Kiyoaki Tanaka

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OBJECT In this study the authors examined how to differentiate radiation necrosis from recurrent metastatic brain tumor following stereotactic radiosurgery by using positron emission tomography (PET) with L-[methyl-11C]methionine (MET). METHODS In 21 adult patients with suspected recurrent metastatic brain tumor or radiation injury, MET-PET scans were(More)
OBJECT Following stereotactic radiosurgery (SRS), we examined how to differentiate radiation necrosis from recurrent malignant glioma using positron emission tomography (PET) with 11C-methionine (Met). METHODS Met-PET scans were obtained from 11 adult cases of recurrent malignant glioma or radiation injury, suspected on the basis of magnetic resonance(More)
OBJECT Functional hemispherectomy, itself a modification of anatomical hemispherectomy, has been further modified to a less invasive method (hemispherotomy), in which cortical resection is minimized and the rest of the affected hemisphere is functionally isolated by transecting its projection and commissural fibers. Although descriptions of three different(More)
The crystal structure of mayenite (12CaO·7Al(2)O(3)) has been investigated by single-crystal synchrotron diffraction with high resolution and accuracy, using a four-circle diffractometer equipped with an avalanche photodiode detector (APD) detector installed at PF14A in Tsukuba, Japan. Analysis revealed random displacements of ions by the electrostatic(More)
The scattering unit of X-ray crystal structure analysis is changed from atoms to the subshell electrons by X-ray atomic orbital analysis (XAO). All the atoms in the unit cell are divided into groups of subshell electrons in the XAO analysis. Each subshell is treated as an independent pseudo-atom, which enables the atomic orbitals (AO's) and the electron(More)
X-ray atomic orbital (XAO) analysis revealed that at both temperatures the electrons are transferred from B 2p(x)(= p(y)) to Ce 5d and 4f orbitals. At 340 K 5d(j = 5/2)Gamma(8) orbitals are occupied partially, but 4f(j = 5/2)Gamma(8) orbitals are more populated than 4f(j = 5/2)Gamma(7) orbitals, in contrast to our observation at 430 K [Makita et al. (2007).(More)
Electron density distributions (EDD) in CeB(6) were measured by X-ray diffraction at 100, 165, 230 and 298 K. Analysis with a weak-field model, in which the spin-orbit interaction dominates the energy splitting of the 4f levels, revealed that more 4f electrons were donated from Ce to B(6) at the lower temperature. Donated electrons localize around the B-B(More)
Accurate electron-density measurement of SmB(6) at 100, 165, 230 and 298 K, and X-ray atomic orbital (XAO) analysis were carried out. The 4f-electron density around Sm and 5d electron density at approximately 1 A from Sm were analysed by XAO analysis. The 5d electron density is due to the electrons of the 5d(J = 5/2)Gamma(8) orbitals which stem from the(More)
A topological analysis of the experimental electron density in racemic ethylenebis(1-indenyl)zirconium dichloride, C20H16Cl2Zr, measured at 100 (1) K, has been performed. The atomic charges calculated by the numerical integration of the electron density over the zero-flux atomic basins demonstrate the charge transfer of 2.25 e from the Zr atom to the two(More)
The crystal structure of EuRu(4)P(12) is isotypic with filled skutterudite structures of rare earth transition metal poly-phosphides: RFe(4)P(12) (R = Ce, Pr, Nd, Sm and Eu), RRu(4)P(12) (R = La, Ce, Pr and Nd) and ROs(4)P(12) (R = La, Ce, Pr and Nd). The Ru cation is coordinated by six P anions in a distorted octa-hedral manner. The partially occupied Eu(More)