Hostname: page-component-848d4c4894-nr4z6 Total loading time: 0 Render date: 2024-05-11T16:30:38.057Z Has data issue: false hasContentIssue false
  • English
  • Français

To determine the source dwell positions of HDR brachytherapy using 2D 729 ion chamber array

Published online by Cambridge University Press:  26 August 2015

S. A. Syam Kumar ,
Sitha P. Gangadharan ,
Aswathi P. Cheruparambil ,
Anjana T. Parakat  and
Aparna Perumangat
S. A. Syam Kumar*
Affiliation:
Department of Radiation Oncology, Division of Radiation Physics, Malabar Cancer Centre, Thalassery, Kerala, India
Sitha P. Gangadharan
Affiliation:
Department of Physics, University of Calicut, Calicut, Malappuram, Kerala, India
Aswathi P. Cheruparambil
Affiliation:
Department of Physics, University of Calicut, Calicut, Malappuram, Kerala, India
Anjana T. Parakat
Affiliation:
Department of Physics, University of Calicut, Calicut, Malappuram, Kerala, India
Aparna Perumangat
Affiliation:
Department of Physics, University of Calicut, Calicut, Malappuram, Kerala, India
*
Correspondence to: S. A. Syam Kumar, Department of Radiation Oncology, Malabar Cancer Centre, Division of Radiation Physics, Thalassery, Kerala 670103, India. Tel: 91 996 144 3954. E-mail: syam.ppm@gmail.com
Get access Rights & Permissions [Opens in a new window]

Abstract

The purpose of this study was to determine the dwell position of a high-dose-rate (HDR) brachytherapy Ir-192 source using a PTW Seven29 2D detector array. A Nucletron Microselectron HDR device and 2D array ionisation chamber, equipped with 729 ionisation chambers uniformly arranged in a 27×27 matrix with an active array area of 27×27 cm2, were used for this study. Different dwell positions were assigned in the HDR machine. Rigid interstitial needles and a vaginal applicator were positioned on the 2D array, which was then exposed according to the programmed dwell positions. Subsequently, the positional accuracy of the source position was analysed. This process was repeated for different dwell positions. The results were analysed using an in-house-developed Excel programme. Different random dwell position checks as well as dwell position measurements were performed using a radiochromic film. The dwell positions measured by the 2D array were found to be in good agreement with those measured by the film. The standard deviations between the doses obtained from the different dwell positions were 0·191828, 0·329973, 0·370632 and 0·779939, whereas the corresponding standard deviations of the doses at the vaginal cylinder were 0·60303, 0·242808, 0·242808 and 0·065309. When the planned and measured dwell positions were plotted, a linear relationship was obtained.

Keywords

afterloadingapplicatorsHDR brachytherapy2D array
Type
Original Articles
Information
Journal of Radiotherapy in Practice , Volume 14 , Issue 4 , December 2015 , pp. 403 - 409
Check for updates
Copyright
© Cambridge University Press 2015 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1.Manikandan, A, Sarkar, B, David Perianayagam, A, Holla, R, Vivek, T R, Sujatha, N. Relative dosimetrical verification in high dose rate brachytherapy using two-dimensional detector array IMatriXX 2011. J Med Phys. 2011; 36(3): 171–175.CrossRefGoogle Scholar
2.Bradley, B. Source tracking and quality assurance of high dose rate (HDR) brachytherapy 2014. Thesis collection of Wollongong university Center for medical radiation physics 2014. http://ro.uow.edu.au/theses/4048.Google Scholar
3.Rickey, D W, Sasaki, D, Bews, J. A quality assurance tool for high dose rate brachytherapy. Med Phys 2010; 37: 2525–2532.CrossRefGoogle ScholarPubMed
4.Stitt, J A. High dose rate brachytherapy in the treatment of cervical carcinoma. Hematol Oncol Clin North Am 1999; 13 (3): 585–593.CrossRefGoogle ScholarPubMed
5.Palmer, A, Bradley, D, Nisbet, A. Physics-aspects of dose accuracy in high dose rate (HDR) brachytherapy: source dosimetry, treatment planning, equipment performance and in vivo verification techniques. Journal of Contemporary Brachytherapy 2012; 4 (2).CrossRefGoogle Scholar
6.Palmer, A, Bradley, D, Nisbet, A. Physics-aspects of dose accuracy in high dose rate (HDR) brachytherapy: source dosimetry, treatment planning, equipment performance and in vivo verification techniques. J Contemp Brachytherapy 2012; 4 (2): 81–91.CrossRefGoogle ScholarPubMed
7.Aldrich, J E, Samant, S S. An integrated phantom for HDR quality control. Br J Radiol 1993; 66: 363–365.CrossRefGoogle ScholarPubMed
8.Stitt, J A. High dose rate brachytherapy in the treatment of cervical carcinoma. Hematol Oncol Clin North Am 1999; 13 (3): 585–593.CrossRefGoogle ScholarPubMed
9.Fleming, P, Nisar, S, Neblett, Det al. Description of an afterloading 192 Ir interstitial-intracavitary technique in the treatment of carcinoma of the vagina. Obstet Gynecol 1980; 55 (4): 403–531.Google Scholar
10.Breithuth, F, Schiefer, H, Arn, M, Peters, S, Seelentag, W. Determination of the source dwell position of an afterloading device with a detector array. J Radiat Oncol Inform 2011; 3 (1): 12–24.CrossRefGoogle Scholar
11.Fleming, P, Nisar, S, Neblett, Det al. Description of an afterloading 192 Ir interstitial-intracavitary technique in the treatment of carcinoma of the vagina. Obstet Gynecol 1980; 55 (4): 403–531.Google Scholar
12.Wayne, New Jersey. Reference dosimetry using radiochromic film. Département de Radio-Oncologie, Centre hospitalier de l’Université de Montréal (CHUM), Montréal, Québec, and Département de Physique, Université de Montréal, Montréal, Québec, Canada.Google Scholar
13.Sharma, S D, Bianchi, C, Conte, Let al. Radiochromic film measurement of anisotropy function for high-dose-rate Ir-192 brachytherapy source. Phys Med Biol 2004; 49: 4065–4072.CrossRefGoogle ScholarPubMed
14.Karaiskos, P, Angelopoulos, A, Sakelliou, Let al. Monte Carlo and TLD dosimetry of an 192Ir high dose-rate brachytherapy source. Med Phys 1998; 25: 1975–1984.CrossRefGoogle ScholarPubMed