Effect of Minimum Segment Width on Gamma Passing Rate Considering MLC Position Error for Volumetric Modulated Arc Therapy

Moon, Young Min; Bae, Sang Il; Choi, Chul Won; Jeon, Wha Sook; Kim, Jin Young; Lee, Man Woo; Ro, Tae-Ik

doi:10.3938/jkps.74.724

Cited by 5 publications

(9 citation statements)

References 17 publications

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“…Previous studies have identified the effects of MSW on the quality of VMAT plans for multiple VMAT cases in clinical treatment. 8 , 26 , 27 , 28 Wang et al. and Nithyanantham et al.…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies have identified the effects of MSW on the quality of VMAT plans for multiple VMAT cases in clinical treatment. 8,[26][27][28] Wang et al and Nithyanantham et al reported the influence of MSW on the quality and delivery accuracy of VMAT plans for cervix cancer and stereotactic body radiotherapy. 8,26 The studies demonstrated a similar result to the present study with regards to reduced MU and treatment time with increased MSW.…”

Section: Plan Deliverability (Difference-tps Vs Measured)mentioning

confidence: 99%

“…[22][23][24][25] Previous studies have reported the optimal MSW in terms of VMAT plan quality using GI analysis for specific treatment sites. 8,[26][27][28] However, as of now, there are no reports of optimal MSW for all sites and their clinical significance on plan deliverability using DVH analysis. The purpose of this work was to study the effect of MSW on dose distribution in patients undergoing VMAT for various treatment sites using DVH analysis, utilizing Compass verification system and Dolphin detector.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of optimum minimum segment width on VMAT plan quality and deliverability: A comprehensive dosimetric and clinical evaluation using DVH analysis

Yoosuf

Ahmad

Al-Shehri

et al. 2021

J Applied Clin Med Phys

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Minimum segment width (MSW) plays a fundamental role in the shaping of optimized apertures and creation of segments of varying sizes and shapes in complex radiotherapy treatment plans. The purpose of this work was to study the effect of MSW on dose distribution in patients planned with VMAT for various treatment sites using dose volume histogram (DVH) analysis. Materials and methods: For the validation of optimum MSW, 125 clinical treatment plans were evaluated. Five groups were identified (brain, head and neck, thorax, pelvis, and extremity), and five cases were chosen from each group. For each case, five plans were created with different MSW (0.5, 0.8, 1.0, 1.25, and 1.5 cm). The quality of treatment plans created using different MSW were compared using dosimetric indicators such as target coverage (D 98 -dose to 98% of the planning target volume (PTV), maximum dose (D 2 -maximum dose to 2% of the PTV), monitor units (MU), and DVH parameters related to organs at risk (OAR). The effect of the MSW on delivery accuracy was quantitatively analyzed using the measured fluence utilizing ionization chamber-based transmission detector and model-based dose verification system. Traditional global gamma analysis (2%, 2 mm) and dose volume information was gathered for the PTV and organs at risk and compared for different MSWs. Results: A total of 125 plans were created and compared across five groups. In terms of treatment plan quality, the plans using MSW of 0.5 cm was found to be superior in all groups. PTV coverage (D 98 ) decreased significantly (p < 0.05) as the MSW increased. Similarly, the maximum dose (D 2 ) was found to be increased significantly (p < 0.05) as the MSW increased from 0.5 cm, with MSW of 1.5 cm being the least in terms of plan quality for both PTVs and OARs.In terms of plan deliverability using DVH analysis,treatment planning system (TPS) compared to measured fluence, VMAT plans produced with MSW of 0.5 cm showed a better dosimetric index and a smaller deviation for both PTVs and OARs. The deliverability of the plans deteriorated as the MSW increased. Conclusion: Dose volume histogram (DVH) analysis demonstrated that treatment plans with minimal MSW showed better plan quality and deliverability and provided clinical relevance as compared to gamma index analysis.

