title: [A study of the minimum number of slices required for quantification of pulmonary emphysema by computed tomography].
abstract: We attempted to determine the minimum number of slices required for quantification of overall emphysema by computed tomography (CT). Forty-nine patients underwent CT scanning with a 15-mm slice interval, and 13 to 18 slices per patient were obtained. The percentage of low attenuation area (LAA%) per slice was measured with a method that we reported on previously, utilizing a CT program and NIH image. The average LAA% values for 1, 2, 3, and 6 slices evenly spaced through the lungs [LAA% (1), LAA% (2), LAA% (3), and LAA% (6)] were compared with those for all slices [LAA% (All)]. The correlation coefficients for LAA% (1), LAA% (2), LAA% (3), and LAA% (6) with LAA% (All) were 0.961, 0.981, 0.993, and 0.997, respectively. Mean differences +/- SD were -3.20 +/- 4.21%, -2.32 +/- 3.00, -0.20 +/- 1.84, and -0.16 +/- 1.26, respectively. From these results, we concluded that overall emphysema can be quantified by using at least three slices: one each of the upper, middle, and lower lung.
authors.affiliation: Third Department of Internal Medicine, Faculty of Medicine, Tottori University, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Hitsuda
authors.forename: Y
authors.initials: Y
authors.lastname: Kawasaki
authors.forename: T
authors.initials: T
authors.lastname: Igishi
authors.forename: K
authors.initials: K
authors.lastname: Yasuda
authors.forename: K
authors.initials: K
authors.lastname: Kato
authors.forename: S
authors.initials: S
authors.lastname: Matsumoto
authors.forename: M
authors.initials: M
authors.lastname: Nakamoto
authors.forename: K
authors.initials: K
authors.lastname: Hashimoto
authors.forename: Y
authors.initials: Y
authors.lastname: Fujii
authors.forename: M
authors.initials: M
authors.lastname: Miyata
authors.forename: T
authors.initials: T
authors.lastname: Sasaki
authors.forename: E
authors.initials: E
authors.lastname: Shimizu
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D011656:Pulmonary Emphysema / Q000000981:diagnostic imaging* / Q000473:pathology; D014057:Tomography, X-Ray Computed / Q000379:methods*