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Clinical and Translational Oncology

, Volume 21, Issue 2, pp 178–186 | Cite as

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

  • 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. BelderbosEmail author
Research Article
  • 112 Downloads

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 (CIgen) 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 CIgen 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 (Dmean) constraint was met for all delineations, but for the dose received by 1% of the hippocampal volume (D1%) violations were observed.

Conclusion

The relatively low ICC and CIgen 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 Dmean constraint was not violated.

Keywords

SCLC HA-PCI Hippocampus delineation Inter-observer variation 

Notes

Acknowledgements

The authors would like to thank C. Chun for her previous work and contribution to this study. This study was funded by ZonMW (Grand Number: 104002006), the Netherlands organisation for health research and development, the Dutch Cancer Society (KWF, Grand Number: 2013-6096) and Netherlands Cancer Institute (NKI) in Amsterdam. We would also like to acknowledge the government agency for Innovation by Science and Technology (A13/TT/1503—IWT/TBM) and NutsOhra (Project 100 3-105).

Compliance with ethical standards

Conflict of interest

All authors declare that they have no competing interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

Informed consent

For this analysis no formal consent is required.

Supplementary material

12094_2018_1903_MOESM1_ESM.docx (57 kb)
Supplementary material 1 (DOCX 57 kb)

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Copyright information

© Federación de Sociedades Españolas de Oncología (FESEO) 2018

Authors and Affiliations

  • F. Bartel
    • 1
  • M. van Herk
    • 2
  • H. Vrenken
    • 1
  • F. Vandaele
    • 3
  • S. Sunaert
    • 4
  • K. de Jaeger
    • 5
  • N. J. Dollekamp
    • 6
  • C. Carbaat
    • 7
  • E. Lamers
    • 7
  • E. M. T. Dieleman
    • 8
  • Y. Lievens
    • 9
  • D. de Ruysscher
    • 10
  • S. B. Schagen
    • 11
  • M. B. de Ruiter
    • 11
  • J. C. de Munck
    • 1
  • J. Belderbos
    • 7
    Email author
  1. 1.Department of Radiology and Nuclear MedicineVU University Medical CenterAmsterdamThe Netherlands
  2. 2.Department of Cancer SciencesUniversity of ManchesterManchesterUK
  3. 3.Department of RadiotherapyIridium Cancer NetworkAntwerpBelgium
  4. 4.Department of RadiologyUniversity Hospitals LeuvenLouvainBelgium
  5. 5.Department of RadiotherapyCatharina HospitalEindhovenThe Netherlands
  6. 6.Department of RadiotherapyThe University Medical Center GroningenGroningenThe Netherlands
  7. 7.Department of RadiotherapyNetherlands Cancer InstituteAmsterdamThe Netherlands
  8. 8.Department of RadiotherapyAcademic Medical CenterAmsterdamThe Netherlands
  9. 9.Department of Radiation OncologyGhent University HospitalGhentBelgium
  10. 10.Department of RadiotherapyMaastricht University Medical CenterMaastrichtThe Netherlands
  11. 11.Division of Psychosocial Research and EpidemiologyNetherlands Cancer InstituteAmsterdamThe Netherlands

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