title: Low Dose Computed Tomography for 3D Planning of Total Hip Arthroplasty: Evaluation of Radiation Exposure and Image Quality.
abstract: OBJECTIVE
  The aim of the study was to compare radiation exposure and image quality between dedicated computed tomography (CT) protocols for preoperative total hip arthroplasty (THA) planning.
  
  
  METHODS
  Three protocols with automated tube current modulation using 64-slice (n = 177) and 128-slice CT scanners without (n = 129) and with automated tube voltage preselection (n = 84) were compared.
  
  
  RESULTS
  All 390 CTs were of sufficient quality for THA planning. Mean DLP was 235.0 mGy*cm (effective dose 2.8 mSv). Lowest radiation exposure (2.5 mSv) was seen with automated voltage preselection and the algorithm's selection was 100 kV (90.5% of patients) and 120 kV. Lowest image noise was seen in the highest dose group (3.1 mSv, 128-slice CT fixed tube voltage). A significant difference in cortical bone radiodensity was seen between 100 kV and 120 kV (P < 0.0001).
  
  
  CONCLUSIONS
  Preoperative pelvic CT for THA planning is possible with very low radiation dose and reliable quality. Automated voltage preselection further decreases the effective dose by 18.2%.
authors.affiliation: From the *Department of Radiology, Klinikum Ernst von Bergmann, Potsdam; †Department of Radiology, Charité-Universitätsmedizin Berlin, Berlin, Germany; ‡Department of Orthopaedic Surgery, Hôpital Pitié Salpétrière, Paris, France; §Scossis Statistical Consulting; and ∥Orthopaedic Surgery, Proendo, Berlin, Germany.
authors.forename: Alexander
authors.initials: A
authors.lastname: Huppertz
authors.forename: Alexander
authors.initials: A
authors.lastname: Lembcke
authors.forename: El-Hadi
authors.initials: el-H
authors.lastname: Sariali
authors.forename: Tahir
authors.initials: T
authors.lastname: Durmus
authors.forename: Carsten
authors.initials: C
authors.lastname: Schwenke
authors.forename: Bernd
authors.initials: B
authors.lastname: Hamm
authors.forename: Martin
authors.initials: M
authors.lastname: Sparmann
authors.forename: Alexander D J
authors.initials: AD
authors.lastname: Baur
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D008875:Middle Aged; D011829:Radiation Dosage; D000069079:Radiation Exposure / Q000706:statistics & numerical data*; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*