With these advantages such as no phase shift error, measured fast, portable, high accuracy, the three-dimensional measurement system which is based on the heterodyne principle and digital grating phase-shift technology has been widely used in rock three-dimensional shape measurement. The precision of camera calibration determines the measurement accuracy of the system. In this paper, the Zhang ...

OBJECTIVES An important measure for the diagnosis and monitoring of knee osteoarthritis is the minimum joint space width (mJSW). This requires accurate alignment of the x-ray beam with the tibial plateau, which may not be accomplished in practice. We investigate the feasibility of a new mJSW measurement method from stereo radiographs using 3D statistical shape models (SSM) and evaluate its sens...

STATEMENT OF PROBLEM Rapid prototype (RP) models are used in craniofacial reconstructions; however, there are no standards or acceptable limits to ensure accuracy of the fabricated models. PURPOSE The purpose of this study was to assess the accuracy of RP models by validating the accuracy of SLA skull models with a coordinate measurement device. MATERIAL AND METHODS Stainless steel spheres ...

PURPOSE The purpose of this study was to investigate the accuracy and reliability of the semi-automated ultrasonographic volume measurement tool, virtual organ computer-aided analysis (VOCAL), for measuring the volume of parathyroid glands. METHODS Volume measurements for 40 parathyroid glands were performed in patients with secondary hyperparathyroidism caused by chronic renal failure. The v...

According to the Guide to the Expression of Uncertainty in Measurement, measurement uncertainty in quality control is especially important, as the measured value determines either the acceptance or rejection of a product. As the coordinate measuring machines are not capable of 100% dimensional quality control, the use of optical methods is growing. The problem here is still the lack of methods ...