title: [Intraoperative radiotherapy--progress with a CT-assisted navigation system].
abstract: BACKGROUND
  The fact that conventional intraoperative radiotherapy (IORT) does not give the opportunity for exact documentation of the applied radiation volume and dose distribution has been criticised. We would like to introduce a system for surgical navigation and documentation of the flab positioning for intraoperative brachytherapy in afterloading flab technique.
  
  
  METHODS
  Our system consists of an electromagnetic 3D digitizer and a PC workstation. Preoperatively taken spiral CT scans of the tumour region are used for navigation and documentation of the flab positioning, analogous to the procedure in neuronavigation. Registration is done via an external reference system attached to the iliac bone of the patient.
  
  
  RESULTS
  The mean accuracy of digitalization of the 100 spheres in a pelvis model is about 2.6 +/- 0.5-3.7 +/- 0.9 mm. Mean navigation accuracy is 2.4 +/- 0.8-3.3 +/- 0.8 mm. These figures correspond to the clinical experience of our surgeons.
  
  
  CONCLUSIONS
  The optimization of the flab positioning by CT-guided navigation and the more accurate documentation of the dose volume and distribution in the patient is an important step towards improving the quality of individual radiotherapy. We are of the opinion that surgical navigation in the pelvic region should be subject to additional investigation in order to optimize the procedure.
authors.affiliation: Klinik für Allgemein-, Visceral-, Gefäss- und Thorax-Chirurgie, Chirurgische Klinik I, Klinikum Offenbach. Liutkus.Tonus@t-online.de
authors.forename: C
authors.initials: C
authors.lastname: Tonus
authors.forename: G
authors.initials: G
authors.lastname: Strassmann
authors.forename: D
authors.initials: D
authors.lastname: Debertshäuser
authors.forename: C
authors.initials: C
authors.lastname: Kolotas
authors.forename: S
authors.initials: S
authors.lastname: Walter
authors.forename: N
authors.initials: N
authors.lastname: Zamboglou
authors.forename: H
authors.initials: H
authors.lastname: Nier
mesh_terms: D001918:Brachytherapy / Q000295:instrumentation*; D015179:Colorectal Neoplasms / Q000000981:diagnostic imaging / Q000532:radiotherapy* / Q000601:surgery*; D003131:Combined Modality Therapy; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation*; D021621:Imaging, Three-Dimensional / Q000295:instrumentation*; D008953:Models, Anatomic; D009364:Neoplasm Recurrence, Local / Q000000981:diagnostic imaging / Q000532:radiotherapy / Q000601:surgery; D011880:Radiotherapy Planning, Computer-Assisted / Q000295:instrumentation*; D018714:Radiotherapy, Adjuvant; D013673:Technology Assessment, Biomedical; D014057:Tomography, X-Ray Computed / Q000295:instrumentation*