Preliminary Characterisation of Fast Time-of-flight Cameras for Optical Surface Tracking in Advanced Radiotherapy

Publication Issue: 
Volume 39, Issue 2, 2018
Page No: 
Date Received: 
Friday, February 2, 2018
Authors' Name: 
S Y Lim
Hafiz M Zin
Authors' Affiliation and Address: 
Advanced Medical and Dental Institute, University Sains Malaysia, Bertam 13200 Kepala Batas, Pulau Pinang Malaysia
Fast time-of-flight camera is an optical 3D imaging sensor that provides the depth information of a scene at a high frame rate. The technology is useful in advanced radiotherapy treatment that requires real-time patient setup information during the conformal dose delivery. The objective of this study is to characterise two CMOS-based commercial ToF cameras of different pixel array size, frame rate and light source for application in radiotherapy. The paper focuses on warm-up time test, dark current test, temporal noise test and background illumination test of Argos P320 and P330 ToF cameras (Bluetechnix, Austria). The characterisation tests were performed for each camera and the results obtained were analysed using MatLab. Overall, both cameras have a low temporal noise of 0.22% and submillimetre distance measurement accuracy. The results provide the performance characteristics of the sensor and the factors that influence the depth measurement accuracy. Future work will focus on the characterisation of the ToF camera in tracking object motion.
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