title: Radiation dose vs. image quality for low-dose CT protocols of the head for maxillofacial surgery and oral implant planning.
abstract: The goal of this study was to determine the acquisition parameters for a low-dose multi-slice CT protocol and to compare the effective dose and the image quality of this low-dose protocol with the image quality of a clinical multi-slice CT protocol, routinely used for visualisation of the head. The low-dose protocol was derived from a clinical multi-slice CT protocol by lowering mA s and kV and increasing the pitch. The low-dose protocol yielded a dose reduction from 1.5 to 0.18 mSv for a multi-slice CT scan of the whole head, whereas noise in the low-dose CT images was increased. For bone segmentation, noise could be reduced by use of a non-linear edge preserving smoothing filter. Tests on ESP and skull phantom indicated that the accuracy of the measurements on low-dose CT is acceptable for image-based planning of maxillofacial and oral implant surgery, reducing the dose by a factor of 8.
authors.affiliation: Medical Image Computing-ESAT/PSI, Hospital Gasthuisberg, Katholieke Universiteit Leuven, Herestraat 49, B-3000 Leuven, Belgium. Miet.Loubele@uz.kuleuven.ac.be
authors.forename: M
authors.initials: M
authors.lastname: Loubele
authors.forename: R
authors.initials: R
authors.lastname: Jacobs
authors.forename: F
authors.initials: F
authors.lastname: Maes
authors.forename: F
authors.initials: F
authors.lastname: Schutyser
authors.forename: D
authors.initials: D
authors.lastname: Debaveye
authors.forename: R
authors.initials: R
authors.lastname: Bogaerts
authors.forename: W
authors.initials: W
authors.lastname: Coudyzer
authors.forename: D
authors.initials: D
authors.lastname: Vandermeulen
authors.forename: J
authors.initials: J
authors.lastname: van Cleynenbreugel
authors.forename: G
authors.initials: G
authors.lastname: Marchal
authors.forename: P
authors.initials: P
authors.lastname: Suetens
mesh_terms: D006801:Humans; D019047:Phantoms, Imaging; D019736:Prostheses and Implants; D011829:Radiation Dosage; D011856:Radiographic Image Enhancement / Q000379:methods*; D011862:Radiography, Panoramic; D011874:Radiometry / Q000379:methods*; D012886:Skull / Q000000981:diagnostic imaging; D013515:Surgery, Oral / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*