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<export-example>
  <doc>
    <id>5621</id>
    <completedYear/>
    <publishedYear/>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>reportzib</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>2015-09-28</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">3D Assessment of Osteosynthesis based on 2D Radiographs</title>
    <abstract language="eng">We present a novel method to derive the surface distance of an osteosynthesis plate w.r.t. the patient-specific surface of the distal femur based on postoperative 2D radiographs. In a first step, the implant geometry is used as a calibration object to relate the implant and the individual X-ray images spatially in a virtual X-ray setup. Second, the patient-specific femoral shape and pose are reconstructed by fitting a deformable statistical shape and intensity model (SSIM) to the X-rays. The relative positioning between femur and implant is then assessed in terms of the displacement between the reconstructed 3D shape of the femur and the plate. We believe that the approach presented in this paper constitutes a meaningful tool to elucidate the effect of implant positioning on fracture healing and, ultimately, to derive load recommendations after surgery.</abstract>
    <identifier type="issn">1438-0064</identifier>
    <identifier type="urn">urn:nbn:de:0297-zib-56217</identifier>
    <author>Moritz Ehlke</author>
    <submitter>Moritz Ehlke</submitter>
    <author>Mark Heyland</author>
    <author>Sven Märdian</author>
    <author>Georg Duda</author>
    <author>Stefan Zachow</author>
    <series>
      <title>ZIB-Report</title>
      <number>15-47</number>
    </series>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>3d-reconstruction from 2d X-rays</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>statistical shape and intensity models</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>osteosynthesis follow-up</value>
    </subject>
    <collection role="ccs" number="I.4.5">Reconstruction</collection>
    <collection role="msc" number="68-06">Proceedings, conferences, collections, etc.</collection>
    <collection role="institutes" number="vis">Visual Data Analysis</collection>
    <collection role="institutes" number="medplan">Therapy Planning</collection>
    <collection role="persons" number="ehlke">Ehlke, Moritz</collection>
    <collection role="persons" number="zachow">Zachow, Stefan</collection>
    <collection role="projects" number="BSRT-3DFromXray">BSRT-3DFromXray</collection>
    <collection role="projects" number="Trauma">Trauma</collection>
    <collection role="institutes" number="VDcC">Visual and Data-centric Computing</collection>
    <file>https://opus4.kobv.de/opus4-zib/files/5621/ZIBReport_15-47.pdf</file>
    <file>https://opus4.kobv.de/opus4-zib/files/5621/ZIBReport_15-47_REVISED.pdf</file>
    <file>https://opus4.kobv.de/opus4-zib/files/5621/ZIB-Report_rev2.pdf</file>
  </doc>
  <doc>
    <id>5426</id>
    <completedYear/>
    <publishedYear/>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>reportzib</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>2015-01-04</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Assessing the Relative Positioning of an Osteosynthesis Plate to the Patient-Specific Femoral Shape from Plain 2D Radiographs</title>
    <abstract language="eng">We  present  a   novel  method  to  derive  the surface distance of an osteosynthesis  plate w.r.t. the patient­specific  surface  of  the  distal  femur  based  on  2D  X­ray  images.  Our  goal  is  to  study from  clinical  data,  how  the  plate­to­bone  distance  affects  bone  healing.  The  patient­specific 3D  shape  of the femur is, however, seldom recorded for cases of femoral  osteosynthesis since this  typically  requires  Computed  Tomography  (CT),  which  comes  at  high  cost  and  radiation dose.  Our method instead utilizes two postoperative X­ray images to derive the femoral shape and  thus  can  be  applied  on  radiographs  that  are  taken  in  clinical  routine  for  follow­up.  First, the  implant  geometry  is  used  as  a  calibration  object  to  relate  the  implant  and  the  individual X­ray  images  spatially  in  a  virtual  X­ray  setup.  In  a  second step, the patient­specific femoral shape  and  pose  are reconstructed  in  the  virtual  setup  by  fitting  a deformable statistical shape and  intensity  model  (SSIM)  to  the  images.  The  relative  positioning  between  femur  and implant  is  then  assessed  in  terms  of  displacement  between  the  reconstructed  3D shape of the femur  and  the  plate.  A   preliminary  evaluation  based  on  4  cadaver  datasets  shows  that  the method  derives  the  plate­to­bone  distance  with  a  mean absolute error of less than 1mm and a maximum  error  of  4.7  mm  compared  to  ground  truth  from  CT. We believe that the approach presented  in  this  paper  constitutes  a  meaningful  tool  to  elucidate  the  effect  of  implant positioning on fracture healing.</abstract>
