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Accurate temperature estimation in ultrasonic pulse-echo systems
2003 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The entire setting process of injectable bone cement used for bone defect filling can be monitored using pulse-echo ultrasound. It is important to understand the setting process of the bone cement to enable an efficient and secure use of the material. That is, for example how long time a doctor can work with a material during a surgery, and when he can close the wound without risk to deform the material. The mechanical properties of a material affect its acoustical properties, so changes in the mechanical properties can be calculated using the changes in the acoustical properties. For example, the changes in the attenuation and speed of sound of a pulse during setting can be used to determine the density of the bone cement. One problem when measuring is that the attenuation and speed of sound change not only with the density, but also with the temperature. This causes a sensitivity to temperature changes to the measuring method. The probe used to monitor the setting process of injectable bone cement consists of an ultrasound transducer attached to a plastic, PMMA, and a steel reflector. The cement sample is put between the PMMA and the cement. When the pulse that the ultrasound transducer generates travels trough the probe, parts of it are reflected at every interface between the three different materials. A change of the temperature in the PMMA causes problems when measuring since this change affects the pulse that travels trough the material. If this temperature change is known it can be compensated for. The aim of this thesis is to try a new method to estimate the temperature changes in PMMA using ultrasound. The precision of this estimation is also investigated. The results show that the temperature can be estimated with a precision of down to 0.1ºC for a temperature range of 5ºC to 60ºC using a second order polynomial model.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Ultrasound, bone cement, temperature estimation
Keyword [sv]
URN: urn:nbn:se:ltu:diva-58284ISRN: LTU-EX--03/200--SELocal ID: edf78731-2e03-4308-9a92-8dea6b7922a2OAI: diva2:1031672
Subject / course
Student thesis, at least 30 credits
Educational program
Computer Science and Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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