Dependence of volume dose indices on dose calculation algorithms for VMAT-SBRT plans for peripheral lung tumor

Matsuoka, Takanori; Araki, Fujio; Ohno, Tomohiro; Sakata, Junichi; Tominaga, Hirofumi

doi:10.1016/j.meddos.2018.10.004

Cited by 5 publications

(20 citation statements)

References 25 publications

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“…Regarding PTV coverage parameters, our results differed from those published in the literature. While we found a lower D 95 and no significant difference in D 98 when comparing AAA with AXB, it is widely reported that AAA overestimates these parameters and the minimum dose 7,9,[18][19][20][21][22][25][26][27]30 . The reason for this discrepancy is that while our plans were initially optimized for AXB and then recalculated, keeping identical beam parameters for AAA, most prior studies adopted the opposite method.…”

Section: Discussioncontrasting

confidence: 75%

“…An important aspect of our study concerns the change introduced with AXB v11 regarding the determination of tissue types from CT images 32,33 . The version of AXB used in our study could produce different results than those previously obtained in studies that used v10 [7][8][9]21,25,26,30 .…”

Section: Treatment Planning and Dose Calculationcontrasting

confidence: 74%

“…To our knowledge, ours is the largest study to date comparing AXB (Dm and Dw) and AAA in lung patients undergoing SBRT. Previous studies have included up to 37 patients 9,19,23,28 , or present results for Dm mode only 7,8,18,24,26,27 , and most report only PTV or lung-related dosevolume parameters 7,8,18,[20][21][22][23][24][25][27][28][29] .…”

Section: Discussionmentioning

confidence: 99%

“…Several studies have assessed the implications of using AXB for lung SBRT treatment planning [7][8][9][18][19][20][21][22][23][24][25][26][27][28][29][30] . In most cases, the impact in dose-volume parameters is below 2% except for the target coverage, which is considerably lower, and the Dw maximum dose in bony structures, which is significantly higher, in AXB-recalculated plans, as happens when MC is adopted 31 .…”

Section: Introductionmentioning

confidence: 99%

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Dosimetric Impact of Acuros XB Dose-to-Water and Dose-to-Medium Reporting Modes on Lung Stereotactic Body Radiation Therapy and Its Dependency on Structure Composition

Muñoz-Montplet

Fuentes-Raspall

Jurado-Bruggeman

et al. 2021

Advances in Radiation Oncology

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Section: Discussioncontrasting

confidence: 75%

Section: Treatment Planning and Dose Calculationcontrasting

confidence: 74%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dosimetric Impact of Acuros XB Dose-to-Water and Dose-to-Medium Reporting Modes on Lung Stereotactic Body Radiation Therapy and Its Dependency on Structure Composition

Muñoz-Montplet

Fuentes-Raspall

Jurado-Bruggeman

et al. 2021

Advances in Radiation Oncology

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“…17,18 The AAA algorithm was used in part because it is the most common clinical calculation algorithm in Eclipse. There is justification for this choice in an evaluation performed by Matsuoka et al 19 showing good precision for determination of the quantity V 50% /V 100% , a quantity similar to R50%. In addition, Matsuoka et al showed that for SBRT targets with near uniform density, various dose indices such as D 95% and D 50% are essentially independent of dose calculation algorithm.…”

Section: Rtog Himentioning

confidence: 99%

A physically meaningful relationship between R50% and PTV surface area in lung SBRT

