Dataset Information

The ProMotion LMU dataset (2022 edition), prostate intra-fraction motion recorded by transperineal ultrasound.

ABSTRACT: Infra-fraction motion of the prostate was recorded during 2.385 fractions of image guided radiotherapy (IGRT) in 126 patients, 14 of which were treated by intensity modulated radiation therapy (IMRT), and 112 of which were treated by volumetric arc therapy (VMAT). The prostate was imaged by three-dimensional and time-resolved transperineal ultrasound (4D-US) of type Clarity by Elekta, Stockholm, Sweden. The prostate volume was registered and the prostate position (center of volume) was recorded at a frequency of 2.0 samples per second. This raw data set contains a total of 1.138.024 prostate and patient couch positions over a time span of 158 hours, 25 minutes and 50 seconds of life radiotherapy as exported by the instrument software. This data set has been used for the validation of models of prostate intra-fraction motion and for the estimation of the dosimetric impact of actual intra-fraction motion on treatment quality and side effects. We hope that this data set may be reused by other groups for similar purposes.

SUBMITTER: Ballhausen H

PROVIDER: S-EPMC9338943 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature

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The ProMotion LMU dataset (2022 edition), prostate intra-fraction motion recorded by transperineal ultrasound.

Ballhausen Hendrik H Kortmann Elena E Belka Claus C Li Minglun M

Scientific data 20220730 1

Infra-fraction motion of the prostate was recorded during 2.385 fractions of image guided radiotherapy (IGRT) in 126 patients, 14 of which were treated by intensity modulated radiation therapy (IMRT), and 112 of which were treated by volumetric arc therapy (VMAT). The prostate was imaged by three-dimensional and time-resolved transperineal ultrasound (4D-US) of type Clarity by Elekta, Stockholm, Sweden. The prostate volume was registered and the prostate position (center of volume) was recorded ...[more]

PMID: 35908072

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Project description:Highlights • We determined how motion management strategies influence treatment margins.• A simple recipe was found to determine the margin when intrafraction motion is constrained.• For a continuous drift, the margin was well approximated by assuming the target is at ¾ of the drift.• Our analysis can be used to study the benefit of different motion management strategies. Background and purpose Strategies to limit the impact of intra-fraction motion during treatment are common in radiotherapy. Margin recipes, however, are not designed to incorporate these strategies. This work aimed to provide a framework to determine how motion management strategies influence treatment margins. Materials and methods Two models of intra-fraction motion were considered. In model 1 motion was instantaneous, before treatment starts and in model 2 motion was a continuous drift during treatment. Motion management strategies were modelled by truncating the underlying error distribution at cσ, with σ the standard deviation of the distribution and c a free parameter. Using Monte Carlo simulations, we determined how motion management changed the required margin. The analysis was performed for different number of treatment fractions and different standard deviations of the underlying random and systematic errors. Results The required margin for a continuous drift was found to be well approximated by an average position of the target at ¾ of the drift. Introducing a truncation at cσ, the relative change in the margin was equal to 0.3c. This result held for both models, was independent of σ or the number of fractions and naturally generalizes to the situation with a residual (systematic) error. Conclusion Treatment margins can be determined when motion management strategies are applied. Moreover, our analysis can be used to study the potential benefit of different motion management strategies. This allows to discuss and determine the most appropriate strategy for margin reduction.

Dataset Information

The ProMotion LMU dataset (2022 edition), prostate intra-fraction motion recorded by transperineal ultrasound.

Publications

The ProMotion LMU dataset (2022 edition), prostate intra-fraction motion recorded by transperineal ultrasound.

Similar Datasets

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