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Kunii N, Kamada K, Ota T, Kawai K, Saito N. P18-22 The detailed analysis of fMRI in the frontal language area. A comparative study with electrocortical stimulation. Clin Neurophysiol 2010. [DOI: 10.1016/s1388-2457(10)60875-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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102
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Arikawa Y, Yamanoi K, Nakazato T, Estacio ES, Shimizu T, Sarukura N, Nakai M, Hosoda H, Norimatsu T, Hironaka Y, Azechi H, Izumi N, Murata T, Fujino S, Yoshida H, Kamada K, Usuki Y, Suyama T, Yoshikawa A, Satoh N, Kan H. Down-scattered neutron imaging detector for areal density measurement of inertial confinement fusion. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2010; 81:10D303. [PMID: 21033829 DOI: 10.1063/1.3475535] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A custom developed (6)Li glass scintillator (APLF80+3Pr) for down-scattered neutron diagnostics in inertial confinement fusion experiments is presented. (6)Li provides an enhanced sensitivity for down-scattered neutrons in DD fusion and its experimentally observed 5-6 ns response time fulfills the requirement for down-scattered neutron detectors. A time-of-flight detector operating in the current mode using the APLF80+3Pr was designed and its feasibility observing down-scattered neutrons was demonstrated. Furthermore, a prototype design for a down-scattered neutron imaging detector was also demonstrated. This material promises viability as a future down-scattered neutron detector for the National Ignition Facility.
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103
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Narita T, Takase M, Nishinaga T, Iyoda M, Kamada K, Ohta K. Star-Shaped Oligothiophenes with Unique Photophysical Properties and Nanostructured Polymorphs. Chemistry 2010; 16:12108-13. [DOI: 10.1002/chem.201001413] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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104
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Romero-Nieto C, Kamada K, Cramb DT, Merino S, Rodríguez-López J, Baumgartner T. Synthesis and Photophysical Properties of Donor-Acceptor Dithienophospholes. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000574] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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105
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Shioyama H, Kamada K. New method to evaluate the mobility of ions in the nanochannels of polymer electrolyte membranes. POLYMER SCIENCE SERIES A 2010. [DOI: 10.1134/s0965545x10070072] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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106
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Nagai H, Nakano M, Yoneda K, Kishi R, Takahashi H, Shimizu A, Kubo T, Kamada K, Ohta K, Botek E, Champagne B. Signature of multiradical character in second hyperpolarizabilities of rectangular graphene nanoflakes. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.03.013] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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107
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Kishi R, Bonness S, Yoneda K, Takahashi H, Nakano M, Botek E, Champagne B, Kubo T, Kamada K, Ohta K, Tsuneda T. Long-range corrected density functional theory study on static second hyperpolarizabilities of singlet diradical systems. J Chem Phys 2010; 132:094107. [PMID: 20210389 DOI: 10.1063/1.3332707] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
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108
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Morisue M, Ogawa K, Kamada K, Ohta K, Kobuke Y. Strong two-photon and three-photon absorptions in the antiparallel dimer of a porphyrin–phthalocyanine tandem. Chem Commun (Camb) 2010; 46:2121-3. [DOI: 10.1039/b921278g] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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109
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Houkin K, Nakayama N, Kamada K, Noujou T, Abe H, Kashiwaba T. Neuroprotective effect of the free radical scavenger MCI-186 in patients with cerebral infarction: clinical evaluation using magnetic resonance imaging and spectroscopy. J Stroke Cerebrovasc Dis 2009; 7:315-22. [PMID: 17895107 DOI: 10.1016/s1052-3057(98)80049-9] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/1997] [Accepted: 03/26/1998] [Indexed: 11/28/2022] Open
Abstract
A newly developed free radical scavenger, 3-methyl-1-phenyl-2-pyrazolin-5-one (MCI-186), holds promise for clinical application. We clinically evaluated the effect of MCI-186 on cerebral infarction by using magnetic resonance imaging (MRI) and proton MR spectroscopy (MRS). Six patients with large supratentorial infarction were evaluated with sequential MRI and proton MRS. These patients were also administered MCI-186 for 14 days after ischemic insult (MCI-186 group). The findings were compared with those for patients who had supratentorial infarctions equivalent in size to those in the MCI-186 group but who had received only conventional therapy. The course of change of the size of infarction was evaluated by MRI, and the metabolic changes following cerebral infarction were evaluated by proton MRS. As a result, there was no significant difference between the initial size of infarction in the conventionally treated group and that in the MCI-186 treated groups, nor did the groups show significant difference in the sequential changes depicted by MRI in the area of infarction, midline shift, or amount of edema. However, on MRS, the N-acetyl aspartate signal was significantly higher in the MCI-186 group than in the conventionally treated patients. In conclusion, MCI-186 has an effect of preservation of N-acetyl-aspartate, which is thought to be a neuronal marker, in cerebral infarction.
