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06.06.2018 | Research Article

Inter-observer variation of hippocampus delineation in hippocampal avoidance prophylactic cranial irradiation

verfasst von: F. Bartel, M. van Herk, H. Vrenken, F. Vandaele, S. Sunaert, K. de Jaeger, N. J. Dollekamp, C. Carbaat, E. Lamers, E. M. T. Dieleman, Y. Lievens, D. de Ruysscher, S. B. Schagen, M. B. de Ruiter, J. C. de Munck, J. Belderbos

Erschienen in: Clinical and Translational Oncology | Ausgabe 2/2019

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Abstract

Background

Hippocampal avoidance prophylactic cranial irradiation (HA-PCI) techniques have been developed to reduce radiation damage to the hippocampus. An inter-observer hippocampus delineation analysis was performed and the influence of the delineation variability on dose to the hippocampus was studied.

Materials and methods

For five patients, seven observers delineated both hippocampi on brain MRI. The intra-class correlation (ICC) with absolute agreement and the generalized conformity index (CI_gen) were computed. Median surfaces over all observers’ delineations were created for each patient and regional outlining differences were analysed. HA-PCI dose plans were made from the median surfaces and we investigated whether dose constraints in the hippocampus could be met for all delineations.

Results

The ICC for the left and right hippocampus was 0.56 and 0.69, respectively, while the CI_gen ranged from 0.55 to 0.70. The posterior and anterior-medial hippocampal regions had most variation with SDs ranging from approximately 1 to 2.5 mm. The mean dose (D_mean) constraint was met for all delineations, but for the dose received by 1% of the hippocampal volume (D_1%) violations were observed.

Conclusion

The relatively low ICC and CI_gen indicate that delineation variability among observers for both left and right hippocampus was large. The posterior and anterior-medial border have the largest delineation inaccuracy. The hippocampus D_mean constraint was not violated.

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Titel: Inter-observer variation of hippocampus delineation in hippocampal avoidance prophylactic cranial irradiation
verfasst von: F. Bartel
M. van Herk
H. Vrenken
F. Vandaele
S. Sunaert
K. de Jaeger
N. J. Dollekamp
C. Carbaat
E. Lamers
E. M. T. Dieleman
Y. Lievens
D. de Ruysscher
S. B. Schagen
M. B. de Ruiter
J. C. de Munck
J. Belderbos
Publikationsdatum: 06.06.2018
Verlag: Springer International Publishing
Erschienen in: Clinical and Translational Oncology / Ausgabe 2/2019
Print ISSN: 1699-048X
Elektronische ISSN: 1699-3055
DOI: https://doi.org/10.1007/s12094-018-1903-7

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Inter-observer variation of hippocampus delineation in hippocampal avoidance prophylactic cranial irradiation