Browse > Article
http://dx.doi.org/10.17946/JRST.2020.43.6.431

A Study on the Construction of MVCT Dose Calculation Model by Using Dosimetry Check™  

Um, Ki-Cheon (Department of Radiation Oncology, Asan Medical Center)
Kim, Chang-Hwan (Department of Radiation Oncology, Asan Medical Center)
Jeon, Soo-Dong (Department of Radiation Oncology, Asan Medical Center)
Back, Geum-Mun (Department of Radiation Oncology, Asan Medical Center)
Publication Information
Journal of radiological science and technology / v.43, no.6, 2020 , pp. 431-441 More about this Journal
Abstract
The purpose of this study was to construct a model of MVCT(Megavoltage Computed Tomography) dose calculation by using Dosimetry Check™, a program that radiation treatment dose verification, and establish a protocol that can be accumulated to the radiation treatment dose distribution. We acquired sinogram of MVCT after air scan in Fine, Normal, Coarse mode. Dosimetry Check™(DC) program can analyze only DICOM(Digital Imaging Communications in Medicine) format, however acquired sinogram is dat format. Thus, we made MVCT RC-DICOM format by using acquired sinogram. In addition, we made MVCT RP-DICOM by using principle of generating MLC(Multi-leaf Collimator) control points at half location of pitch in treatment RP-DICOM. The MVCT imaging dose in fine mode was measured by using ionization chamber, and normalized to the MVCT dose calculation model, the MVCT imaging dose of Normal, Coarse mode was calculated by using DC program. As a results, 2.08 cGy was measured by using ionization chamber in Fine mode and normalized based on the measured dose in DC program. After normalization, the result of MVCT dose calculation in Normal, Coarse mode, each mode was calculated 0.957, 0.621 cGy. Finally, the dose resulting from the process for acquisition of MVCT can be accumulated to the treatment dose distribution for dose evaluation. It is believed that this could be contribute clinically to a more realistic dose evaluation. From now on, it is considered that it will be able to provide more accurate and realistic dose information in radiation therapy planning evaluation by using Tomotherapy.
Keywords
Imaging Dose; MVCT Dose Calculation Model; Dosimetry $Check^{TM}$; RC-DICOM Modification; RP-DICOM Modification; Output Calibration;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Stroom J, Heijmen B. Geometrical uncertainties, radiotherapy planning margins, and the ICRU-62 report. Radiotherapy and Oncology. 2002;64(1):75-83.   DOI
2 Sheng K, Chow J, Hunter G, Larner J. Read P. Is daily computed tomography image guidance necessary for nasal cavity and nasopharyngeal radiotherapy? An investigation based on helical tomotherapy. Journal of Applied Clinical Medical Physics. 2008;9(1):36-46.   DOI
3 Chao E, Lucas D, Ruchala K, Olivera G. Evaluation of a thinner-slice MVCT scan mode across several systems. AAPM Annual Meeting. 2010;37(6-9):3152.
4 Chen M, Chao E, Lu W. Quantitative characterization of tomotherapy MVCT Dosimetry. Medical Dosimetry. 2013;38(3):280-6.   DOI
5 Shah AP, Langen KM, Ruchala KJ, Cox A, Kupelian PA, Meeks SL. Patient dose from megavoltage computed tomography imaging. International Journal of Radiation Oncology Biology Physics. 2008;70(5):1579-87.   DOI
6 Kim JH, Bae SH. The effect of patients positioning system on the prescription dose in radiation therapy. Journal of Radiological Science and Technology. 2017;40(4):613-20.   DOI
7 Chung EA, Kwon DY, Park TY, Chung YS. Clinical implementation of dosimetry CheckTM for TomoTherapy® delivery quality assurance. J Appl Clin Med Phys. 2018;19(6):193-9.   DOI
8 Kissick MW, Fenwick J, James JA, Jeraj R, Kapatoes JM, Keller H, et al. The helical tomotherapy thread effect. Am Assoc Phys Med. 2005;32(5): 1414-23.
9 Borca VC, Pasquino M, Russo G, Grosso P, Cante D, Sciacero P, et al. Dosimetric characterization and use of GAFCHROMIC EBT3 film for IMRT dose verification. J Appl Clin Med Phys. 2013;14(2): 158-71.   DOI
10 Report of Korean Statistical Information Service (KOSIS), 2020.
11 Michael T, Louis S, Paul O. Normal tissue tolerance dose metrics for radiation therapy of major organs. Semin Radiat Oncol. 2007;17(2):131-40.   DOI
12 Cox JD, Stetz JA, Pajak TF. Toxicity criteria of the Radiation Therapy Oncology Group(RTOG) and the european organization for research and treatment of cancer (EORTC). Int J Radiation Oncology Biol Phys. 1995;31(5):1341-6.   DOI
13 Vanetti E, Clivio A, Nicolini G, Fogliata A, Ghosh-Laskar S, Agarwal JP, et al. Volumetric modulated arc radiotherapy for carcinomas of the oro-pharynx, hypopharynx and larynx: A treatment planning comparison with fixed field IMRT. Radiotherapy & Oncology. 2009;92(1):111-7.   DOI
14 Teoh M, Clark CH, Wood K, Whitaker S, Nisbet A. Volumetric modulated arc therapy: A review of current literature and clinical use in practice. British Journal of Radiology. 2011;84(1007):967-96.   DOI
15 Huang K, Palma DA, Scott D, McGregor D, Gaede S, Yartsev S, et al. Inter- and intrafraction uncertainty in prostate bed image-guided radiotherapy. International Journal of Radiation Oncology*Biology*Physics. 2012;84(2):402-7.   DOI