基于胸围的管电流调制技术在冠状动脉CT造影应用的可行性探讨

目的：建立以胸围为参考指标调节冠状动脉CT造影（CTA）成像管电流的函数模型,并探讨其个体化管电流调节模型的临床应用的可行性。方法：连续选取68例以自动管电流调节模式扫描的胸部CT病例,建立胸围与管电流之间的函数模型;再应用其建立的胸围-管电流函数模型对另外的连续64例病例进行冠状动脉CTA成像,对图像质量进行评分,并记录噪声值、管电流、辐射剂量等指标。结果：胸围与管电流之间的函数模型以POW函数拟合度最好（R²=0.691,P<0.05）。应用胸围-管电流函数模型冠状动脉CTA成像的平均图像等级评分为（3.38±0.72）分,噪声值为（31.02±3.97）HU,管电流为（390.63±89.30）mA,CTDI_vol为（34.83±10.72）mGy,DLP为（751.67±175.16）mGy·cm。 结论：以胸围为参考指标调节冠状动脉CTA成像管电流方法,能够较好地实现个体化辐射剂量控制,临床应用具有可行性。     

64层CT检测婴幼儿左侧冠状动脉起源于肺动脉

目的 探讨64层CT冠状动脉成像对婴幼儿左冠状动脉起源于肺动脉的诊断价值.方法 回顾性分析10例经手术证实左冠状动脉起源于肺动脉的婴幼儿,年龄5个月～2岁,体重5.5～10.0 kg.CT检查采用回顾性心电门控增强扫描,管电压80 kV,管电流150 mA,球管旋转速度0.35 s/转,层厚0.625 mm,螺距0.2.结果 CT扫描时患儿心率110～150次/分.图像质量均能满足诊断要求,辐射剂量1.11～1.62 mSv.所有患儿均为左侧冠状动脉起源于肺动脉,其中左冠状动脉开口于肺动脉右后窦及左后窦各4例,开口于肺动脉窦远侧右后壁及下壁各1例.结论 64层CT冠状动脉成像可在低辐射剂量条件下准确显示婴幼儿左侧冠状动脉起源于肺动脉的开口及走行.     

在体肝脏3.0T1H-MR波谱匀场及抑水影响因素探讨

Objective To characterize the clinical factors which influence water suppression and auto-shimming line width for liver 3.0 T 1H-MRS.Methods Fifty-seven cases with liver 1H-MR spectroscopy(1H-MRS) were retrospectively studied, including chronic type B hepatitis (n=5), fatty liver (n=14), chronic type B hepatitis combining fatty liver (n=3) and normal situation (n=35).Independent t test was used to characterize the difference of general condition (height, weight, body mass index etc.) between different water suppression effect groups and between different shimming effect groups.Using Chi-square test to analyze whether water suppression rate and auto-shimming line width between fatty liver groups and non-fatty liver exist significance difference .Results By comparing WS ≥90% (n=47)group with WS < 90% (n=10) group, the former showed smaller average height[(164.7±8.0) and (170.5±3.7) cm respectively], weight[(61.8±10.4) and (73.4±5.4) kg respectively], BMI [(22.7±3.2) and (25.2±1.3)kg/m2 respectively]and LW[(17.7±3.7)and(24.6±6.3) Hz respectively]than the latter (t=-3.488,-3.415,-4.002 and-3.327, P < 0.05).By comparing LW 20 Hz (n=41) group with LW 20 Hz (n=16) group, the former showed better water suppression rate [(93.0±2.7)% and (86.1±8.5)% respectively]than the latter(t=3.213,P <0.05), whereas larger weight[(62.2±11.6) and (68.1±6.1)kg respectively]and BMI[(22.8±3.4) and (24.2±1.9)kg/m2 respectively](t=-2.516,-2.024,P <0.05).LW≤20 Hz in the fatty liver and non-fatty liver group was 7/17 and 34/40, respectively (X2=11.347, P < 0.05).WS < 90% in the fatty liver and non-fatty liver group was 10/17 and 0/44, respectively (X2=28.536, P < 0.05) .Conclusion Hepatic steatosis exerts an adverse effect in water suppression and shimming.     

