the fundamental need for anatomical compatibility. The mention of improving image resolution relates to other factors, such as film quality and exposure settings, rather than simply the size of the image receptor. Thus, accommodating various patient anatomies remains the key reason for size adjustments in image receptors.