DOSIMETRIC EVALUATION OF FABRICATED RHIZOPHORA SPP. PARTICLEBOARD PHANTOMS AT HIGH ENERGY PHOTONS, ELECTRONS AND BRACHYTHERAPY USING TREATMENT PLANNING SYSTEM (TPS) SOFTWARE

Abstract

ABSTRACT

Particleboards made of Rhizophora spp. were fabricated with target density of 1.0g/cm³ and dimension of 30 cm 30 cm based on the commonly used solid water phantoms. The particleboards were scanned and acquired by the treatment planning system (TPS) software regularly used in radiotherapy and brachytherapy. The CT numbers of the particleboards were determined and the percentage depth dose (PDD) of the particleboards was determined at 6 and 10 MV photons and 6 and 9 MeV electrons using the TPS simulation. The dose profile and depth dose of brachytherapy were also simulated using the TPS based on the ¹⁹²Ir high dose rate (HDR) brachytherapy. The PDD of Rhizophora spp. particleboards showed good agreement to solid water phantoms at all simulated photon and electron energies with percentage of discrepancies within 7.43 and 7.52% respectively. The dose profile and depth dose of the particleboards in brachytherapy simulation showed an excellent agreement within 2% to solid water phantoms. The results had indicated the potential use of Rhizophora spp. particleboards as phantom for radiotherapy and brachytherapy using TPS simulation.

ABSTRAK

Papan partikel difabrikasi daripada Rhizophora spp. dengan ketumpatan 1.0g/cm³ dan dimensi luaran 30 cm 30 cm berdasarkan fantom lazim ‘solid water’. Papan-papan partikel diimbas dengan pengimbas CT dan imejnya dihantar ke perisian ‘treatment planning’ (TPS) untuk radioterapi dan brakiterapi. Nombor CT papan partikel didapatkan dan peratusan dos kedalaman (PDD) dihitung pada foton bertenaga 6 and 10 MV and elektron bertenaga 6 dan 9 MeV menggunakan simulasi TPS. Profil dos dan dos kedalaman bagi brakiterapi juga disimulasi menggunakan TPS berdasarkan brakiterapi HDR bagi ¹⁹²Ir. PDD bagi papan partikel Rhizophora spp. menyerupai fantom ‘solid water’ untuk foton dan elektron dengan peratus perbezaan masing-masing 7.43 dan 7.52%. Dos profil dan dos kedalaman papan partikel juga menyerupai fantom ‘solid water’ dengan peratusan perbezaan sebanyak 2%. Keputusan ujian ini telah menunjukkan potensi papan serpai Rhizophora spp. sebagai bahan fantom bagi radioterapi dan brakiterapi menggunakan simulasi TPS.