title: Real-time optical measurement of the dynamic body surface for use in guided radiotherapy.
abstract: Optical measurements are increasingly used in radiotherapy. In this paper we present, in detail, the design and implementation of a multi-channel optical system optimized for fast, high spatial resolution, dynamic body surface measurement in guided therapy. We include all algorithmic modifications and calibration procedures required to create a robust, practical system for clinical use. Comprehensive static and dynamic phantom validation measurements in the radiotherapy treatment room show: conformance with simultaneously measured cone beam CT data to within 1 mm over 62% ± 8% of the surface and 2 mm over 90% ± 3%; agreement with the measured radius of a precision geometrical phantom to within 1 mm; and true real-time performance with image capture through to surface display at 23 Hz. An example patient dataset is additionally included, indicating similar performance in the clinic.
authors.affiliation: Developing Technologies, Christie Medical Physics and Engineering, The Christie NHS Foundation Trust, Manchester, UK. Gareth.Price@physics.cr.man.ac.uk
authors.forename: G J
authors.initials: GJ
authors.lastname: Price
authors.forename: J M
authors.initials: JM
authors.lastname: Parkhurst
authors.forename: P J
authors.initials: PJ
authors.lastname: Sharrock
authors.forename: C J
authors.initials: CJ
authors.lastname: Moore
mesh_terms: D001830:Body Surface Area; D002138:Calibration; D006801:Humans; D055620:Optical Phenomena; D019047:Phantoms, Imaging; D061089:Radiotherapy, Image-Guided / Q000379:methods*; D015203:Reproducibility of Results; D012984:Software; D013997:Time Factors