Fumihiro Masaki

Learn More
Introduction: The observation of T2* heterogeneity in white matter at high magnetic field strength [1] has invited speculation that white matter fiber orientation with respect to the main magnetic field (B0) might contribute to this contrast. A possible mechanism is the orientation dependence of microscopic field distributions in oriented structures such as(More)
PURPOSE To investigate the feasibility of accurate breast tissue compositional characterization by using spectral-distortion-corrected dual energy images from a photon-counting spectral CT. METHODS Thirty eight postmortem breasts were imaged with a Cadmium-Zinc-Telluride (CZT)-based photon-counting spectral CT system at beam energy of 100 kVp. The(More)
PURPOSE To investigate the feasibility of microcalcification and soft tissue lesion detection using an energy-resolved photon-counting detector based on Si strips for breast spectral computed tomography (CT). METHODS Simulations and experiments were performed with a prototype spectral CT system equipped with a Si-based photon-counting detector with energy(More)
PURPOSE To determine the optimal design parameters for a high resolution spectral breast CT system based on an energy-resolved photon counting Si strip detector for breast imaging. METHODS A simulation package was developed for a spectral breast CT system. The focal spot size (100 to 300 μm), magnification (1.1 to 1.4), motion blurring and detector pixel(More)
IS RADIATION CARCINOGENESIS A STOCHASTIC PHENOMENON IN NATURE ? T a k e h i t o S A S A K I Department of Dental Radiology and Radiation Research, Facul ty of Dentistry, Tokyo Medical and Dental University Radiation carcinogenesis has been thought as a stochastic phenomenon without any threshold dose of radiation. Although this concept is very important,(More)
  • 1