한국음향학회지 (The Journal of the Acoustical Society of Korea)

  • 제39권1호
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  • Pages.16-23
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  • 2020
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  • 1225-4428(pISSN)
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  • 2287-3775(eISSN)
한국음향학회 (The Acoustical Society of Korea)
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초음파 영상을 이용한 고강도 집중 초음파 빔 시각화

High-intensity focused ultrasound beam path visualization using ultrasound imaging

  • Song, Jae Hee (Queenland Brain Institute, University of Queenland) ;
  • Chang, Jin Ho (Departments of Electronic Engineering and Biomedical Engineering, Sogang University) ;
  • Yoo, Yang Mo (Departments of Electronic Engineering and Biomedical Engineering, Sogang University)
  • 투고 : 2019.05.14
  • 심사 : 2020.01.10
  • 발행 : 2020.01.31
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⟨ 이전 논문 다음 논문 ⟩

초록

고강도 집중 초음파(High-Intensity Focused Ultrasound, HIFU) 치료에서 HIFU 초점의 효과적인 위치 파악은 안전한 치료 계획을 개발하는 데 중요하다. 자기 공명 영상 유도 HIFU(Magnetic Resonance Imaging guided HIFU, MRIgHIFU)는 HIFU 초점을 영상화하여 치료 중에 초음파 경로를 시각화 할 수 있지만 초음파 이미징 유도 HIFU(Ultrasound imaging guided HIFU, USIgHIFU)에서는 어려움이 있다. 본 연구에서는 USIgHIFU에 대해 HIFU 초점을 영상화할 수 있는 실시간 초음파 빔 시각화 기법을 제시 하였다. 제안 된 방법에서, 음향 강도(Ispta < 720 mW/㎠) 아래의 이미징 초음파 변환자의 동일한 중심 주파수를 갖는 짧은 펄스가 HIFU 변환기를 통해 전송되고, HIFU 빔 경로를 시각화하기 위해 수신 신호는 동적 수신 포커싱 및 후속 에코 처리를 거쳤다. 소 혈청 알부민 젤 팬텀을 이용한 생체외 실험으로부터, HIFU 빔 경로는 낮은 음향 강도 (Ispta = 94.8 mW/㎠)에서도 명확히 영상화 할 수 있었고 HIFU 초점은 손상이 생성되기 전에 성공적으로 시각화하였다. 이 결과는 제안 된 초음파 빔 경로 시각화 방법이 USIgHIFU 치료에서 원치 않는 조직 손상을 최소화하면서 실시간으로 HIFU 초점을 영상화하는 데 사용될 수 있음을 나타낸다.

In High-Intensity Focused Ultrasound (HIFU) treatment, effective localization of HIFU focus is important for developing a safe treatment plan. While Magnetic Resonance Imaging guided HIFU (MRIgHIFU) can visualize the ultrasound path during the treatment for localizing HIFU focus, it is challenging in ultrasound imaging guided HIFU (USIgHIFU). In the present study, a real-time ultrasound beam visualization technique capable of localizing HIFU focus is presented for USIgHIFU. In the proposed method, a short pulse, with the same center frequency of an imaging ultrasound transducer below the regulated acoustic intensity (i.e., Ispta < 720 mW/㎠), was transmitted through a HIFU transducer whereupon backscattered signals were received by the imaging transducer. To visualize the HIFU beam path, the backscattered signals underwent dynamic receive focusing and subsequent echo processing. From in vitro experiments with bovine serum albumin gel phantoms, the HIFU beam path was clearly depicted with low acoustic intensity (i.e., Ispta of 94.8 mW/㎠) and the HIFU focus was successfully localized before any damages were produced. This result indicates that the proposed ultrasound beam path visualization method can be used for localizing the HIFU focus in real time while minimizing unwanted tissue damage in USIgHIFU treatment.

키워드

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