Energy dependence of GafChromic LD-V1 film dose response to X-ray photons in the 60 to 180 kV range

• Autorzy: Mbewe Jonathan

Identyfikatory

DOI

10.2478/pjmpe-2024-0006

• Języki publikacji: EN

Abstrakty

EN

Introduction: Radiochromic film (RCF) is suitable for use as a dosimeter owing to its inherently superior spatial resolution and near-water equivalence. A new model of RCF recommended for measuring imaging dose in the kV nominal energy range was recently introduced onto the market. In this study, we investigate the dependence on the beam quality of GafChromic LD-V1 film’s radiation dose response. Material and methods: Pieces of LD-V1 film were irradiated to air kerma ranging from 0 to 570 mGy in X-ray photons with beam qualities of 60 kV (HVL = 1.32 mm Al), 100 kV (HVL = 2.83 mm Al), 120 kV (HVL = 5.11 mm Al), 150 kV (HVL = 6.23 mm Al), and 180 kV (HVL = 0.54 mm Cu). The net reflectance from each film was obtained from a color flatbed scanner. For each beam quality, an analytical power function was fitted to the net reflectance - air kerma relationship and tested for differences. Results: We have found that for the beam qualities investigated, the response of the Gafchromic LD-V1 film was not significantly dependent on energy, and a single calibration curve could be used. The total relative uncertainty and absolute error reached maxima of 18% and 80%, respectively for air kerma values less than 50 mGy, and remained below 10% for air kerma in the range 50 mGy to 570 mGy. Conclusions: The results of our investigation revealed that the response of Gafchromic LD-V1 film is not significantly dependent on beam quality. A minimum air kerma irradiation of 50 mGy is recommended to minimise uncertainty.

Słowa kluczowe

EN

imaging dose; radiochromic film; Gafchromic LD-V1; Radcal 10X6-6

• Wydawca: Polskie Towarzystwo Fizyki Medycznej ; De Gruyter
• Czasopismo: Polish Journal of Medical Physics and Engineering
• Rocznik: 2024
• Tom: Vol. 30, Iss. 2
• Strony: 44--51
• Opis fizyczny: Bibliogr. 18 poz., rys., tab.

Twórcy

autor

Mbewe Jonathan

• Division of Medical Physics, Groote Schuur Hospital/University of Cape Town, South Africa

• https://orcid.org/0000-0003-1550-9478

Bibliografia

• 1. Michalski A, Atyeo J, Cox J, Rinks M, Morgia M, Lamoury G. A dosimetric comparison of 3D-CRT, IMRT, and static tomotherapy with an SIB for large and small breast volumes. Medical Dosimetry. 2014;39(2):163-168. https://doi.org/10.1016/j.meddos.2013.12.003
• 2. Den RB, Doemer A, Kubicek G, et al. Daily Image Guidance With Cone-Beam Computed Tomography for Head-and-Neck Cancer Intensity-Modulated Radiotherapy: A Prospective Study. International Journal of Radiation Oncology*Biology*Physics. 2010;76(5):1353-1359. https://doi.org/10.1016/j.ijrobp.2009.03.059
• 3. Ding GX, Alaei P, Curran B, et al. Image guidance doses delivered during radiotherapy: Quantification, management, and reduction: Report of the AAPM Therapy Physics Committee Task Group 180. Medical Physics. 2018;45(5). https://doi.org/10.1002/mp.12824
• 4. Giaddui T, Cui Y, Galvin J, Yu Y, Xiao Y. Comparative dose evaluations between XVI and OBI cone beam CT systems using Gafchromic XRQA2 film and nanoDot optical stimulated luminescence dosimeters. Medical Physics. 2013;40(6Part1):062102-1-12. https://doi.org/10.1118/1.4803466
• 5. Brunner CC, Stern SH, Minniti R, Parry MI, Skopec M, Chakrabarti K. CT head-scan dosimetry in an anthropomorphic phantom and associated measurement of ACR accreditation-phantom imaging metrics under clinically representative scan conditions. Med Phys. 2013;40(8):081917. https://doi.org/10.1118/1.4815964
• 6. Ernst M, Manser P, Dula K, Volken W, Stampanoni MF, Fix MK. TLD measurements and Monte Carlo calculations of head and neck organ and effective doses for cone beam computed tomography using 3D Accuitomo 170. Dentomaxillofacial Radiology. 2017;46(7):20170047. https://doi.org/10.1259/dmfr.20170047
• 7. Al‐Senan RM, Hatab MR. Characteristics of an OSLD in the diagnostic energy range. Medical Physics. 2011;38(7):4396-4405. https://doi.org/10.1118/1.3602456
• 8. Davis SD, Ross CK, Mobit NP, Van der Zwan L, Chase WJ, Shortt KR. The response of lif thermoluminescence dosemeters to photon beams in the energy range from 30 kV x rays to 60Co gamma rays. Radiation Protection Dosimetry. 2003;106(1):33-43. https://doi.org/10.1093/oxfordjournals.rpd.a006332
• 9. Nunn AA, Davis SD, Micka JA, DeWerd LA. LiF:Mg,Ti TLD response as a function of photon energy for moderately filtered x‐ray spectra in the range of 20–250 kVp relative to. Medical Physics. 2008;35(5):1859-1869. https://doi.org/10.1118/1.2898137
• 10. Reitz I, Hesse BM, Nill S, Tücking T, Oelfke U. Enhancement of image quality with a fast iterative scatter and beam hardening correction method for kV CBCT. Zeitschrift für Medizinische Physik. 2009;19(3):158-172. https://doi.org/10.1016/j.zemedi.2009.03.001
• 11. Tomic N, Devic S, DeBlois F, Seuntjens J. Reference radiochromic film dosimetry in kilovoltage photon beams during CBCT image acquisition. Medical Physics. 2010;37(3):1083-1092. https://doi.org/10.1118/1.3302140
• 12. Tomic N, Quintero C, Whiting BR, et al. Characterization of calibration curves and energy dependence GafChromicTM XR-QA2 model based radiochromic film dosimetry system. Med Phys. 2014;41(6Part1):062105. https://doi.org/10.1118/1.4876295
• 13. Nakajima E, Sato H. Characterization of a new radiochromic film (LD-V1) using mammographic beam qualities. Zeitschrift für Medizinische Physik. Published online June 2023. https://doi.org/10.1016/j.zemedi.2023.05.004
• 14. Radcal Corporation. Accessed September 13, 2023. https://radcal.com/wp-content/uploads/2016/10/radcal-10X6-6-chamber-spec-sheet.pdf
• 15. Niroomand‐Rad A, Chiu‐Tsao S, Grams MP, et al. Report of AAPM Task Group 235 Radiochromic Film Dosimetry: An Update to TG‐55. Medical Physics. 2020;47(12):5986-6025. https://doi.org/10.1002/mp.14497
• 16. Devic S, Seuntjens J, Sham E, et al. Precise radiochromic film dosimetry using a flat-bed document scanner. Med Phys. 2005;32(7Part1):2245-2253. https://doi.org/10.1118/1.1929253
• 17. Bouchard H, Lacroix F, Beaudoin G, Carrier J, Kawrakow I. On the characterization and uncertainty analysis of radiochromic film dosimetry. Medical Physics. 2009;36(6Part1):1931-1946. https://doi.org/10.1118/1.3121488
• 18. Ashland Inc. Who has pinpoint precision for critical analysis? Ashland Inc. Accessed January 12, 2023. https://www.ashland.com/file_source/Ashland/Documents/PHA22-039_Gafchromic_LDV1_brochure_060322.pdf