Advanced Physics for Brachytherapy 2018

Alternatives to TLD

➢ Systems used for single source dosimetry and especially QA: ion chambers, alanine, OSLDs, PSDs, film, …. i.e: Araki, F. et al., 2013. Measurement of absorbed dose-to-water for an HDR (192)Ir source with ionization chambers in a sandwich setup. Med. Phys., 40(9), p.092101. Sarfehnia, A., Kawrakow, I. & Seuntjens, J., 2010. Direct measurement of absorbed dose to water in HDR [sup 192]Ir brachytherapy: Water calorimetry, ionization chamber, Gafchromic film, and TG-43. Med. Phys., 37(4), p.1924. Adolfsson, E. et al., 2010. Response of lithium formate EPR dosimeters at photon energies relevant to the dosimetry of brachytherapy. Med. Phys., 37(9), p.4946. Schaeken, B. et al., 2011. Experimental determination of the energy response of alanine pellets in the high dose rate 192Ir spectrum. PMB, 56(20), pp.6625–34. Kolbun, N. et al., 2010. Experimental determination of the radial dose distribution in high gradient regions around 192Ir wires: comparison of electron paramagnetic resonance imaging, films, and Monte Carlo simulations. Med. Phys., 37(10), pp.5448–55. Chiu-Tsao, S.-T., Medich, D. & Munro, J., 2008. The use of new GAFCHROMIC EBT film for [sup 125]I seed dosimetry in Solid Water phantom. Med. Phys., 35(8), p.3787. Aldelaijan, S. et al., 2011. Radiochromic film dosimetry of HDR (192)Ir source radiation fields. Med. Phys., 38(11), pp.6074–83. Palmer, A.L. et al., 2013. Comparison of methods for the measurement of radiation dose distributions in high dose rate (HDR) brachytherapy: Ge-doped optical fiber, EBT3 Gafchromic film, and PRESAGE® radiochromic plastic. Med. Phys., 40(6), p.061707. Palmer, A.L., Lee, C., et al., 2013. Design and implementation of a film dosimetry audit tool for comparison of planned and delivered dose distributions in high dose rate (HDR) brachytherapy. PMB, 58(19), pp.6623–40. Palmer, A.L., Nisbet, A. & Bradley, D., 2013. Verification of high dose rate brachytherapy dose distributions with EBT3 Gafchromic film quality control techniques. PMB, 58(3), pp.497–511. ➢ Due to spatial measurement resolution, other limitations, and mainly level of development, TLD remains the method of choice for single source dosimetry. ➢ OSLDs, PSDs and alanines are also used for in-vivo and will be reviewed in the next lecture. ➢ What about 2D dosimetry using radiochromic films …?