Laboratory virtual instrument engineering workbench-based semi-automated measurement of cranial asymmetry

Measurement of arterial distensibility is very important in cardiovascular diagnosis for early detection of coronary heart disease and possible prediction of future cardiac events. Conventionally, B-mode ultrasound imaging systems have been used along with expensive vessel wall tracking systems for estimation of arterial distension and calculation of various estimates of compliance. We present a simple instrument for noninvasive in vivo evaluation of arterial compliance using a single element ultrasound transducer. The measurement methodology is initially validated using a proof of concept pilot experiment using a commercial ultrasound pulser-receiver. A prototype system is then developed around a PXI chassis using LABVIEW software. The virtual instrument employs a dynamic threshold algorithm to identify the artery walls and then utilizes a correlation based tracking technique to estimate arterial distension. The end-diastolic echo signals are averaged to reduce error in the automated diameter measurement process. The instrument allows automated measurement of the various measures of arterial compliance with minimal operator intervention. The performance of the virtual instrument was first analyzed using simulated data sets to establish the maximum measurement accuracy achievable under different input signal to noise ratio (SNR) levels. The system could measure distension with accuracy better than 10 μm for positive SNR. The measurement error in diameter was less than 1%. The system was then thoroughly evaluated by the experiments conducted on phantom models of the carotid artery and the accuracy and resolution were found to meet the requirements of the application. Measurements performed on human volunteers indicate that the instrument can measure arterial distension with a precision better than 5%. The end-diastolic arterial diameter can be measured with a precision better than 2% and an accuracy of 1%. The measurement system could lead to the development of small, portable, and inexpensive equipment for estimation of arterial compliance suitable in mass screening of “at risk” patients. The automated compliance measurement algorithm implemented in the instrument requires minimal operator input. The instrument could pave the way for dedicated systems for arterial compliance evaluation targeted at the general medical practitioner who has little or no expertise in vascular ultrasonography.

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Infant negotiation of relational space: Automated measurement of infant head orientation

PsycEXTRA Dataset ◽

10.1037/e579192013-222 ◽

2012 ◽

Author(s):

M. Vaever ◽

S. Koeppe ◽

S. Harder

Keyword(s):

Head Orientation ◽

Automated Measurement ◽

Relational Space

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Automated measurement of aggregate flakiness index

Materials and Structures ◽

10.1617/14154 ◽

2005 ◽

pp. 0-0

Author(s):

M.N. Bouquety

Keyword(s):

Automated Measurement ◽

Flakiness Index

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Virtual instrument as a tool for teaching power quality

Renewable Energy and Power Quality Journal ◽

10.24084/repqj07.525 ◽

2009 ◽

Vol 1 (07) ◽

pp. 842-847 ◽

Cited By ~ 1

Author(s):

Vladimir Dimcev ◽

Zivko Kokolanski ◽

Cvetan Gavrovski ◽

Mare Srbinovska

Keyword(s):

Power Quality ◽

Virtual Instrument

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Automated Measurement of the Spatial Current Density Distribution of Process Electron Beams

Vestnik MEI ◽

10.24160/1993-6982-2018-2-72-79 ◽

2018 ◽

Vol 2 (2) ◽

pp. 72-79

Author(s):

Aleksey S. Kozhechenko ◽

◽

Aleksey V. Shcherbakov ◽

Regina V. Rodyakina ◽

Daria A. Gaponova ◽

...

Keyword(s):

Density Distribution ◽

Current Density ◽

Electron Beams ◽

Current Density Distribution ◽

Automated Measurement ◽

Spatial Current

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Virtual instrument designed for data acquisition

Studia Universitatis Babeș-Bolyai Engineering ◽

10.24193/subbeng.2020.1.20 ◽

2020 ◽

Vol 65 (1) ◽

pp. 179-186

Author(s):

Mihaela Dorica Stroia

Keyword(s):

Software Development ◽

Data Acquisition ◽

Virtual Instrument ◽

Virtual Instrumentation ◽

Design And Implementation ◽

Adequate Design

Current software development directions open up a world of possibilities, especially in the engineering field. Present paper is meant to highlight the advantages and in particular the ease of using virtual instrumentation facilities, with a proper and adequate design and implementation of desired instrument. In this idea we bring into discussion a design for virtual instrument which can be used for data acquisition that can be stored for further simulations according to the needs required by the process in discussion.

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DESIGN OF THE VIRTUAL DEVICE FOR THE SIGNAL SPECTRUM CALCULATION IN THE LABVIEW ENVIRONMENT

Visnyk Universytetu “Ukraina” ◽

10.36994/2707-4110-2019-2-23-12 ◽

2019 ◽

Author(s):

Tossenko O.M.

Keyword(s):

Virtual Instrument ◽

Spectral Characteristics ◽

Spectral Composition ◽

Automated System ◽

Signal Spectrum ◽

Measuring Instruments ◽

Specific Information ◽

Measuring Device ◽

Virtual Device ◽

Graphical Tool

The development of measuring instruments requires a specialist to know the principles of operation of advanced measuring systems. This article describes guidelines for creating a virtual appliance in LabVIEW. LabVIEW (Laboratory Virtual Instrument Engineering Workbench) is a graphical application programming environment used as a standard tool for measuring, analyzing their data, further ma naging devices and objects under study. LabVIEW language is not like other programming languages. It does not create a program, but a virtual tool, designed not only for the simulation of certain processes, but also for the management of hardware and the study of real physical objects. The article deals with the task of designing application software for a specific information-measuring device, analyzes the capabilities of the LabVIEW environment for spectral analysis of various signals, outlines the basic principles and techniques of programming within the framework of the LabVIEW graphical environment during the basic stages of development. The procedure for creating a virtual device is described, which allows to evaluate the spectral composition of the signals, presents a graphical code of execution (diagram) to the program and a graphical tool interface of the virtual device. A number of basic elements used to develop the program are described. The simplicity of the graphic designs, the ease of installation on the field of the program, the clarity and readability of the program — all of which makes LabVIEW preferred over other languages of programming. In most cases, the experiment is the only source of reliable information. And the result is achieved much faster than the methods of "pure" theory. The article substantiates the effectiveness of using a development tool that allows to obtain a software product and ensure the fulfillment of all the basic functions of an automated system. Developing a software algorithm for calculating statistical parameters will help engineering students understand the order of determining spectral characteristics and their place in the structure of experimental research.

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