Final answer:
CT scan is the preferred imaging modality for diagnosing scaphoid fractures.
Step-by-step explanation:
When it comes to diagnosing scaphoid fractures, CT scan is the preferred imaging modality. This is because CT scans are excellent at visualizing bone structures and can accurately detect fractures in the scaphoid bone. MRI, on the other hand, is not the preferred choice for diagnosing scaphoid fractures as it is less effective in detecting breaks in the bone. Both CT and MRI can be used for other purposes, but for diagnosing scaphoid fractures, CT scan is the recommended option.