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System Accuracy (system + accuracy)
Selected AbstractsMagnetic resonance imaging as a predictive tool for sensory characteristics and intramuscular fat content of dry-cured loinJOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE, Issue 4 2003Teresa Antequera Abstract A novel methodology to non-invasively and objectively predict sensory traits and intramuscular fat content of dry-cured Iberian loins was studied. Texture analysis of magnetic resonance images was performed on 47 dry-cured Iberian loins. Appearance and texture traits were assessed by a 18-member trained panel, and intramuscular fat content was chemically extracted and quantified for the same samples. Three classes of dry-cured loin according to each sensory and chemical trait were established (low, medium and high). Using the texture features selected by the floating search method (FSM), a system accuracy of 83% for intramuscular fat content and not lower than 70% for all sensory traits was obtained. These results are encouraging for the application of this methodology, allowing in situ, automatic, objective and non-destructive classification of loins. © 2003 Society of Chemical Industry [source] Wearable Data Collection System for Online Gait Stability AnalysisNEUROMODULATION, Issue 3 2004Tomaz Karcnik DSc Abstract We had shown in our previous research that the stability assessment and control are essential for generation of faster and more energy efficient functional electrical stimulation (FES) and/or crutch-assisted gait. The objective of our recent research work has been to design a wearable and portable system for gait stability analysis with online capabilities that is also applicable to crutch-assisted gait modes. The developed wearable stability assessment system for as yet only biped gait consists of foot switches and goniometers attached to the leg joints. The instantaneous static and dynamic stability is, within the wearable system, assessed from the trajectory of the estimated body center of gravity (COGHAT) and the supporting area shape/size as derived from step length and foot-floor contact state. We used motion analysis system data as reference for testing the wearable system accuracy. The wearable system was tested on five healthy subjects and one above-knee amputee. It proved to be reasonably accurate if compared to the classical, motion analysis system based method. However, additional work is required to port the system to the FES assisted and/or crutch assisted gait. [source] Accuracy of a computerized tomography-guided template-assisted implant placement system: an in vitro studyCLINICAL ORAL IMPLANTS RESEARCH, Issue 10 2009Jacob Horwitz Abstract Objectives: To evaluate the accuracy of computer-assisted 3D planning and implant insertion using computerized tomography (CT). Materials and methods: Nine implants were planned on pre-operative CTs of six resin models, which were acquired with radiographic templates, using a planning software (E implants). Each resin model contained three pre-existing control implants (C implants). Radiographic templates were converted into operative guides containing 4.8-mm-diameter titanium sleeves. A single set of insertable sleeves was used for consecutively drilling the six models, followed by implant insertion through the guide sleeves. Models were further divided into group A (the first three models) and group B (the last three models). Post-operative CTs were used to compare implant positions with pre-operative planned positions. Statistical analysis included the Mann,Whitney U test for E and C implants and the Wilcoxon's signed ranks test for groups A and B. Results: The mean apex depth deviations for E and C implants [0.49 mm±0.36 standard deviation (SD) and 0.32 mm±0.21 SD, respectively], and the mean apex radial deviations (0.63 mm±0.38 SD and 0.49 mm±0.17 SD, respectively) were similar (P>0.05). The mean angulation deviations for E and C implants were 2.17±1.06°SD and 1.33±0.69°SD, P<0.05. E implant deviations of all the parameters in group A were significantly smaller than E implant deviations in group B. Conclusions: Computer-assisted implant planning and insertion provides good accuracy. Deviations are mainly related to system and reproducibility errors. Multiple use of drills and titanium sleeves significantly reduces system accuracy. [source] The development of an NMR chemical shift prediction application with the accuracy necessary to grade proton NMR spectra for identityMAGNETIC RESONANCE IN CHEMISTRY, Issue 12 2009Stephen G. Spanton Abstract We have developed an NMR chemical shift prediction system that enables high throughput automatic grading of NMR spectra. In support of high throughput synthetic efforts for our drug discovery program, a rapid and accurate analysis for identity was needed. The system was designed and implemented to take advantage of the NMR assignments that had been tabulated on internally generated research compounds. The system has been operational for four years and has been used in conjunction with an internally written grading program to successfully analyze several hundred thousand samples based only on their 1D 1H spectrum. A focused test of the system's accuracy on 1006 molecules demonstrated the ability to estimate the proton chemical shift with an average error of +/,0.16 ppm. This level of chemical shift accuracy allows for reliable structure confirmation by automated analysis using only proton NMR. Copyright © 2009 John Wiley & Sons, Ltd. [source] | |||||||||||||