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| Implementing Movement Parallax for Laparoscopy - Validating manipulation |
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| Experimentally it was shown that moving the laparoscope around the point where it enters the abdomen, making use of the laparoscope's fish eye lens, creates the
looked for parallax shifts to allow the surgeon to obtain information about the spatial structure; depth percpetion. Not tested yet was wether this adds to his/her
ability to manipulate. This was experimentally validated in a laboratory set-up using a so-called trainer (thank you John Flach for the idea for the simpe construction). |
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| Subjects were asked to perform two tasks: first an observation task: to solve the know (see upper row of images below). The knot was constructed from three wires, one of which terminating
in a loop. The observation task was to indicate which of the roots terminates in the loop. Second, subjects were asked to move a needle through the loop without touching it
(see lower row of images below). There were two conditions: the active condition; with a link between motions of the laparoscope and the head movements of the surgeon,
and the passive condition, without a link. Measured was time and performance (correctly solved knot, number to times the loop was touched) |
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| Results showed no time difference between the active and passive condition. However, performance both for the observation and manipulation task for the
active condition exceeded the passive condition. This showed that the proposed link between head movement of the surgeon and motions of the laparoscope adds to the surgeons
perception of the spatial perception, positively influencing the performance of manipulation. |
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