title: Procedure for creating a three-dimensional (3D) model for superficial hyperthermia treatment planning.
abstract: OBJECTIVE
  To make a patient- and treatment-specific computed tomography (CT) scan and to create a three-dimensional (3D) patient model for superficial hyperthermia treatment planning (SHTP).
  
  
  METHODS
  Patients with recurrent breast adenocarcinoma in previously irradiated areas referred for radiotherapy (RT) and hyperthermia (HT) treatment and giving informed consent were included. After insertion of the thermometry catheters in the treatment area, a CT scan in the treatment position was made.
  
  
  RESULTS
  A total of 26 patients have been, thus far, included in the study. During the study period, five types of adjustments were made to the procedure: (1) marking the RT field with radioopaque markers, (2) making the CT scan after the first HT treatment instead of before, (3) using an air- and foam-filled (dummy) water bolus, (4) a change to radiolucent catheters for which radioopaque markers were needed, and (5) marking the visible/palpable extent of the tumor with radioopaque markers, if necessary. With these adjustments, all necessary information is visible on the CT scan. Each CT slice was automatically segmented into muscle, fat, bone, and air. RT field, catheters, applicators, and tumor lesions, if indicated, were outlined manually using the segmentation program iSeg. Next the model was imported into SEMCAD X, a 3D electromagnetic field simulator.
  
  
  CONCLUSIONS
  Using the final procedure to obtain a patient- and treatment-specific CT scan, it is possible to create a 3D model for SHTP.
authors: Erasmus MC Rotterdam, Department of Radiation Oncology, Hyperthermia Unit, Rotterdam, The Netherlands. m.linthorst@erasmusmc.nl
authors: Marianne
authors: M
authors: Linthorst
authors: Tomas
authors: T
authors: Drizdal
authors: Hans
authors: H
authors: Joosten
authors: Gerard C
authors: GC
authors: van Rhoon
authors: Jacoba
authors: J
authors: van der Zee
mesh_terms: D000230:Adenocarcinoma / Q000000981:diagnostic imaging* / Q000532:radiotherapy*; D001943:Breast Neoplasms / Q000000981:diagnostic imaging* / Q000532:radiotherapy*; D003131:Combined Modality Therapy; D005260:Female; D006801:Humans; D006979:Hyperthermia, Induced / Q000379:methods*; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D061330:Multidetector Computed Tomography / Q000379:methods*; D009364:Neoplasm Recurrence, Local / Q000000981:diagnostic imaging* / Q000628:therapy*; D056888:Patient Positioning; D011880:Radiotherapy Planning, Computer-Assisted / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*