Prototype dual frequency bilaminar array transducer capable of therapeutic exposure at 500 kHz and doppler monitoring at 2MHz

Takashi Azuma, Shin Ichiro Umemura, Makoto Ogiliara, Jun Kubota, Takashi Kobayashi, Mikio Izumi, Akira Sasaki, Hiroshi Furuhata

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)

Abstract

It is known that ultrasound can enhance thrombolysis with tissue plasminogen activator (tPA). A blood flow monitoring is required for an optimum control of the tPA injection and the therapeutic sonication. In order to transmit ultrasonic waves at two frequencies, one for imaging and the other for therapy, from the same aperture, we proposed a probe consisting of a therapeutic array with an imaging array overlaid on it. Between these two arrays, a frequency selective isolation layer was inserted to ensure independent oscillatory motions of the two arrays. The function of this layer is expected to reflect the waves from the imaging array and allow the waves from the therapeutic array to pass through. A prototype sector array transducer was designed and constructed based on numerical simulation. B-mode and color flow images of human brains obtained with the prototype were comparable to those of conventional structure transducers with respect to sensitivity and resolution. Schlieren images showed that the sidelobe levels of the therapeutic beam were less than -20 dB when steering angle was limited to 45 degrees in each direction.

Original languageEnglish
Pages (from-to)141-144
Number of pages4
JournalProceedings - IEEE Ultrasonics Symposium
Volume1
Publication statusPublished - 2004 Dec 1
Event2004 IEEE Ultrasonics Symposium - Montreal, Que., Canada
Duration: 2004 Aug 232004 Aug 27

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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