Zobrazeno 1 - 10
of 42
pro vyhledávání: '"Kuniharu Imai"'
Autor:
Kuniharu Imai, Mitsuru Ikeda, Yoshiki Satoh, Keisuke Fujii, Chiyo Kawaura, Takuya Nishimoto, Masaki Mori
Publikováno v:
European Journal of Radiology Open, Vol 5, Iss , Pp 183-188 (2018)
Purpose: To investigate the contrast enhancement in DSA images based on the X-ray absorption characteristics of iodinated contrast media. Methods: We have derived a new formula of predicting the pixel value ratio of two different contrast media and d
Externí odkaz:
https://doaj.org/article/8bcd76280f4843e1a7c92dadbc1930d9
Autor:
Shiori Niwa, Fumiya Hisano, Ayana Mawaki, Keisuke Nakanishi, Sachiyo Watanabe, Atsushi Fukuyama, Toyone Kikumori, Kazuhiro Shimamoto, Kuniharu Imai, Etsuko Fujimoto, Chika Oshima
Publikováno v:
Lymphatic Research and Biology.
Autor:
Kuniharu Imai, Kento Takeda, Keisuke Fujii, Chiyo Kawaura, Takuya Nishimoto, Masaki Mori, Yuki Yamamoto, Takashi Izumi
Publikováno v:
Journal of Neuroendovascular Therapy. 16:586-592
Autor:
Mitsuru Ikeda, Keisuke Fujii, Kuniharu Imai, K. Narai, Chiyo Yamauchi-Kawaura, H Shimizu, M Yamauchi
Publikováno v:
Radiation Protection Dosimetry. 188:65-72
The aim of this study was to develop a head–chest phantom that could mimic the physique of a Japanese 0.5-year-old child and to investigate the current status of exposure dose in infant head computed tomography examinations in Japan. The phantom wa
Publikováno v:
J Digit Imaging
This study aims to devise a simple method for evaluating the magnitude of texture noise (apparent noise) observed on computed tomography (CT) images scanned at a low radiation dose and reconstructed using iterative reconstruction (IR) and deep learni
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::746bc1cd2630de812925ae7cb2a4bc0c
https://europepmc.org/articles/PMC8854541/
https://europepmc.org/articles/PMC8854541/
Publikováno v:
Radiation protection dosimetry. 196(1-2)
In this study, a method for estimating the half-value layer (HVL) and effective energy (Eeff) by imaging the luminescence from a polyethersulfone (PES) resin with rotating irradiation of X-rays in a computed tomography scanner was developed. The lumi
Autor:
Chiyo Kawaura, Yoshiki Satoh, Masaki Mori, Keisuke Fujii, Takuya Nishimoto, Mitsuru Ikeda, Kuniharu Imai
Publikováno v:
European Journal of Radiology Open
European Journal of Radiology Open, Vol 5, Iss, Pp 183-188 (2018)
European Journal of Radiology Open, Vol 5, Iss, Pp 183-188 (2018)
Highlights • We derived a new formula for comparing the contrast enhancement efficacy. • Theoretical value agrees with actual value for each combination of contrast media. • The contrast enhancement is affected by molecular structure of contras
Autor:
Suguru Ueda, Takahiro Saika, Yoshifumi Ono, Shouta Hattori, Naomi Hashimoto, Kuniharu Imai, Shigetoshi Kitaguchi
Publikováno v:
Japanese Journal of Radiological Technology. 72:402-409
It is well-known that metal artifacts have a harmful effect on the image quality of computed tomography (CT) images. However, the physical property remains still unknown. In this study, we investigated the relationship between metal artifacts and tub
Autor:
Yukihiro Enchi, Masaki Mori, Ikuko Takase, Mitsuru Ikeda, Kuniharu Imai, Chiyo Yamauchi-Kawaura
Publikováno v:
International Journal of Computer Assisted Radiology and Surgery. 10:1-10
Arterial contour extraction is essential for visualization and analysis of vasculature in CT angiography (CTA). A means for evaluating the detectability of artery contours CTA images is required. We developed and tested a new method for this purpose
Autor:
Kuniharu Imai, Kazuo Yoneda, Youko Iida, Mitsuru Ikeda, Masaki Mori, Yukihiro Enchi, Fukiko Ito
Publikováno v:
Electronics and Communications in Japan. 96:32-41
Summary One of the physical indices for evaluating the image quality of digital radiography is the contrast-to-noise ratio (CNR). The CNR was reported to simulate human perception. Thus, the CNR is a variable index for evaluating detectability in dig