Reduction of Dosimetric‐based Internal Target Volume Margin for Respiratory Motion in Lung Stereotactic Body Radiotherapy with Nonuniform Volume Prescription Method

2021 ◽  
Author(s):  
Hirokazu Masuda ◽  
Daisuke Kawahara ◽  
Tomoki Kimura ◽  
Shuichi Ozawa ◽  
Takeo Nakashima ◽  
...  
Keyword(s):  
Stereotactic Body Radiotherapy ◽  
Respiratory Motion ◽  
Target Volume ◽  
Internal Target ◽  
Internal Target Volume

Investigation of approaches for internal target volume definition using 4-dimensional computed tomography in stereotactic body radiotherapy of lung cancer

2020 ◽  
Author(s):  
Canan Koksal ◽  
Nazmiye Donmez Kesen ◽  
Murat Okutan ◽  
Sule Karaman ◽  
Nergiz Dagoglu Sakin ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Lung Cancer ◽  
Stereotactic Body Radiotherapy ◽  
Target Volume ◽  
Internal Target ◽  
Internal Target Volume ◽  
Target Volume Definition

scholarly journals EP-1660: Interfraction Internal Target Volume dose coverage in Stereotactic Body Radiotherapy for infradiafragmatic tumor

2015 ◽  
Vol 115 ◽  
pp. S909-S910
Author(s):  
M. Asensio Martinez ◽  
V. Borreda Talon ◽  
J.L. Monroy Anton ◽  
J. Hernandis Barbera ◽  
M.J. Marco Collado
Keyword(s):  
Stereotactic Body Radiotherapy ◽  
Target Volume ◽  
Internal Target ◽  
Internal Target Volume

SU-EE-A1-04: Verifying Internal Target Volume Using Cone-Beam CT for Stereotactic Body Radiotherapy Treatment

2006 ◽  
Vol 33 (6Part2) ◽  
pp. 1991-1991 ◽  
Author(s):  
Z Wang ◽  
F Yin ◽  
S Yoo ◽  
Q Wu ◽  
C Willett ◽  
...  
Keyword(s):  
Stereotactic Body Radiotherapy ◽  
Cone Beam Ct ◽  
Target Volume ◽  
Cone Beam ◽  
Internal Target ◽  
Internal Target Volume ◽  
Radiotherapy Treatment

scholarly journals Robust Optimization of SBRT Planning for Patients With Early Stage Non-Small Cell Lung Cancer

2020 ◽  
Vol 19 ◽  
pp. 153303382091650
Author(s):  
Haijiao Shang ◽  
Yuehu Pu ◽  
Yuenan Wang
Keyword(s):  
Robust Optimization ◽  
Planning Target Volume ◽  
Stereotactic Body Radiotherapy ◽  
Target Volume ◽  
Band Width ◽  
Radiotherapy Planning ◽  
Dose Volume Histogram ◽  
Internal Target ◽  
Internal Target Volume ◽  
Dose Volume

Purpose: Setup uncertainty is a known challenge for stereotactic body radiotherapy planning. Using the internal target volume-based robust optimization was proposed as a more accurate way than the conventional planning target volume-based optimization when considering the robustness criteria. In this study, we aim to investigate the feasibility of internal target volume-based robust optimization in stereotactic body radiotherapy planning using 4-dimensional computed tomography and develop a novel dose–volume histogram band width metric to quantitatively evaluate robustness. Method and Materials: A total of 50 patients with early stage non-small cell lung cancer, who underwent stereotactic body radiotherapy, were retrospectively selected. Each of the 50 patients had 2 stereotactic body radiotherapy plans: one with the conventional planning target volume-based optimization and the other with patient-specific robustly optimized internal target volume and with a uniform 5 mm setup error. These were compared with the planning target volume-based optimization method based on both plan quality and robustness. The quality was evaluated using dosimetric parameters and radiobiology parameters, such as high-dose spillage ( V 90%RX, conformity index), intermediate-dose spillage (dose falloff products), low-dose spillage (normal tissue: V 50%RX), and lung tissue complication probability. The robustness was evaluated under a uniform 3 to 5 mm setup errors with a novel proposed metric: dose–volume histogram band width. Results: When compared with planning target volume-based optimization plans, the internal target volume-based robust optimization plans have better conformity of internal target volume coverage (conformity index: 1.17 vs 1.27, P < .001), intermediate-dose spillage (dose falloff product: 129 vs 167, P < .001), low-dose spillage in normal tissue ( V 50%RX: 0.8% vs 1.5%, P < .05), and lower risk of radiation pneumonitis (lung tissue complication probability: 4.2% vs 5.5%, P < .001). For the robustness, dose–volume histogram band width analysis shows that the average values in internal target volume, D 95%, D 98%, and D 99%, of internal target volume-based robust optimization are smaller than that of planning target volume-based optimization (unit cGy) under 3-, 4-, and 5-mm setup uncertainties (3-mm setup uncertainty: 42 vs 73 cGy; 4-mm setup uncertainty: 88 vs 176 cGy; 5-mm setup uncertainty: 229 vs 490 cGy), which might indicate that internal target volume-based robust optimization harbored a greater robustness regardless of the setup errors. Conclusions: Internal target volume-based robust optimization may have clinical potential in offering better plan quality in both target and organs at risk and lower risk of radiation pneumonitis. In addition, the proposed internal target volume-based robust optimization may demonstrate robustness regardless of different setup uncertainties in the stereotactic body radiotherapy planning. Registration: Retrospective study with local ethics committee approval.

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