Comparison of the KonRad IMRT and XiO treatment planning systems

Reitz, B.; Miften, Moyed

doi:10.1120/jacmp.v9i3.2770

“…Another influence is the usage of a median filter which smoothes strong gradients within the intensity distribution. The impact depends on the dimension of the filter [ 6 ]. For dose calculation a PB algorithm is used.…”

Section: Methodsmentioning

confidence: 99%

The impact of direct aperture optimization on plan quality and efficiency in complex head and neck IMRT

Sabatino¹,

Kretschmer²,

Zink

³

et al. 2012

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BackgroundConventional step&shoot intensity modulated radio therapy (IMRT) approaches potentially lead to treatment plans with high numbers of segments and monitor units (MU) and, therefore, could be time consuming at the linear accelerator. Direct optimization methods are able to reduce the complexity without degrading the quality of the plan. The aim of this study is the evaluation of different IMRT approaches at standardized conditions for head and neck tumors.MethodFor 27 patients with carcinomas in the head and neck region a planning study with a 2-step-IMRT system (KonRad), a direct optimization system (Panther DAO) and a mixture of both approaches (MasterPlan DSS) was created. In order to avoid different prescription doses for boost volumes a simple standardization was realized. The dose was downscaled to 50 Gy to the planning target volume (PTV) which included the primary tumor as well as the bilateral lymphatic drainage (cervical and supraclavicular). Dose restrictions for the organs at risk (OAR) were downscaled to this prescription from high dose concepts up to 72 Gy. Those limits were defined as planning objectives while reaching definable PTV coverage with a standardized field setup. The parameters were evaluated from the corresponding dose volume histogram (DVH). Special attention was paid to the efficiency of the method, measured by means of calculated MU and required segments. Statistical tests of significance were applied to quantify the differences between the evaluated systems.ResultsPTV coverage for all systems in terms of V90% and V95% fell short of the requested 100% and 95%, respectively, but were still acceptable (range: 98.7% to 99.1% and 94.2% to 94.7%). Overall for OAR sparing and the burden of healthy tissue with low doses no technique was superior for all evaluated parameters. Differences were found for the number of segments where the direct optimization systems generated less segments. Lowest average numbers of MU were 308 by Panther DAO calculated for 2 Gy fractions. Based on these findings the treatment time at the linear accelerator is the lowest for Panther DAO.ConclusionsAll IMRT approaches implemented in the different treatment planning systems (TPS) generated clinically acceptable and comparable plans. No superior system in terms of PTV coverage and OAR sparing was found. Major differences in efficiency of the method in terms of calculated MU and treatment times were found.

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“…The superposition of different segments creates a modulated intensity pattern. This IMRT delivery method is called the step-and-shoot method [2,21].…”

Section: Intensity Modulated Radiation Therapy (Imrt)mentioning

confidence: 99%

A Robust 4D Treatment Planning Approach For Lung Radiotherapy

Pokhrel¹

2021

Preprint

0

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4D treatment plans are optimized to compensates for a patient's individual respiratory motion. However, changes in the time spent in the each respiratory state may render a 4D plan invalid. We introduced and evaluate two robust treatment planning approaches to compensate for respiratory motion variations. Robust 4D plans can be designed either using an average pdf approach or a worst case pdf approach. We tested these approaches on two motion variation scenarios and compared them with nominal 4D optimization and ITV plans. The nominal 4D plans were very sensitive to the variation in respiration pattern while the average pdf and worst case pdf plans were less sensitive under the similar variations. The average and worst case pdf plans were not as robust as the ITV plans but had better healthy tissue sparing. The worst case pdf approach was found to be the most promising for robust 4D plan optimization.

show abstract

“…The superposition of different segments creates a modulated intensity pattern. This IMRT delivery method is called the step-and-shoot method [2,21].…”

Section: Intensity Modulated Radiation Therapy (Imrt)mentioning

confidence: 99%

A Robust 4D Treatment Planning Approach For Lung Radiotherapy

Pokhrel¹

2021

Preprint

0

View full text Add to dashboard Cite

4D treatment plans are optimized to compensates for a patient's individual respiratory motion. However, changes in the time spent in the each respiratory state may render a 4D plan invalid. We introduced and evaluate two robust treatment planning approaches to compensate for respiratory motion variations. Robust 4D plans can be designed either using an average pdf approach or a worst case pdf approach. We tested these approaches on two motion variation scenarios and compared them with nominal 4D optimization and ITV plans. The nominal 4D plans were very sensitive to the variation in respiration pattern while the average pdf and worst case pdf plans were less sensitive under the similar variations. The average and worst case pdf plans were not as robust as the ITV plans but had better healthy tissue sparing. The worst case pdf approach was found to be the most promising for robust 4D plan optimization.

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Comparison of the KonRad IMRT and XiO treatment planning systems

Cited by 5 publications

References 19 publications

The impact of direct aperture optimization on plan quality and efficiency in complex head and neck IMRT

The impact of direct aperture optimization on plan quality and efficiency in complex head and neck IMRT

A Robust 4D Treatment Planning Approach For Lung Radiotherapy

A Robust 4D Treatment Planning Approach For Lung Radiotherapy

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