Evaluation of a small flat rectangular therapeutic ultrasonic transducer intended for intravascular use.
The aim of the proposed study was to evaluate the performance of a flat rectangular (2×10mm2) transducer operating at 4MHz. The intended application of this transducer is intravascular treatment of thrombosis and atherosclerosis.



The transducer's thermal capabilities were tested in two different gel phantoms. MR thermometry was used to demonstrate the thermal capabilities of this type of transducer.



Temperature measurements demonstrated that this simple and small transducer adequately produced high temperatures, which can be utilized for therapeutic purposes. These high temperatures were confirmed using thermocouple and MR measurements. Pulsed ultrasound in combination with thrombolytic drugs and microbubbles was utilized to eliminate porcine thrombi.



The proposed transducer has the potentials to treat atherosclerotic lesions using the thermal properties of ultrasound, since high temperatures can be achieved in less than 5s. The results revealed that the destruction of thrombi using pulsed ultrasound requires long exposure time and high microbubble dosage.
Department of Bioengineering, City University, London, UK.
N
N
Papadopoulos
Department of Bioengineering, City University, London, UK.
G
G
Menikou
Electrical Engineering Department, Cyprus University of Technology, Cyprus.
M
M
Yiannakou
Electrical Engineering Department, Cyprus University of Technology, Cyprus; R&D, MEDSONIC LTD, Limassol, Cyprus.
C
C
Yiallouras
Radiology, Ygia Polyclinic, Limassol, Cyprus.
K
K
Ioannides
Electrical Engineering Department, Cyprus University of Technology, Cyprus. Electronic address: cdamianou@cytanet.com.cy.
C
C
Damianou
Atherosclerosis; Intravascular; Thrombosis; Ultrasound