Page 54 - Organ motion in children for high-precision radiotherapy - Sophie Huijskens

Appendix 3
CBCT to CT organ registration
In some patients one or both kidneys or the diaphragm could not be registered. Reasons for non- registration were for example nephrectomy in Wilms’ tumor patients, a small field of view (FOV) so that the concerning organ was not included in the cone beam CT scans (CBCTs), or insufficient visibility due to (breathing) artefacts. In a number of children treated with craniospinal irradiation, diaphragm and kidneys were registered in separate thoracic and abdominal images, respectively. This resulted in analyses of 24 right and 29 left kidneys (in 344 CBCTs), and 30 diaphragms (in 357 CBCTs) in the children. For the adults we analyzed 32 right and 35 left kidneys, and 27 diaphragms in 476 CBCTs with a FOV large enough to include both the diaphragm and kidneys.
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