Ms. Mai Sasaki Profile

Mai Sasaki

at Chiba Univ

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Proceedings Article | 13 March 2009 Paper

Absolute length measurement using manually decided stereo correspondence for endoscopy

M. Sasaki, T. Koishi, T. Nakaguchi, N. Tsumura, Y. Miyake

Proceedings Volume 7261, 72610B (2009) https://doi.org/10.1117/12.811592

KEYWORDS: Endoscopy, Cameras, Sensors, Endoscopes, Calibration, Magnetic sensors, Magnetic tracking, Distortion, Magnetism, Photogrammetry

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In recent years, various kinds of endoscope have been developed and widely used to endoscopic biopsy, endoscopic operation and endoscopy. The size of the inflammatory part is important to determine a method of medical treatment. However, it is not easy to measure absolute size of inflammatory part such as ulcer, cancer and polyp from the endoscopic image. Therefore, it is required measuring the size of those part in endoscopy. In this paper, we propose a new method to measure the absolute length in a straight line between arbitrary two points based on the photogrammetry using endoscope with magnetic tracking sensor which gives camera position and angle. In this method, the stereo-corresponding points between two endoscopic images are determined by the endoscopist without any apparatus of projection and calculation to find the stereo correspondences, then the absolute length can be calculated on the basis of the photogrammetry. The evaluation experiment using a checkerboard showed that the errors of the measurements are less than 2% of the target length when the baseline is sufficiently-long.

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