不同管电压及管电流时QCT或MSCT检测对猪椎体骨密度值的影响  

Effect of QCT or MSCT detection under different tube voltages and currents on the bone density values of porcine vertebral bodies

作　　者：李彦 焦俊 黄震 朱丽 管竹春 陆舜钦 王璐[1] LI Yan;JIAO Jun;HUANG Zhen;ZHU Li;GUAN Zhuchun;LU Shunqin;WANG Lu(Department of Radiology,Anshun People's Hospital,Anshun 561000,Guizhou,China;Department of Radiology,the Affiliated Hospital of Guizhou Medical University,Guiyang 550004,Guizhou,China)

机构地区：[1]安顺市人民医院放射科,贵州安顺561000 [2]贵州医科大学附属医院放射科,贵州贵阳550004

出　　处：《贵州医科大学学报》2024年第5期735-739,共5页Journal of Guizhou Medical University

基　　金：安顺市科技计划项目(安市科社〔2023〕21)。

摘　　要：目的比较不同管电压及管电流条件下,定量计算机投照技术(QCT)和多层螺旋CT(MSCT)对猪脊柱椎体骨密度(BMD)值的影响。方法自制离体成年猪脊柱(L1~L3)标本模型1个,在管电压80、100、120及140 kV时,分别对应逐渐增加管电流20、40、60~260 mA·s,采用MSCT和QCT对家猪椎体体模进行扫描,获取BMD值,并进行比较。结果固定管电流逐步增大管电压扫描,MSCT在L1~L3检测时获得的BMD值比较,差异均有统计学意义(P<0.001),而QCT检测获得的BMD比较,差异无统计学意义(P>0.05);与管电压80 kV比较,100、120及140 kV条件下,MSCT检测获得的BMD比较、差异有统计学意义(P<0.001),而QCT检测获得的BMD值比较差异无统计学意义(P>0.05);固定管电压、逐步增大管电流扫描,MSCT和QCT各组间BMD均较为恒定,差异无统计学意义(P>0.05);在各扫描条件下,MSCT测量值低于QCT,差异具有统计学意义(P<0.01)。结论改变管电压,QCT测得BMD值无显著变化,BMD测量结果相对稳定,而MSCT测得BMD值变化显著。Objective To compare the effects of quantitative computed tomography(QCT)and multi-slice spiral computed tomography(MSCT)on bone mineral density(BMD)value of porcine spinal vertebrae under different tube voltages and currents.Methods An ex vivo model of adult porcine spine(L1-L3)was homemade.Under tube voltages of 80,100,120,120,and 140 kV,corresponding to the gradual increase of tube currents by 20,40,60-260 mA·s,respectively,MSCT,and QCT were performed to scan the ex vivo model of adult porcine spine to obtain BMD values and compare them.Results Under fixing tube current but gradually increasing tube voltage,there was significant difference in BMD value detected by MSCT scanning of L1-L3(P<0.001),while there was no significant difference in BMD value detected by QCT scanning(P>0.05).When compared with the tube voltage of 80 kV,there were statistically significant differences in BMD values detected by MSCT under the conditions of 100,120,and 140 kV(P<0.001),while there were no significant differences in BMD values detected QCT(P>0.05).BMD values detected by MSCT scanning and QCT scanning were relatively constant under fixed tube voltages and gradually increased tube currents,and the difference was not statistically significant(P>0.05).Under various scanning conditions,MSCT measurement values were lower than QCT measurement values(P<0.01).Conclusion Changing tube voltage has no significant effect on BMD values measured by QCT,and BMD results measured by QCT are relatively stable,while BMD values measured by MSCT are significantly changed.

关 键 词：多层螺旋CT 定量计算机断层照相术 猪体模 骨密度 低剂量 

分 类 号：R445.4[医药卫生—影像医学与核医学]