Evaluation of organ-at-risk dose reduction with jaw tracking technique in flattening filter-free beams in lung stereotactic body radiation therapy

2019 ◽  
Vol 61 ◽  
pp. 70-76 ◽  
Author(s):  
Yu Murakami ◽  
Taiki Magome ◽  
Fumiyasu Matsubayashi ◽  
Ryo Takahashi ◽  
Masato Arima ◽  
...  
Keyword(s):  
At Risk ◽  
Radiation Therapy ◽  
Dose Reduction ◽  
Stereotactic Body Radiation Therapy ◽  
Stereotactic Body Radiation ◽  
Tracking Technique ◽  
Flattening Filter Free ◽  
Flattening Filter ◽  
Organ At Risk

Impact of lung tumor motion on dose delivered to organ at risk in lung stereotactic body radiation therapy

2020 ◽  
Vol 9 (3-4) ◽  
pp. 191-198
Author(s):  
Milovan Savanovic ◽  
Bojan Strbac ◽  
Drazan Jaros ◽  
Dejan Cazic ◽  
Jean Noel Foulquier
Keyword(s):  
At Risk ◽  
Radiation Therapy ◽  
Stereotactic Body Radiation Therapy ◽  
Lung Tumor ◽  
Tumor Motion ◽  
Stereotactic Body Radiation ◽  
Organ At Risk

scholarly journals Adrenal Stereotactic Body Radiation Therapy: The Effects of a Full and Empty Stomach on Radiation Dose to Organs at Risk

2021 ◽  
Author(s):  
Osamu Tanaka ◽  
Takuya Taniguchi ◽  
Kousei Ono ◽  
Shuto Nakaya ◽  
Takuji Kiryu ◽  
...  
Keyword(s):  
At Risk ◽  
Radiation Therapy ◽  
Stereotactic Body Radiation Therapy ◽  
Organs At Risk ◽  
Left Kidney ◽  
Empty Stomach ◽  
Full Group ◽  
Left Adrenal Gland ◽  
Stereotactic Body Radiation ◽  
Organ At Risk

Abstract BackgroundStereotactic Body Radiation Therapy (SBRT) has been reported to be curative in the treatment of oligometastases to the adrenal glands. However, the adrenals are surrounded by radiation-sensitive organs. We performed an Organ at Risk (OAR) analysis for SBRT to the left adrenal gland based on gastric state.Patients and MethodsTwenty random stomachs were divided into “empty” or “full” groups of 10 each based on size. The PTV dose was 54 Gy/6 fx and D 95 coverage of PTV(CTV) (the dose to 95% of the PTV volume). ResultsThe gastric OAR dose in the empty group was significantly lower than the full group. The OAR dose to the left kidney in the empty group was significantly higher than in the full group.ConclusionThe smaller the stomach size, the lower the dose to the stomach. It is therefore better to perform SBRT on patients with an empty stomach.

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.

The Dosimetric Impact of Interfractional Organ-at-Risk Movement During Liver Stereotactic Body Radiation Therapy

2019 ◽  
Vol 9 (6) ◽  
pp. e549-e558 ◽  
Author(s):  
Ryan K. Schmid ◽  
An Tai ◽  
Slade Klawikowski ◽  
Michael Straza ◽  
Khalid Ramahi ◽  
...  
Keyword(s):  
At Risk ◽  
Radiation Therapy ◽  
Stereotactic Body Radiation Therapy ◽  
Stereotactic Body Radiation ◽  
Organ At Risk
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