Desai

Cordrey

Johnson

2020

J Applied Clin Med Phys

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Purpose We propose a novel understanding of two characteristics of the planning target volume (PTV) that affect the intermediate‐dose spill in lung stereotactic body radiation therapy (SBRT) as measured by R50%. This phantom model research investigates two characteristics of the PTV that have a marked effect on the value of R50%: the mean dose deposited within the PTV (Dav) and the surface area of the PTV (SAPTV). Methods Using a phantom model provided by a CT of the IROC Thorax‐Lung Phantom® (IROC Houston QA Center, Houston, TX) and Eclipse® Treatment Planning System (Varian Medical Systems, Palo Alto, CA), we investigate the two characteristics for spherical and cylindrical PTVs. A total of 135 plans with tightly controlled PTV characteristics are employed. A lower bound for R50% (R50%min∆r) is derived and clearly establishes a relationship between R50% and SAPTV that has not been fully appreciated previously. Results The study of PTV Dav revealed a local minimum for R50% as a function of the PTV Dav at Dav ≈ 110% of Rx dose. As PTV Dav increases above this local minimum, R50% increases; while for PTV Dav less than this local minimum, the R50% value also increases. The study of PTV surface area (SAPTV) demonstrated that as the SAPTV increases, the R50% increases if the PTV volume stays the same. The SAPTV result is predicted by the theoretical investigation that yields the R50% lower bound, R50%min∆r. Conclusions This research has identified two characteristics of the PTV that have a marked influence on R50%: PTV Dav and SAPTV. These characteristics have not been clearly articulated in the vast body of previous research in SBRT. These results could help explain plans that cannot meet the RTOG criteria for R50%. With further development, these concepts could be extended to provide additional guidance for creating acceptable SBRT plans.

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Dose prescription for stereotactic body radiotherapy: general and organ-specific consensus statement from the DEGRO/DGMP Working Group Stereotactic Radiotherapy and Radiosurgery

Brunner,

Boda-Heggemann,

Bürgy

et al. 2024

Strahlenther Onkol

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Purpose and objective To develop expert consensus statements on multiparametric dose prescriptions for stereotactic body radiotherapy (SBRT) aligning with ICRU report 91. These statements serve as a foundational step towards harmonizing current SBRT practices and refining dose prescription and documentation requirements for clinical trial designs. Materials and methods Based on the results of a literature review by the working group, a two-tier Delphi consensus process was conducted among 24 physicians and physics experts from three European countries. The degree of consensus was predefined for overarching (OA) and organ-specific (OS) statements (≥ 80%, 60–79%, < 60% for high, intermediate, and poor consensus, respectively). Post-first round statements were refined in a live discussion for the second round of the Delphi process. Results Experts consented on a total of 14 OA and 17 OS statements regarding SBRT of primary and secondary lung, liver, pancreatic, adrenal, and kidney tumors regarding dose prescription, target coverage, and organ at risk dose limitations. Degree of consent was ≥ 80% in 79% and 41% of OA and OS statements, respectively, with higher consensus for lung compared to the upper abdomen. In round 2, the degree of consent was ≥ 80 to 100% for OA and 88% in OS statements. No consensus was reached for dose escalation to liver metastases after chemotherapy (47%) or single-fraction SBRT for kidney primaries (13%). In round 2, no statement had 60–79% consensus. Conclusion In 29 of 31 statements a high consensus was achieved after a two-tier Delphi process and one statement (kidney) was clearly refused. The Delphi process was able to achieve a high degree of consensus for SBRT dose prescription. In summary, clear recommendations for both OA and OS could be defined. This contributes significantly to harmonization of SBRT practice and facilitates dose prescription and reporting in clinical trials investigating SBRT.

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Dependence of volume dose indices on dose calculation algorithms for VMAT-SBRT plans for peripheral lung tumor

Cited by 5 publications

References 25 publications

Dosimetric Impact of Acuros XB Dose-to-Water and Dose-to-Medium Reporting Modes on Lung Stereotactic Body Radiation Therapy and Its Dependency on Structure Composition

Dosimetric Impact of Acuros XB Dose-to-Water and Dose-to-Medium Reporting Modes on Lung Stereotactic Body Radiation Therapy and Its Dependency on Structure Composition

A physically meaningful relationship between R50% and PTV surface area in lung SBRT

Dose prescription for stereotactic body radiotherapy: general and organ-specific consensus statement from the DEGRO/DGMP Working Group Stereotactic Radiotherapy and Radiosurgery

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