磁共振波谱技术的质量控制和应用要点
磁共振波谱学；半高宽；质量控制,,磁共振波谱学；半高宽；质量控制,【摘要】,【关键词】,1资料与方法,2结果,3讨论,【参考文献】
【摘要】 目的 观察波谱空间定位和扫描参数对图像质量的影响，并初步小结应用要点。方法 对65例头颅检查的受检者行磁共振波谱扫描，有目的地改变感兴趣区域(ROI)的位置、大小和其他参数设置(FOV、频率矩阵、相位矩阵、预饱和带等)，记录预扫描后系统显示的半高宽、水抑制程度等数值，并对扫描后显示的图像质量进行初步评价，探讨这些数值与波谱质量之间的关系。结果 65例患者中有60例波谱谱线形态较好，代谢物峰值位置正常；5例谱线形态变形，波峰漂移较大。记录的结果数据中：半高宽5～23，水抑制级别92～99。谱线形态较好的60例中，半高宽均在系统提示的范围内；5例谱线差的半高宽为7、9、16和23，水抑制级别为95、96、97。结论 获得高质量的波谱，需要较高的磁场均匀度，而半高宽是反映均匀度的一个重要指标。只有尽一切技术手段使得半高宽在系统提示的范围之内，才有可能获得好的谱线。【关键词】 磁共振波谱学；半高宽；质量控制
Quality control and main techniques in MRS technology
CHEN Jian,WANG Wei,HE Ling,et al.Center for Medical Imageology,The First Peoples Hospital of Yangzhou,Yangzhou 225001,China
【Abstract】 Objective To explore the effects on images from the space location of spectrum and scanning parameters,and summarize the technological essential and application hints.Methods 65 patients were scanned in brain with magnetic resonance spectroscopy,the location and the size of region of interesting (ROI) and other scanning parameters values (FOV,frequency matrix,phase matrix,saturate cingulum,etc.) were changed intentionally,the values of full width at half maxium and water suppression lever were recorded.A preliminary evaluation of the resulted waves and the relationship between the parameters data and the quality of the MRS waves were probed.Results Of the 65 cases,60 were with better shape of wave lines and metabolite peak positions,5 with aberrant lines and shifted peaks.Among the recorded data: the range of full width at half maxium value was 5～23,water suppression level was 92～99.In the 60-case group,all those full width at half maxium values were in the given range of the system,on the contrast,in the 5-case group full width at half maxium values were 7,9,16 and 23,and water suppression levels were 95,96,97.Conclusion High-quality wave spectrum depends on high uniformity of magnetic field.The value of full width at half maxium is an important factor that reflects the uniformity of magnetic field.Good wave spectrum lines only could be acquired with all those techniques which ensure the value of full width at half maxium to be within the given range of the system. ......
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