Influence dosimetric study of different couches in radiotherapy treatments
DOI:
https://doi.org/10.15392/2319-0612.2022.2018Palabras clave:
radiotherapy, attenuation, BrainLAB, Exact, iBEAMResumen
Radiotherapy is a recommended procedure, in average, for 52% of cancer cases as one of the treatment forms, therefore, it is important for the clinical practice to investigate the affecting factors in dose distribution received by the patients, and for example, devices and treatment couch. With the introduction of treatments with modulated intensity techniques like IMRT and VMAT, the number of incidence fields used for patient treatment increased, which makes the couch’s dosimetric effect more significant in these modalities. The attenuation data acquisition referring to the treatment couches, as well as the TPS data evaluation, show as important parameters for the clinical practice because they show what happens with the dose delivery during the treatment, ensuring a better quality and safety to the treatments. This research presents experimental results evaluating the couch’s impact in the treatments by a study of perturbation in the distribution of surface dose, dose attenuation according to the gantry’s angle for the couches BrainLABTM, ExactTM and iBEAMTM. Then we propose better density values for the couches BrainLABTM and ExactTM for their inclusion in EclipseTM TPS. Lastly, we compare the dose difference considering the presence or not of couch in the planning. In conclusion, the beam’s attenuation increase by the couches and the doses alterations on the skin must be taken in consideration in the treatment planning process. It is of great relevance that each treatment center perform internal tests to determinate the best density values for available TPS.
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WHO. Cancer. Available at: <https://www.who.int/en/news-room/fact-sheets/detail/cancer> Last accessed: 11 Sep. 2021.
G. DELANEY, S. JACOB, C. FEATHERSTONE, AND M. BARTON. The role of radio-therapy in cancer treatment. Cancer, vol. 104, no. 6, pp. 1129–1137, Sep. 2005, doi: 10.1002/cncr.21324.
T. P. HANNA, J. SHAFIQ, G. P. DELANEY, S. K. VINOD, S. R. THOMPSON, AND M. B. BARTON. The population benefit of evidence-based radiotherapy: 5-Year local control and overall survival benefits. Radiotherapy and Oncology, vol. 126, no. 2, pp. 191–197, Feb. 2018, doi: 10.1016/j.radonc.2017.11.004.
A. J. OLCH, L. GERIG, H. LI, I. MIHAYLOV, AND A. MORGAN. Dosimetric effects caused by couch tops and immobilization devices: Report of AAPM Task Group 176. Medi-cal Physics, vol. 41, no. 6Part1, p. 061501, May 2014, doi: 10.1118/1.4876299.
L. G. DE MOOY. The use of carbon fibres in radiotherapy. Radiotherapy and Oncology, vol. 22, no. 2, pp. 140–142, Oct. 1991, doi: 10.1016/0167-8140(91)90010-E.
H. A. HUGHES. Measurements of Superficial Absorbed Dose with 2 MV X Rays Used at Glancing Angles. The British Journal of Radiology, vol. 32, no. 376, pp. 255–258, Apr. 1959, doi: 10.1259/0007-1285-32-376-255.
C. F. NJEH, T. W. RAINES, AND M. W. SAUNDERS. Determination of the photon beam attenuation by the BrainLAB imaging couch: angular and field size dependence. Journal of Applied Clinical Medical Physics, vol. 10, no. 3, pp. 16–27, Jun. 2009, doi: 10.1120/jacmp.v10i3.2979.
VARIAN. Specifications Exact IGRT Couch Precise Imaging, vol. 1. United States, 2008.
ELEKTA. iBEAM evo Couchtop User Manual , vol. 1. Schwabmünchen, Germany, 2017.
ANDREO P, BURNS DT, HOHLFELD K, HUQ MS, KANAI T, LAITANO F, et al. Ab-sorbed Dose Determination in External Beam Radiotherapy: An International Code of Practice for Dosimetry based on Standards of Absorbed Dose to Water, vol. 12. Vienna, Austria: INTERNATIONAL ATOMIC ENERGY AGENCY, 2006.
S. WELLHÖFER. User’s Guide to the SP34 QA Phantom, vol. 1. Schwarzenbruck, Ger-many, 2003.
C. F. NJEH, J. PARKER, J. SPURGIN, AND E. RHOE. A validation of carbon fiber ima-ging couch top modeling in two radiation therapy treatment planning systems: Philips Pin-nacle3 and BrainLAB iPlan RT Dose. Radiation Oncology, vol. 7, no. 1, p. 190, Dec. 2012, doi: 10.1186/1748-717X-7-190.
A. R. SERANTE, J. G. GONCALVES, W. F. P. NEVES-JUNIOR, J. P. S. LEITE, AND C. M. K. HADDAD. Attenuation measures of the BrainLAB imaging couch and validation on the treatment planning system Eclipse. Revista Brasileira de Fisica Medica, vol. 9, no. 3, pp. 28–33, 2015.
I. B. MIHAYLOV, P. CORRY, Y. YAN, V. RATANATHARATHORN, AND E. G. MO-ROS. Modeling of carbon fiber couch attenuation properties with a commercial treatment planning system. Medical Physics, vol. 35, no. 11, pp. 4982–4988, Oct. 2008, doi: 10.1118/1.2982135.
J. K. H. SEPPÄLÄ AND J. A. J. KULMALA. Increased beam attenuation and surface dose by different couch inserts of treatment tables used in megavoltage radiotherapy. Journal of Applied Clinical Medical Physics, vol. 12, no. 4, pp. 15–23, Sep. 2011, doi: 10.1120/jacmp.v12i4.3554.
T. H. KIM, S. A. OH, J. W. YEA, J. W. PARK, AND S. K. KIM. The Dose Attenuation according to the Gantry Angle and the Photon Energy Using the Standard Exact Couch and the 6D Robotic Couch. Progress in Medical Physics, vol. 27, no. 2, p. 79, 2016, doi: 10.14316/pmp.2016.27.2.79.
D. W. SMITH, D. CHRISTOPHIDES, C. DEAN, M. NAISBIT, J. MASON, AND A. MORGAN. Dosimetric characterization of the iBEAM evo carbon fiber couch for radiothe-rapy. Medical Physics, vol. 37, no. 7Part1, pp. 3595–3606, Jun. 2010, doi: 10.1118/1.3451114.
R. ZHANG, Y. GAO, AND W. BAI. Quantification and comparison the dosimetric impact of two treatment couch model in VMAT. Journal of Applied Clinical Medical Physics, vol. 19, no. 1, pp. 10–16, Jan. 2018, doi: 10.1002/acm2.12206.
D. WAGNER AND H. VORWERK. Treatment Couch Modeling in the Treatment Planning System Eclipse. Journal of Cancer Science & Therapy, vol. 03, no. 01, 2010, doi: 10.4172/1948-5956.1000049.
K. B. PULLIAM, R. M. HOWELL, D. FOLLOWILL, D. LUO, R. A. WHITE, AND S. F. KRY. The clinical impact of the couch top and rails on IMRT and arc therapy. Physics in Medicine and Biology, vol. 56, no. 23, pp. 7435–7447, Dec. 2011, doi: 10.1088/0031-9155/56/23/007.
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Derechos de autor 2022 Brazilian Journal of Radiation Sciences (BJRS)
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