Results 201 to 210 of about 222,275 (261)
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A method for improving measurement accuracy of cylinders in dimensional CT metrology
Computer-Aided Design, 2015Measurement quality of industrial cone beam X-ray computed tomography (CT) is influenced by many types of artefacts, therefore, industrial-level accuracy is difficult to attain. In order to avoid the influences of these artefacts, this paper proposes a new method for measuring cylindrical surface that is a common geometric structure in mechanical parts.
Lin Xue +6 more
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In Vitro Measurement Accuracy of Three‐Dimensional Ultrasound
Echocardiography, 2001Objectives: We sought to validate distance and volume measurements in three‐dimensional (3‐D) ultrasound images. Background: Even with the latest equipment, it is not known how accurate 3‐D echocardiographic measurements are. Methods: Six models were imaged in ethanol solution and two within a tissue phantom using a mechanical rotation device rotating ...
R J, Zotz +3 more
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The accuracy of dimensional measurement in ultrasonic real-time scanning
The British Journal of Radiology, 1981The ease of examination with real-time ultrasonic scanners, together with the provision of calipers, combine to make dimensional measurement of anatomical or pathological features an attractive index, that should ideally be independent of the operator.
R C, Chivers, R A, Bacon, T J, Bloomberg
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The accuracy of measurements of three-dimensional computed tomography reconstructions
Journal of Oral and Maxillofacial Surgery, 1996The purpose of this study was to evaluate the accuracy and reproducibility of linear measurements obtained from three-dimensional reconstructions of computed tomography (CT) scans.Ten rectangular acrylic blocks were prepared with titanium molybdenum alloy (TMA) markers spaced from 1 to 10 mm, respectively.
S W, Covino +3 more
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Measuring Accuracy of Three-Dimensional Displacements in Holographic Interferometry
Applied Optics, 1973In order to establish a quantitative method of measuring the distribution of three-dimensional displacements by holographic interferometry, measuring errors caused by the following two factors are analyzed quantitatively: (i) reading error of fringe order, (ii) setting error of observing and illuminating directions.
T, Matsumoto, K, Iwata, R, Nagata
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Three‐dimensional measurement accuracy of skull surface landmarks
American Journal of Physical Anthropology, 1988AbstractCraniometric measuremnts from a three‐dimensional (3‐D) digitizing system were compared with those from sliding and spreading calipers. The 3‐D system consisted of a 3‐Space Digitizer, Macintosh Plus computer, and Unigraphics CAD/CAM system. Twenty‐nine standard measurements were made and repeated on two normal and three deformed skulls.
C F, Hildebolt, M W, Vannier
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Increasing the accuracy of imaging-based dimensional measurements
Optics and Photonics for Advanced Dimensional Metrology, 2020More than 95% of industrial inspection systems still rely on pure 2D information. Different measurement tasks like defect detection, micro-structure characterization, spectral characterization and dimensional metrology are typical application scenarios where standard 2D image processing based measurement systems are used.
Tobias Haist +2 more
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