A global lunar topographic map with a spatial resolution of finer than 0.5 degree has been derived using data from the laser altimeter (LALT) on board the Japanese lunar explorer Selenological and Engineering Explorer (SELENE or Kaguya). In comparison with the previous Unified Lunar Control Network (ULCN 2005) model, the new map reveals unbiased lunar… (More)
The absolute reflectance of the Moon has long been debated because it has been suggested (Hillier et al. in Icarus 151:205–225, 1999) that there is a large discrepancy be-58 M. Ohtake et al. tween the absolute reflectance of the Moon derived from Earth-based telescopic data and that derived from remote-sensing data which are calibrated using… (More)
BACKGROUND Computed tomography (CT) is the largest source of medical radiation exposure to the general population, and is considered a potential source of increased cancer risk. The aim of this study was to assess the current situation of CT use in Japan, and to investigate variations in radiation exposure in CT studies among institutions and scanners. … (More)
Introduction: The laser altimeter (LALT) onboard Japanese lunar explorer KAGUYA (SELENE) launched on 14 September, 2007 from Tanegashima Space Center (JAXA) is designed to perform the topography of the Moon from the altitude of 100 km . LALT transmits Cr doped Nd:YAG laser pulses at 1 Hz to measure the distance from the spacecraft to the surface of the… (More)
OBJECTIVE The objective of this study was to assess differences in the semiquantitative values of 18F-fluorodeoxyglucose (18F-FDG) uptake among different positron emission tomographic (PET) systems. METHODS A phantom study was performed to compare standardized uptake value (SUV) in five PET scanners including a dedicated PET scanner and four PET/computed… (More)
PURPOSE The purpose of our study is the establishment of normal database (NDB) from persons (aged 50-80 years) for 3D-SSP analysis of 123I-IMP brain perfusion SPECT image, and we analyzed whether the presence or absence of image correction methods, scatter correction (SC) and attenuation correction (AC), affects the created NDB and 3D-SSP analysis. … (More)
Tc-99m HMPAO brain SPECT study incidentally demonstrated a large area of increased accumulation in the soft tissue of the face and fronto-parietal region of the head, corresponding to the distribution of the ophthalmic and maxillary branches of the trigeminal nerve, which had been infected by herpes zoster.