In nuclear medicine 3D images are typical (PET, SPECT), the 4th dimension would be time (4D) as incorporated in dynamic tracer studies (3D image sets taken over a period of time durning one scanning session). Hope this helps.
Satish Narula - I'm not quite sure what you're asking. In medical imaging, there is different levels of resolution for radiographs, CT, MRI, ultrasound, and nuclear medicine PET and SPECT examinations along with concepts of spatial resolution, tissue contrast, and others. As Robert C Miner indicated, the "4D" aspect of this is something else than the x, y, and z resolutions. I've heard people use 5D when incorporating 2 additional aspects in MRI and I'm sure people have gone beyond this. I could probably say something is 10-D in MRI or US if incorporating a number of external factors, but it's not necessarily increasing the spatial/contrast resolution, just visualizing the data differently with paired external factors. The 4D in prenatal ultrasound is certainly used in medical literature and has meaning but the term is also used as a marketing factor.
In dentistry, we have 3D facial soft tissue scan, 3D CBCT image and 3D STL image of the teeth interlying with each other.
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