Ultrasonic Reflectivity Computed Tomography with Small Number of Transmitter/Receiver Transducers for the Carotid Diagnosis

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  • 少数の送受信素子で構成した頸動脈診断用超音波反射率CT
  • ショウスウ ノ ソウジュシン ソシ デ コウセイ シタ ケイドウミャク シンダンヨウ チョウオンパ ハンシャリツ CT

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Abstract

We developed an ultrasound reflectivity computed tomography(CT) system with only small number of transmitter/receiver transducers for the carotid diagnosis. To this end, a ring array system with 8 element transducers was fabricated with center frequency 10MHz. The present CT technique assures the image with high resolution in the order of 0.1mm over the entire imaging region. In addition to that, the reduction of the number of transducer element enables the fast data acquisition and the lower cost hardware system. With appropriate combinations of the dual and/or separate transmitter and receiver pairs, 21 backscattering projection data were observed. To comply with the ill-posed inverse problem due to the lack of the angular view data, conjugate gradient method was applied for the solution of the matrix observation equation. Both experiment and simulation examinations were made using the cylindrical shell object as a carotid phantom. As a result, it is demonstrated that the image with greater resolution compared with the conventional B-mode method can be obtained by using only 8 element transducers.

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