title: Volumetric tomography - a new tomographic technique for panoramic units.
abstract: OBJECTIVE
  To introduce a new three-dimensional dental imaging technique named volumetric tomography (VT).
  
  
  METHODS
  The new VT imaging method utilizes an iterative frequency-based reconstruction technique. With iterative algorithms each voxel value is defined multiple times during reconstruction. Computation time is therefore relatively lengthy. However, multicore processors and graphic board programming reduce the reconstruction time, making it possible to utilize this iterative reconstruction technique in clinical practice. The new VT technique is an add-on to a standard panoramic unit (Orthopantomograph OP 200 D; Instrumentarium Oy, Tuusula, Finland). Unit enhancements include a device for patient positioning and additional software. Preliminary clinical examinations have been performed.
  
  
  RESULTS
  Examinations demonstrated that the new VT technique gives satisfactory volumetric patient data from which tomographs may be derived for different clinical applications.
  
  
  CONCLUSIONS
  The new VT method may be employed when tomographic examinations are required for dental clinical work.
authors.affiliation: Department of Oral Radiology, Eastman Institute, Stockholm, Sweden. andreas.cederlund@socialstyrelsen.se
authors.forename: A
authors.initials: A
authors.lastname: Cederlund
authors.forename: M
authors.initials: M
authors.lastname: Kalke
authors.forename: U
authors.initials: U
authors.lastname: Welander
mesh_terms: D000465:Algorithms; D000539:Alveolar Process / Q000000981:diagnostic imaging; D019412:Anatomy, Cross-Sectional; D054893:Cone-Beam Computed Tomography / Q000379:methods*; D003481:Cuspid / Q000000981:diagnostic imaging; D015921:Dental Implants; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D021621:Imaging, Three-Dimensional / Q000379:methods; D007574:Jaw Relation Record / Q000295:instrumentation; D007575:Jaw, Edentulous / Q000000981:diagnostic imaging; D008334:Mandible / Q000000981:diagnostic imaging; D010347:Patient Care Planning; D011187:Posture; D011856:Radiographic Image Enhancement / Q000379:methods; D011861:Radiography, Dental / Q000379:methods*; D012984:Software; D013997:Time Factors; D014056:Tomography, X-Ray / Q000379:methods; D014095:Tooth, Impacted / Q000000981:diagnostic imaging
chemical_list: D015921:Dental Implants