EP-1383: Experimental evaluation of high density ArcCHECK mode for SBRT verification

Montes, Elena; Modolell, Inés; Blas, R. De; Sancho, I.; Puxeu, Josep; Reynés, G.; Picón, C.

doi:10.1016/s0167-8140(15)41375-1

Cited by 3 publications

(1 citation statement)

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“…The MapCheck2 is diode detector array with a resolution of 0.8 × 0.8 mm 2 , a diagonal detector spacing of 7.07 mm, and 1 cm parallel detector spacing.In 2017,Woon et al 29 observed a lack of correlation between GPR and percentage of dose error of the DVH metrics in MapCheck2 and ArcCHECK. Also, Montes et al 30 showed the GPR of SD and HD measurement modes of ArcCHECK phantom was almost the same and there were no differences in acceptance between both modes. Since no differences in acceptance between these modes for Arc-Check phantom were found and due to HD mode being more time consuming requiring two measurements and additional analysis steps, the SD mode is more clinically preferable.…”

Section: Sd Versus Hd Modementioning

confidence: 96%

Evaluation of parameters affecting gamma passing rate in patient‐specific QAs for multiple brain lesions IMRS treatments using ray‐station treatment planning system

Salari

Parsai

Shvydka

et al. 2021

J Applied Clin Med Phys

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Using intensity-modulated radiosurgery (IMRS) with single isocenter for the treatment of multiple brain lesions has gained acceptance in recent years. One of the challenges of this technique is conducting a patient-specific quality assurance (QA), involving accurate gamma passing rate (GPR) calculations for small and wide spread-out targets. We evaluated effects of parameters such as dose grid and energy on GPR using our clinical IMRS plans. Methods: Ten patients with total of 40 volumetric modulated arc therapy (VMAT) plans were created in Raystation (V.8A) treatment planning system (TPS) for the Varian Edge Linac using 6 and 10 flattening filter-free (FFF) beams and planned dose grids of 1 mm and 2 mm resulting in four plans with 6-10 targets per patient. All parameters and objectives except dose grid and energy were kept the same in all plans. Next, patient-specific QAs were measured evaluating GPR with 10% threshold, 3%/3 mm objective, and an acceptance criterion of 95%. Modulation factors (MF) and confidence intervals were calculated. Two modes of measurements, standard density (SD) and high density (HD), were used. Results: Generally, plans computed with 1 mm dose grid have higher GPRs than those with 2 mm dose grid for both energies used. The GPRs of 6 FFF plans were higher than those of 10 FFF plans. GPR showed no noticeable difference between HD and SD measurements. Negative correlation between MF and GPR was observed. The HD pass rates fall within the confidence interval of SD. Conclusion: Calculated dose grid should be less than or equal to one-third of distance to agreement, thus 1 mm planned dose grid is recommended to reduce artifacts in gamma calculation. GPR of SD and HD measurement modes is almost the same, which indicates that SD mode is clinically preferable for performing patient-specific QAs. According to our results, using 6 FFF beams with 1 mm planned dose grid is more accurate and reliable for dose calculation of IMRS plans.

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Section: Sd Versus Hd Modementioning

confidence: 96%

Evaluation of parameters affecting gamma passing rate in patient‐specific QAs for multiple brain lesions IMRS treatments using ray‐station treatment planning system

Salari

Parsai

Shvydka

et al. 2021

J Applied Clin Med Phys

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Evaluating the effect of high-density measurement mode on patient-specific quality assurance for head and neck cancer with ArcCHECK

et al. 2022

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Evaluación del desempeño de tres dispositivos dosimétricos para el control de calidad paciente específico en radiocirugía

Montaña

Bravo

2021

rev. investig. apl. nucl.

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Se evalúo el desempeño de tres sistemas dosimétricos en el control de calidad paciente específico, para casos de tratamientos de radiocirugía de volúmenes blanco entre 0,7-8,7 cm3. Se analizaron veinte planes de tratamiento de radiocirugía realizados con la técnica VMAT, calculados con el TPS Monaco. Se evaluó la dosis a punto con una cámara de ionización pinpoint dentro del inserto denominado Cavity PlugTM del dispositivo ArcCHECK, y se evaluaron las distribuciones de dosis mediante la función gamma-3D en el sistema ArcCHECK y mediante la función gamma-2D con el sistema dosimétrico conformado por película radiocrómica PRC-EBT3 y escáner Epson 10000XL, aplicando el criterio 5 %/2 mm cuando TH = 50 %. Usando el modo normal y de alta densidad del dispositivo ArcCHECK se evaluaron planes de tratamiento previamente calculados y aplicados en pacientes, teniendo en cuenta los criterios: 5 %/2 mm, 5 %/1 mm, 3 %/3 mm, 3 %/2 mm y 2 %/2 mm. La dosis a punto mostró una diferencia menor al ±3,5 %, el porcentaje de coincidencia de la función gamma-3D en el ArcCHECK se encontró viable únicamente para el control de calidad de planes de tratamiento de intensidadmodulada de volúmenes mayores a 0,7 cm3, aplicando el criterio 3 %/3 mm y TH = 50 %, en modo de alta densidad. La coincidencia gamma-2D en la PRC-EBT3 mostró porcentajes de aprobación gamma entre 91-100 % para el criterio 5 %/2 mm con TH = 50 %; dada su alta resolución espacial, este dispositivo puede proporcionar información de la distribución de la dosis en volúmenes de tratamiento de radiocirugía mayores a 0,7 cm3 con el uso de un porcentaje de aprobación propuesto arriba del 85 % cuando se utiliza el criterio 5 %/1 mm y TH = 50 %.

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EP-1383: Experimental evaluation of high density ArcCHECK mode for SBRT verification

Cited by 3 publications

References 0 publications

Evaluation of parameters affecting gamma passing rate in patient‐specific QAs for multiple brain lesions IMRS treatments using ray‐station treatment planning system

Evaluation of parameters affecting gamma passing rate in patient‐specific QAs for multiple brain lesions IMRS treatments using ray‐station treatment planning system

Evaluating the effect of high-density measurement mode on patient-specific quality assurance for head and neck cancer with ArcCHECK

Evaluación del desempeño de tres dispositivos dosimétricos para el control de calidad paciente específico en radiocirugía

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