国际生物医学工程杂志
國際生物醫學工程雜誌
국제생물의학공정잡지
INTERNATIONAL JOURNAL OF BIOMEDICAL ENGINEERING
2010年
5期
266-269,288
,共5页
频率复合%弹性成像%仿真%弹性图像信噪比%对比度噪声比%轴向分辨率
頻率複閤%彈性成像%倣真%彈性圖像信譟比%對比度譟聲比%軸嚮分辨率
빈솔복합%탄성성상%방진%탄성도상신조비%대비도조성비%축향분변솔
Frequency compounding%Elastography%Simulation%Elastographic signal-to-noise ratio%Elastographic contrast-to-noise ratio%Axial resolution
目的 目前,有关频率复合技术能否提高弹性成像的信噪比以及对弹性图像性能的影响尚无文献报道,本研究对发射端频率复合技术应用于弹性成像进行了仿真研究.方法 仿真一50 mm×50 mm含2个圆形硬包容物的组织,2包容物直径均为10 mm且均匀分布在组织中轴线上,其弹性模量均为背景组织的10倍;然后仿真使用3.5,5,7.5 MHz频率探头对该组织区域分别进行准静态压缩弹性成像(组织压缩量为1%);最后将3.5 MHz和5 MHz,3.5 MHz和7.5 MHz,3.5 MHz、5 MHz和7.5 MHz频率子图像分别进行复合.结果 复合前各子弹性图像的信噪比(SNRe)分别为8.42、9.62、10.73,对比度噪声比(CNRe)为11.35、14.82、18.37,轴向分辨率为9.83、9.82、9.81;复合后图像的信噪比分别为11.82、13.05、19.45,对比度噪声比为22.31、27.63、56.12,轴向分辨率为9.83、9.83、9.83.结论 复合后的图像比复合前各频率子图像的信噪比、对比度噪声比均有明显提高,轴向分辨率几乎没有损失;使用频率复合技术能有效改善弹性图像的性能,证实了发射端频率复合弹性成像技术的可行性.
目的 目前,有關頻率複閤技術能否提高彈性成像的信譟比以及對彈性圖像性能的影響尚無文獻報道,本研究對髮射耑頻率複閤技術應用于彈性成像進行瞭倣真研究.方法 倣真一50 mm×50 mm含2箇圓形硬包容物的組織,2包容物直徑均為10 mm且均勻分佈在組織中軸線上,其彈性模量均為揹景組織的10倍;然後倣真使用3.5,5,7.5 MHz頻率探頭對該組織區域分彆進行準靜態壓縮彈性成像(組織壓縮量為1%);最後將3.5 MHz和5 MHz,3.5 MHz和7.5 MHz,3.5 MHz、5 MHz和7.5 MHz頻率子圖像分彆進行複閤.結果 複閤前各子彈性圖像的信譟比(SNRe)分彆為8.42、9.62、10.73,對比度譟聲比(CNRe)為11.35、14.82、18.37,軸嚮分辨率為9.83、9.82、9.81;複閤後圖像的信譟比分彆為11.82、13.05、19.45,對比度譟聲比為22.31、27.63、56.12,軸嚮分辨率為9.83、9.83、9.83.結論 複閤後的圖像比複閤前各頻率子圖像的信譟比、對比度譟聲比均有明顯提高,軸嚮分辨率幾乎沒有損失;使用頻率複閤技術能有效改善彈性圖像的性能,證實瞭髮射耑頻率複閤彈性成像技術的可行性.
목적 목전,유관빈솔복합기술능부제고탄성성상적신조비이급대탄성도상성능적영향상무문헌보도,본연구대발사단빈솔복합기술응용우탄성성상진행료방진연구.방법 방진일50 mm×50 mm함2개원형경포용물적조직,2포용물직경균위10 mm차균균분포재조직중축선상,기탄성모량균위배경조직적10배;연후방진사용3.5,5,7.5 MHz빈솔탐두대해조직구역분별진행준정태압축탄성성상(조직압축량위1%);최후장3.5 MHz화5 MHz,3.5 MHz화7.5 MHz,3.5 MHz、5 MHz화7.5 MHz빈솔자도상분별진행복합.결과 복합전각자탄성도상적신조비(SNRe)분별위8.42、9.62、10.73,대비도조성비(CNRe)위11.35、14.82、18.37,축향분변솔위9.83、9.82、9.81;복합후도상적신조비분별위11.82、13.05、19.45,대비도조성비위22.31、27.63、56.12,축향분변솔위9.83、9.83、9.83.결론 복합후적도상비복합전각빈솔자도상적신조비、대비도조성비균유명현제고,축향분변솔궤호몰유손실;사용빈솔복합기술능유효개선탄성도상적성능,증실료발사단빈솔복합탄성성상기술적가행성.
Objective No reports has been found to date on whether frequency compounding can improve elastographic image signal to noise ratio (SNRe) and how it affects elastogram performance.In this paper simulations investigation was carried out on transmit-side frequency compounding (TSFC)for elastography.Methods 50 mm×50 mm tissue model was simulated with two round hard inclusions of 10mm diameter uniformly distributed along the tissue central axial line,and their elasticity modulus were 10 times of the background.Then simulation of 3.5 MHz、5 MHz and 7.5 MHz probes were introduced to form compression elastography of the double-lesion model by quasi-static compression method (applied strain 1%).Then,sub-elastograms obtained by the combination of 3.5 MHz and 5 MHz,3.5 MHz and 5 MHz,3.5 MHz and 7.5 MHz were compounded,respectively.Results Before compounding,signal to noise ratio (SNRe) of the various sub-elastograms were 8.42,9.62,10.73,respectively,contrast to noise ratio (CNRe) were 11.35,14.82,18.37,respectively and axial resolutions were 9.83,9.82,9.81.After compounding elastograms,the SNRe were 11.82,13.05,19.45,CNRe were 22.31,27.63,56.12,while axial resolutions were 9.83,9.83,9.83.Conclusion Frequency compounding elastograms have higher SNRe and CNRe than any sub-elastogram before compounding and have no axial resolution loss.The TSFC can improve elastogram performance efficiently and frequency compounding for elastography enhancement is feasible.
