Cross-sectional area measurement in collapsed tubes using the transformer principle
Identifieur interne : 002594 ( Istex/Corpus ); précédent : 002593; suivant : 002595Cross-sectional area measurement in collapsed tubes using the transformer principle
Auteurs : C. D. Bertram ; C. RibreauSource :
- Medical and Biological Engineering and Computing [ 0140-0118 ] ; 1989-07-01.
English descriptors
- KwdEn :
- Area measurement, Beam axis, Behaviour, Coil, Coil axis, Collapsible, Collapsible tube, Collapsible tubes, Dynamic response, Elastic tubes, Electromagnetic method, Electromechanical shaker, Elliptical tubes, Expt, Fine wire, First tube, Flat coil, Flexural rigidity, Gold wire, Internal area, Internal pressure, July, Negative transmural pressures, Open circles, Opposite sides, Opposite wall contact, Perimeter, Perimetric length, Pressure scale, Second experiment, Second tube, Significant change, Single wire, Soft tissue, Standard deviation, Steel wire, Transmural, Transmural pressure, Tube, Tube area, Tube dimensions, Tube perimeter, Tube wall, Tube wall thickness, Ultrasonic images, Ultrasonic method, Ultrasonic systems, Ultrasonic transducer, Unsupported length, Wall thickness, Water bath, Wire crosssection, Wire site.
- Teeft :
- Area measurement, Beam axis, Behaviour, Coil, Coil axis, Collapsible, Collapsible tube, Collapsible tubes, Dynamic response, Elastic tubes, Electromagnetic method, Electromechanical shaker, Elliptical tubes, Expt, Fine wire, First tube, Flat coil, Flexural rigidity, Gold wire, Internal area, Internal pressure, July, Negative transmural pressures, Open circles, Opposite sides, Opposite wall contact, Perimeter, Perimetric length, Pressure scale, Second experiment, Second tube, Significant change, Single wire, Soft tissue, Standard deviation, Steel wire, Transmural, Transmural pressure, Tube, Tube area, Tube dimensions, Tube perimeter, Tube wall, Tube wall thickness, Ultrasonic images, Ultrasonic method, Ultrasonic systems, Ultrasonic transducer, Unsupported length, Wall thickness, Water bath, Wire crosssection, Wire site.
Abstract
Abstract: To avoid the necessity for intraluminal catheters as used with the axial impedance method of measuring the cross-sectional area of flexible tubes independently of their shape, while retaining the advantage of an immediate electrical output, an electromagnetic method was tested. The method uses a single-turn sensing coil attached to or embedded in the tube wall at the site of interest as the secondary winding of a transformer. One or more primary coils coaxial with the tube provide an alternating magnetic field parallel to the tube axis, and the resulting secondary voltage, after amplification and demodulation, is directly proportional to tube cross-sectional area. Tube pressure/area relationships measured thus were compared with those measured using both an ultrasonic imaging technique and liquid volume displacement. The method was shown to provide an accurate and relatively simple alternative to the impedance method. Various ways to fabricate tubes with or otherwise introduce the necessary sensing coil are discussed.
Url:
DOI: 10.1007/BF02441426
Links to Exploration step
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<front><div type="abstract" xml:lang="en">Abstract: To avoid the necessity for intraluminal catheters as used with the axial impedance method of measuring the cross-sectional area of flexible tubes independently of their shape, while retaining the advantage of an immediate electrical output, an electromagnetic method was tested. The method uses a single-turn sensing coil attached to or embedded in the tube wall at the site of interest as the secondary winding of a transformer. One or more primary coils coaxial with the tube provide an alternating magnetic field parallel to the tube axis, and the resulting secondary voltage, after amplification and demodulation, is directly proportional to tube cross-sectional area. Tube pressure/area relationships measured thus were compared with those measured using both an ultrasonic imaging technique and liquid volume displacement. The method was shown to provide an accurate and relatively simple alternative to the impedance method. Various ways to fabricate tubes with or otherwise introduce the necessary sensing coil are discussed.</div>
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<ArticleTitle Language="En">Cross-sectional area measurement in collapsed tubes using the transformer principle</ArticleTitle>
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<Para>To avoid the necessity for intraluminal catheters as used with the axial impedance method of measuring the cross-sectional area of flexible tubes independently of their shape, while retaining the advantage of an immediate electrical output, an electromagnetic method was tested. The method uses a single-turn sensing coil attached to or embedded in the tube wall at the site of interest as the secondary winding of a transformer. One or more primary coils coaxial with the tube provide an alternating magnetic field parallel to the tube axis, and the resulting secondary voltage, after amplification and demodulation, is directly proportional to tube cross-sectional area. Tube pressure/area relationships measured thus were compared with those measured using both an ultrasonic imaging technique and liquid volume displacement. The method was shown to provide an accurate and relatively simple alternative to the impedance method. Various ways to fabricate tubes with or otherwise introduce the necessary sensing coil are discussed.</Para>
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<KeywordGroup Language="En"><Heading>Keywords</Heading>
<Keyword>Area measurement</Keyword>
<Keyword>Collapsible tubes</Keyword>
<Keyword>Imaging</Keyword>
<Keyword>Inductance</Keyword>
<Keyword>Transducer</Keyword>
<Keyword>Transformer</Keyword>
<Keyword>Ultrasound</Keyword>
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<abstract lang="en">Abstract: To avoid the necessity for intraluminal catheters as used with the axial impedance method of measuring the cross-sectional area of flexible tubes independently of their shape, while retaining the advantage of an immediate electrical output, an electromagnetic method was tested. The method uses a single-turn sensing coil attached to or embedded in the tube wall at the site of interest as the secondary winding of a transformer. One or more primary coils coaxial with the tube provide an alternating magnetic field parallel to the tube axis, and the resulting secondary voltage, after amplification and demodulation, is directly proportional to tube cross-sectional area. Tube pressure/area relationships measured thus were compared with those measured using both an ultrasonic imaging technique and liquid volume displacement. The method was shown to provide an accurate and relatively simple alternative to the impedance method. Various ways to fabricate tubes with or otherwise introduce the necessary sensing coil are discussed.</abstract>
<note>Transducers and Electrodes</note>
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<subject><genre>Engineering</genre>
<topic>Human Physiology</topic>
<topic>Neurosciences</topic>
<topic>Imaging / Radiology</topic>
<topic>Computer Applications</topic>
<topic>Biomedical Engineering</topic>
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