CAJ | 학술논문

为了探讨压放频率对压迫式超声弹性成像结果的影响，文中采用外置激振器产生不同的频率来振动组织，超声探头同步采集 RF 回波信号，通过位移估计和应变估计获得其连续应变场图像。实验结果表明：临床上由于采用瞬时组织应变进行成像，不同的压放频率对成像结果将造成影响；应变幅值在频率增大的同时会逐渐减小，将影响成像的对比度，应变均值在频率变化时能保持较好的稳定性，在不同组织之间的差异也较明显。采用应变均值成像相对于瞬时应变更具有临床参考意义。
위료탐토압방빈솔대압박식초성탄성성상결과적영향，문중채용외치격진기산생불동적빈솔래진동조직，초성탐두동보채집 RF 회파신호，통과위이고계화응변고계획득기련속응변장도상。실험결과표명：림상상유우채용순시조직응변진행성상，불동적압방빈솔대성상결과장조성영향；응변폭치재빈솔증대적동시회축점감소，장영향성상적대비도，응변균치재빈솔변화시능보지교호적은정성，재불동조직지간적차이야교명현。채용응변균치성상상대우순시응변경구유림상삼고의의。
The effect of frequency on the imaging was focused by this paper,an external vibrator which generated sine signals with dif-ferent frequency were used to compress tissues,then a set of RF echo data were received by ultrasonic transducer.The continuous tis-sue strain field was obtained by motion estimation and strain estimation.The elastograph is obtained clinically as instantaneous strain imaging,thus the frequency of compression will affect the imaging results.The amplitude of strain decreased with the increasing of fre-quency,which will affect the image contrast.The results also showed that the mean of continuous strain could remain stable when fre-quency changed,which showed obviously different for different tissues.Compared with instantaneous strain,the mean of continuous strain has more profoundly clinical application significance.