caption: These photos shows four types of imaging equipment. Photo A, the results of a CT scan, shows 17 different transverse views of the skull, each taken at a different depth along the superior-inferior axis. The images are translucent, similar to an X ray, and are viewed on a light board. Photo B shows an MRI machine, which is a large drum into which lying patients enter via a conveyor belt. Photo C shows computer images of the body taken with PET scans. This produces anterior, lateral, posterior, and transverse views of the body that reveal the structure of the internal organs. Photo D shows an ultrasound readout, which is black and white. The image depicts solid tissues as light areas and empty space as dark areas. Some of the features of a young fetus can be seen in the empty space at the center of the image. The space containing the fetus is surrounded by the solid tissue of the uterus.
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