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Biomedical subjects

T Sunayashiki

Publications and source records attributed to T Sunayashiki.

At least 19 recordsLinked to original sources
PubMed1991

Effect of size of region of interest on precision of bone mineral measurements of the mandible by quantitative computed tomography.

The effect of size and shape of the region of interest (ROI) on the precision of the measurements of bone mineral content of mandibular bone by quantitative computed tomography (QCT) has been studied. A dry mandible and a series of calcium carbonate rods (density: 119.6 mg cm-3, 461.2 mg cm-3 and 939.0 mg cm-3) were used. The precision of measurements of the ROI for sizes less than 1 cm2 was very low, but the shape did not have any influence on the precision if the material examined was either homogeneous or if it was heterogeneous from always the same area. Higher precision was found when the ROI was more than 1 cm2. The size of ROI is a critical factor in the measurement of bone mineral content in the mandible by QCT.

Bone Density↗
PubMed1987

Digital image processing of dentomaxillofacial radiographs.

The improvement in the image quality of dentomaxillofacial radiographs (panoramic radiographs) with the use of a digital image-processing system was examined. Linear and nonlinear unsharp masking techniques were employed for image processing. The quality of the processed images was found to be markedly improved over that in original radiographs. The detail visibility of linearly enhanced images, especially in low-density areas, was superior to that of nonlinearly enhanced images, although the presence of more artifacts and more noise was noted in linearly enhanced images. Radiographic diagnosis in the dentomaxillofacial region can be improved with this system.

Humans↗