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2014 Vol.33, Issue 5 Preview Page
Fabrication and Evaluation of High Frequency Ultrasound Receive Transducers for Intravascular Photoacoustic Imaging

혈관내 광음향 영상을 위한 고주파수 초음파 수신 변환기 제작 및 평가

Jun-Su Lee1
,
Jin Ho Chang2*
이 준수1
,
장 진호2*
1서강대학교 전자공학과
2서강대학교 서강미래기술연구원, 바이오융합 및 전자공학과
*교신저자. *Corresponding Author. 
30 September 2014. pp. 300-308
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Abstract

Photoacoustic imaging is a useful tool for the diagnosis of atherosclerosis because it is capable of providing anatomical and pathological information at the same time. A photoacoustic signal detector is a pivotal element to achieve high spatial resolution, so that it should have broadband spectrum with a high center frequency. Since a photoacoustic imaging probe is directly inserted into blood vessel to diagnose atherosclerosis, the total size of the photoacoustic signal detector should be less than 1 mm. The main purpose of this paper is to demonstrate that PVDF can be used as an active material for the photoacoustic signal detector with a high frequency and broadband characteristic. The photoacoustic signal detector developed in this study was a single element ultrasound transducer with an aperture of 0.5 × 0.5 mm and the total size of 1 mm. In the design stage, the natural focal depth was adjusted for an effective focal area to cover the region of interest, i.e., 1 ~ 5 mm in depth. This was because geometrical focusing could not be used due to the small aperture. Through a pulse-echo test, it was ascertained that the developed photoacoustic signal detector has the -6 dB bandwidth ranging between 40.1 and 112.8 MHz and the center frequency of 76.83 MHz.

Keywords
Atherosclerosis
Intravascular ultrasound imaging
Intravascular photoacoustic imaging
High frequency ultrasound transducer
PVDF

광음향 영상은 조직의 형태학적 정보뿐만 아니라 병리학적 정보도 함께 제공할 수 있어 죽상동맥경화증 진단에 유용하게 사용될 수 있다. 높은 해상도의 광음향 영상을 획득하기 위해서는 광음향 신호를 수신할 초음파 변환기가 고주파수 및 광대역 특성을 가져야만 한다. 또한 죽상동맥경화증 진단을 위해서는 혈관에 변환기를 직접 삽입하여 광음향 영상 신호를 획득해야하기 때문에 그 크기가 1 mm 이하가 되어야만 한다. 본 논문에서는 PVDF 압전 소재를 이용하여 혈관내 광음향 영상을 위한 고주파수, 광대역 특성을 갖는 초음파 변환기 제작이 가능함을 보였다. 개발한 광음향 수신 변환기는 단일소자이며 구경은 0.5 × 0.5 mm이고 전체 변환기 크기는 직경이 1 mm이내가 되도록 하였다. 작은 크기로 인해 형태학적 빔집속이 아닌 자연집속 깊이를 조절하여 관심영역(1~5 mm)에서 빔집속이 되도록 설계하였다. 제작한 혈관내 광음향 수신 변환기의 주파수 특성을 펄스-에코 응답실험을 통해 알아보았다. 제작된 변환기는 -6 dB 대역폭이 40.1~112.8 MHz이며, 중심 주파수가 76.83 MHz인 고주파수 및 광대역 특성을 갖는다는 것을 실험적으로 확인하였다.

키워드
죽상동맥경화증
혈관내 초음파 영상
혈관내 광음향 영상
고주파수 초음파 변환기
PVDF
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Information
  • Publisher :The Acoustical Society of Korea
  • Publisher(Ko) :한국음향학회
  • Journal Title :The Journal of the Acoustical Society of Korea
  • Journal Title(Ko) :한국음향학회지
  • Volume : 33
  • No :5
  • Pages :300-308
  • Received Date : 2014-05-19
  • Revised Date : 2014-07-28
  • Accepted Date : 2014-08-05
  • DOI :https://doi.org/10.7776/ASK.2014.33.5.300
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