title: [Examination of scanning technique for lung cancer screening with helical CT].
abstract: As a new application of helical CT scanning we evaluated the parameters for lung cancer screening with an extremely low doses and large helical pitch. On the phantom studies, the image quality obtained with the low dose parameter was not inferior to that of the usual screening technique but artifacts were increased with the large helical pitch. A scanning technique using 120 kv, 40-60mA, 10mmth, 20mm/ sec, and a reconstruction pitch of 2 was used for lung cancer screening (screening parameters) (50 cases), and comparison was made between the detectability of the screening parameters and the routine parameters (120 kv, 200mA, 10mmth, 10-13mm/sec, and a reconstruction pitch of 1-1.3). Detectability with the screening parameters was as follows: nodular lesions (< 5mm in size: 76%. 5-10mm: 90-93% 10mm < 100%), linear lesions: 94-95%, infiltrations: 93-100%. There were no false negative lesions, when the reconstruction pitch of the screening parameters was changed from 1 to 0.25. In conclusion, reconstruction pitch had the most influence on lesion detectability.
authors.affiliation: Department of Radiology, Showa University Fujigaoka Hospital.
authors.forename: M
authors.initials: M
authors.lastname: Obuchi
authors.forename: Y
authors.initials: Y
authors.lastname: Shen
authors.forename: J
authors.initials: J
authors.lastname: Nagashima
authors.forename: M
authors.initials: M
authors.lastname: Yamada
authors.forename: K
authors.initials: K
authors.lastname: Takizawa
authors.forename: M
authors.initials: M
authors.lastname: Honda
authors.forename: K
authors.initials: K
authors.lastname: Uchiyama
authors.forename: S
authors.initials: S
authors.lastname: Hasebe
authors.forename: H
authors.initials: H
authors.lastname: Shinohara
authors.forename: S
authors.initials: S
authors.lastname: Sato
authors.forename: M
authors.initials: M
authors.lastname: Shin
authors.forename: Y
authors.initials: Y
authors.lastname: Kuniyasu
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D008207:Lymphatic Metastasis; D008297:Male; D008400:Mass Chest X-Ray / Q000379:methods*; D008875:Middle Aged; D019047:Phantoms, Imaging; D014057:Tomography, X-Ray Computed / Q000379:methods*