Factors affecting the accuracy of respiratory tracking of the image-guided robotic radiosurgery system

Purpose To analyze the factors affecting the tracking accuracy of the CyberKnife Synchrony Respiratory Tracking System (SRTS). Materials and methods A dynamic motion phantom (motion phantom) reproduced the respiratory motions of each patient treated with the SRTS using a ball as the target. CyberKni...

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Bibliographic Details
Published in:Japanese journal of radiology 2019-10, Vol.37 (10), p.727-734
Main Authors: Inoue, Mitsuhiro, Okawa, Kohei, Taguchi, Junichi, Hirota, Yoshifumi, Yanagiya, Yohei, Kikuchi, Chie, Iwabuchi, Michio, Murai, Taro, Iwata, Hiromitsu, Shiomi, Hiroya, Koike, Izumi, Tatewaki, Koshi, Ohta, Seiji
Format: Article
Language:English
Subjects:
Accuracy
Adult
Aged
Aged, 80 and over
Average velocity
Camcorders
Cameras
Female
Humans
Imaging
Lung - diagnostic imaging
Lung - surgery
Lung Neoplasms - diagnostic imaging
Lung Neoplasms - surgery
Male
Medicine
Medicine & Public Health
Middle Aged
Motion
Multiple regression analysis
Nuclear Medicine
Original Article
Phantoms, Imaging
Radiology
Radiology, Interventional - methods
Radiosurgery
Radiosurgery - methods
Radiotherapy
Reproducibility of Results
Respiration
Robotic surgery
Robotic Surgical Procedures - methods
Tracking errors
Tracking systems
Tumors
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Summary:Purpose To analyze the factors affecting the tracking accuracy of the CyberKnife Synchrony Respiratory Tracking System (SRTS). Materials and methods A dynamic motion phantom (motion phantom) reproduced the respiratory motions of each patient treated with the SRTS using a ball as the target. CyberKnife tracked the ball using the SRTS, and this process was recorded by a video camera mounted on the linear accelerator head. The tracking error was evaluated from the images captured by the video camera. Multiple regression analysis was used to identify factors affecting tracking accuracy from 91 cases. Results The median tracking error was 1.9 mm (range 0.9–5.3 mm). Four factors affected the tracking accuracy: the average absolute amplitude of the tumor motion in the cranio-caudal (CC) direction ( p  = 0.007), average position gap due to the phase shift between the internal tumor and external marker positions in the CC direction ( p  
ISSN:1867-1071
1867-108X
DOI:10.1007/s11604-019-00859-7