Department of Physics, Iwate Medical University
Department of Nutritional Science, Faculty of Applied Bio-science, Tokyo University of Agriculture
Department of Cardiac Physiology, National Cardiovascular Center Research Institute
Electron Tube Division #2, Hamamatsu Photonics K.K.
Department of Neurosurgery, School of Medicine, Iwate Medical University
Department of Neurosurgery, School of Medicine, Iwate Medical University
Department of Microbiology, School of Medicine, Iwate Medical University
Department of Microbiology, School of Medicine, Iwate Medical University
Tohoku University Biomedical Engineering Research Organization
抄録(英)
The 100-μm-focus x-ray generator consists of a main controller for regulating the tube voltage and current and a tube unit with a high-voltage circuit and a fixed anode x-ray tube. The maximum tube voltage, current, and electric power were 105kV, 0.5mA, and 50W, respectively. Using a 3-mm-thick aluminum filter, the x-ray intensity was 26.0μGy/s at 1.0m from the source with a tube voltage of 60kV and a current of 0.50 mA. Because the peak photon energy was approximately 35keV using the filter with a tube voltage of 60kV, the bremsstrahlung x-rays were absorbed effectively by iodine-based contrast media with an iodine K-edge of 33.2keV. Enhanced angiography was achieved with a flat panel detector with a pixel size of 50μm using iodine-based microspheres 15μm in diameter. In angiography of non-living animals, we observed fine blood vessels of approximately 100gm with high contrasts.