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110
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Murakami Y, Kakeda S, Kamada K, Ohnari N, Nishimura J, Ogawa M, Otsubo K, Morishita Y, Korogi Y. Effect of tube voltage on image quality in 64-section multidetector 3D CT angiography: Evaluation with a vascular phantom with superimposed bone skull structures. AJNR Am J Neuroradiol 2009; 31:620-5. [PMID: 19942711 DOI: 10.3174/ajnr.a1871] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
BACKGROUND AND PURPOSE Optimal tube voltage and tube current settings are not well established. The purpose of our study was to investigate the image quality on 3D CT angiograms of the brain at various kilovoltage settings by evaluating the depiction of simulated intracranial lesions by using a vascular phantom. MATERIALS AND METHODS An anthropomorphic vascular phantom with superimposed bone skull structures was designed to simulate various intracranial aneurysms with aneurysmal blebs. We performed CT angiography by using a 64-detector row CT scanner for various effective tube currents with 4 tube voltages of 80, 100, 120, and 135 kV(p). Simulated aneurysm enhancement and image noise were quantified; SNR and CNR were calculated. The depiction of the simulated aneurysms and blebs on 3D CT angiograms obtained with the volume-rendering technique was subjectively assessed. The effective dose was calculated on the basis of a CTDIw. The results of several protocols were compared by using the Student t test. RESULTS At identical doses levels (CTDIw), the mean SNR and CNR at 100 kV(p) were significantly higher than those at 80, 120, and 135 kV(p); and the mean qualitative image score at 100 kV(p) was significantly superior to those at 80 and 135 kV(p). CONCLUSIONS Our phantom study suggests that the tube voltage of 100 kV(p) is desirable for cerebral 3D CT angiograms, and the higher or lower kilovoltage settings may result in the degradation in diagnostic image quality.
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111
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Yoneda K, Nakano M, Kishi R, Takahashi H, Shimizu A, Kubo T, Kamada K, Ohta K, Champagne B, Botek E. Third-order nonlinear optical properties of trigonal, rhombic and bow-tie graphene nanoflakes with strong structural dependence of diradical character. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.09.047] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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112
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Kubota K, Takahashi H, Fukui H, Bonness S, Yoneda K, Kishi R, Kubo T, Kamada K, Ohta K, Champagne B, Botek E, Nakano M. Erratum to ‘Electron donor solvent effects on the (hyepr)polarizabilities of a singlet diradical molecule involving a boron atom’ [Chem. Phys. Lett. 477 (2009) 309]. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.08.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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113
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Kubota K, Takahashi H, Fukui H, Bonness S, Yoneda K, Kishi R, Kubo T, Kamada K, Ohta K, Champagne B, Botek E, Nakano M. Electron donor solvent effects on the (hyper)polarizabilities of a singlet diradical molecule involving a boron atom. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.07.022] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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114
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Gavrilyuk S, Liu JC, Kamada K, Ågren H, Gel’mukhanov F. Optical limiting for microsecond pulses. J Chem Phys 2009; 130:054114. [DOI: 10.1063/1.3072560] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
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115
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Kamada K, Yoshimura S, Murata M, Murata H, Nagai H, Ushio H, Terada K. Characterization and monitoring of pseudo-polymorphs in manufacturing process by NIR. Int J Pharm 2009; 368:103-8. [DOI: 10.1016/j.ijpharm.2008.10.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2008] [Accepted: 10/02/2008] [Indexed: 10/21/2022]
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116
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Agou T, Hossain MD, Kawashima T, Kamada K, Ohta K. Two-photon absorption properties of heterafluorenes and spirobiheterafluorenes bearing aminostyryl arms. Chem Commun (Camb) 2009:6762-4. [DOI: 10.1039/b912745c] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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117
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Murata T, Saito G, Nishimura K, Chong CH, Makihara M, Honda G, Enomoto Y, Khasanov S, Yamochi H, Otsuka A, Kamada K, Ohta K, Kawamata J. Crystal Structures, Degree of Charge Transfer, and Non-Linear Optical Characteristics of Intramolecular Charge-Transfer Compounds: Indoline-Substituted Tricyanoquinodimethanes. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2008. [DOI: 10.1246/bcsj.81.1131] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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118
