title: Effect of size of region of interest on precision of bone mineral measurements of the mandible by quantitative computed tomography.
abstract: The effect of size and shape of the region of interest (ROI) on the precision of the measurements of bone mineral content of mandibular bone by quantitative computed tomography (QCT) has been studied. A dry mandible and a series of calcium carbonate rods (density: 119.6 mg cm-3, 461.2 mg cm-3 and 939.0 mg cm-3) were used. The precision of measurements of the ROI for sizes less than 1 cm2 was very low, but the shape did not have any influence on the precision if the material examined was either homogeneous or if it was heterogeneous from always the same area. Higher precision was found when the ROI was more than 1 cm2. The size of ROI is a critical factor in the measurement of bone mineral content in the mandible by QCT.
authors.affiliation: Department of Oral Radiology, Hiroshima University School of Dentistry, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Taguchi
authors.forename: K
authors.initials: K
authors.lastname: Tanimoto
authors.forename: M
authors.initials: M
authors.lastname: Ogawa
authors.forename: T
authors.initials: T
authors.lastname: Sunayashiki
authors.forename: T
authors.initials: T
authors.lastname: Wada
mesh_terms: D015519:Bone Density; D002119:Calcium Carbonate / Q000032:analysis; D006801:Humans; D008334:Mandible / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed
chemical_list: D002119:Calcium Carbonate