PENENTUAN DOSIS RADIASI LINAC MENGGUNAKAN APLIKASI MCNPX PADA JARINGAN LUNAK DENGAN PENYISIPAN PARU-PARU, PANKREAS DAN TULANG BELAKANG
DOI:
https://doi.org/10.26418/pf.v12i2.77133Abstract
Dalam proses radioterapi, distribusi dosis yang akan diterima pasien perlu diestimasi terlebih dahulu sebelum dilakukan penyinaran agar pemanfaatan terapi radiasi dapat optimal. Perhitungan dosis radiasi tersebut dapat disimulasikan dengan program MCNPX. Dalam penelitian ini, karakteristik kurva Percentage Depth Dose (PDD) dan distribusi dosis serap pada organ pankreas serta tulang belakang dihitung berdasarkan simulasi dengan MCNPX. Phantom yang digunakan adalah jenis ORNL-MIRD phantom (1996 version) yang telah dimodifikasi. Phantom nonhomogen disisip dengan organ paru-paru di kedalaman 5,0-14,0 cm, pankreas, dan tulang belakang. Luas lapangan radiasi 10×10 cm2, arah penyinaran radiasi Anterior-Posterior (AP). Penelitian dilakukan dengan variasi Source Surface Distance (SSD) sebesar 95,0 cm, 97,5 cm, 100 cm, 102,5 cm, dan 105 cm. Hasil penelitian menunjukkan bahwa karakteristik kurva PDD phantom homogen mengalami peningkatan hingga kedalaman 2,0 cm untuk seluruh SSD. Kurva PDD kemudian mengalami penurunan secara eksponensial. Kurva PDD untuk phantom nonhomogen menunjukkan perbedaan pola di daerah sebelum paru-paru, di paru-paru, dan setelah paru-paru. Selanjutnya, distribusi dosis serap terendah untuk organ pankreas dan tulang belakang didapatkan saat menggunakan SSD 105 cm. Manfaat dari temuan ini adalah dapat membantu memaksimalkan kinerja pada proses Treatment Planning System (TPS).References
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Date: 24-05-2023
Prisma Fisika
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