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Finer leaf resolution and steeper beam edges using a virtual isocentre in concurrence to PTV-shaped collimators in standard distance – a planning study

Please always quote using this URN: urn:nbn:de:bvb:20-opus-157543
  • Purpose: Investigation of a reduced source to target distance to improve organ at risk sparing during stereotactic irradiation (STX). Methods: The authors present a planning study with perfectly target-volume adapted collimator compared with multi-leaf collimator (MLC) at reduced source to virtual isocentre distance (SVID) in contrast to normal source to isocentre distance (SID) for stereotactic applications. The role of MLC leaf width and 20–80% penumbra was examined concerning the healthy tissue sparing. Several prescription schemes andPurpose: Investigation of a reduced source to target distance to improve organ at risk sparing during stereotactic irradiation (STX). Methods: The authors present a planning study with perfectly target-volume adapted collimator compared with multi-leaf collimator (MLC) at reduced source to virtual isocentre distance (SVID) in contrast to normal source to isocentre distance (SID) for stereotactic applications. The role of MLC leaf width and 20–80% penumbra was examined concerning the healthy tissue sparing. Several prescription schemes and target diameters are considered. Results: Paddick’s gradient index (GI) as well as comparison of the mean doses to spherical shells at several distances to the target is evaluated. Both emphasize the same results: the healthy tissue sparing in the high dose area around the planning target volume (PTV) is improved at reduced SVID ≤ 70 cm. The effect can be attributed more to steeper penumbra than to finer leaf resolution. Comparing circular collimators at different SVID just as MLC-shaped collimators, always the GI was reduced. Even MLC-shaped collimator at SVID 70 cm had better healthy tissue sparing than an optimal shaped circular collimator at SID 100 cm. Regarding penumbra changes due to varying SVID, the results of the planning study are underlined by film dosimetry measurements with Agility™ MLC. Conclusion: Penumbra requires more attention in comparing studies, especially studies using different planning systems. Reduced SVID probably allows usage of conventional MLC for STX-like irradiations.show moreshow less

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Metadaten
Author: Klaus BratengeierORCiD, Barbara Herzog, Sonja Wegener, Kostyantyn Holubyev
URN:urn:nbn:de:bvb:20-opus-157543
Document Type:Journal article
Faculties:Medizinische Fakultät / Klinik und Poliklinik für Strahlentherapie
Language:English
Parent Title (English):Radiation Oncology
Year of Completion:2017
Volume:12
Issue:88
Source:Radiation Oncology (2017) 12:88. DOI: 10.1186/s13014-017-0826-8
DOI:https://doi.org/10.1186/s13014-017-0826-8
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 61 Medizin und Gesundheit / 610 Medizin und Gesundheit
Tag:multi-leaf collimator; planning study; radiotherapy; robotic table motion; stereotactic irradiation; virtual isocentre
Release Date:2018/02/19
Collections:Open-Access-Publikationsfonds / Förderzeitraum 2017
Licence (German):License LogoCC BY: Creative-Commons-Lizenz: Namensnennung 4.0 International