SONOGRAPHIC CHARACTERISTIC OF GALLBLADDER POLYPS

Objective: To evaluate ultrasound characteristic imaging of gallbladder polyps. And to compare ultrasound imaging with the results of surgery and histopathologyfor positive diagnosis of gallbladder polyps. Subjects and methods: Study on 32 patients (14 male and 18 female, mean age 43,5±18,5 years) with clinical suggestion, ultrasound imaging of gallbladder polyp, and surgery -histopathology positive diagnosis. Cross-sectional descriptive study, from 5/2014 to 3/2015 at the Hospital of Hue Medical and Pharmacy College. Results: Among of 32 patients, 18 patients (56,2%) had results postoperative histopathology of chronic cholecystitis, 14 patients (43,8%) was the type of polyps and adenoma. Thus the specificitive of ultrasound in diagnosis of gallbladder polyps was 43,75% only. Conclusion: The role of ultrasound in diagnosis of gallbladder polyps is the firstscreening for the other indications and ultimate treatment. Key words: ultrasound imaging, histopathology, gallbladder polyps.

Ultrasound Tomography: Preliminary Result

This paper presents the initial result of an investigation into the application of ultrasonic sensors for a tomographic imaging system. Transmitters and receivers are mounted permanently on the inner part of the vertical flow pipe. To overcome the problems of objects blocking each other, four pairs of sensors are used, mounted around the area of interest, and views from different angles are obtained. The results obtained show that the system is capable of detecting particle flow. Key words: Ultrasound tomography

Effect of αk on Aluminium Trihydroxide Crystallization from Sodium Aluminate Soluntion under Ultrasound

The ultrasound intensification crystallization process of aluminium trihydroxide from seeded sodium aluminate solution is investigated with various αk(the molecule ratio of Na2O/Al2O3). The experiment results indicate that ultrasound intensification can enhance precipitation ratio of seeded sodium aluminate solution, while large αkdoes not good to improvement of the precipitation under ultrasound. When αkis 1.45, 2.0 and 2.5, the precipitation ratio increase 2.5%, 2.0% and 0.9%, respectively under ultrasound intensification. The mechanism of enhancement on precipitation of alumina hydrate is acoustic cavitations that enhance or alter reactions process of aluminate ions, Al (OH)-4. The mass percentage of precipitation production grain size <45μm is increased by 4.3 % under ultrasound intensification with initial αkat 2.0, which is the biggest. Key words: ultrasound; sodium aluminate solution; precipitation; aluminium trihydroxide