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841 results on '"Watabe, H."'

103. Absence of tyrosine kinase mutations in Japanese colorectal cancer patients

Author

Shao, R-X, primary, Kato, N, additional, Lin, L-J, additional, Muroyama, R, additional, Moriyama, M, additional, Ikenoue, T, additional, Watabe, H, additional, Otsuka, M, additional, Guleng, B, additional, Ohta, M, additional, Tanaka, Y, additional, Kondo, S, additional, Dharel, N, additional, Chang, J-H, additional, Yoshida, H, additional, Kawabe, T, additional, and Omata, M, additional

Published
2006
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116. Development of a phoswich detector for a continuous blood-sampling system

Author

Yamamoto, S., Tarutani, K., Suga, M., Minato, K., Watabe, H., and Iida, H.

Subjects
Gamma rays -- Usage, Positrons -- Emission, Chemical detectors -- Design and construction, Blood -- Analysis and chemistry, Business, Electronics, Electronics and electrical industries
Abstract

We have developed a phoswich detector composed of a plastic scintillator and a BGO scintillator for a continuous blood-sampling system. The beta particle (positron) from the tube is detected by the plastic scintillator and emits 511-keV gamma photons. The BGO scintillator that is optically coupled to the plastic scintillator detects one of the gamma photons. Since the decay time of the plastic scintillator and the BGO are very different, it is possible to discriminate true (beta + gamma) events from background gamma events. First, the pulse height and pulse shape of plastic scintillator for beta particles and BGO scintillator for 511-keV gamma photons were measured and compared to estimate the possibility of the proposed method. Second, the proposed phoswich detector was fabricated and tested. Absolute sensitivity for Ga-68 (maximum energy of 1.90 MeV) and F-18 (maximum energy of 633 keV) positrons was measured and compared with conventional beta detector of similar size. The absolute sensitivity of the developed detector was 0.15 counts/Bq for Ga-68 positrons at the center of the detector. This was approximately five times higher in sensitivity than the conventional beta detector. The absolute sensitivity of the developed detector for F-18 positrons was 0.017 counts/Bq. The count rate of the developed detector was linear up to 10 kcps. The background count rate was small. These results indicate that the developed detector is useful not only for higher energy positrons such as O-15 but also for lower energy positrons such as F-18 or C-11. Index Terms--Continuous blood sampling, gamma photon, phoswich detector, positron.

Published
2001

120. 94106829 A clinical study on memory function in climacteric and periclimacteric women

Author

K. Mitsuya, H. Enomoto, Y. Yaoi, M. Hayashi, Watabe H, Segawa Y, Takeyoshi Ohkura, and K. Isse

Subjects
Clinical study, Pediatrics, medicine.medical_specialty, business.industry, media_common.quotation_subject, medicine, Obstetrics and Gynecology, Climacteric, Function (engineering), business, General Biochemistry, Genetics and Molecular Biology, media_common
Published
1994

144. Clinical usefulness of curve MPR

Author

Inamoto, N., primary, Ike, K., additional, Nakayasu, N., additional, Watabe, H., additional, Ishii, Y., additional, Nishida, M., additional, and Tanabe, M., additional

Published
1995
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