title: Dose evaluation for foetal computed tomography with a 320-row unit in wide-volume mode and an 80-row unit in helical scanning mode: a phantom study.
abstract: The purpose of this study was to evaluate the maternal and foetal effective doses during foetal computed tomography (CT) and to compare the radiation dose, dose profile and image noise on 80-row CT in helical scanning mode and 320-row CT in wide-volume scanning mode. The radiation doses were measured using thermoluminescent dosemeters implanted at various organ sites of an anthropomorphic pregnant phantom. The foetal doses in the 320-row multi-detector CT (MDCT) and 80-row MDCT units were higher than the volume CT dose index (CTDIvol). The dose profile in the 320-row MDCT overlapped in two places but showed no overlap in the 80-row MDCT. There were no significant differences in image noise between the two scanning modes. The foetal dose evaluation by CTDIvol may underestimate the foetal radiation risk. When using the wide-volume mode, operators must take into account the number of scans and overlap between volumetric sections.
authors.affiliation: Department of Imaging, Nagoya Kyoritsu Hospital, 1-172, Hokke, Nakagawa-ku, Nagoya, Aichi 454-0933, Japan Graduate School of Medicine, Tohoku University, 2-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8575, Japan frankie217612@gmail.com.
authors.forename: Yuta
authors.initials: Y
authors.lastname: Matsunaga
authors.affiliation: Department of Radiology, Toyota Memorial Hospital, Toyota 471-0821, Japan Graduate School of Medicine, Tohoku University, 2-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8575, Japan.
authors.forename: Ai
authors.initials: A
authors.lastname: Kawaguchi
authors.affiliation: School of Health Sciences, Fujita Health University, Toyoake 470-1192, Japan.
authors.forename: Masanao
authors.initials: M
authors.lastname: Kobayashi
authors.affiliation: Department of Radiology, School of Medicine, Fujita Health University, Toyoake 470-1192, Japan.
authors.forename: Shigetaka
authors.initials: S
authors.lastname: Suzuki
authors.affiliation: School of Health Sciences, Fujita Health University, Toyoake 470-1192, Japan.
authors.forename: Shoichi
authors.initials: S
authors.lastname: Suzuki
authors.affiliation: Graduate School of Medicine, Tohoku University, 2-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8575, Japan.
authors.forename: Koichi
authors.initials: K
authors.lastname: Chida
mesh_terms: D001822:Body Burden; D005260:Female; D005333:Fetus / Q000000981:diagnostic imaging*; D006801:Humans; D019047:Phantoms, Imaging; D011247:Pregnancy; D011829:Radiation Dosage; D036542:Tomography, Spiral Computed / Q000379:methods*