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 IJMPCERO  Vol.7 No.1 , February 2018
Comparison of Gamma Pass Rate between the Dose-to-Water and Dose-to-Medium Reporting Modes for Patient-Specific QA Using a Helical Diode Array Dosimeter with a Fixed Phantom Density
Abstract: Introduction: To compare the measured dose distributions to calculated ones in dose-to-water (Dw) and dose-to-medium (Dm) reporting modes for simple plans and patient-specific intensity modulated radiation therapy (IMRT) and volumetric modulated arc therapy (VMAT) plans using ArcCHECK with a fixed phantom density. Methods: The recommended density value of 1.18 g/cm3 for Acuros XB and X-ray voxel Monte Carlo was assigned to ArcCHECK on CT images. A total of 45 simple plans, including a 1-field plan, a 3-field plan, a 4-field plan, a half-arc plan from 270° to 90°, and a full-arc plan, were assessed. Subsequently, the patient-specific 96 IMRT and VMAT plans were evaluated. Gamma analysis with a 3% normalized global dose error and a 3 mm distance-to-agreement criteria (γ3%G/3mm) was performed in the Dw and Dm. The change in γ3%G/3mm between Dw and Dm were statistically analyzed using JMPPro11 software. Results: The median values of γ3%G/3mm for all simple plans for Dw and Dm were 98.1% (range, 75.2% - 100%) and 95.5% (range, 23.7% - 100%), respectively (p < 0.01). In the patient-specific IMRT and VMAT plans, the median values of γ3%G/3mm for Dw and Dm were 98.6% (range, 90.1% - 100%) and 90.5% (range, 38.5% - 97.2%), respectively (p < 0.01). Conclusion: Our results showed that the calculated and measured dose distributions were in good agreement for Dw, but were not for Dm. From the viewpoint of the rationale of dosimetry, Dw shows better agreement with measured dose distribution when using the fixedphantom density recommended by the vendor.
Cite this paper: Hirashima, H. , Nakamura, M. , Ishihara, Y. , Mukumoto, N. , Akimoto, M. , Tomita, T. , Hirose, Y. , Kitsuda, K. , Ishigaki, T. and Mizowaki, T. (2018) Comparison of Gamma Pass Rate between the Dose-to-Water and Dose-to-Medium Reporting Modes for Patient-Specific QA Using a Helical Diode Array Dosimeter with a Fixed Phantom Density. International Journal of Medical Physics, Clinical Engineering and Radiation Oncology, 7, 74-86. doi: 10.4236/ijmpcero.2018.71007.
References

[1]   Nutting, C.M., Morden, J.P., Harrington, K.J., et al. (2011) Parotid-Sparing Intensity Modulated versus Conventional Radiotherapy in Head and Neck Cancer (PARSPORT): A Phase 3 Multicentre Randomised Controlled Trial. The Lancet Oncology, 12, 127-136.
https://doi.org/10.1016/S1470-2045(10)70290-4

[2]   Wolff, D., Stieler, F., Welzel, G., et al. (2009) Volumetric Modulated Arc Therapy (VMAT) vs. Serial Tomotherapy, Step-and-Shoot IMRT and 3D-Conformal RT for Treatment of Prostate Cancer. Radiotherapy and Oncology, 93, 226-233.
https://doi.org/10.1016/j.radonc.2009.08.011

[3]   Kry, S.F., Molineu, A., Kerns, J.R., et al. (2014) Institutional Patient-Specific IMRT QA Does Not Predict Unacceptable Plan Delivery. International Journal of Radiation Oncology * Biology * Physics, 90, 1195-1201.
https://doi.org/10.1016/j.ijrobp.2014.08.334

[4]   Failla, G., Wareing, T., Archambault, Y., et al. (2010) Acuros® XB Advanced Dose Calculation for the EclipseTM Treatment Planning System [White Paper].

[5]   Han, T., Mikell, J.K., Salehpour, M.R., et al. (2011) Dosimetric Comparison of Acuros XB Deterministic Radiation Transport Method with Monte Carlo and Model-Based Convolution Methods in Heterogeneous Media. Medical Physics, 38, 2651-2664.
https://doi.org/10.1118/1.3582690

[6]   Tsuruta, Y., Nakata, M., Nakamura, M., et al. (2014) Dosimetric Comparison of Acuros XB, AAA, and XVMC in Stereotactic Body Radiotherapy for Lung Cancer. Medical Physics, 41, 081715.
https://doi.org/10.1118/1.4890592

[7]   Lloyd, S.A.M. and Ansbacher, W. (2013) Evaluation of an Analytic Linear Boltzmann Transport Equation Solver for High-Density Inhomogeneities. Medical Physics, 40, 117072.

[8]   Siebers, J.V., Keall, P.J., Nahum, A.E., et al. (2000) Converting Absorbed Dose to Medium to Absorbed Dose to Water for Monte Carlo Based Photon Beam Dose Calculations. Physics in Medicine & Biology, 45, 983-995.
https://doi.org/10.1088/0031-9155/45/4/313

[9]   Han, T., Followill, D., Mikell, J., et al. (2013) Dosimetric Impact of Acuros XB Deterministic Radiation Transport Algorithm for Heterogeneous Dose Calculation in Lung Cancer. Medical Physics, 40, 051710.
https://doi.org/10.1118/1.4802216

[10]   Zhen, H., Hrycushko, B., Lee, H., et al. (2015) Dosimetric Comparison of Acuros XB with Collapsed Cone Convolution/Superposition and Anisotropic Analytic Algorithm for Stereotactic Ablative Radiotherapy of Thoracic Spinal Metastases. Journal of Applied Clinical Medical Physics, 16, 181-192.
https://doi.org/10.1120/jacmp.v16i4.5493

