CAJ | 학술논문

目的:探讨正常成人扩散加权成像(DWI)时,不同b值对脑组织灰白质对比、信号强度和表观扩散系数(ADC)值的影响.方法:随即选择20例正常成人作为研究对象进行DWI技术检查.DWI扫描序列依次为:①TR/TE/激励次数为8284ms/106.0ms/1次,扩散敏感系数(b值)为500s/mm 2,一次扫描时间相应为40s;②TR/TE/激励次数为8284ms/112.8ms/1次, b值为800s/mm2,一次扫描时间为49s;③TR/TE/激励次数为6817ms/116.5ms/1次,b值为1000s/mm 2,一次扫描时间为40s;④TR/TE/激励次数为7647ms/133.1ms/2次,b值为2000s/mm 2,一次扫描时间为1min 8s;⑤TR/TE/激励次数为8284ms/145.8ms/4次,b值为3000s/mm 2,一次扫描时间为2min 4s.结果:ADC值随b值升高而降低.当b值小于1000 s/mm2时,DWI上灰白质信号的对比与T2WI上相似,灰质信号高于白质;b值为 1000～2000 s/mm2时,灰白质信号对比大致相等;b值为3000s/mm 2时,灰白质信号对比倒置,图像信噪比下降.结论: b值对扩散加权成像技术有重要影响,不同b值时正常成人脑组织信号强度和ADC值不同.
목적:탐토정상성인확산가권성상(DWI)시,불동b치대뇌조직회백질대비、신호강도화표관확산계수(ADC)치적영향.방법:수즉선택20례정상성인작위연구대상진행DWI기술검사.DWI소묘서렬의차위:①TR/TE/격려차수위8284ms/106.0ms/1차,확산민감계수(b치)위500s/mm 2,일차소묘시간상응위40s;②TR/TE/격려차수위8284ms/112.8ms/1차, b치위800s/mm2,일차소묘시간위49s;③TR/TE/격려차수위6817ms/116.5ms/1차,b치위1000s/mm 2,일차소묘시간위40s;④TR/TE/격려차수위7647ms/133.1ms/2차,b치위2000s/mm 2,일차소묘시간위1min 8s;⑤TR/TE/격려차수위8284ms/145.8ms/4차,b치위3000s/mm 2,일차소묘시간위2min 4s.결과:ADC치수b치승고이강저.당b치소우1000 s/mm2시,DWI상회백질신호적대비여T2WI상상사,회질신호고우백질;b치위 1000～2000 s/mm2시,회백질신호대비대치상등;b치위3000s/mm 2시,회백질신호대비도치,도상신조비하강.결론: b치대확산가권성상기술유중요영향,불동b치시정상성인뇌조직신호강도화ADC치불동.