SU-E-T-458: Instability of Electronic Portal Imaging Device Responses for Intensity Modulated Irradiation

2011 ◽  
Vol 38 (6Part17) ◽  
pp. 3594-3594 ◽  
Author(s):  
I Yeo ◽  
J Jung ◽  
B Yi ◽  
F Piskulich ◽  
D Choi ◽  
...  
Keyword(s):  
Electronic Portal Imaging Device ◽  
Imaging Device ◽  
Portal Imaging ◽  
Intensity Modulated ◽  
Electronic Portal Imaging

Dosimetric verification of intensity modulated beams produced with dynamic multileaf collimation using an electronic portal imaging device

1999 ◽  
Vol 26 (11) ◽  
pp. 2373-2378 ◽  
Author(s):  
Kasper L. Pasma ◽  
Maarten L. P. Dirkx ◽  
Marco Kroonwijk ◽  
Andries G. Visser ◽  
Ben J. M. Heijmen
Keyword(s):  
Electronic Portal Imaging Device ◽  
Imaging Device ◽  
Portal Imaging ◽  
Intensity Modulated ◽  
Electronic Portal Imaging ◽  
Multileaf Collimation ◽  
Dosimetric Verification

scholarly journals Verifikasi Luas Lapangan Radiasi penyinaran Linac Tipe Clinac CX Terintegrasi Electronic Portal Imaging Device (EPID) Menggunakan Teknik IMRT Di RSP Universitas Andalas

2018 ◽  
Vol 7 (4) ◽  
pp. 334-338
Author(s):  
Bagus Sidik Waskito Hadi ◽  
Dian Milvita
Keyword(s):  
Radiation Therapy ◽  
Intensity Modulated Radiation Therapy ◽  
Electronic Portal Imaging Device ◽  
Imaging Device ◽  
Portal Imaging ◽  
Intensity Modulated ◽  
Electronic Portal Imaging

Telah dilakukan penelitian untuk memverifikasi luas lapangan radiasi penyinaran pesawat Linac tipe Clinac CX terintegrasi EPID dengan teknik IMRT. Verifikasi ini bertujuan untuk mengetahui kondisi pesawat Linac yang dimiliki oleh RSP Universitas Andalas. Pesawat Linac adalah alat terapi radiasi eksternal yang digunakan untuk mengobati penyakit kanker. Electronic Portal Imaging Device (EPID) adalah perangkat tambahan yang terintegrasikan pada perangkat Linac dan digunakan untuk  verifikasi dosis radiasi penyinaran. Intensity Modulated Radiation Therapy (IMRT) merupakan teknik radioterapi yang menggunakan banyak lapangan radiasi dalam penyinarannya.  Penelitian menggunakan Multi Cube sebagai pengganti tubuh pasien.  Variasi luas lapangan yang digunakan pada penelitian ini adalah lapangan  persegi   (5 x 5)  cm2 sampai (29 x 29) cm2 dengan interval 2 cm dan dengan  energi berkas foton 6 MV dan 10 MV.  Hasil verifikasi luas lapangan radiasi penyinaran menunjukkan hubungan yang linear antara MU penyinaran Linac dan Luas lapangan radiasi untuk energi 6 MV dengan nilai R2 sebesar 0,9362 dan energi 10 MV dengan nilai R2 sebesar 0,9213.  Verifikasi luas lapangan menunjukkan semakin besar luas lapangan radiasi, maka semakin besar pula MU penyinaran Linac yang digunakan. Hal ini menunjukkan bahwa Linac tipe Clinac CX milik rumah sakit Universitas Andalas berada dalam kondisi baik dan dapat digunakan untuk mengobati pasien penyakit kanker.Kata kunci: Electronic Portal Imaging Device (EPID),  Intensity Modulated Radiation Therapy (IMRT), Linac,  Multi Cube.

The experience of a developing country using an electronic portal imaging device for the verification of patient positioning and dosimetry in radiotherapy for prostate cancer

2018 ◽  
Vol 17 (3) ◽  
pp. 297-301
Author(s):  
Leila Farhat ◽  
N. Fourati ◽  
W. Mnejja ◽  
J. Daoud
Keyword(s):  
Prostate Cancer ◽  
Dose Distribution ◽  
Planning System ◽  
Electronic Portal Imaging Device ◽  
Additional Dose ◽  
Imaging Device ◽  
Portal Imaging ◽  
Intensity Modulated ◽  
Electronic Portal Imaging ◽  
Set Up

AbstractPurposeThis is a retrospective study to evaluate the efficacy and safety of routine use of electronic portal imaging device (EPID) in intensity-modulated radiation therapy for localised prostate cancer.Materials and methodsData from 20 patients with localised prostate cancer treated by radical radiotherapy using intensity-modulated technique in Habib Bourguiba Hospital were analysed to define the action levels for pretreatment planer dose distribution of 100 treatment fields and the set-up errors of 418 portal imaging. Pretreatment planar dose distribution was measured with the EPID. The additional dose from repeated portal imaging was determined with treatment planning system.ResultsFor all 100 fields, the predicted and the measured planar dose distribution agrees well with mean±standard deviation value for γmax=2·31±0·57, γavg=0·36±0·07 and γ%≤1=98·94%±0·71%, respectively. For the evaluation of set-up errors, the mean total errors with 1 SD in the lateral, longitudinal and vertical directions were 0·11±0·44 cm; 0·02±0·37 cm and −0·02±0·21 cm, respectively. The imaging additional dose was evaluated as 1 cGy per monitor unit.ConclusionEPID is a useful tool to verify pretreatment dose distribution and to assess the correct field position without a significant increase in the absorbed dose due to the repetition of portal imaging.

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