Yoshikazu Nomura

Learn More
OBJECTIVES The aim of this study was to investigate whether it was possible to evaluate bone mineral density (BMD) using voxel values from cone-beam CT (CBCT) for dental use. MATERIALS AND METHODS A water phantom with an aluminum rod and sample tubes containing iodine solutions of various concentration was imaged by CBCT and multi-slice CT (MSCT). Voxel(More)
OBJECTIVES The objective of this study was to investigate the stability of voxel values from cone-beam CT (CBCT) using a flat panel detector in changing surrounding circumstances mimicking clinical situations. MATERIALS AND METHODS Seven hydroxyapatite (HA) rods (0, 40, 80, 120, 160, 199, and 239 mg Ca/cm(3) ) were set in a 16 cm diameter water phantom(More)
A side- or oblique-viewing needle otoscope was used for the endoscopic examination of the middle ear. The needle otoscope consists of a Selfoc glass rod lens for observation and a bundle of glass fibers for illumination. Prisms attached at the tip of the lens and the glass fiber bundle facilitate the examination of 90 degrees lateral and 60 degrees oblique(More)
The aim of this study was to reveal the three-dimensional fluctuation of voxel values in a uniform material placed inside a phantom simulating a human head when it was scanned with cone-beam computed tomography (CBCT) for dental use. We employed a cylindrical acrylic phantom to simulate a human head. Iodine solution, water, or air was placed inside the(More)
PURPOSE To evaluate whether the measurement accuracy of dental CT images is affected by the mandibular positioning and the pitch factor at CT scanning. MATERIALS AND METHODS Three dry mandibles were scanned by 64-slice multidetector row CT (MDCT) and micro-CT. For MDCT scanning, 7 different mandibular positioning and 3 different pitch factors were(More)
OBJECTIVE This study evaluates the spatial resolution of cone beam computed tomography for dental use (CBCT) via modulation transfer function (MTF) analyses. STUDY DESIGN Two models of CBCT system, 3DX FPD8 and FineCube v.12, were used. MTF analysis was applied to each CBCT system using a thin tungsten wire technique. RESULTS The MTF curves in the(More)
OBJECTIVE To evaluate the visibility of the superior and inferior borders of mandibular canal using panoramic radiography (PR) and cross-sectional computed tomography (CT) images. STUDY DESIGN Digital panoramic images and cross-sectional CT images of 100 patients were evaluated. The mandibular canal was divided into 4 areas of equal width (1-4), from(More)
A new cone-beam computed tomography (CBCT) system called FineCube has been developed by Yoshida Dental Mfg. Co., Ltd. This CBCT system for dental use has a unique mechanism with a sliding U-arm, which enables a choice between a higher-resolution image and a wider-area image. This study was performed to evaluate the spatial resolution of the two scanning(More)
1. In Fig. 2, the label for the x axis, ‘‘Spatial frequency (lp/mm),’’ should be ‘‘Spatial frequency (lp/cm)’’. 2. In Table 2, the units of spatial frequency ‘‘q50 in 1/mm’’ and ‘‘q10 in 1/mm’’ should be ‘‘q50 in 1/cm’’ and ‘‘q10 in 1/cm,’’ respectively. 3. In the second paragraph of ‘‘Discussion’’, in lines 7 and 8, ‘‘26.8 lp/mm’’ and ‘‘22.8 lp/mm’’ should(More)
  • 1