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"ABSTRAKPerkembangan CT scan generasi multislice yang begitu pesat membuat pemeriksaan CT angiografi coroner sering dilaksanakan, akan tetapi pemberian informasi tentang dosis yang di terima pasien masih jarang dilakukan. Sehingga perlu dilakukan estimasi dosis pasien pada pemeriksaan CT angiografi coroner untuk mengetahui nilai dosis yang diterima oleh organ-organ yang sensitive terhadap radiasi seperti esophagus, paru-paru, payudara (pada wanita) dan jantung. Estimasi dosis dilakukan menggunakan program imPACT® dengan nilai nCTDIw didapat dari hasil pengukuran mengunakan detector pencil ion chamber menggunakan phantom acrilic 32 cm. Dari hasil estimasi di dapat dosis ekivalen yang diterima jantung 110 mSv ? 140 mSv, dosis efektif esophagus (thymus) 2,9 mSv ? 5.7 mSv, dosis efektif paru-paru 10 mSv -14 mSv, dosis efektif payudara 10 mSv ? 13 mSv dan total dosis efektif berkisar antara 31 mSv ? 42 mSv. Mengingat nilai total dosis efektif yang diterima pasien cukup tinggi, maka pasien CT angiografi coroner harus mendapatkan justifikasi yang kuat.

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ABSTRACTThe Fast development of CT generation makes CT angiography coroner examination more frequence to be done, but the dose information of patient is rarely to be done. So it require to make patient dose estimation on CT angiography coroner examination. In order to know the dose receive by sensitive organ set of oesophagus, lung, brest and heart. Dose estimation is done using imPACT® program, using CTDI value obtain measurement using acrylic phantom with 32 cm diameter. From dose calculation the dose equivalent by heart is between 110 mSv - 140 mSv, and effective dose for oesophagus 2.9 mSv ? 5.7 mSv, lung 10 mSv ? 14 mSv and total effective dose between 31 mSv ? 42 mSv. Because effective dose receive by patient is very high, the CT angiography coroner patient must have a very strong justification. "

"[Studi ini telah dilakukan untuk mengetahui karakteristik dari EPID dosimetri yang digunakan sebagai verifikasi pasien IMRT dan VMAT. Penelitian ini dilakukan dengan membandingkan indeks gamma dari hasil verifikasi 5 pasien brain, 5 pasien cervix, 5 pasien kepala dan leher serta 5 pasien paru menggunakan EPID dosimetri dengan MatriXX 2D array pada dua Linac yang berbeda di instalasi radioterapi MRCCC SHS dan Siloam Hospital TBS. Dari penelitian ini dihasilkan nilai indeks gamma untuk kasus IMRT di MRCCC 99.59% ± 0.46 untuk EPID dosimetri dan 99.13% ± 0.75 untuk MatriXX 2D array, sedangkan di Siloam Hospital TBS 99.8% ± 0.20 untuk EPID dosimetri dan 99.71% ± 0.14 untuk MatriXX 2D array. Pada kasus VMAT di MRCCC 97.71% ± 1.27 untuk EPID dosimetri dan 99.50% ± 0.39 untuk MatriXX 2D array, sedangkan di SiloamHospital TBS 97.78% ± 1.45 untuk EPID dosimetri dan 98.66% ± 1.26 untuk MatriXX 2D array. Kesimpulan dari penelitian ini adalah perbedaan antara EPID dosimetri dan MatriXX 2D array di kedua rumah sakit menunjukan nilai kurang dari 1% untuk kasus IMRT dan kurang dari 2% untuk kasus VMAT.

