Evaluation of technical performance of optical surface imaging system using conventional and novel stereotactic radiosurgery algorithms

The Catalyst HD (C‐RAD Positioning AB, Uppsala, Sweden) optical surface imaging (OSI) system is able to manage interfractional patient positioning, intrafractional motion monitoring, and non‐contact respiratory gating without x‐ray exposure for radiation therapy. In recent years, a novel high‐precis...

Full description

Saved in:
Bibliographic Details
Published in:Journal of applied clinical medical physics 2021-02, Vol.22 (2), p.58-68
Main Authors: Kojima, Hironori, Takemura, Akihiro, Kurokawa, Shogo, Ueda, Shinichi, Noto, Kimiya, Yokoyama, Haruna, Takamatsu, Shigeyuki
Format: Article
Language:English
Subjects:
Accuracy
Algorithms
Cameras
Laboratories
optical surface imaging system
Patient positioning
positioning
Radiation Oncology Physics
Radiosurgery
Registration
Scanners
stereotactic radiosurgery (SRS)
surface‐guided radiation therapy (SGRT)
Thorax
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The Catalyst HD (C‐RAD Positioning AB, Uppsala, Sweden) optical surface imaging (OSI) system is able to manage interfractional patient positioning, intrafractional motion monitoring, and non‐contact respiratory gating without x‐ray exposure for radiation therapy. In recent years, a novel high‐precision surface registration algorithm for stereotactic radiosurgery (SRS algorithm) has been released. This study aimed to evaluate the technical performance of the OSI system using rigid phantoms, by comparing the conventional and SRS algorithms. To determine the system’s technical performance, isocenter displacements were calculated by surface image registration via the OSI system using head, thorax, and pelvis rigid phantoms. The reproducibility of positioning was evaluated by the mean value calculated by repeating the registration 10 times, without moving each phantom. The accuracy of positioning was evaluated by the mean value of the residual error, where the 10 offset values given to each phantom were subtracted from the isocenter displacement values. The stability of motion monitoring was evaluated by measuring isocenter drift during 20 min and averaging it over 10 measurements. For the head phantom, all tests were compared with the mask types and algorithms. As a result, for all sites and both algorithms, the reproducibility, accuracy, and stability for translation and rotation were
ISSN:1526-9914
1526-9914
DOI:10.1002/acm2.13152