Zobrazeno 1 - 10
of 105
pro vyhledávání: '"Hiroyasu Itoh"'
Autor:
Yusuke Inoue, Hiroyasu Itoh, Hirofumi Hata, Hiroki Miyatake, Kohei Mitsui, Shunichi Uehara, Chisaki Masuda
Publikováno v:
Tomography, Vol 10, Iss 12, Pp 2073-2086 (2024)
Objectives: We evaluated the noise reduction effects of deep learning reconstruction (DLR) and hybrid iterative reconstruction (HIR) in brain computed tomography (CT). Methods: CT images of a 16 cm dosimetry phantom, a head phantom, and the brains of
Externí odkaz:
https://doaj.org/article/b14aa7eaab9c4fb1b2e2ffcfd1bf4303
Autor:
Yusuke Inoue, Masahiro Mori, Hiroyasu Itoh, Kohei Mitsui, Hiroki Miyatake, Takuro Yamane, Hirofumi Hata
Publikováno v:
Tomography, Vol 10, Iss 1, Pp 14-24 (2023)
The effective dose (ED) in computed tomography (CT) may be calculated by multiplying the dose–length product (DLP) by a conversion factor. As children grow, automatic exposure control increases the DLP, while the conversion factor decreases; these
Externí odkaz:
https://doaj.org/article/a110674776bf4fac997b2c3817b1c8dd
Publikováno v:
Tomography, Vol 9, Iss 4, Pp 1381-1392 (2023)
We investigated the relationships between radiation dose indices and body size indices in adult body computed tomography (CT). A total of 3200 CT scans of the thoracic, abdominal, abdominopelvic, or thoraco-abdominopelvic regions performed using one
Externí odkaz:
https://doaj.org/article/11694236368f405e853046ebf21bd693
Autor:
Yusuke Inoue, Hiroyasu Itoh, Hiroki Miyatake, Hirofumi Hata, Ryosuke Sasa, Nao Shiibashi, Kohei Mitsui
Publikováno v:
Tomography, Vol 8, Iss 6, Pp 2929-2938 (2022)
We investigated the relationship between the head size and radiation dose in pediatric brain computed tomography (CT) to evaluate the validity of automatic exposure control (AEC). Phantom experiments were performed to assess image noise with and with
Externí odkaz:
https://doaj.org/article/d1898cca805547b7a13c096f830b28fa
Publikováno v:
Tomography, Vol 8, Iss 5, Pp 2486-2497 (2022)
Estimation of the standard radiation dose at each imaging facility is required for radiation dose management, including establishment and utilization of the diagnostic reference levels. We investigated methods to estimate the standard dose for pediat
Externí odkaz:
https://doaj.org/article/a420ff0bbf3247ee85df4c57119b90ae
Publikováno v:
Tomography, Vol 8, Iss 2, Pp 985-998 (2022)
The diagnostic reference levels (DRLs) for pediatric brain computed tomography (CT) are provided for groups divided according to age. We investigated the relationships of radiation dose indices (volume CT dose index and dose length product) with age
Externí odkaz:
https://doaj.org/article/ff1201bb98784a56ab22990e502048fb
Publikováno v:
Radiation Protection Dosimetry.
The size-specific dose estimate (SSDE) is used for radiation dose management in computed tomography (CT) and represents patient’s absorbed dose more accurately than volume CT dose index. The relationship between SSDE and age or weight was investiga
Autor:
Kazunori Nagahara, Hiroyasu Itoh, Yusuke Inoue, Koji Jinguji, Makoto Takano, Hirokazu Shimizu, Mizuho Adachi
Publikováno v:
Radiation Protection Dosimetry. 192:69-74
Radiation exposure in computed tomography (CT) is automatically modulated by automatic exposure control (AEC) mainly based on scout images. To simulate the whole-body positron emission tomography/CT, CT images of a phantom were obtained using the pos
Publikováno v:
Radiation Protection Dosimetry. 188:109-116
We performed phantom experiments to assess radiation dose in computed tomography (CT) venography of the lower extremities. CT images of a whole-body phantom were acquired using different automatic exposure control settings and scan ranges, simulating
Publikováno v:
Mitochondrion. 46:97-102
BCPP compounds have been developed as PET imaging probes for neurodegenerative diseases in the living brain. 18F-BCPP-EF identifies damaged neuronal areas based on the lack of MC-I; however, its underlying mechanisms of action and specificity for MC-