Browse > Article

A Study on QA for Radiation Therapy Machine by Using Implemented Electronic Portal Imaging Device  

Lee, Dong-Hoon (Dept. of Biomedical Engineering, Tongmyong University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SC / v.43, no.6, 2006 , pp. 68-75 More about this Journal
Abstract
During cancer therapy by using high energy radiation, it is possible to improve the radiation therapy efficiency by performing a precise radiation therapy after verification of generated setup errors. In this paper, the video based electronic portal imaging device (EPID) which could display the portal image with near real time was developed to verify treatment position errors in radiation therapy instead of an analog typed portal film. This EPID system for applying QA tool of radiation therapy machine was consisted of a metal/fluorescent screen, $45^{\circ}$mirror, camera and image grabber. Radiation field verification has been performed to check quality assurance of the treatment machine itself by using this EPID system. The radiation field error was easily observed by edge detection of irradiated field size on EPID image when $0.6^{\circ}$ shift of collimator angle was generated. So, this implemented EPID system could be used as a radiation QA tool.
Keywords
EPID; QA;
Citations & Related Records
연도 인용수 순위
  • Reference
1 K. Luchka 'Assessing radiation and light field congruence with a video based electronic portal imaging device,' Med. Phy., Vol. 23(7), pp. 1245-1252, 1996   DOI   ScienceOn
2 A. C. Savard, E. B. Podgorsak, 'An electronic portal imaging device as a physics tool,' Medical Dosimetry, Vol. 22(2), pp. 101-105, 1997   DOI   ScienceOn
3 M. K. Islam, L. T. Fitzgerald, F. J. Bova, et al., 'A coded aperture device for on-line imaging with megavoltage photon beams,' Phys. Med. Biol., Vol. 38, pp. 1403-1418, 1993   DOI   ScienceOn
4 M. V. Herk, H. Meertens, 'A matrix ionisation chamber imaging device for on-line patient setup verification during radiotherapy,' Radiother. Oncol., Vol. 11, pp, 369-378, 1988   DOI   ScienceOn
5 T. R. McNutt, T. R. Mackie, B. R. Paliwal, 'Analysis and convergence of the iterative convolution/superposition dose reconstruction technic for multiple treatment beams and tomotherapy,' Med. Phys., Vol. 24(9), pp. 1465-1476, 1997   DOI   ScienceOn
6 P. Munro, J. A. Rawlinson, A. Fenster, 'A digital fluoroscopic imaging device for radiotherapy localization,' Int. J. Radiat. Oncol. Biol. Phys., Vol. 18, pp. 641-649, 1990   DOI   ScienceOn
7 J. Nielsen, S. H. Jensen, 'Some experimental and clinical lights on rotation therapy, its basis and possibilities,' Acta. Radiologic., Vol. 23, pp. 51-66, 1942   DOI
8 A. G. Haus, 'Historical developments in film processing and medical imaging, in Haus AG(ed) : Film processing and medical imaging,' Wisconsin, Medical Physics Publshing, 1993
9 S. Hamers, J. Freyschmidt, U. Neitzel, 'Digital radiography with a large-scale electronic flat-panel detector vs screen-film radiography: observer preference in clinical skeletal diagnostics,' Eur. Radiol. 11:1753-1759, 2001   DOI   ScienceOn
10 Terue Okamura, Saori Tanaka, et al. 'clinical evaluation of digital radiography based on a large-area cesium iodide-amorphous silicon flat-panel detector compared with screen-film radiography for skeletal system and abdomen,' Eur. Radiol. 12:1741-1747, 2002   DOI   ScienceOn
11 L. E. Antonuk, J. Boudry, W. Huang, et al., 'Demonstration of megavoltage and diagnostic x-ray imaging with hydrogenated amorphous silicon arrays,' Med. Phys., Vol. 19, pp. 1455-1466, 1992   DOI   ScienceOn
12 E. C. McCullough, K. P. McCollough, 'Improving agreement between radiation-delineated field edges on simulation and portal films : The edge tolerance test tool,' Med. Phys., Vol. 20, pp. 375-376, 1993   DOI   ScienceOn
13 A. L. Boyer, L. Antonuk, A. Fenster, et al. 'A review of electronic portal imaging devices (EPIDs),' Med. Phys., Vol. 19, pp. 1-16, 1992   DOI   ScienceOn
14 E. J. Morton, W. Swindell, D. G. Lewis, et al., 'A linear array, scintillation crystal-photodiode detector for megavoltage imaging,' Med. Phys., Vol. 18, pp. 681-691, 1991   DOI   ScienceOn
15 G. Barnea, E. Navon, A. Ginzburg, et al., 'Use of storage phosphor imaging plates in portal imaging and high-energy radiography: the intensifying effect of metallic screens on the sensitivity,' Med. Phys., Vol. 18, pp, 432-438, 1991   DOI   ScienceOn
16 K. S. Lam, M. Partowmah, W. C. Lam, 'An on-line electronic portal imaging system for external beam radiotherapy,' Br. J. Radiol., Vol. ？59, pp. 1007-1013, 1986   DOI   ScienceOn