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FIG 4. Multiple axial images from one subject (subject 2 from fig 3B) include corresponding MR image (left), CT scan (middle), and registered image (right) of the cervical spine at the level of the neural foramina (two levels). This was the format used by the three neuroradiologists to compare the clarity of conventional images (MR and CT studies side by side) with that of the registered images. The relationships between the margins of the neural foramina (solid arrow) and spinal canal (open arrow) and their contents, respectively, are more conspicuously delineated on the fused image. The images were registered using external fiducial landmarks
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