ABSTRACT
Recently, surgical operations have sometimes been tried under laparoscopic video images using teleoperation robots or forceps manipulators. Therefore, in this paper, forceps manipulation efficiencies were evaluated when images for manipulation had some transmission delay (Experiment 1), and when the convergence point of the stereoscopic video cameras was either fixed and variable (Experiment 2). The operators' tasks in these experiments were sewing tasks which simulated telesurgery under 3-dimensional scenography. As a result of experiment 1, the operation at a 200+/-100 ms delay was kept at almost the same accuracy as that without delay. As a result of experiment 2, work accuracy was improved by using the zooming lens function; however the working time became longer. These results seemed to show the relation of a trade-off between working time and working accuracy.
Subject(s)
Clinical Competence , Surgical Instruments , Video-Assisted Surgery , Humans , Japan , Robotics , Surgical Procedures, OperativeABSTRACT
Augmented reality (AR) is anticipated for use in medical practice. However, virtual objects cannot be overlaid exactly on real objects using theoretical data. Therefore, this study is intended to determine the correction method to overlay a virtual object with real object accurately. Experimental results confirmed that differences of perceived depth position between real and virtual objects can be made negligible (within 1 mm on average) by correcting sizes of virtual objects such that they can be seen identically to the real object.
Subject(s)
Tomography, X-Ray Computed , User-Computer Interface , Computer Graphics , Humans , Japan , MaleABSTRACT
The relationship between the amount of rotation of the eyeball and the amount of rotation of the line of sight was investigated. The planar model and ellipsoidal model were compared as the trajectory of the center of the pupil. An evaluation of precision was carried out by measuring the discrepancy between the direction of the target and the estimated direction of the line of sight. The experimental results showed that the planar model was more precise than the ellipsoidal model. The center of rotation of the eyeball seems to translate along the oblique rotation of the eyeball.
