It's just like driving a car only with the information you can see and with your own sense.
You will feel unsecure and unsafe because not enough information is available.
It is like driving a car with the information from the left, right and back views using the rearview and side mirrors, in addition to the information of the front view.
You feel safe because you can drive a car with enough information of front, left, right, and back.
2D X-ray is one way shot, so no precise information acquired.
With 3D X-ray CT..,
3D X-ray CT data is taken from all
and rebuilt it to create an image data.
Cross sectional slices can be displayed freely in the 3D data from any directions, so that you can see its position and details in three dimensions! Wow!