title: MR-CT registration using a Ni-Ti prostate stent in image-guided radiotherapy of prostate cancer.
abstract: OBJECTIVE
  In image-guided radiotherapy of prostate cancer defining the clinical target volume often relies on magnetic resonance (MR). The task of transferring the clinical target volume from MR to standard planning computed tomography (CT) is not trivial due to prostate mobility. In this paper, an automatic local registration approach is proposed based on a newly developed removable Ni-Ti prostate stent.
  
  
  METHODS
  The registration uses the voxel similarity measure mutual information in a two-step approach where the pelvic bones are used to establish an initial registration for the local registration.
  
  
  RESULTS
  In a phantom study, the accuracy was measured to 0.97 mm and visual inspection showed accurate registration of all 30 data sets. The consistency of the registration was examined where translation and rotation displacements yield a rotation error of 0.41° ± 0.45° and a translation error of 1.67 ± 2.24 mm.
  
  
  CONCLUSIONS
  This study demonstrated the feasibility for an automatic local MR-CT registration using the prostate stent.
authors.affiliation: Department of Health Science and Technology, Aalborg University, Aalborg 9220, Denmark. asko@hst.aau.dk
authors.forename: Anne Sofie
authors.initials: AS
authors.lastname: Korsager
authors.forename: Jesper
authors.initials: J
authors.lastname: Carl
authors.forename: Lasse Riis
authors.initials: LR
authors.lastname: Østergaard
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D057918:Fiducial Markers; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000706:statistics & numerical data*; D008297:Male; D064847:Multimodal Imaging / Q000295:instrumentation; D009532:Nickel; D011471:Prostatic Neoplasms / Q000175:diagnosis / Q000532:radiotherapy*; D061089:Radiotherapy, Image-Guided / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D015607:Stents; D013382:Subtraction Technique / Q000295:instrumentation*; D014025:Titanium; D014057:Tomography, X-Ray Computed / Q000295:instrumentation*
chemical_list: C040654:titanium nickelide; D009532:Nickel; D014025:Titanium