中国医学影像学杂志
中國醫學影像學雜誌
중국의학영상학잡지
CHINESE JOURNAL OF MEDICAL IMAGING
2013年
12期
916-919
,共4页
陈世林%陈鑫%钟丽珊%刘再毅%梁长虹
陳世林%陳鑫%鐘麗珊%劉再毅%樑長虹
진세림%진흠%종려산%류재의%량장홍
肝脏%磁共振成像,弥散%扩散加权成像%表观扩散系数%可重复性,结果
肝髒%磁共振成像,瀰散%擴散加權成像%錶觀擴散繫數%可重複性,結果
간장%자공진성상,미산%확산가권성상%표관확산계수%가중복성,결과
Liver%Diffusion magnetic resonance imaging%Diffusion weighted imaging%Apparent diffusion coefficient%Reproducibility of results
目的探讨两种1.5T MRI仪对肝扩散加权成像（DWI）表观扩散系数（ADC）及其可重复性的影响。资料与方法使用两台不同的1.5T MRI仪（Siemens Espree和Philips Achieva），设置相同的序列和参数分别对两组正常志愿者（各33例）进行两次肝DWI扫描（b=0、800 s/mm2）。选取左、右肝中间连续3层ADC图测量ADC值，分别在左、右肝放置2个大小一致的感兴趣区测量ADC值，采用Bland-Altman法评价两种机器ADC值测量的可重复性。结果 Siemens MRI仪测得的左、右肝ADC值均高于Philips MRI仪测得值（t=2.045~2.713, P<0.05）；每种机器所测得左肝ADC值大于右肝（t=-10.561~-7.263, P<0.001）；Bland-Altman结果显示，两种机型测得左、右肝ADC值的可重复性相似，且右肝的可重复性均较左肝好，其中Siemens MRI仪测得左、右肝ADC值的一致性分别为16.65%、7.55%，Philips MRI仪测得左、右肝的一致性分别为16.30%、7.85%。结论不同MRI仪对ADC值的测量有一定的影响，但可重复性相似。临床比较ADC值时应该充分考虑机型的影响。
目的探討兩種1.5T MRI儀對肝擴散加權成像（DWI）錶觀擴散繫數（ADC）及其可重複性的影響。資料與方法使用兩檯不同的1.5T MRI儀（Siemens Espree和Philips Achieva），設置相同的序列和參數分彆對兩組正常誌願者（各33例）進行兩次肝DWI掃描（b=0、800 s/mm2）。選取左、右肝中間連續3層ADC圖測量ADC值，分彆在左、右肝放置2箇大小一緻的感興趣區測量ADC值，採用Bland-Altman法評價兩種機器ADC值測量的可重複性。結果 Siemens MRI儀測得的左、右肝ADC值均高于Philips MRI儀測得值（t=2.045~2.713, P<0.05）；每種機器所測得左肝ADC值大于右肝（t=-10.561~-7.263, P<0.001）；Bland-Altman結果顯示，兩種機型測得左、右肝ADC值的可重複性相似，且右肝的可重複性均較左肝好，其中Siemens MRI儀測得左、右肝ADC值的一緻性分彆為16.65%、7.55%，Philips MRI儀測得左、右肝的一緻性分彆為16.30%、7.85%。結論不同MRI儀對ADC值的測量有一定的影響，但可重複性相似。臨床比較ADC值時應該充分攷慮機型的影響。
목적탐토량충1.5T MRI의대간확산가권성상（DWI）표관확산계수（ADC）급기가중복성적영향。자료여방법사용량태불동적1.5T MRI의（Siemens Espree화Philips Achieva），설치상동적서렬화삼수분별대량조정상지원자（각33례）진행량차간DWI소묘（b=0、800 s/mm2）。선취좌、우간중간련속3층ADC도측량ADC치，분별재좌、우간방치2개대소일치적감흥취구측량ADC치，채용Bland-Altman법평개량충궤기ADC치측량적가중복성。결과 Siemens MRI의측득적좌、우간ADC치균고우Philips MRI의측득치（t=2.045~2.713, P<0.05）；매충궤기소측득좌간ADC치대우우간（t=-10.561~-7.263, P<0.001）；Bland-Altman결과현시，량충궤형측득좌、우간ADC치적가중복성상사，차우간적가중복성균교좌간호，기중Siemens MRI의측득좌、우간ADC치적일치성분별위16.65%、7.55%，Philips MRI의측득좌、우간적일치성분별위16.30%、7.85%。결론불동MRI의대ADC치적측량유일정적영향，단가중복성상사。림상비교ADC치시응해충분고필궤형적영향。
Purpose To investigate the effect of two different 1.5T MRI scanners on the apparent diffusion coefficient (ADC) measurement and its reproducibility in diffusion weighted imaging (DWI) of the liver. Materials and Methods Two groups of volunteers (33 people in each group) underwent liver DWI examination twice by using the same DWI sequence with b value of 0 and 800 s/mm2 on different MRI scanners (1.5T Siemens Espree and 1.5T Philips Achieva). On ADC maps, two region of interests were placed on three central slices of the left and right liver lobes, respectively. The ADC measurements of six region of interests on left and right liver lobes were averaged to represent the mean ADC values of the left and right liver lobe, respectively. The reproducibility of the ADC measurements was assessed by Bland-Altman method. Results The ADC values of the left and right liver lobes measured on Siemens MRI scanner were significantly higher than those on Philips MRI scanner (t=2.045-2.713, P<0.05); on both scanners, the ADC values of the left liver lobe were significantly higher than those of the right liver lobe (t=-10.561--7.263, P<0.001). The Bland-Altman results showed that the reproducibility of ADC measurement was similar on both MRI scanners, and both displayed higher reproducibility of right liver lobe than that of left liver lobe (on Siemens MRI scanner: the agreement were 16.65% and 7.55% for the left and right liver lobe, respectively;and on Philips MRI scanner:16.30%and 7.85%, respectively. Conclusion Different MRI scanners may have influence on ADC values, but does not affect its reproducibility. Therefore, when ADC values obtained on different MR scanners are compared in clinical analysis, this influence should be considered.
