Publications by authors named "Yusuke Matsuzawa"
Article Synopsis
- * The new method enhances mirror production by addressing issues like corrosion and thermal deformation, providing better stability and performance for high-quality x-ray optics.
- * A vacuum degassing technique was developed to reduce bubble pit formation during fabrication, resulting in the successful creation of three pit-free mirrors for the FOXSI-4 project, with precise accuracy and performance comparable to leading x-ray missions.
In this study, figure correction of a master mandrel of a Wolter mirror by organic abrasive machining (OAM) was demonstrated. In OAM, a flow of slurry, dispersed with organic particles, locally removes the surface of a workpiece in contact with a rotating machining tool. A computer-controlled machining system was used to perform the selective removal of a fused silica surface at a spatial resolution of 200 µm.
View Article and Find Full Text PDFA soft X-ray ptychography system using a Wolter mirror for the illumination optics has been developed. By taking advantage of the achromaticity of the optics, the system is capable of seamlessly imaging at half-period resolution of 50 nm with a broad photon-energy range from 250 eV to 2 keV while maintaining the focal position. Imaging a mammalian cell at various wavelengths was demonstrated, and high-resolution visualization of organelle was achieved.
View Article and Find Full Text PDFThis clinical report describes the immediate autograft of primary (milk) teeth-derived demineralized dentin matrix (DDM) granules for a 6-year-old boy with unilateral alveolar cleft. First, four primary teeth were extracted, crushed in an electric mill for 1 min, and the crushed granules were demineralized in 2% HNO solution for 20 min. Simultaneously, the nasal mucoperiosteum was pushed upwards above the apices of the permanent central incisor adjacent to the cleft.
View Article and Find Full Text PDFArticle Synopsis
- The Wolter mirror is a high-performance optical device designed for focusing soft x-rays to a very small spot size, with benefits like high efficiency and resilience against alignment errors.
- The study overcame challenges in creating this mirror by using tactile scanning measurements, which allowed for accurate surface characterization without damaging the mirror substrate.
- The final fabricated Wolter mirror showed minimal figure error, and simulations confirmed its ability to focus x-ray beams as expected, with experimental results validating the tactile measurement approach's effectiveness.
High-precision optics for short-wavelength regions, such as x rays and extreme ultraviolet light, generally require nanometer-level figure accuracy on their surfaces. Such optics are finished via a numerically controlled figure correction process in which the dwelling time of the machining tool on the workpiece is controlled. Due to the limitation of the machined spot size, it is difficult to remove mid-spatial-frequency (1 to 10 mm) errors on an optical surface.
View Article and Find Full Text PDFWe developed a full-field microscope with twin Wolter mirrors for soft X-ray free-electron lasers. The Wolter mirrors for a condenser and an objective were fabricated using an electroforming process with a precisely figured master mandrel. In the imaging system constructed at SACLA BL1, sub-micrometer spatial resolution was achieved at wavelengths of 10.
View Article and Find Full Text PDFSpecial AT-rich sequence-binding protein 2 (SATB2)-associated syndrome (SAS) is characterized by alterations of SATB2. Its clinical features include intellectual disability and craniofacial abnormalities, such as cleft palate, dysmorphic features, and dental abnormalities. Here, we describe three previously undiagnosed, unrelated patients with SAS who exhibited dental abnormalities, including multiple odontomas.
View Article and Find Full Text PDFArticle Synopsis
- Grazing incidence mirrors for X-rays are beneficial because they eliminate chromatic aberration and can focus efficiently.
- While there are existing nanofocusing mirrors for hard X-rays, soft X-ray mirrors with similar capabilities are lacking, particularly for focusing below 100 nm at energies under 1 keV.
- This study presents a new fabrication process for ellipsoidal mirrors, which achieved a focus size of under 250 nm at 300 eV, showing potential for advanced X-ray mirror designs, including Wolter mirrors.
Objective: To compare dental arch relationship outcomes following one- and two-stage palatal repair.
Design: Nonrandomized, clinical trial with concurrent control.
Setting: Hokkaido University Hospital.
Monocortical mandibular bone grafting for reconstruction of alveolar cleft.
Cleft Palate Craniofac J
September 2010
Objective: To assess and develop a monocortical mandibular bone grafting procedure for reconstruction of alveolar cleft.
Design: Prospective study.
Setting: Hokkaido University Hospital.
Orbital wall reconstruction with bone grafts from the outer cortex of the mandible.
J Craniomaxillofac Surg
December 2004
Aim: The purpose of the study was to assess the efficacy of bone grafting from the mandibular outer cortex for reconstructing the orbital walls.
Material And Methods: Bone grafting was performed in 75 patients. The site the transplants were harvested from were: A: mental region, B: area posterior to the mental foramen, C: ramus region.