Research of the influences on the electromagnetic fields by the pelvic tissues in the design of the radio frequency coils / 生物医学工程学杂志

In the present study, the effect of the electromagnetic field, induced by radio frequency (RF) coils and coupled with the pelvic tissues, was calculated with the method of finite difference time domain (FDTD). Using the established electromagnetic model of human pelvis region, the simulation was implemented. The imaging uniformity was quantitatively calculated and scaled with the values of the percentage image uniformity (PIU). The electromagnetic model was derived from the anatomical data of human pelvic region and loaded into the simulation. The results showed that the homogeneity of the magnetic fields was severely damaged due to the coupling between the RF coil and the human tissues when loaded with the human pelvis in the Birdcage RF coils at 3T. The research results set a basis meaningful for the design of RF coils.

Decoupling of multi-channel RF coil and its application in the intraoperative MRI / 生物医学工程学杂志

The coupling from different elements of the multi-channel coil leads to the splitting of the resonance frequency and deviation from the Lamor frequency. Decoupling between different elements is the key technology in the design of the radiofrequency (RF) coil. The electrical decoupling circuits should vary with different arrangements of the elements. A novel method of decoupling for the RF coil used in the intraoperative MR-guided focused ultrasound system is reported in the paper. The prototype RF coil was made according to the proposed decoupling method. The bench test of the prototype showed that the performance of the decoupling of the coil was excellent. The images in vivo were acquired with the designed prototype RF coil.

Design and application of Pharmic Information Consulting System / 医疗卫生装备

Purpose To develop the Pharmic Information Consulting System and apply it to clinic or outpatient department so that doctors can consult the pharmic information quickly.Method Based on PowerBuider9.0 and the net in our sanatorium,a standard and practical pharmic information list was made by using Oracle7.3 database software.Result With this system the following functions can be available including pharmic information management,pharmic information retrieving,new medicine information provision,hospital information provision,adverse drug reactions announcement,pharmic education,etc.This system is a very useful tool for pharmaceutists,doctors even nurses.Pharmaceutists can use it to collect,save and classify pharmic information.Doctors can use it to consult the pharmic information quickly.Conclusion Using net service mode,this system shows such characteristics as speediness,exactness,adjustability and expandability.It is fit for the service of pharmic information and is valuable to be popularizd.