ArticleThe British journal of radiology2019
On the determination of planning target margins due to motion for mice lung tumours using a four-dimensional MOBY phantom.
Article in The British journal of radiology, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Development of a PTV margin for preclinical irradiation of orthotopic pancreatic tumors derived from a well-known recipe for humans.Zeitschrift fur medizinische Physik · 2024Article
- Inter-observer variability of organ contouring for preclinical studies with cone beam Computed Tomography imaging.Physics and imaging in radiation oncology · 2022Article
- Exploring the feasibility of a clinical proton beam with an adaptive aperture for pre-clinical research.The British journal of radiology · 2019Article
- Dose painting by dynamic irradiation delivery on an image-guided small animal radiotherapy platform.The British journal of radiology · 2019Article
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Authors and funding
6 authors.
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Abstract
objective: This work aims to analyse the effect of respiratory motion on optimal irradiation margins for murine lung tumour models.
methods: Four-dimensional mathematical phantoms with different lung tumour locations affected by respiratory motion were created. Two extreme breathing curves were adopted and divided into time-points. Each time-point was loaded in a treatment planning system and Monte Carlo (MC) dose calculations were performed for a 360° arc plan. A time-resolved dose was derived, considering the gantry rotation and the breathing motion. Radiotherapy metrics were derived to assess the final treatment plans. An interpolation function was investigated to reduce calculation cost.
results: The effect of respiratory motion on the treatment plan quality is strongly dependent on the breathing pattern and the tumour position. Tumours located closer to the diaphragm required a compromise between tumour conformity and healthy tissue damage. A recipe, which considers collimator size, was proposed to derive tumour margins and spare the organs at risk (OARs) by respecting constraints on user-defined metrics.
conclusion: It is recommended to add a target margin, especially on sites where movement is substantial. A simple recipe to derive tumour margins was developed. ADVANCES IN KNOWLEDGE:: This work is a first step towards a standard planning target volume concept in pre-clinical radiotherapy.
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