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ARRS, American
Roentgen Ray Society:
This computer exhibit demonstrates
the ease in which virtual colonoscopy can be performed
with direct endoscopic navigation using a real-time
volume rendering system. From CT images, the colon is
automatically segmented, a 3-D model is created and
its centerline is generated. Utilizing electronic bowel
cleansing, where oral contrast opacified fluid/stool
is automatically removed, dynamic flythroughs of the
colon are presented to the viewer in a cine format.
Guided navigation smoothly follows the centerline, as
a flight path, toward the end of colon. The direction
of navigation can be selected and the current distance
from the rectum displayed for all points along the centerline.
With real-time rendering at over 10 frames/sec, interactive
exploration navigation of the endoscopic views can analyze
the inside of the colon - even behind haustral folds
- and obtain accurate 3D measurements of suspicious
structures. The visualized colon surface can be marked
and measured during guided fly-through navigation. Areas
of the surface not directly viewed by the observer are
presented back to him or her for direct evaluation.
Suspected abnormalities could be further evaluated using
translucent rendering, a semi-transparent view beneath
the surface that represents structures of various densities
in different colors.
During the exhibit viewing times,
the author will be available for hands-on training to
interested attendees utilizing several dozen path-proven
cases. The system will also be available for self-tutoring
throughout the meeting.
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