Objective: With the clinical application and popularization of magnetic resonance equipment, the installed amount of 3.0T high field magnetic resonance in the hospital was gradually increasing. This paper summarized the various technical factors involved in the installation of 3.0T high field MRI, and provided scientific and valuable reference for the installation and management of high field magnetic resonance equipment. Methods: During the installed process of GE discovery 3.0T magnetic resonance, to explore the correlative relationship among series of preparation work about installation of magnetic resonance, such as the selection of machine room, civil construction, shield construction and related electrical facilities and so on, and complete the connecting work among them. Results: Finally, the hospital has successfully completed machine room preparation for the 3.0T magnetic resonance, and has provided site guarantee for obtaining high-quality magnetic resonance images. Conclusion: In view of the special, importance and higher requirement for machine room of the magnetic resonance equipment, the seriously research and analysis should be applied and a coordinated mechanism of various type work should be established before the equipment is installed. During the construction process of machine room, enough consideration for detail in every aspect can provide guarantee for completing high-quality construction during the scheduled period, and achieve a satisfying effect.

ObjectiveTo evaluate the clinical outcome of endoscope-assisted combined anterior and posterior procedures for grade-Ⅲ and Ⅳspondylolisthesis.MethodsFrom December 2007 to May 2010,13 patients with grade-Ⅲ and Ⅳ spondylolisthesis were treated with two bilateral decompression,percutaneous pedicle screw restoration,intervertebral bone grafting and plate fixation using microendoscopic discectomy and laparoscopy,including 6 males and 7 females with an average age of 39.8 years(range,18-58 years).Eleven cases were in grade Ⅲ spondylolisthesis and two in Ⅳ.The lesion location was as follows:2 cases were at L4,5 and 11 at L5S1.The clinical outcomes were evaluated according to Oswestry disability questionnaire,and the change of radiographic data including slipping degree,slipping angle and posterior height of intervertebral disc.ResultsThe mean follow-up time was 21 months (range,12-36 months).The mean operative time was 125 min,with a mean blood loss of 415 ml.Slipping degree decreased 56.9％ in average (from preoperative 73.3％±6.1％ to postoperative 16.4％±9.5％),slipping angle decreased 19.6°(from preoperative 27.7°±5.6° to postoperative 8.1°±8.8°),posterior height of intervertebral disc increased 7.1 mm (from preoperative 2.6 ±0.8 mm to postoperative 9.7 ±3.7 mm).The clinical outcomes of the Oswestry disability questionnaire decreased 19.5 (from preoperative 35.8±5.7 to postoperative 16.3±5.2).CT scans demonstrated that solid bony fusion could be obtained in one year after operation.Complications included dural sac tears in 1 case,and superficial incision infection in 1.The results were excellent in 4 cases,good in 8 and fair in 1.ConclusionEndoscope-assisted anterior and posterior procedures for grade-Ⅲ and Ⅳ spondylolisthesis is a reliable method,which can lead to rigid fixation and fusion,and also can achieve thorough decompression and restoration as much as possible.