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工業技術研究院

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技術名稱: 超音波

技術簡介

為了提升現有之超音波系統之成像速率,以及改善平面波 成像使用Delay and sum beamforming成像品質不理想 等缺點,本計畫將評估在傳送端使用平面波發射,後端搭 配k-space Beamforming成像技術取代傳統掃瞄成像搭 載動態接收聚焦(dynamic receive focus)技術,並搭 配多個角度平面波成像的angular compounding,同時 提升幀率並解決平面波成像品質不足的問題,經實驗證實 此方法成像效果良好。 此外,由於希望將此超高速的成像技術進一步應用於超音 波彈性影像(Elastography)上,以超高的幀率(目前工研 院技術的acquisition frame rate 可高達10000 fps) 來觀測shear wave傳遞速度,進而計算出組織的彈性係 數。所以本計畫也將評估使超音波系統能夠一次發射便激 發出大範圍的shear wave,藉以提升彈性影像的幀率, 並降低發射能量的技術方法。

Abstract

The high frame rate ultrasonic imaging has enabled new powerful imaging modalities such as Elastography. To achieve high frame rate, the plane-wave transmission and post- acquisition beamforming are used. However, because of lack of transmission focusing, the images obtained using plane-wave transmission suffers from low resolution and low contrast. Therefore, in this paper we proposed a way to improve the beamforming process by using k- space beamforming and angular compounding with coherence factor method. With our new method, high-quality echographic images are obtained without significantly affect the high frame rate capabilities. Tissue-mimicking phantom experimental results of the proposed method have been demonstrated. According to the experimental results, the proposed method is able to reach an image quality comparable to conventional B-mode with only 5 angles of plane-wave insonification.

技術規格

成像的幀率:10,000fps 剪力波(拓展景深)範圍 >10mm

Technical Specification

acquisition frame rate:10,000fps shear wave(Extended Depth of Focus) >10 mm

技術特色

在提升超音波影像訊雜比與對比解析度方面,本計畫更進一步使用angular image compounding 和 coherence factor 等技 術,在維持高幀率的條件下,同時提升訊雜比 (Signal-to-Noise Ratio, SNR) 與對比解析度 (contrast resolution) ,以 達到提高訊號品質與降低成本的優點,最後再經過後端影像處理獲得高品質的超音波影像。

應用範圍

超音波成像技術

接受技術者具備基礎建議(設備)

超音波系統(Verasonics) Win7 32/64-bit電腦 nVidia GPU卡

接受技術者具備基礎建議(專業)

Matlab程式開發 GPU程式開發

技術分類 醫療電子

聯絡資訊

聯絡人:張奇偉 生醫資電技術組(0M000)

電話:+886-3-5917450 或 Email:ChirWeeiChang@itri.org.tw

客服專線:+886-800-45-8899

傳真:+886-3-5912444

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