title: Performance of cone-beam computed tomography and multidetector computed tomography in diagnostic imaging of the midface: A comparative study on Phantom and cadaver head scans.
abstract: OBJECTIVE
  To compare multidetector computed tomography (MDCT) and cone-beam computed tomography (CBCT) regarding radiation, resolution, image noise, and image quality.
  
  
  METHODS
  CBCT and 256-MDCT were compared based on three scan protocols: Standard-dose (≈24 mGy), reduced-dose (≈9 mGy), and low-dose (≈4 mGy). MDCT images were acquired in standard- and high-resolution mode (HR-MDCT) and reconstructed using filtered back projection (FBP) and iterative reconstruction (IR). Spatial resolution in linepairs (lp) and objective image noise (OIN) were assessed using dedicated phantoms. Image quality was assessed in scans of 25 cadaver heads using a Likert scale.
  
  
  RESULTS
  OIN was markedly higher in FBP-MDCT when compared to CBCT. IR lowered the OIN to comparable values in standard-mode MDCT only. CBCT provided a resolution of 13 lp/cm at standard-dose and 11 lp/cm at reduced-dose vs. 11 lp/cm and 10 lp/cm in HR-MDCT. Resolution of 10 lp/cm was observed for both devices using low-dose settings. Quality scores of MDCT and CBCT did not differ at standard-dose (CBCT, 3.4; MDCT, 3.3-3.5; p > 0.05). Using reduced- and low-dose protocols, CBCT was superior (reduced-dose, 3.2 vs. 2.8; low dose, 3.0 vs. 2.3; p < 0.001).
  
  
  CONCLUSIONS
  Using the low-dose protocol, the assessed CBCT provided better objective and subjective image quality and equality in resolution. Similar image quality, but better resolution using CBCT was observed at higher exposure settings.
  
  
  CONCLUSIONS
  • The assessed CBCT device provided better image quality at lower doses. • Objective and subjective image quality were comparable using higher exposure settings. • CBCT showed superior spatial resolution in standard-dose and reduced-dose settings. • Modern noise-reducing tools are used in CBCT devices currently. • MDCT should be preferred for assessment of soft-tissue injuries and oncologic imaging.
authors.affiliation: Department of Diagnostic and Interventional Radiology, University Medical Center Hamburg, Martinistrasse 52, D-20246, Hamburg, Germany. veldhoen_s@ukw.de.|Department of Diagnostic and Interventional Radiology, University Hospital Würzburg, Oberdürrbacher Straße 6, D-97080, Würzburg, Germany. veldhoen_s@ukw.de.
authors.forename: Simon
authors.initials: S
authors.lastname: Veldhoen
authors.affiliation: Department of Oral- and Maxillofacial Surgery, University Medical Center Hamburg, Hamburg, Germany.
authors.forename: Maximilian
authors.initials: M
authors.lastname: Schöllchen
authors.affiliation: Department of Oral- and Maxillofacial Surgery, University Medical Center Hamburg, Hamburg, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Hanken
authors.affiliation: Department of Oral- and Maxillofacial Surgery, University Medical Center Hamburg, Hamburg, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Precht
authors.affiliation: Department of Diagnostic and Interventional Radiology, University Medical Center Hamburg, Martinistrasse 52, D-20246, Hamburg, Germany.
authors.forename: F O
authors.initials: FO
authors.lastname: Henes
authors.affiliation: Department of Medical Biometry and Epidemiology, University Medical Center Hamburg, Hamburg, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Schön
authors.affiliation: Science and Technology for Radiology, Buchholz, Germany.
authors.forename: H D
authors.initials: HD
authors.lastname: Nagel
authors.affiliation: Institute of Anatomy, University Medical Center Hamburg, Hamburg, Germany.
authors.forename: U
authors.initials: U
authors.lastname: Schumacher
authors.affiliation: Department of Oral- and Maxillofacial Surgery, University Medical Center Hamburg, Hamburg, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Heiland
authors.affiliation: Department of Diagnostic and Interventional Radiology, University Medical Center Hamburg, Martinistrasse 52, D-20246, Hamburg, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Adam
authors.affiliation: Department of Diagnostic and Interventional Radiology, University Medical Center Hamburg, Martinistrasse 52, D-20246, Hamburg, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Regier
mesh_terms: D002102:Cadaver; D054893:Cone-Beam Computed Tomography / Q000379:methods*; D005145:Face / Q000000981:diagnostic imaging*; D006257:Head / Q000000981:diagnostic imaging; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional; D061330:Multidetector Computed Tomography / Q000379:methods*; D019047:Phantoms, Imaging; D011446:Prospective Studies; D011829:Radiation Dosage; D011874:Radiometry
keywords: Cone-beam computed tomography; Multidetector computed tomography; Phantom imaging; Prospective study; Radiometry