[MRI in orthopedics: diagnosis of joint disorders].
For the visualization of joint structures, magnetic resonance imaging (MRI) has definite advantages over other imaging modalities. High soft tissue contrast and multiplanar capabilities contribute to adequate representation of the joints. With surface and special coils as well as high gradient field strengths, superior spatial resolution can be achieved, thus allowing for depiction of fine anatomical details. Newly developed pulse sequences, especially with fat suppression techniques and utilization of paramagnetic contrast agents (gadolinium complexes) have improved image contrast. Examination techniques, results and diagnostic value of MRI in various joints are discussed. Close cooperation between orthopaedic surgeons and radiologists is mandatory for effective and economically acceptable use of MRI in the diagnosis of joint disorders.
With study on field geology,geochemistry and geomathematics for the Zhuanmiao borate deposit,it is concluded that the borate mineralization within the studied area underwent two epochs,i.e.sedimentation and metamorphic migmatizaiton,implying its sedimentary-metamorphic type of deposit. The ore bodies in general dip to west. The NNE-orientated faults in the ore field are reverse occurrence with dip angles less than 40°. Consequently,three large-sized concealed deposits were discovered within the lower walls of the faults,marking a breakthrough in the exploration for borate deposits in the area.