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Fukui H, Kishi R, Minami T, Nagai H, Takahashi H, Kubo T, Kamada K, Ohta K, Champagne B, Botek E, Nakano M. Theoretical Study on Second Hyperpolarizabilities of Singlet Diradical Square Planar Nickel Complexes Involving o-Semiquinonato Type Ligands. J Phys Chem A 2008; 112:8423-9. [DOI: 10.1021/jp804400s] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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119
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Rahman MJ, Yamakawa J, Matsumoto A, Enozawa H, Nishinaga T, Kamada K, Iyoda M. Synthesis of Nonaphenylenes and Dodecaphenylenes Using Electron-Transfer Oxidation of Lipshutz Cuprates and Formation of Nanostructural Materials from Hexadodecyloxynonaphenylene. J Org Chem 2008; 73:5542-8. [DOI: 10.1021/jo800787u] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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120
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Hirakawa S, Kawamata J, Suzuki Y, Tani S, Murafuji T, Kasatani K, Antonov L, Kamada K, Ohta K. Two-Photon Absorption Properties of Azulenyl Compounds Having a Conjugated Ketone Backbone. J Phys Chem A 2008; 112:5198-207. [DOI: 10.1021/jp800415b] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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121
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Kakeda S, Korogi Y, Kamada K, Ohnari N, Moriya J, Sato T, Kitajima M, Hasnine H, Hirata N. Signal intensity of the motor cortex on phase-weighted imaging at 3T. AJNR Am J Neuroradiol 2008; 29:1171-5. [PMID: 18388220 DOI: 10.3174/ajnr.a1002] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE It is known that the motor cortex shows hypointensity on T2-weighted images in older patients. The goal of this study was to assess the signal intensity of the motor cortices on the phase-weighted imaging performed with a Windows-based software program that we developed ourselves. MATERIALS AND METHODS All studies were performed at 3T MR imaging. First, the TE for the phase-weighted image was optimized; the best contrast between the motor and other cortices was obtained with a TE of 40 ms. The study population consisted of 45 healthy subjects (23 females, 22 males; mean age, 32.1 years). The signal intensity of the motor cortices was divided into 3 grades by 2 neuroradiologists in comparison with that of the superior frontal cortex (SFC): In grade I, the motor cortex was isointense to the SFC; in grade II, the motor cortex was slightly hypointense to the SFC; and in grade III, the motor cortex was markedly hypointense to the SFC. RESULTS The motor cortex was classified as either grade II or III in all subjects older than 20 years of age on the phase-weighted images. Even at 10-19 years of age, the grade II or III appearance was found in 14 (88%) of 16 motor cortices (8 subjects) on the phase-weighted images. CONCLUSION In adolescents, the motor cortex is hypointense to other cerebral cortices on phase-weighted MR imaging, which probably reflects differences in the concentration of nonheme iron and/or in the tissue architecture.
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Dy J, Ogawa K, Kamada K, Ohta K, Kobuke Y. Stepwise elongation effect on the two-photon absorption of self-assembled butadiyne porphyrins. Chem Commun (Camb) 2008:3411-3. [DOI: 10.1039/b804056g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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123
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Ezaki Y, Nakashima K, Kamada K, Kaminogo M. Reversible widespread ischemia after early reperfusion detected by initial diffusion-weighted magnetic resonance imaging. ACTA ACUST UNITED AC 2007; 25:553-7. [DOI: 10.1007/s11604-007-0180-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2007] [Accepted: 07/25/2007] [Indexed: 10/22/2022]
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124
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Kamada K, Antonov L, Yamada S, Ohta K, Yoshimura T, Tahara K, Inaba A, Sonoda M, Tobe Y. Two-Photon Absorption Properties of Dehydrobenzo[12]annulenes and Hexakis(phenylethynyl)benzenes: Effect of Edge-Linkage. Chemphyschem 2007; 8:2671-7. [DOI: 10.1002/cphc.200700555] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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125
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Nakano M, Champagne B, Kubo T, Takahashi H, Takebe A, Nate M, Botek E, Kamada K, Kishi R, Ohta K. Second Hyperpolarizability of Zethrenes. ACTA ACUST UNITED AC 2007. [DOI: 10.1163/157404007782913435] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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