[ABSTRAK
Tujuan dari penelitian ini adalah mengevaluasi akurasi perencanaan danpemberian perlakuan volumetric modulated arc therapy (VMAT) menggunakanrekomendasi AAPM Task Group (TG) 119 di Departemen Radioterapi MRCCCSiloam Hospitals Semanggi. TG 119 menetapkan dua tes pendahuluan dan limates menyerupai kondisi klinis, serta confidence limit (CL) sebagai nilai standarpengujian. Perencanaan intensity modulated radiation therapy (IMRT) danVMAT dibuat lokal mengikuti preskripsi dosis dan sasaran perencanaan yangditetapkan oleh TG 119, kemudian hasil perencanaan lokal dibandingkan denganhasil TG 119. Pengukuran dosis titik dari pemberian perlakuan IMRT dan VMATpada daerah dosis tinggi dan rendah diukur menggunakan tiga bilik ionisasidengan volume aktif yang berbeda, sedangkan pengukuran dosis penampangmenggunakan detektor 2D array, distribusi dosis penampang dianalisa dengankriteria indeks gamma 3 %, 3 mm dan 2 %, 2 mm. CL hasil pengukuran dosis titikIMRT pada daerah dosis tinggi dan rendah 1.06 % dan 0.82 % (CC01), 1.19 %dan 1.58 % (CC13), 1.37 % dan 3.02 % (FC65G). Untuk VMAT 1.47 % dan 1.17% (CC01), 1.71 % dan 1.95 % (CC13), 2.08 % dan 3.96 % (FC65G). Hasilpengukuran menggunakan bilik ionisasi CC01 dan CC13 mampu memenuhikriteria yang ditetapkan TG 119 dibawah 3 %, sedangkan bilik ioisasi FC65Gtidak memenuhi kriteria tersebut. Hasil CL analisa indeks gamma IMRT dengankriteria gamma 3 %, 3 mm dan 2 %, 2mm sebesar 3.68 dan 11.71 (96.32 % dan88.29 % pass), sedangkan untuk VMAT sebesar 1.44 dan 6.33 (98.56 % dan93.67 % pass), kedua hasil indeks gamma tersebut masuk dalam kriteria TG 119dibawah 12.4. Berdasarkan hasil tersebut, rekomendasi TG 119 dapatdiimplementasikan untuk menguji akurasi perencanaan dan pemberian perlakuanVMAT, hasil tersebut juga menunjukkan keakurasian yang cukup dariperencanaan dan pemberian perlakuan VMAT di institusi lokal.
ABSTRACT
The purpose of this study was to evaluate the accuracy of treatment planning anddelivery of Volumetric Modulated Arc Therapy (VMAT) using recommendationof AAPM Task Group (TG) 119 in the Department of Radiotherapy MRCCCSiloam Hospitals Semanggi. TG 119 establishes two preliminary tests and fivetests resemble a clinical condition, as well as the confidence limit (CL) as abenchmark data. Dose prescriptions and planning objectives recommended by TG119 report were followed to generate Intensity Modulated Radiation Therapy(IMRT) and VMAT treatment planning, and then the local planning resultscompared with the results of TG 119. Point dose measurements were done usingthree ionization chambers with different active volume at high dose and low doseregions. The planar dose measurements were measured using a 2D detector arrayand the planar dose distribution was analyzed for percentage of points passing thegamma criteria of 3 %, 3 mm and 2 %, 2 mm. For IMRT plans, the CLs obtainedfor point dose measurement in areas of high and low doses were 1.06 % and 0.82% (CC01), 1.19 % and 1.58 % (CC13), 1.37 and 3.02 % (FC65G), whereas avalue of 1.47 and 1.17 % (CC01), 1.71 % and 1.95 % (CC13), 2.08 % and 3.96 %(FC65G) for CL VMAT. Point dose measurement results using ion chamberCC01 and CC13 were able to meet the criteria set by TG 119 below 3 %, whilefor ion chamber FC65G could not meet these criteria. From gamma analysis, CLIMRT for gamma criteria 3 %, 3 mm and 2 %, 2 mm were 3.68 and 11.71 (96.32% and 88.29 % pass), while for VMAT were 1.44 and 6.33 (98.56 % and 93.67 %pass), gamma index results falls within the criteria TG 119 under 12.4. Based onthe results, TG 119 recommendations can be implemented on commissioningVMAT treatment planning and delivery, these results also indicate adequateaccuracy of VMAT treatment planning and delivery in local institution, The purpose of this study was to evaluate the accuracy of treatment planning anddelivery of Volumetric Modulated Arc Therapy (VMAT) using recommendationof AAPM Task Group (TG) 119 in the Department of Radiotherapy MRCCCSiloam Hospitals Semanggi. TG 119 establishes two preliminary tests and fivetests resemble a clinical condition, as well as the confidence limit (CL) as abenchmark data. Dose prescriptions and planning objectives recommended by TG119 report were followed to generate Intensity Modulated Radiation Therapy(IMRT) and VMAT treatment planning, and then the local planning resultscompared with the results of TG 119. Point dose measurements were done usingthree ionization chambers with different active volume at high dose and low doseregions. The planar dose measurements were measured using a 2D detector arrayand the planar dose distribution was analyzed for percentage of points passing thegamma criteria of 3 %, 3 mm and 2 %, 2 mm. For IMRT plans, the CLs obtainedfor point dose measurement in areas of high and low doses were 1.06 % and 0.82% (CC01), 1.19 % and 1.58 % (CC13), 1.37 and 3.02 % (FC65G), whereas avalue of 1.47 and 1.17 % (CC01), 1.71 % and 1.95 % (CC13), 2.08 % and 3.96 %(FC65G) for CL VMAT. Point dose measurement results using ion chamberCC01 and CC13 were able to meet the criteria set by TG 119 below 3 %, whilefor ion chamber FC65G could not meet these criteria. From gamma analysis, CLIMRT for gamma criteria 3 %, 3 mm and 2 %, 2 mm were 3.68 and 11.71 (96.32% and 88.29 % pass), while for VMAT were 1.44 and 6.33 (98.56 % and 93.67 %pass), gamma index results falls within the criteria TG 119 under 12.4. Based onthe results, TG 119 recommendations can be implemented on commissioningVMAT treatment planning and delivery, these results also indicate adequateaccuracy of VMAT treatment planning and delivery in local institution] |
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