Kurniadiyah Nuril Izza, Luthfi Rusyadi, Jeffri Ardiyanto


Background: Verification of geometry is a process to ensure that the position and volume of the irradiated tumor is the same as planned.Verification is done by comparing the radiographic image information of the Treatment Planning System (TPS) with radiation therapy to be provided on the Electronic Portal Imaging Device (EPID) device. This research is about geometry verification process on 3D conformal radiotherapy technique with nasopharyngeal cancer case at Radiotherapy Unit Radiology Installation Dr.Sardjito Hospital Yogyakarta which aims to know the procedure and shift of geometry verification.

Methods: The type of this research is descriptive study with retrospective data. Methods of data collection used are observation, interview and documentation. The subjects consisted of 3 radiotherapists, 1 medical physician and 1 radiation oncologist. The object of the study was nasopharyngeal cancer patients who received radiotherapy with conformal 3D technique with a sample size of 10 patients. Data obtained from observations and interviews were collected and then data reduction and open coding were then presented in the form of quotations, and drawn conclusions and suggestions.

Result: The results of this study indicate that the geometry verification procedure is performed on the irradiation fractions 1,2 and 3 then in the 4th fraction we take the average shift of the fractions 1,2 and 3 to obtain the new isocenter point. After obtaining the new isocenter point of verification, do it again when the fractional radiation to 10 and 20. The average variation of the geometry shift obtained is on the vertical axis of 0.46 cm (towards the posterior), on the longitudinal axis of -0.2 cm (towards the superior) and on the lateral axis of -0.2 cm (towards the left) from the isocenter point.

Conclusion: know the procedure of geometry verification conducted in Radiotherapy Unit of Dr. Sardjito Yogyakarta and got the average of shifting variation on each vertical, longitudinal and lateral axis.


Nasopharyngeal Cancer;3DCRT;Geometry Verification;EPID

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Abramson Cancer Center of the University of Pennsylvania. 2014. Pictorial Overview of the Radiation Therapy Treatment Process.

Adam Faisal. 2013. Verifikasi Geometri Radioterapi Teknik 3DCRT/IMRT Pada Kasus Kanker Kepala dan Leher di Departemen Radioterapi RSCM.

Adham M., Kurniawan AN., Muhtadi AI, dkk. 2012. Nasopharyngeal Carcinoma in Indonesia: Epidemiology, Incidence, Signs, and Symptoms at Presentation. Chin J Cancer.

Ball John. 2000. Chesney Radiographic Imaging. Cambridge: The University Press.

Beyzadeoglu, Murat., O. Gokhan, dan E. Cuneyt. 2010. Basic Radiation Oncology. Verlag Berlin Helderberg: Springer.

Globocan. 2012. Estimated Cancer Incidence, Mortality and Prevalence Worldwide.

Goyal S, Kataria T. 2014. Image Guidance in Radiation Therapy: Techniques and Applications. Radiology Research and Practice. doi:10.1155/2014/705604

Gupta T, Narayan CA. 2012. Image-guided Radiation Therapy: Physician's Perspectives. J Med Phys.37 (4):174-182.

Herawati, Sri dan Rukmini, Sri. 2003. Ilmu Penyakit Telinga Hidung Tenggorokan. Jakarta: EGC.

Hoskin P., Gaze M., Greener T, dkk. 2007. On Target Ensuring Geometric Accuracy in Radiotherapy : Principles of Geometric Verification. Royal College of Radiologists.

James D.Cox dan K. Kian Ang. 2010. Radiation Oncology 9th edition. Philadelphia: Mosby Elsevier.

Mileusnic D. 2005. Verification and Correction of Geometrical Uncertainties in Conformal Radiotherapy. Arch Oncol: 13 (3-4):140-4.

Perez, dkk. 2008. Principles and Practice of Radiation Oncology 5th edition. LWW.

Siebers JV., Keall PJ., Wu Q., Williamson JF., Schmidt-Ullrich RK. 2005. Effect of Patient Setup Errors on Simultaneously Integrated Boost Head and Neck IMRT Treatment Plan. Int J Radiat Oncol Biol Phys; 63: 422-433.

Stroom JC dan Heijmen BJM. 2002. Geometrical Uncertainties, Radiotherapy Planning Margins, and The ICRU-62 Report. Radiotherapy Oncol 64: 75-83.

User manual. 2016. Electronic Portal Imaging Device IViewGT.

Van Herk M. 2004. Errors and margins in radiotherapy. Semin Radiat Oncol. 14: 52-64.

Zumsteg Z., DeMarco J., Lee SP, dkk. 2012. Image guidance during head-and-neck cancer radiation therapy: analysis of alignment trends with in-room conebeam computed tomography scans. Int J Radiat Oncol Biol Phys; 83: 712-719.


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