[11]   Mampuya, W.A., Nakamura, M., Hirose, Y., et al. (2016) Difference in Dose-Volumetric Data between the Analytical Anisotropic Algorithm, the Dose-To-Medium, and the Dose-To-Water Reporting Modes of the Acuros XB for Lung Stereotactic Body Radiation Therapy. Journal of Applied Clinical Medical Physics, 17, 341-347.
https://doi.org/10.1120/jacmp.v17i5.6338

[12]   Kan, M.W.K., Leung, L.H.T., So, R.W.K., et al. (2013) Experimental Verification of the Acuros XB and AAA Dose Calculation Adjacent to Heterogeneous Media for IMRT and RapidArc of Nasopharygeal Carcinoma. Medical Physics, 40, 031714.
https://doi.org/10.1118/1.4792308

[13]   Chetty, I.J., Curran, B., Cygler, J.E., et al. (2007) Report of the AAPM Task Group No. 105: Issues Associated with Clinical Implementation of Monte Carlo-Based Photon and Electron External Beam Treatment Planning. Medical Physics, 34, 4818-4853.
https://doi.org/10.1118/1.2795842

[14]   Liu, H.H., Keall, P. and Hendee, W.R. (2002) Dm Rather than Dw Should Be Used in Monte Carlo Treatment Planning. Medical Physics, 29, 922-924.
https://doi.org/10.1118/1.1473137

[15]   Dogan, N., Siebers, J.V., Keall, P.J. (2006) Clinical Comparison of Head and Neck and Prostate IMRT Plans Using Absorbed Dose to Medium and Absorbed Dose to Water. Physics in Medicine & Biology, 51, 4967-4980.
https://doi.org/10.1088/0031-9155/51/19/015

[16]   Usmani, M.N., Masai, N., Oh, R.-J., et al. (2014) Comparison of Absorbed Dose to Medium and Absorbed Dose to Water for Spine IMRT Plans Using a Commercial Monte Carlo Treatment Planning System. International Journal of Medical Physics, Clinical Engineering and Radiation Oncology, 3, 60-66.
https://doi.org/10.4236/ijmpcero.2014.31010

[17]   Andreo, P. C. (2015) Dose to “water-like” Media or Dose to Tissue in MV Photons Radiotherapy Treatment Planning: Still a Matter of Debate. Physics in Medicine & Biology, 60, 309-337.
https://doi.org/10.1088/0031-9155/60/1/309

[18]   Létourneau, D., Publicover, J., Kozelka, J., et al. (2009) Novel Dosimetric Phantom for Quality Assurance of Volumetric Modulated Arc Therapy. Medical Physics, 36, 1813-1821.
https://doi.org/10.1118/1.3117563

[19]   Feygelman, V., Zhang, G., Stevens, C., et al. (2011) Evaluation of a New VMAT QA Device, or the “X” and “O” Array Geometries. Journal of Applied Clinical Medical Physics, 12, 146-168.
https://doi.org/10.1120/jacmp.v12i2.3346

[20]   Nelms, B.E., Chan, M.F., Jarry, G., et al. (2013) Evaluating IMRT and VMAT Dose Accuracy: Practical Examples of Failure to Detect Systematic Errors When Applying a Commonly Used Metric and Action Levels. Medical Physics, 40, 111722.
https://doi.org/10.1118/1.4826166

[21]   Li, G., Zhang, Y., Jiang, X., et al. (2013) Evaluation of the ArcCHECK QA System for IMRT and VMAT Verification. Physica Medica: European Journal of Medical Physics, 29, 295-303.
https://doi.org/10.1016/j.ejmp.2012.04.005

[22]   Chaswal, V., Weldon, M., Gupta, N., et al. (2014) Commissioning and Comprehensive Evaluation of the ArcCHECK Cylindrical Diode Array for VMAT Pretreatment Delivery QA. Journal of Applied Clinical Medical Physics, 15, 212-225.
https://doi.org/10.1120/jacmp.v15i4.4832

[23]   Aristophanous, M., Suh, Y., Chi, P.C., et al. (2016) Initial Clinical Experience with ArcCHECK for IMRT/VMAT QA. Journal of Applied Clinical Medical Physics, 17, 20-33.
https://doi.org/10.1120/jacmp.v17i5.6118

[24]   Lin, M.H., Koren, S., Veltchev, I., et al. (2013) Measurement Comparison and Monte Carlo Analysis for Volumetric-Modulated Arc Therapy (VMAT) Delivery Verification Using the ArcCHECK Dosimetry System. Journal of Applied Clinical Medical Physics, 14, 220-233.
https://doi.org/10.1120/jacmp.v14i2.3929

[25]   Sun Nuclear Corporation (2014) SNC Patient Reference Guide. ArcCHECK Density, Sun Nuclear Corporation, Melbourne, FL, 1-8.

[26]   Ezzell, G.A., Burmeister, J.W., Dogan, N., et al. (2009) IMRT Commissioning: Multiple Institution Planning and Dosimetry Comparisons, a Report from AAPM Task Group 119. Medical Physics, 36, 5359-5373.
https://doi.org/10.1118/1.3238104

[27]   Eaton, D.J., Tyler, J., Backshall, A., et al. (2017) An External Dosimetry Audit Programme to Credential Static and Rotational IMRT Delivery for Clinical Trials Quality Assurance. Physica Medica: European Journal of Medical Physics, 35, 25-30.
https://doi.org/10.1016/j.ejmp.2017.02.012

[28]   Low, D.A., Harms, W.B., Mutic, S., et al. (1998) A Technique for the Quantitative Evaluation of Dose Distributions. Medical Physics, 25, 656-661.
https://doi.org/10.1118/1.598248

 
 
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