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dc.contributor.advisorBrian W. Anthony.en_US
dc.contributor.authorGilbertson, Matthew Wrighten_US
dc.contributor.otherMassachusetts Institute of Technology. Dept. of Mechanical Engineering.en_US
dc.date.accessioned2011-06-06T17:44:19Z
dc.date.available2011-06-06T17:44:19Z
dc.date.copyright2010en_US
dc.date.issued2010en_US
dc.identifier.urihttp://hdl.handle.net/1721.1/63232
dc.descriptionThesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.en_US
dc.descriptionCataloged from PDF version of thesis.en_US
dc.descriptionIncludes bibliographical references (p. 129-131).en_US
dc.description.abstractAn hand-held force controlled ultrasound probe has been developed. The controller maintains a prescribed contact force between the probe and a patient's body. The device will enhance the diagnostic capability of free-hand elastography, swept-force compound imaging, and make it easier for a technician to acquire repeatable (i.e. directly comparable) images over time. The mechanical system consists of an ultrasound probe, ballscrew-driven linear actuator, and a force/torque sensor. The feedback controller commands the motor to rotate the ballscrew to translate the ultrasound probe in order to maintain a desired contact force. In preliminary user studies it was found that the control system maintained a constant contact force with 1.7 times less variation than human subjects who watched a force gauge. Users without a visual force display maintained a constant force with 20 times worse variation. The system was also used to determine the viscoelastic properties of soft tissue. In three mock ultrasound examinations one hour apart in which the goal was two obtain two consistent images at the same force, an unassisted operator obtained the second image at a 20% lower force, while the operator assisted by the controller obtained the same force to within <2%. The device enables users to gather more force-consistent images over time.en_US
dc.description.statementofresponsibilityby Matthew Wright Gilbertson.en_US
dc.format.extent131 p.en_US
dc.language.isoengen_US
dc.publisherMassachusetts Institute of Technologyen_US
dc.rightsM.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.en_US
dc.rights.urihttp://dspace.mit.edu/handle/1721.1/7582en_US
dc.subjectMechanical Engineering.en_US
dc.titleHandheld force-controlled ultrasound probeen_US
dc.title.alternativeHand held force-controlled ultrasound probeen_US
dc.typeThesisen_US
dc.description.degreeS.M.en_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Mechanical Engineering
dc.identifier.oclc726654422en_US


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