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This work was aimed to study the characteristics of EPID dosimetry in use as patient specific QA for IMRT and VMAT. We compare result of gamma index from patient specific QA with each 5 cases of brain, cervix, head and neck, lung

using EPID dosimetry and MatriXX 2D array in two different linacs at MRCCC SHS and Siloam Hospital TBS. Calculated gamma index from IMRT case in MRCCC SHS ware 99.59% ± 0.46 for EPID dosimetry and 99.13% ± 0.75 for MatriXX 2D array, meanwhile at Siloam Hospital TBS the calculated gamma index were 99.8% ± 0.20 for EPID dosimetry and 99.71% ± 0.14 for MatriXX 2D array.Gamma index from VMAT cases in MRCCC were 97.71% ± 1.27 for EPID dosimetry and 99.50% ± 0.39 for MatriXX 2D array, and in Siloam Hospital TBS the value were 97.78% ± 1.45 for EPID dosimetry and 98.66% ± 1.26 for MatriXX 2D array. We conclude that the difference between EPID dosimetry and Matrixx 2D arrays at two hospitals were less than 1% and less than 2% for IMRT and VMAT cases, respectively. This work was aimed to study the characteristics of EPID dosimetry in use as patient specific QA for IMRT and VMAT. We compare result of gamma index from patient specific QA with each 5 cases of brain, cervix, head and neck, lung using EPID dosimetry and MatriXX 2D array in two different linacs at MRCCC SHS and Siloam Hospital TBS. Calculated gamma index from IMRT case in MRCCC SHS ware 99.59% ± 0.46 for EPID dosimetry and 99.13% ± 0.75 for

MatriXX 2D array, meanwhile at Siloam Hospital TBS the calculated gamma index were 99.8% ± 0.20 for EPID dosimetry and 99.71% ± 0.14 for MatriXX 2D array.Gamma index from VMAT cases in MRCCC were 97.71% ± 1.27 for EPID dosimetry and 99.50% ± 0.39 for MatriXX 2D array, and in Siloam Hospital TBS the value were 97.78% ± 1.45 for EPID dosimetry and 98.66% ± 1.26 for MatriXX 2D array. We conclude that the difference between EPID dosimetry and Matrixx 2D arrays at two hospitals were less than 1% and less than 2% for IMRT and VMAT cases, respectively.;This work was aimed to study the characteristics of EPID dosimetry in use as

patient specific QA for IMRT and VMAT. We compare result of gamma index

from patient specific QA with each 5 cases of brain, cervix, head and neck, lung

using EPID dosimetry and MatriXX 2D array in two different linacs at MRCCC

SHS and Siloam Hospital TBS. Calculated gamma index from IMRT case in

MRCCC SHS ware 99.59% ± 0.46 for EPID dosimetry and 99.13% ± 0.75 for

MatriXX 2D array, meanwhile at Siloam Hospital TBS the calculated gamma

index were 99.8% ± 0.20 for EPID dosimetry and 99.71% ± 0.14 for MatriXX 2D

array.Gamma index from VMAT cases in MRCCC were 97.71% ± 1.27 for EPID

dosimetry and 99.50% ± 0.39 for MatriXX 2D array, and in Siloam Hospital TBS

the value were 97.78% ± 1.45 for EPID dosimetry and 98.66% ± 1.26 forMatriXX

2D array. We conclude that the difference between EPID dosimetry and Matrixx

2D arrays at two hospitals were less than 1% and less than 2% for IMRT and

VMAT cases, respectively., This work was aimed to study the characteristics of EPID dosimetry in use as

patient specific QA for IMRT and VMAT. We compare result of gamma index

from patient specific QA with each 5 cases of brain, cervix, head and neck, lung

using EPID dosimetry and MatriXX 2D array in two different linacs at MRCCC

SHS and Siloam Hospital TBS. Calculated gamma index from IMRT case in

MRCCC SHS ware 99.59% ± 0.46 for EPID dosimetry and 99.13% ± 0.75 for

MatriXX 2D array, meanwhile at Siloam Hospital TBS the calculated gamma

index were 99.8% ± 0.20 for EPID dosimetry and 99.71% ± 0.14 for MatriXX 2D

array.Gamma index from VMAT cases in MRCCC were 97.71% ± 1.27 for EPID

dosimetry and 99.50% ± 0.39 for MatriXX 2D array, and in Siloam Hospital TBS

the value were 97.78% ± 1.45 for EPID dosimetry and 98.66% ± 1.26 forMatriXX

2D array. We conclude that the difference between EPID dosimetry and Matrixx

2D arrays at two hospitals were less than 1% and less than 2% for IMRT and

VMAT cases, respectively.]"