Using a Monolithic Active Pixel Sensor for Monitoring Multileaf Collimator Positions in Intensity Modulated Radiotherapy

Author

Page, Ryan F. ; Abbott, Natalie L. ; Davies, John ; Dyke, Emma L. ; Randles, Heather J. ; Velthuis, J.J. ; Fletcher, Sam ; Gregory, Shaun D. ; Hall, C. ; John, Anne-Marie ; Lawrence, H. ; Stevens, Paul H. ; Hugtenburg, Richard P. ; Tunbridge, Victoria

Author_Institution

H.H. Wills Phys. Lab., Univ. of Bristol, Bristol, UK

Volume

61

Issue

1

fYear

2014

fDate

Feb. 2014

Firstpage

74

Lastpage

78

Abstract

To enable in-vivo monitoring of Intensity Modulated Radiotherapy (IMRT) with minimal attenuation of the treatment field, an upstream camera system based on a Monolithic Active Pixel Sensor (MAPS) has been developed. This system has been used to precisely reconstruct the position of the Multileaf Collimators (MLC) that are used to shape the treatment field. The results show the position of a MLC is known with a precision of 6 μm with 10 seconds worth of data and 52 ±4 μm for a single frame.

Keywords

CMOS image sensors; biomedical equipment; collimators; radiation therapy; MAPS; MLC position precision; MLC position reconstruction; in-vivo IMRT monitoring; intensity modulated radiotherapy; minimal treatment field attenuation; monolithic active pixel sensor; multileaf collimator position monitoring; time 10 s; treatment field shaping; upstream camera system; Active pixel sensors; Attenuation; Cameras; Collimators; Educational institutions; Image reconstruction; Monitoring; CMOS image sensors; image sensors; oncology; radiation detectors; radiation imaging; silicon radiation detectors;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/TNS.2013.2287609

Filename

6704838