Ultrasonographic features and its clinical significance of retroperitoneal malignant lymph nodes;

Syudy of imaging characteristics of pancreatic carcinoma and ampullary carcinoma in EUS;

[Objective] To study EUS imaging characteristics of pancreatic carcinoma and ampullary carcinoma and evaluate the diagnosis value of EUS.

【Objective】 To discuss the imaging characteristics and diagnostic value of transvaginal color ultra-sound in earlier ectopic pregnancy.

Objective: To analyze the ultrasonic feature in different dialectical type of chronic pelvic inflammatory disease.

However,by applying gyro-positioning technique to locate artificial magnetic field,the ultrasound imaging produced by measurement processing,where AC(Alternating Current) signal is induced by rotated coils in the artificial magnetic field as the triggering signal for image scanning,can quickly and accurately ascertain the fault.

To heighten the frame rate of ultrasound imaging system,the thesis focused on the dual beamformation technique and its hardware implementation was introduced.

Employing the impulse response model of ultrasound transducer and the modulating-demodulating principle of FM signal,the simulation for ultrasound imaging is carried out.