Effect of the Patient Table on the Absorbed Dose of the Co-60 Machine at the Radiotherapy Installation Sanglah Hospital
Abstract
A study has been conducted to determine the effect of patient table on the absorbed dose on the Co-60 NPIC-GWXJ80 machine at the Radiotherapy Installation Sanglah Hospital, Denpasar. Measurement of radiation dose is one part of the Quality Control (QC) radiotherapy machine. Measurements were carried out according to the TRS 398 IAEA protocol, using a phantom slab with a thickness 10 cm, dose 200 cGy, Source to Surface Distance (SSD) 80 cm with irradiation angles of 00 (anteroposterior position/AP) and 1800 (posteroanterior position/PA). The calculation of the absorbed radiation dose was carried out using Microsoft Excel worksheet TRS 398. The measurement results showed that the absorbed dose with the installation of the patient table was smaller than without the installation of the patient table. The deviation of the absorbed dose in the measurement of AP, PA without a table and PA with a table, respectively, is 1.24%, 1.48% and 5.04%. The deviation of the absorbed dose in the PA measurement with the table exceeds the tolerance limit set by the IAEA, which is ±5%, so it is necessary to calculate the correction factor for the patient table. The value of the patient table correction factor was 0.97 with the corrected irradiation time is1.56 minutes. The deviation of the absorbed dose based on the results of measurements and calculations using a corrected irradiation time is 2.35%, so that the output of the Co-60 machine is in accordance with the IAEA TRS 398 standard and is suitable for use.
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References
[2] G. N. Sutapa, I W. Supartha, I N. Wijaya, I K. Puja dan M. Syaifudin, The effectiveness of 60Co gamma-ray exposure to the reproductive systems of rat (Rattus argentiventer) as sterile male technique, Biodiversitas, vol 21, no. 8, 2020, pp. 3805-3810.
[3] N. Fitriatuzzakiyyah, R. K. Sinuraya dan I. M. Puspitasari, Terapi Kanker dengan Radiasi: Konsep Dasar Radioterapi dan Perkembangannya di Indonesia, Jurnal Farmasi Klinik Indonesia, vol.6, no. 4, 2017, pp. 311-320.
[4] Dita, S. Iramanda dan M. A. Aristianingrum, Quality Assurance (Qa) Dan Quality Control (Qc) Cobalt, Jurnal Biosains Pascasarjana, vol. 23, 2021, pp. 61-74.
[5] N. Abuhadi and A. B. A. Hassan, Assessment of Radiotherapy Treatment Field on Portal Film Using Image Processing, Open Journal of Biophysics, vol. 9, no. 4, 2019, pp. 267-275.
[6] G. N. Sutapa, I W. Supartha, I N. Wijaya dan I K. Puja, Effect of Radiation Gamma Co-60 on Sterile Male Technique Competitiveness in Inhibiting Population of Rattus argentiventer, Journal of Advanced Research in Dynamical and Control Systems, vol. 11, no. 06-Special Issue, 2019, pp. 1873-1879.
[7] H. Setyono, Darmini, Khumaidi dan A. N. Kurniawan, Tatalaksana Radioterapi Eksterna Kanker Tiroid dengan Mass Malignant Thyroid di Instalasi Radioterapi Rumah Sakit Umum Daerah dr. Moewardi Surakarta, Jurnal Imejing Diagnostik, vol. 4, no. 1, 2018, pp. 53-55.
[8] M. Handayani, D. Milvita, S. Herlinda, dan K. Y. P. Sandy, Verifikasi Ketepatan Hasil Perencanaan Nilai Dosis Radiasi terhadap Penerimaan Dosis Radiasi pada Pasien Kanker, Jurnal Fisika Unand, vol. 5, no. 2, 2016, pp.159-165.
[9] International Atomic Energy Agency, Technical Report Series No.398 Absorbed Dose Determination In External Beam Radiotherapy: An International Code Of Practice For Dosimetry Based On Standards Of Absorbed Dose to Water, Vienna, 2006.
[10] A. Handoko, Hidayatullah, E. Hidayanto dan V. Richardina, Analisis Keakuratan Verifikasi Dosis dengan Menggunakan Perbandingan Phantom Standar dan Phantom Replica, Youngster Physics Journal, vol. 7, no 1, 2018, pp. 1-10.
[11] National Cancer Institute, External Beam Radiation Therapy for Cancer, 2018, Available from: https://www.cancer.gov/about-cancer/treatment/types/radiation-therapy/external-beam. [Cited 2022 January 10].
[12] R. Prahardi, G. Winamo, A. Tarigan dan E. Marliani, Penatalaksanaan Radiasi Eksterna Kasus Kanker Nasofaring Teknik 2D Menggunakan Pesawat Cobalt 60, Jurnal Radiografer Indonesia, vol. 2, no. 1, 2019, pp. 1-4.
[13] Elaine M. Zeman, Eric C. Schreiber, and Joel E. Tepper, Basics of Radiation Therapy, 2013, Available from: https://d2ogjlfjkptkow.cloudfront.net/putextbook/19698.pdf. [Cited 2022 January 10].
[14] BAPETEN, Peraturan Kepala Badan Pengawas Tenaga Nuklir Nomor 3 Tahun 2013 Tentang Keselamatan Radiasi dalam Penggunaan Radioterapi, Jakarta, 2013.
[15] M. Akhadi, Dasar-Dasar Proteksi Radiasi, Jakarta, 2001.
[16] Supriyanto, Penentuan Hubungan antara Waktu Penyinaran Radioterapi dengan Laju Dosis Radionuklida Co-60, Skripsi, Jurusan Fisika, Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Diponegoro, 2001.
[17] L. Yuniarsari, K. Kristiyani, B. Rozali, dan B. Syawaludin, Perancangan Perisai Radiasi pada Kepala Sumber untuk Pesawat Radioterapi Eksternal Menggunakan Co-60 pada Posisi Beam Off, Jurnal Perangkat Nuklir, vol. 7, no. 1, 2013, pp. 32-40.
[18] Z. suhartono, Dosimetri Radioterapi, Jakarta, 1990.
