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All Journal Physics Student Journal Indonesian Physical Review
Fatimah Kunti Hentihu, Fatimah Kunti
Brawijaya University
Education Physics

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Perkiraan Dosis Ekuivalen Neutron Termal pada Pasien Radioterapi Linac 15 MV Hentihu, Fatimah Kunti; Noor, Johan A. E.; -, Bunawas
Physics Student Journal Vol 2, No 1 (2014)
Publisher : Department of Physics - Faculty of Science

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Abstract

Penggunaan linac dengan energi foton lebih dari 10 MV akan menghasilkan neutron dari reaksi fotoneutron antara foton yang dihasilkan dengan bahan-bahan di sekitar kepala linac. Kami telah melakukan penelitian dengan menggunakan pesawat  linac 15 MV untuk mengukur dosis ekuivalen neutron termal di dalam tubuh dengan menggunakan sebuah fantom atropomorfik berbahan polietilen yang disisipi detektor CR-39 beradiator BN-1. Ketika neutron cepat masuk ke dalam fantom dan berinteraksi, neutron cepat akan mengalami moderasi dan termalisasi menjadi neutron termal. Neutron termal tersebut dideteksi dengan detektor CR-39 beradiator BN-1 karena reaksi antara neutron termal dengan boron menghasilkan partikel alfa yang akan berinteraksi dengan detektor CR-39 dan menghasilkan jejak. Sebelum digunakan, detektor dikalibrasi terlebih dahulu dengan sumber neutron 252Cf  untuk memperoleh persamaan kalibrasi    y = 164x. Sensitivitas detektor CR-39 pada penelitian ini sebesar 164 jejak/cm2.µSv. Dosis ekuivalen neutron termal dari penyinaran linac dengan dosis terapi 2 Gy dan 3 Gy sebesar 52 - 206 µSv dengan ketidakpastian ±5% dan 78-309 µSv dengan ketidakpastian ±4%. Variasi dosis tersebut berhubungan dengan letak titik (kedalaman dan jarak dari isosenter penyinaran) dan jenis bahan pada fantom.
DOSIMETRIC EVALUATION OF POST-MASTECTOMY THREE-DIMENSIONAL CONFORMAL RADIATION THERAPY (3DCRT) BREAST CANCER TREATMENT PLANS Herwiningsih, Sri; Naba, Agus; Rianto, Sugeng; Hentihu, Fatimah Kunti
Indonesian Physical Review Vol. 6 No. 3 (2023)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v6i3.240

Abstract

Breast cancer is the most diagnosed cancer in women globally. External beam radiotherapy is one method to treat breast cancer, which can be given to the patients after mastectomy. The changes in anatomy of breast tissues after mastectomy makes the radiotherapy treatment very challenging to ensure the prescribed dose delivered to the tumour target while the radiation to the surrounding critical organs is kept to be low. This study aims to evaluate the dosimetric parameters of radiotherapy treatment plans for breast cancer patients after mastectomy delivered using 3DCRT technique. The evaluation includes the target coverage to the PTV, defined as the volume of PTV receiving 95% of the prescribed dose and the volume of PTV receiving 107% of the prescribed dose. The min, max and mean dose to the PTV were also recorded. The dosimetric parameters to the OARs were Dmean and V20 to the lung, Dmean and V25 to the heart, Dmean to esophagus and Dmax to the spinal cord. The result shows that target coverage is fulfilled in most of the plans, however the host spot in the PTV also observed in the most of the plans. Dose to heart, left lung, esophagus and spinal cord are relatively low and below the constraint recommended by QUANTEC, however the V20 to the right lung exceeded the constraint in the most of the plans. The combination of photon and electron beam might be useful to reduce the excessive dose to the right lung.
Co-Authors Agus Naba Bunawas - Johan A. E. Noor Sri Herwiningsih Sugeng Rianto