在体肝脏3.0T1H-MR波谱匀场及抑水影响因素探讨

Objective To characterize the clinical factors which influence water suppression and auto-shimming line width for liver 3.0 T 1H-MRS.Methods Fifty-seven cases with liver 1H-MR spectroscopy(1H-MRS) were retrospectively studied, including chronic type B hepatitis (n=5), fatty liver (n=14), chronic type B hepatitis combining fatty liver (n=3) and normal situation (n=35).Independent t test was used to characterize the difference of general condition (height, weight, body mass index etc.) between different water suppression effect groups and between different shimming effect groups.Using Chi-square test to analyze whether water suppression rate and auto-shimming line width between fatty liver groups and non-fatty liver exist significance difference .Results By comparing WS ≥90% (n=47)group with WS < 90% (n=10) group, the former showed smaller average height[(164.7±8.0) and (170.5±3.7) cm respectively], weight[(61.8±10.4) and (73.4±5.4) kg respectively], BMI [(22.7±3.2) and (25.2±1.3)kg/m2 respectively]and LW[(17.7±3.7)and(24.6±6.3) Hz respectively]than the latter (t=-3.488,-3.415,-4.002 and-3.327, P < 0.05).By comparing LW 20 Hz (n=41) group with LW 20 Hz (n=16) group, the former showed better water suppression rate [(93.0±2.7)% and (86.1±8.5)% respectively]than the latter(t=3.213,P <0.05), whereas larger weight[(62.2±11.6) and (68.1±6.1)kg respectively]and BMI[(22.8±3.4) and (24.2±1.9)kg/m2 respectively](t=-2.516,-2.024,P <0.05).LW≤20 Hz in the fatty liver and non-fatty liver group was 7/17 and 34/40, respectively (X2=11.347, P < 0.05).WS < 90% in the fatty liver and non-fatty liver group was 10/17 and 0/44, respectively (X2=28.536, P < 0.05) .Conclusion Hepatic steatosis exerts an adverse effect in water suppression and shimming.     

不同性别肝脏3.0 T质子MRS匀场比较分析

目的 探讨性别因素对在体肝脏3.0 T质子MR波谱预扫描匀场的影响.资料与方法 62名自愿者,使用GE Signa Excite HD 3.0 T超导磁共振扫描仪,8通道腹部相控阵线圈,单体素点分辨波谱(PRESS)序列采集.参数为TR 1500 ms,TE 30 ms,信号平均次数(NSA)64次,感兴趣容积(VOI)2 cm ×2 cm×2 cm.采用SAGE进行后处理分析得到代谢物峰高及峰下面积.以水峰为内参照对脂质峰面积进行标准化.按性别对受检者分组,采用两独立样本的t检验比较两组波谱预扫描线宽,身高,体重,年龄,体重指数(BMI)及肝脏脂质含量是否存在统计学差异.并对BMI和肝脏脂质含量进行相关分析.结果 (1)女性组较男性组匀场效果更好[(16.5±3.1)Hz,(20.3±5.0)Hz,t=3.506,P=0.001];体重[(56.9±10.4)kg,(68.5±8.8)ks,t=-4.744,P<0.000]及身高[(158.2±4.6)cm,(171.1±4.8)cm,t=-10.621,P<0.000]更小;女性较男性组平均BMI未见统计学差异[(22.7±3.5)ks/m2,(23.4±2.8)ks/m2,t=-0.940,P=0.351].年龄未见统计学差异[(38.9 ±13.0)岁,(35.6±13.6)岁,t=-0.937,P=0.354].肝脏脂质含量更少(0.06±0.10,0.20±0.28,t=-2.751,P=0.008).(2)BMI和肝脏脂质含量相关系数为0.348(P=0.006).结论 在BMI及年龄未见统计学差异的前提下,由于肝脏脂质含量较少,女性更容易在预扫描中获得均匀的磁场从而采集获得高分辨可析性MR波谱.     

复杂性先天性心脏病双向Glenn术后血管造影分析

目的 采用血管造影评价复杂性先天性心脏病双向Glenn术后肺动脉发育及相关解剖学变化. 方法 回顾性分析32例复杂性先天性心脏病双向Glenn术后患者血管造影资料,且22例与术前造影资料比较,评价肺动脉发育、上腔静脉-肺动脉吻合口、主动脉侧支血管及并发症等情况. 结果 31例上腔静脉-肺动脉吻合口通畅,1例吻合口狭窄疑血栓形成.28例肺动脉发育良好且左、右肺动脉发育对称,3例单侧肺动脉狭窄,1例肺动脉发育差.1例出现肺动静脉瘘,1例存在胸腔积液.22例双向Glenn手术前后造影比较,左右肺动脉直径和McGoon率变化差异有统计学意义;36.36%(8/22)的主动脉侧支较术前增多.18.75%(6/32)病例术后存在腔静脉侧支血管. 结论血管造影是评价复杂性先天性心脏病双向Glenn术后肺动脉发育及相关解剖学情况的有效手段.     

先天性心脏病旋转右心室造影对比剂注射方案探讨

目的:探讨先天性心脏病旋转右心室造影的对比剂注射技术。方法:对106例先天性心脏病患者行旋转右心室造影。对比剂注射协议为用量2.5mL/kg,最大用量50～55mL;分两段连续注射,前(1.6±0.3)s注射总量的3/5,后(2.0±0.2)s注射余下的2/5。对比剂为370mgI/mL浓度的非离子型对比剂。造影后,分析、评价解剖结构和主要畸形,以显示满意率表示。结果:总满意率为95.28%,其中单心室(SV)、大动脉转位(TGA)、永存动脉干(PTA)满意率为100%,法洛四联征(TOF)满意率为96.15%,肺动脉闭锁(PA)为95.00%,右心室双出口(DORV)为87%,双腔右心室(DCRV)为80.00%,显示不满意的5例均为室间隔缺损(VSD),显示不清。结论:合理优化对比剂注射协议,先天性心脏病旋转右心室造影能够获得满意的解剖结构及主要畸形显示。     

