ESTRO 2025 - Abstract Book

S2947

Physics - Image acquisition and processing

ESTRO 2025

fig 2 : Contrast to noise results for patient CBCTs. Direct comparison of CBCTs showed that in 62% of the instances, Acuros was preferred, and no preference was reported in 20% (sum 82%). In the entire cohort of 53 patients, no (increases in) artefacts were reported using the Acuros algorithm. Conclusion: For CBCT in the pelvis, where X-ray contrast is low, the Acuros algorithm performs better in a phantom. For clinical data, Acuros is the better AND preferred reconstruction algorithm in about 80%. Although the cause of this discrepancy needs to be elucidated, use of Acuros for NHES is recommended.

Keywords: Image quality, CBCT, Acuros

References: 1) Ditte Sloth Moller 2022, Survival benefits for non-small cell lung cancer patients treated with adaptive radiotherapy, https://doi.org/10.1016/j.radonc.2022.01.039 2) Adam Wang et.al. 2018 Acuros CTS: A fast, linear Boltzmann transport equation solver for computed tomography scatter - Part II: System modeling, scatter correction, and optimization https://doi.org/10.1002/mp.12849 3) Kyoto Kagaku Co., Ltd, Japan

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Digital Poster Assessing the Necessity of a Receive Coil Holder in Pelvic MR-Only Treatment Planning: Interim Results from the MR.pelvis Study at a 0.55T system Florian Putz 1 , Sandy Schmidt 2 , Hans-Peter Fautz 3 , Sylvain Doussin 4 , Christoph Dickmann 4 , Josan Sonal 4 , Julia Keller 1 , Daniel Höfler 1 , Philipp Schubert 1 , Alexander Weiss 1 , Oliver Rompel 2 , Juliane Szkitsak 1 , Jana Hutter 2 , Christoph Bert 1 , Michael Uder 2 , Rainer Fietkau 1 1 Department of Radiation Oncology, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen Nürnberg, Erlangen, Germany. 2 Department of Radiology, University Hospital Erlangen, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany. 3 Imaging Science Institute Erlangen, University Hospital Erlangen, Erlangen, Germany. 4 Siemens Healthineers AG, Siemens Healthineers AG, Erlangen, Germany

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