SU-E-T-356: Efficient Segmentation of Flattening Filter Free Photon Beamsfor 3D-Conformal SBRT Treatment Planning

2015 ◽  
Vol 42 (6Part17) ◽  
pp. 3415-3415
Author(s):  
J Barbiere ◽  
G Beninati ◽  
A Ndlovu
Keyword(s):  
Treatment Planning ◽  
Flattening Filter Free ◽  
Flattening Filter

SU-FF-T-70: A Treatment Planning Study of Liver Cancer Treatments with a Flattening Filter Free Linear Accelerator

2006 ◽  
Vol 33 (6Part7) ◽  
pp. 2064-2065 ◽  
Author(s):  
O Vassiliev ◽  
A Beddar ◽  
S Krishnan ◽  
T Briere ◽  
M Gillin ◽  
...  
Keyword(s):  
Liver Cancer ◽  
Treatment Planning ◽  
Linear Accelerator ◽  
Planning Study ◽  
Cancer Treatments ◽  
Flattening Filter Free ◽  
Flattening Filter

Monte Carlo evaluation of target dose coverage in lung stereotactic body radiation therapy with flattening filter-free beams

2020 ◽  
pp. 1-7
Author(s):  
Oleg N. Vassiliev ◽  
Christine B. Peterson ◽  
Joe Y. Chang ◽  
Radhe Mohan
Keyword(s):  
Monte Carlo ◽  
Radiation Therapy ◽  
Treatment Planning ◽  
Stereotactic Body Radiation Therapy ◽  
Target Coverage ◽  
Tumour Control ◽  
Stereotactic Body Radiation ◽  
Lung Sbrt ◽  
Flattening Filter Free ◽  
Flattening Filter

Abstract Aim: Previous studies showed that replacing conventional flattened beams (FF) with flattening filter-free (FFF) beams improves the therapeutic ratio in lung stereotactic body radiation therapy (SBRT), but these findings could have been impacted by dose calculation uncertainties caused by the heterogeneity of the thoracic anatomy and by respiratory motion, which were particularly high for target coverage. In this study, we minimised such uncertainties by calculating doses using high-spatial-resolution Monte Carlo and four-dimensional computed tomography (4DCT) images. We aimed to evaluate more reliably the benefits of using FFF beams for lung SBRT. Materials and methods: For a cohort of 15 patients with early-stage lung cancer that we investigated in a previous treatment planning study, we recalculated dose distributions with Monte Carlo using 4DCT images. This included 15 FF and 15 FFF treatment plans. Results: Compared to Monte Carlo, the treatment planning system (TPS) over-predicted doses in low-dose regions of the planning target volume (PTV). For most patients, replacing FF beams with FFF beams improved target coverage, tumour control, and uncomplicated tumour control probabilities. Conclusions: Monte Carlo tends to reveal deficiencies in target coverage compared to coverage predicted by the TPS. Our data support previously reported benefits of using FFF beams for lung SBRT.

SU-FF-T-438: Treatment Planning Study of Prostate Cancer IMRT with a Flattening Filter Free Accelerator

2006 ◽  
Vol 33 (6Part13) ◽  
pp. 2146-2146
Author(s):  
S Kry ◽  
O Vassiliev ◽  
D Kuban ◽  
F Poenisch ◽  
M Salehpour ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Treatment Planning ◽  
Planning Study ◽  
Flattening Filter Free ◽  
Flattening Filter

scholarly journals Studi Awal Pengukuran Daisy Chaining Detektor Ionisasi pada Berkas Foton 6 MV Flattening Filter Free Lapangan Kecil

2020 ◽  
Vol 12 (1) ◽  
pp. 16-25
Author(s):  
Assef Firnando Firmansyah ◽  
Okky Agassy Firmansyah ◽  
Nurman Rajagukguk ◽  
Dea Ryangga
Keyword(s):  
Treatment Planning ◽  
Planning System ◽  
Treatment Planning System ◽  
Flattening Filter Free ◽  
Flattening Filter

Salah satu alternatif untuk melakukan kalibrasi detektor ionisasi kecil pada lapangan radiasi kecil adalah dengan melakukan pengukuran daisy chaining. Makalah ini menguraikan pengukuran daisy chaining detektor ionisasi kecil pada berkas foton 6 MV flattening filter free lapangan radiasi kecil. Langkah pertama pengukuran daisy chaining adalah melakukan kalibrasi detektor ionisasi medium 0,13 cm3 terhadap detektor ionisasi standar 0,6 cm3 pada lapangan radiasi 10 cm × 10 cm. Setelah mendapatkan faktor kalibrasi dosis serap air (ND,W) dari detektor ionisasi medium, langkah berikutnya adalah menggunakan ND,W tersebut untuk mengalibrasi silang detektor ionisasi mikro 0,016 cm3 pada lapangan 5 cm × 5 cm. ND,W hasil kalibrasi tersebut dapat digunakan untuk pengukuran di lapangan radiasi kurang dari 5 cm × 5 cm. Penentuan laju dosis serap air dilakukan di lapangan 3 cm × 3 cm dan 2 cm × 2 cm. Verifikasi dilakukan dengan membandingkan hasil penentuan laju dosis serap air menggunakan ND,W hasil pengukuran daisy chaining, pengukuran langsung menggunakan ND,W detektor ionisasi tanpa pengukuran daisy chaining dan hasil perhitungan dari treatment planning system (TPS). Hasil yang diperoleh menunjukkan adanya perbedaan antara pengukuran daisy chaining, pengukuran langsung, dan hasil perhitungan TPS. Perbedaan masih dalam rentang kurang dari 3%.

Sign in / Sign up

Export Citation Format

Share Document