瞬时弹性成像技术中改进应变估计的.pdf

Vol. 4 / Jan. 2010
瞬时弹性成像技术中改进应变估计的
匹配滤波器设计
Match y a vibrator or the acoustic radiation force 35mm) integrated on a low frequency vibrator (Bruel&
generated by an ultrasound single element transducer Kjaer mini-shaker type 4810, DENMARK). Because of
or array to generate a tiny displacement less than the irregular shape of human body, this kind of reflection
mm in the ROI, the echoes with the displacement info mode can solve the limitation of transmit mode. The
are collected by a second or the same transducer and frequency and amplitude of the vibration emitted from
the resulting displacement is estimated using ultrasonic the vibrator is 50 Hz and 1 mm, the shear wave generated
correlation based methods, the one dimensional [10][11]
[9] by the vibration propagates inside soft tissues with speed
or two dimensional localized tissue strain information between 1 m/s to 10 m/s. Ultrasound signals are collected
will be obtained. Transient elastography or remote by a dedicated ultrasound board and recorded into the PC
elastography have broad clinical applications in the area for data analysis through a 12 bite A/D (GAGE CS8227)
such as breast cancer [9], hepatic fibrosis [10] and heart
[1]