Set-up verification and 2-dimensional electronic portal imaging device dosimetry during breath hold compared with free breathing in breast cancer radiation therapy

2015 ◽  
Vol 5 (3) ◽  
pp. e135-e141 ◽  
Author(s):  
Patricia J.A.M. Brouwers ◽  
Tim Lustberg ◽  
Jacques H. Borger ◽  
Angela A.W. van Baardwijk ◽  
Jos J. Jager ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Radiation Therapy ◽  
Free Breathing ◽  
Breath Hold ◽  
Electronic Portal Imaging Device ◽  
Imaging Device ◽  
Portal Imaging ◽  
Electronic Portal Imaging ◽  
Set Up

Evaluation of set-up errors and determination of set-up margin in pelvic radiotherapy by electronic portal imaging device (EPID)

2019 ◽  
Vol 19 (2) ◽  
pp. 150-156
Author(s):  
Vajiheh Vejdani Noghreiyan ◽  
Shahrookh Nasseri ◽  
Kazem Anvari ◽  
Maryam Naji ◽  
Mehdi Momennezhad
Keyword(s):  
Cancer Patients ◽  
Target Volume ◽  
Electronic Portal Imaging Device ◽  
Pelvic Radiotherapy ◽  
Imaging Device ◽  
Portal Imaging ◽  
Electronic Portal Imaging ◽  
Pelvic Cancer ◽  
Portal Images ◽  
Set Up

AbstractIntroduction and purpose:The error in set-up of patients is an inherent part of treatment processes. The positioning errors can be used to determine the margins of the planning target volume (PTV) to cover the target volume, while minimising the radiation dose delivered to normal tissues. This study aimed to evaluate random and systematic errors occurring in inter-fraction set-ups of pelvic radiotherapy measured by electronic portal imaging device (EPID) and then to propose the optimum clinical target volume (CTV) to PTV margin in pelvic cancer patients.Materials and methods:This study examined 22 patients treated with pelvic radiotherapy. A total of 182 portal images were evaluated. Population random (σ) and systematic (Σ) errors were determined based on the portal images in three directions (X, Y and Z). The set-up margin for CTV to PTV was calculated by published margin formulae of International Commission on Radiation Units and measurements (ICRU) report No. 62 recommendation and formulas presented by Stroom and Heijmen and Van Herk et al.Results:Systematic set-up errors for radiotherapy to patients ranged between 2·36 and 4·99 mm, and random errors ranged between 1·51 and 2·74 mm. The margin required to cover the target volume retrospectively was calculated based on ICRU 62 and formulas presented by Stroom and Heijmen and Van Herk et al. were used to calculate the range 2·8–5·7 mm, 5·7–11·9 mm and 6·9–14·4 mm, respectively.Conclusion:According to our findings, it can be concluded that by extending the CTV margin by 6·9–14·4 mm, we can ensure that 90% of the pelvic cancer patients will receive ≥ 95% of the prescribed dose in the CTV area.

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.

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