    <identifier type="issn">1438-0064</identifier>
    <identifier type="urn">urn:nbn:de:0297-zib-54268</identifier>
    <enrichment key="SourceTitle">Appeared in: Proceedings of the 15th Annual Meeting of CAOS-International (CAOS)</enrichment>
    <author>Moritz Ehlke</author>
    <submitter>Moritz Ehlke</submitter>
    <author>Mark Heyland</author>
    <author>Sven Märdian</author>
    <author>Georg Duda</author>
    <author>Stefan Zachow</author>
    <series>
      <title>ZIB-Report</title>
      <number>15-21</number>
    </series>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>3d-­reconstruction from 2d X­rays</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>statistical shape and intensity models</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>fracture fixation of the distal femur</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>pose estimation</value>
    </subject>
    <collection role="ccs" number="I.4.5">Reconstruction</collection>
    <collection role="ccs" number="">Health</collection>
    <collection role="msc" number="68-06">Proceedings, conferences, collections, etc.</collection>
    <collection role="institutes" number="vis">Visual Data Analysis</collection>
    <collection role="institutes" number="medplan">Therapy Planning</collection>
    <collection role="persons" number="ehlke">Ehlke, Moritz</collection>
    <collection role="persons" number="zachow">Zachow, Stefan</collection>
    <collection role="projects" number="BSRT-3DFromXray">BSRT-3DFromXray</collection>
    <collection role="projects" number="ECMath-CH8">ECMath-CH8</collection>
    <collection role="projects" number="Trauma">Trauma</collection>
    <collection role="institutes" number="VDcC">Visual and Data-centric Computing</collection>
    <file>https://opus4.kobv.de/opus4-zib/files/5426/ZIB-Report-15-21.pdf</file>
    <file>https://opus4.kobv.de/opus4-zib/files/5426/ZIBReport_15-21-REVISED.pdf</file>
  </doc>
  <doc>
    <id>5370</id>
    <completedYear/>
    <publishedYear/>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>reportzib</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>2015-02-13</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Towards Robust Measurement of Pelvic Parameters from AP Radiographs using Articulated 3D Models</title>
    <abstract language="eng">Patient-specific parameters such as the orientation of the acetabulum or pelvic tilt are useful for custom planning for total hip arthroplasty (THA) and for evaluating the outcome of surgical interventions. The gold standard in obtaining pelvic parameters is from three-dimensional (3D) computed tomography (CT) imaging. However, this adds time and cost, exposes the patient to a substantial radiation dose, and does not allow for imaging under load (e.g. while the patient is standing). If pelvic parameters could be reliably derived from the standard anteroposterior (AP) radiograph, preoperative planning would be more widespread, and research analyses could be applied to retrospective data, after a postoperative issue is discovered. The goal of this work is to enable robust measurement of two surgical parameters of interest: the tilt of the anterior pelvic plane (APP) and the orientation of the natural acetabulum. We present a computer-aided reconstruction method to determine the APP and natural acetabular orientation from a single, preoperative X-ray. It can easily be extended to obtain other important preoperative and postoperative parameters solely based on a single AP radiograph.</abstract>
    <identifier type="issn">1438-0064</identifier>
    <identifier type="urn">urn:nbn:de:0297-zib-53707</identifier>
    <enrichment key="SourceTitle">Appeared in: International Journal for Computer Assisted Radiology and Surgery (IJCARS)</enrichment>
    <author>Moritz Ehlke</author>
    <submitter>Moritz Ehlke</submitter>
    <author>Thomas Frenzel</author>
    <author>Heiko Ramm</author>
    <author>Mohsen Akbari Shandiz</author>
    <author>Carolyn Anglin</author>
    <author>Stefan Zachow</author>
    <series>
      <title>ZIB-Report</title>
      <number>15-11</number>
    </series>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Articulated Models, Statistical Shape And Intensity Models, 2D/3D Anatomy Reconstruction, Pelvic Parameters Measurement, Total Hip Arthroplasty</value>
    </subject>
    <collection role="institutes" number="vis">Visual Data Analysis</collection>
    <collection role="institutes" number="medplan">Therapy Planning</collection>
    <collection role="persons" number="ehlke">Ehlke, Moritz</collection>
    <collection role="persons" number="zachow">Zachow, Stefan</collection>
    <collection role="projects" number="BSRT-3DFromXray">BSRT-3DFromXray</collection>
    <collection role="projects" number="ECMath-CH8">ECMath-CH8</collection>
    <collection role="projects" number="PelViz">PelViz</collection>
    <collection role="institutes" number="VDcC">Visual and Data-centric Computing</collection>
    <file>https://opus4.kobv.de/opus4-zib/files/5370/ZIBReport-15-11.pdf</file>
  </doc>
</export-example>
