Results 211 to 220 of about 222,275 (261)
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Three-dimensional measurement: The accuracy and precision of the reflex metrograph
British Journal of Oral and Maxillofacial Surgery, 1988The Reflex Metrograph is an optical plotter which is linked directly to a microcomputer and allows direct three-dimensional measurements of irregular shaped objects up to 300 mm maximum dimension without contacting the object. This study shows that it is possible to generate reproducible results with an operator measurement error of less than 0.2 mm ...
B, Speculand +2 more
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A two dimensional accuracy-based measure for classification performance
Information Sciences, 2017Abstract Accuracy has been used traditionally to evaluate the performance of classifiers. However, it is well known that accuracy is not able to capture all the different factors that characterize the performance of a multiclass classifier. In this manuscript, accuracy is studied and analyzed as a weighted average of the classification rate of each ...
Mariano Carbonero-Ruz +4 more
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Three-dimensional measurement: The accuracy and precision of the reflex microscope
British Journal of Oral and Maxillofacial Surgery, 1988The Reflex Microscope is an optical plotter which is linked directly to a microcomputer and allows direct three-dimensional measurements of irregular shaped objects up to 100 mm maximum dimension. This study shows that it is possible to generate reproducible results with an operator measurement error of less than 0.15 mm for linear distances.
B, Speculand +2 more
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Dimensional Accuracy of Two‐Step Impressions Measured on Scanned Casts in CAD [PDF]
Journal of Prosthodontics, 2015 AbstractPurposeThe purpose of the study was to find out how light‐body impression material thickness influences the horizontal dimensional accuracy of casts examined on a scanned model.Materials and MethodsCustomized manikin mandibles were used for impression taking with a dual‐phase impression method.
Baráth Zoltán Lajos +3 more
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Accuracy and reproducibility of 3-dimensional digital model measurements
American Journal of Orthodontics and Dentofacial Orthopedics, 2012The purpose of this study was to evaluate the reliability of measurements made on 3-dimensional digital models obtained with a surface laser scanner (D-250; 3Shape, Copenhagen, Denmark).Twenty orthodontic dental casts of permanent dentitions were selected.
Marinês Vieira S, Sousa +4 more
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In-process dimensional measurement and control of workpiece accuracy
International Journal of Machine Tools and Manufacture, 1997Abstract This paper surveys the available technology for “in-process control” of machined products, particularly in relation to turning, and cylindrical grinding, prior to completion of the machining process. The techniques developed for controlling accuracy of the workpiece, whilst in situ , are described using representative examples of current ...
T. Yandayan, M. Burdekin
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Accuracy and traceability in dimensional measurements
SPIE Proceedings, 1998While the importance of the concepts of measurement accuracy and measurement traceability has long been recognized, they have not always been applied in a consistent or rigorous manner. In 1993 the International Organization for Standards (ISO) published two documents which establish consistent definitions of these and other metrology terms and provide
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Accuracy of three-dimensional measurements using cone-beam CT
Dentomaxillofacial Radiology, 2006Lesions causing intraosseous defects in the head and neck region are difficult to diagnose using two-dimensional radiography, and three-dimensional (3D) data provided by CT is useful but often difficult to obtain. Recently, cone-beam CT (CBCT) was made available, with the potential to become a practical tool in dentistry.
H M, Pinsky +4 more
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Accuracy in integrated circuit dimensional measurements
SPIE Proceedings, 1994The measurement of critical dimensions of features on integrated circuits and photomasks is modeled as the comparison of the images of the test object and of a standard object in a measuring device. A length measuring instrument is then a comparator. The calibration of the standard and the conditions necessary for a valid comparison are discussed.
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Accuracy and Precision of In Vitro Volumetric Measurements by Three-Dimensional Sonography
Investigative Radiology, 1996A radiologist often wishes to measure organ volume or monitor changes in internal lesion volume during treatment. If this can be determined via three-dimensional ultrasound, the relative simplicity of the procedure and the decreased cost and known risks to the patient would make this method an attractive alternative to other modalities.Three ...
J, Wong +3 more
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