title: An evaluation of the EOS X-ray imaging system in pelvimetry.
abstract: OBJECTIVE
  To demonstrate the reliability of the EOS imaging system in measuring the internal diameters of the bony pelvis.
  
  
  METHODS
  A prospective study comparing the results of the pelvimetry of 18 dry pelvises carried out on the EOS imaging system to measurements taken manually and using the two current gold standard CT methods. Pelvimetric measurements of each pelvic bone were obtained using four methods and compared: direct manual measurements, spiral and sequential CT pelvimetry, and 2D-3D low-dose biplanar X-rays. The various obstetric diameters were measured to the millimetre and compared.
  
  
  RESULTS
  There was no significant difference in the different diameters assessed, with the exception of the interspinous diameter. There was a highly significant correlation (P < 0.001) between the values measured manually and by EOS for the Magnin index (Pearson = 0.98), the obstetric conjugate diameter (Pearson = 0.99), and the median transverse diameter (Pearson = 0.87).
  
  
  CONCLUSIONS
  The EOS imaging system allows for an ex vivo determination of the obstetrical diameters that is reliable enough to estimate obstetric prognosis, producing comparable measurements to CT. In view of concerns about protection from radiation, this low-dose imaging technique could become, after in vivo prospective validation, the new gold standard for pelvimetry and therefore a good alternative to CT.
authors.affiliation: Department of Osteoarticular Imaging, Jean Minjoz Regional University Hospital, 3, boulevard Alexandre-Fleming, 25000 Besançon, France. Electronic address: marco.sigmann@wanadoo.fr.
authors.forename: M-H
authors.initials: MH
authors.lastname: Sigmann
authors.affiliation: Department of Gastrointestinal and Genitourinary Imaging, Jean Minjoz Regional University Hospital, 3, boulevard Alexandre-Fleming, 25000 Besançon, France; Laboratory of nanomedicine EA4662, University of Franche-Comté, Besançon, France.
authors.forename: E
authors.initials: E
authors.lastname: Delabrousse
authors.affiliation: Department of Obstetrics and Gynaecology, Jean Minjoz Regional University Hospital, 3, boulevard Alexandre-Fleming, 25000 Besançon, France.
authors.forename: D
authors.initials: D
authors.lastname: Riethmuller
authors.affiliation: Department of Osteoarticular Imaging, Jean Minjoz Regional University Hospital, 3, boulevard Alexandre-Fleming, 25000 Besançon, France.
authors.forename: M
authors.initials: M
authors.lastname: Runge
authors.affiliation: Department of Osteoarticular Imaging, Jean Minjoz Regional University Hospital, 3, boulevard Alexandre-Fleming, 25000 Besançon, France.
authors.forename: C
authors.initials: C
authors.lastname: Peyron
authors.affiliation: Department of Osteoarticular Imaging, Jean Minjoz Regional University Hospital, 3, boulevard Alexandre-Fleming, 25000 Besançon, France; Laboratory I4S. EA4268 IFR133, University of Franche-Comté, Besançon, France.
authors.forename: S
authors.initials: S
authors.lastname: Aubry
mesh_terms: D005260:Female; D005602:France; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000295:instrumentation; D010387:Pelvimetry / Q000295:instrumentation*; D019047:Phantoms, Imaging; D011247:Pregnancy; D011379:Prognosis; D011446:Prospective Studies; D011829:Radiation Dosage; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000295:instrumentation
keywords: CT; EOS; Low-dose; Obstetrics; Pelvimetry