基于曲光线跟踪算法的超声成像实时模拟研究  

A beam width aware curvilinear ray tracing method for real-time ultrasound simulation

作　　者：倪东[1] 陈思平[1] 汪天富[1] 

机构地区：[1]医学超声关键技术国家地方联合工程实验室,广东省生物医学信息检测与超声成像重点实验室,深圳大学医学院,深圳518060

出　　处：《深圳大学学报（理工版）》2012年第4期322-327,共6页Journal of Shenzhen University(Science and Engineering)

基　　金：国家自然科学基金资助项目(61101026)~~

摘　　要：提出一种超声图像实时模拟新方法,通过调整曲光线参数实时改变超声扫描频率和声束聚焦位置.利用曲光线跟踪算法和基本声学模型,产生能量反射图和衰减图;运用瑞利概率分布函数产生超声斑点模式,通过高斯型点扩散函数进行显示.实验结果表明,利用图形处理器加速显示技术,超声成像模拟速度可达20帧/s.与Field Ⅱ软件的生成结果和真实超声图像的对比,验证了该方法的可行性.A novel curvilinear ray tracing model was proposed to simulate the sound beam from an ultrasound transducer. To test the model＇s efficiency, the scanning frequency and focal length were interactively adjusted to obtain higher lateral resolution in region of interest. This method was also employed to generate reflection image in combination with a simplified acoustic model. We further generated a speckled pattern by employing a probability distribution function, where speckles were rendered using the Gaussian envelope point spread function （PSF）. Results show that the proposed method can generate ultrasound images at a rate above 20 frames per second by accelerating the PSF rendering process using a graphics processing unit. The simulation results, which have been compared with those of Field II and real ultrasound images, demonstrate the feasibility of this method.

关 键 词：医学成像技术 超声成像模拟 超声斑点 声束聚焦 曲光线跟踪 概率分布函数 

分 类 号：R318[医药卫生—生物医学工程] TP751[医药卫生—基础医学]