ESTRO 2024 - Abstract Book

S3750

Physics - Image acquisition and processing

ESTRO 2024

Conclusion:

There is large inter-observer variability in anatomical landmark placements on pelvic CT scans, especially in regions with large deformations. Future validation studies of DIR methods could take the measured variability in this study as a lower bound for meaningfully achievable accuracy on CT scans in the pelvic region. These results also call for additional inter-observer variability studies in other regions and for other (combinations of) imaging modalities.

Keywords: anatomical landmarks, inter-observer variability

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Digital Poster

Hit the right vertebra on CBCT: A robust safeguard against labeling errors in a “one-stop-shop”

Jochem J Kaas, Erik van der Bijl, Paulien G Westhoff, Martijn Kusters, René Monshouwer

Radboudumc, Radiotherapy, Nijmegen, Netherlands

Purpose/Objective:

About half the number of treatments in a radiotherapy department are in the palliative setting. Of those a large fraction involve the irradiation of painful metastases of the vertebra. Identification of the correct vertebra is of paramount importance in the automatic creation of a treatment plan. Removing the need for a dedicated planning CT would be a substantial improvement in the time in hospital for the patient. This requires identifying the correct vertebra on the CBCT.