One study reports the use of alternative interaction devices for navigating through large CT data sets 12. However, despite the many stack-based viewers in use today, there has been very little research on the design of interaction techniques for stack mode viewers.
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So, although there are some efforts to develop 3D viewers for medical data, the vast majority of volumetric medical data is viewed as stacks of 2D slices. Their focus was the display method they used the same customized programmable keypad for navigation in every condition. They also observed differences in navigation patterns between the slice- by-slice and the stereoscopic displays. They found that the stereoscopic display provided higher detection and classification performance with less interpretation time but the differences were not statistically significant in their study of eight radiologists viewing a total of 91 anomalies. 11 compared three display techniques: a stereoscopic display, slice-by-slice, and maximum intensity projections (MIP), for detecting lung nodules from CT lung volumes. However, once the appropriate viewing orientation has been chosen from the 3D image, navigation through the set of 2D slices still requires the mouse to be used in regular 2D mode. Prototypes of this system have been judged to be useful by radiologists. The 3D mouse is built by using a standard mouse and an electromagnetic motion-tracking sensor.
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to provide rotational degrees of freedom.