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“…Previous studies have identified the effects of MSW on the quality of VMAT plans for multiple VMAT cases in clinical treatment. 8 , 26 , 27 , 28 Wang et al. and Nithyanantham et al.…”

Section: Discussionmentioning

confidence: 99%

Section: Plan Deliverability (Difference-tps Vs Measured)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of optimum minimum segment width on VMAT plan quality and deliverability: A comprehensive dosimetric and clinical evaluation using DVH analysis

Yoosuf

Ahmad

Al-Shehri

et al. 2021

J Applied Clin Med Phys

View full text Add to dashboard Cite

show abstract

“…Small MSWs improve the quality by raising the TV coverage and protecting OARs; 7 , 28 , 29 they also prolong the treatment DT and reduce the treatment plan’s efficiency. 5 , 7 , 30 , 31 Plans with smaller MSWs require higher treatment accuracy and are more easily affected by errors in the setup and multileaf collimator position. 5 Therefore, an appropriate MSW value is essential for radiotherapy plans.…”

Section: Discussionmentioning

confidence: 99%

“…The choice of different segment settings might affect the optimization of the target area as well as the modulation and, accordingly, the plan delivery and verification passing rate. 5 , 6 Until now, few studies have reported the influence of MSW optimization on IMRT plan quality, delivery, and efficiency, 7 and no related research on esophageal cancer has been found. In this study, 20 patients suffering from local-regional stage esophageal cancer were enrolled to explore the impact of MSW values on IMRT plan quality and delivery efficiency to provide a clinical reference for the IMRT plan design for esophageal cancer.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Minimum Segment Width Parameter in the Intensity-Modulated Radiotherapy Plan for Esophageal Cancer

Hong¹,

Han²,

Luo³

et al. 2021

IJGM

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Purpose This study was designed to explore the optimal minimum segment width (MSW) in the intensity-modulated radiotherapy (IMRT) plan for esophageal cancer. Patients and Methods The imaging data of 20 esophageal cancer patients were selected for this study. Four IMRT plans were designed for each patient with MSWs of 0.5, 1.0, 1.5, and 2.0 cm. The conformity index (CI) and homogeneity index (HI) of the planning target volumes (PTV), organs at risk (OARs), control points (CP), monitor units (MU), plan delivery time (DT), and gamma passing rates (GPR) were collected and compared to appraise the treatment plan quality and delivery efficiency. Results Lower-MSW plans had larger CI and smaller HI values, and lower dose parameters of OARs and PTVs. The HI, CI, and dose parameter of OARs in the 0.5 and 1.0 cm MSW groups were similar and much better than those of the 1.5 and 2.0 cm MSW groups. Meanwhile, the plan in the 0.5 cm MSW group had significantly higher MUs, CPs, and DTs, and a significantly lower relative dose of GPR with a 3% dose difference and 3 mm distance to agreement criteria than the other three groups. Conclusion The 0.5 and 1 cm MSW groups had better dosimetric parameters and IMRT plan quality than the other groups. However, plans with 0.5 cm MSW had worse delivery accuracy and efficiency than the other three groups. Thus, MSW of 1.0 cm was the optimal choice to ensure good quality, delivery accuracy, and treatment efficiency in IMRT plans for esophageal cancer.

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The effect of changing the segment width on the volumetric modulated arc therapy (VMAT) technique for patient-specific quality assurance

Saragih,

Yaqin,

Nasution

et al. 2024

AIP Conference Proceedings

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Effect of Minimum Segment Width on Gamma Passing Rate Considering MLC Position Error for Volumetric Modulated Arc Therapy

Cited by 5 publications

References 17 publications

Investigation of optimum minimum segment width on VMAT plan quality and deliverability: A comprehensive dosimetric and clinical evaluation using DVH analysis

Investigation of optimum minimum segment width on VMAT plan quality and deliverability: A comprehensive dosimetric and clinical evaluation using DVH analysis

Optimization of Minimum Segment Width Parameter in the Intensity-Modulated Radiotherapy Plan for Esophageal Cancer

The effect of changing the segment width on the volumetric modulated arc therapy (VMAT) technique for patient-specific quality assurance

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