Analisis Hasil Pengukuran Tissue Maximum Ratio (TMR) terhadap Variasi Kedalaman Target dan Luas Lapangan Penyinaran Menggunakan Pesawat LINAC Tipe Clinac-CX

Authors

  • Vinny Alvionita Jurusan Fisika FMIPA, Universitas Andalas, Padang
  • Dian Milvita Jurusan Fisika FMIPA, Universitas Andalas, Padang

DOI:

https://doi.org/10.25077/jfu.7.2.97-101.2018

Abstract

Telah dilakukan penelitian untuk mengetahui pengaruh variasi kedalaman target dan luas lapangan penyinaran terhadap penerimaan dosis radiasi pada fantom menggunakan pesawat terapi Linear Accelerator (LINAC) tipe Clinac CX. Penelitian dilakukan dengan variasi kedalaman (0-30) cm dengan interval 1 cm dan 18 variasi luas lapangan penyinaran dimulai dari (5x5) cm2 hingga (39x39) cm2 dengan interval 2 cm. Variasi kedalaman dan luas lapangan dilakukan untuk mendapatkan nilai Tissue Maximum Ratio (TMR). TMR merupakan rasio dosis radiasi di kedalaman tertentu terhadap dosis radiasi di kedalaman maksimum. Pada penelitian ini digunakan berkas energi foton sebesar 6 MV dan 10 MV, dengan teknik penyinaran Source Surface Distance (SSD). Penelitian ini dilakukan di dalam fantom air sebagai pengganti pasien menggunakan detektor ionisasi chamber. Hasil penelitian yang didapatkan menunjukkan bahwa semakin besar kedalaman target maka semakin besar pula nilai TMR yang diterima fantom hingga mencapai kedalaman maksimum (zmaks). Setelah melewati kedalaman maksimum (zmaks) nilai TMR yang didapatkan cenderung menurun. Selanjutnya semakin bertambah luas lapangan penyinaran maka semakin bertambah nilai TMR yang didapatkan. Nilai zmaks yang didapatkan untuk berkas foton berenergi 6 MV berkisar (1,35 – 1,75) cm, dan untuk berkas foton berenergi 10 MV berkisar (2,25-2,55) cm. Nilai zmaks ini berada dalam batas yang ditetapkan oleh Internasional Atomic Energy Agency (IAEA) yaitu 1,5 cm untuk energi 6 MV dan 2,5 cm untuk energi 10 MV.

 

Kata kunci: fantom air, LINAC, Source Surface Distance (SSD), Tissue Maximum Ratio (TMR).

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Published

2018-04-02

How to Cite

Alvionita, V., & Milvita, D. (2018). Analisis Hasil Pengukuran Tissue Maximum Ratio (TMR) terhadap Variasi Kedalaman Target dan Luas Lapangan Penyinaran Menggunakan Pesawat LINAC Tipe Clinac-CX. Jurnal Fisika Unand, 7(2), 97–101. https://doi.org/10.25077/jfu.7.2.97-101.2018

Issue

Vol. 7 No. 2 (2018)

Section

Articles

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Copyright (c) 2018 Vinny Alvionita, Dian Milvita

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