DR-PACS-RIS系统在批量胸部X线体检中的应用

目的探讨DR-PACS-RIS系统在胸部X线体检中的应用价值。方法对150112例胸部体检者的X线胸片资料进行分析,计算日体检工作量、人均体检时间、医师平均每例阅片时间以及存储成本情况。结果日均检查223例,平均每例体检耗时仅1.1分钟,摄片工作时间约4小时,医师平均阅片及报告时间约1分钟/例。日均图像存储成本约1元。工作站具有统计工作量及多种查询功能。结论在体检中心配备DR-PACS-RIS胸片体检系统切实可行,能够收到明显的正面效益。合理优化检查流程可以进一步提高收益。     

在体肝脏3.0T1H-MR波谱匀场及抑水影响因素探讨

Objective To characterize the clinical factors which influence water suppression and auto-shimming line width for liver 3.0 T 1H-MRS.Methods Fifty-seven cases with liver 1H-MR spectroscopy(1H-MRS) were retrospectively studied, including chronic type B hepatitis (n=5), fatty liver (n=14), chronic type B hepatitis combining fatty liver (n=3) and normal situation (n=35).Independent t test was used to characterize the difference of general condition (height, weight, body mass index etc.) between different water suppression effect groups and between different shimming effect groups.Using Chi-square test to analyze whether water suppression rate and auto-shimming line width between fatty liver groups and non-fatty liver exist significance difference .Results By comparing WS ≥90% (n=47)group with WS < 90% (n=10) group, the former showed smaller average height[(164.7±8.0) and (170.5±3.7) cm respectively], weight[(61.8±10.4) and (73.4±5.4) kg respectively], BMI [(22.7±3.2) and (25.2±1.3)kg/m2 respectively]and LW[(17.7±3.7)and(24.6±6.3) Hz respectively]than the latter (t=-3.488,-3.415,-4.002 and-3.327, P < 0.05).By comparing LW 20 Hz (n=41) group with LW 20 Hz (n=16) group, the former showed better water suppression rate [(93.0±2.7)% and (86.1±8.5)% respectively]than the latter(t=3.213,P <0.05), whereas larger weight[(62.2±11.6) and (68.1±6.1)kg respectively]and BMI[(22.8±3.4) and (24.2±1.9)kg/m2 respectively](t=-2.516,-2.024,P <0.05).LW≤20 Hz in the fatty liver and non-fatty liver group was 7/17 and 34/40, respectively (X2=11.347, P < 0.05).WS < 90% in the fatty liver and non-fatty liver group was 10/17 and 0/44, respectively (X2=28.536, P < 0.05) .Conclusion Hepatic steatosis exerts an adverse effect in water suppression and shimming.     

在体肝脏3.0T1H-MR波谱匀场及抑水影响因素探讨

Objective To characterize the clinical factors which influence water suppression and auto-shimming line width for liver 3.0 T 1H-MRS.Methods Fifty-seven cases with liver 1H-MR spectroscopy(1H-MRS) were retrospectively studied, including chronic type B hepatitis (n=5), fatty liver (n=14), chronic type B hepatitis combining fatty liver (n=3) and normal situation (n=35).Independent t test was used to characterize the difference of general condition (height, weight, body mass index etc.) between different water suppression effect groups and between different shimming effect groups.Using Chi-square test to analyze whether water suppression rate and auto-shimming line width between fatty liver groups and non-fatty liver exist significance difference .Results By comparing WS ≥90% (n=47)group with WS < 90% (n=10) group, the former showed smaller average height[(164.7±8.0) and (170.5±3.7) cm respectively], weight[(61.8±10.4) and (73.4±5.4) kg respectively], BMI [(22.7±3.2) and (25.2±1.3)kg/m2 respectively]and LW[(17.7±3.7)and(24.6±6.3) Hz respectively]than the latter (t=-3.488,-3.415,-4.002 and-3.327, P < 0.05).By comparing LW 20 Hz (n=41) group with LW 20 Hz (n=16) group, the former showed better water suppression rate [(93.0±2.7)% and (86.1±8.5)% respectively]than the latter(t=3.213,P <0.05), whereas larger weight[(62.2±11.6) and (68.1±6.1)kg respectively]and BMI[(22.8±3.4) and (24.2±1.9)kg/m2 respectively](t=-2.516,-2.024,P <0.05).LW≤20 Hz in the fatty liver and non-fatty liver group was 7/17 and 34/40, respectively (X2=11.347, P < 0.05).WS < 90% in the fatty liver and non-fatty liver group was 10/17 and 0/44, respectively (X2=28.536, P < 0.05) .Conclusion Hepatic steatosis exerts an adverse effect in water suppression and shimming.