Modeling of hip prostheses for use in radiotherapy planning: Validation of a photogrammetry technique

F. Zagni, F. Baruffaldi, B. Bordini, S. Stea, R. Vanini, F. Romani, M. Marengo

Research output: Contribution to journalArticlepeer-review


Treatment planning for external beams radiotherapy for patients with metallic hip prosthesis is often difficult, in particular with regards to the contouring process, in case of poor CT imaging. This may result in inaccurate dosimetry for the femoral bone and regions next to it. In this work an alternative method to obtain more accurate prosthetic contourings, based on photogrammetry, was developed. More precisely, the process of 3D modeling of a femoral prosthetic component and the conversion to DICOM was developed, plus the effective employment in a treatment planning system was evaluated. Validation of the obtained model was performed by comparing several cross sections against experimental measurements. Comparison resulted in very low deviations, showing good accuracy of the photogrammetry technique, despite the high asymmetry of the object. The tests conducted in a research TPS indicate that models obtained with the proposed method are able to provide additional information in order to better characterize such prosthetic implants.

Original languageEnglish
Article number1540021
JournalJournal of Mechanics in Medicine and Biology
Issue number2
Publication statusPublished - Apr 25 2015


  • Metal artifacts
  • Photogrammetry
  • Prostheses
  • Radiotherapy

ASJC Scopus subject areas

  • Biomedical Engineering


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