The initial study of sonographic contrast agent and second harmonic imaging on HCC;

Objective To study the effects of structural parameters on encapsulated microbubbles' subharmonic characterization and to optimize these parameters to prepare microbubbles suitable for subharmonic imaging.

Objective:Second harmonic imaging is a complement to fundamental imaging as it can improve the diagnosic ability of cardiac tumor especially when the density of tumors is low or when some patients condition for transmitling ultrasound is very poor.

Second harmonic imaging of Sequoia 512 was used to evaluate the contrast effects.

We calculate a second harmonic generation (SHG) of an antiferromagnetic film (AFF) in sandwich structure, where the AFF sandwich between two dielectric layers.

Objective: In order to suppress tissue harmonic in contrast harmonic imaging, a suppression method based on coded pulse technique is explored.

The development of ultrasonic imaging diagnostic technique is mainly introduced and various kinds of ultrasonic imaging diagnostic techniques are mentioned including A-mode,M-mode and B-mode ultrasonic diagnostic techniques,Doppler imaging technique,3D imaging technique and harmonic imaging technique.

In the past 20 years,the imaging technique of ultrasound imaging equipment has made much progress in harmonic imaging,coherent imaging,Doppler imaging and frequency spectra analysis.