Non-enhanced Low-tube-voltage High-pitch Dual-source Computed Tomography with Sinogram Affirmed Iterative Reconstruction Algorithm of the Abdomen and Pelvis

Objective To investigate the image quality, radiation dose and diagnostic value of the low-tube-voltage high-pitch dual-source computed tomography(DSCT) with sinogram affirmed iterative reconstruction(SAFIRE) for non-enhanced abdominal and pelvic scans. Methods This institutional review board-approved prospective study included 64 patients who gave written informed consent for additional abdominal and pelvic scan with DSCT in the period from November to December 2012. The patients underwent standard non-enhanced CT scans(protocol 1) [tube voltage of 120 k Vp/pitch of 0.9/filtered back-projection(FBP) reconstruction] followed by high-pitch non-enhanced CT scans(protocol 2)(100 k Vp/3.0/SAFIRE). The total scan time, mean CT number, signal-to-noise ratio(SNR), image quality, lesion detectability and radiation dose were compared between the two protocols. Results The total scan time of protocol 2 was significantly shorter than that of protocol 1(1.4±0.1 seconds vs. 7.6±0.6 seconds, P<0.001). There was no significant difference between protocol 1 and protocol 2 in mean CT number of all organs(liver, 55.4±6.3 HU vs. 56.1±6.8 HU, P=0.214; pancreas, 43.6±5.9 HU vs. 43.7±5.8 HU, P=0.785; spleen, 47.9±3.9 HU vs. 49.4±4.3 HU, P=0.128; kidney, 32.2±2.3 HU vs. 33.1±2.3 HU, P=0.367; abdominal aorta, 44.8±5.6 HU vs. 45.0±5.5 HU, P=0.499; psoas muscle, 50.7±4.1 HU vs. 50.3±4.5 HU, P=0.279). SNR on images of protocol 2 was higher than that of protocol 1(liver, 5.0±1.2 vs. 4.5±1.1, P<0.001; pancreas, 4.0±1.0 vs. 3.6±0.8, P<0.001; spleen, 4.7±1.0 vs. 4.1±0.9, P<0.001; kidney, 3.1±0.6 vs. 2.8±0.6, P<0.001; abdominal aorta, 4.1±1.0 vs. 3.8±1.0, P<0.001; psoas muscle, 4.5±1.1 vs. 4.3±1.2, P=0.012). The overall image noise of protocol 2 was lower than that of protocol1(9.8±3.1 HU vs. 11.1±3.0 HU, P<0.001). Image quality of protocol 2 was good but lower than that of protocol 1(4.1±0.7 vs. 4.6±0.5, P<0.001). Protocol 2 perceived 229 of 234 lesions(97.9%) that were detected in protocol 1 in the abdomen and pelvis. Radiation dose of protocol 2 was lower than that of protocol 1(4.4±0.4 m Sv vs. 7.3±2.4 m Sv, P<0.001) and the mean dose reduction was 41.4%. Conclusion The high-pitch DSCT with SAFIRE can shorten scan time and reduce radiation dose while preserving image quality in non-enhanced abdominal and pelvic scans.

Truncus arteriosus:Diagnosis with dual-source computed tomography angiography and low radiation dose

Truncus arteriosus is an uncommon congenital cardiac abnormality which is characterized by a single arterial trunk origin from the heart that supplies both the systemic,pulmonary and coronary circulation.We present a preterm newborn female patient with type 2 truncusarteriosus,left superior vena cava and aberrant subclavian artery diagnosed with low dose dual-source cardiac computed tomography(CT).We discuss that low dose dual-source cardiac CT has more advantages than other imaging methods and it is an important modality for assessment of patients with conotruncal anomalies such as truncusarteriosus.

Assessment of Intracardiac and Extracardiac Deformities in Patients with Various Types of Pulmonary Atresia by Dual-Source Computed Tomography

Background:Pulmonary atresia(PA)is a group of heterogeneous complex congenital heart disease.Only one study modality might not get a correct diagnosis.This study aims to investigate the diagnostic power of dualsource computed tomography(DSCT)for all intracardiac and extracardiac deformities in patients with PA compared with transthoracic echocardiography(TTE).Materials and Methods:This retrospective study enrolled 79 patients and divided them into three groups according to their main diagnosis.All associated malformations and clinical information,including treatments,were recorded and compared among the three groups.The diagnostic power of DSCT and TTE on all associated malformations were compared.The surgical index(McGoon ratio,pulmonary arterials index(PAI),and total neopulmonary arterial index)and radiation dose were calculated on the basis of DSCT.Results:Of the patients,32,30,and 17 were divided into the groups of PA with ventricular septal defect(VSD),PA with VSD and major aortopulmonary collateral arteries,and PA with other major malformations,respectively.Consequently,182,162,and 13 intracardiac,extracardiac,and other major malformations were diagnosed,respectively.Moreover,DSCT showed a better diagnostic performance in extracardiac deformities(154 vs.117,p<0.001),whereas TTE could diagnose intracardiac deformities better(159 vs.139,p=0.001).The McGoon ratio,PAI,and treatment methods were significantly different among the three groups(p=0.014,p=0.008,and p=0.018,respectively).Conclusion:More than one imaging modality should be used to make a correct diagnosis when clinically suspecting PA.DSCT is superior to TTE in diagnosing extracardiac deformities and could be used to roughly calculate surgical indices to optimize treatment strategy.

Dose Efficiency in Dual Source High-Pitch Computed Tomography of the Chest

Objectives: Evaluation of radiation efficiency of dual source high-pitch (DSHP) chest CT in comparison to single source technique with special regards to individual patient anatomy. Methods: 150 consecutive patients who underwent chest CT with automated tube current modulation were evaluated retrospectively and divided into three study groups, each with an equal quantity of 50 patients (DSHP vs. single source 128 slices vs. single source 16 slices). By using a dedicated workstation, volumetric analyses of each of the scanned anatomic area were performed and correlated to the individual dose length product (DLP). The calculated result was defined as dose efficiency. Results: DLP was 203 mGycm (DSHP), vs. 269 mGycm (single source) vs. 273 mGycm (16 slice CT). The total patient volume was lowest in the dual source group with 18956.3 cm3 (vs. 22481.2 cm3 vs. 22133.8 cm3). With regards to the DLP, the calculated dose efficiency of dual source CT was better than the 128 slice CT (p = 0.045) and the 16 slice CT (p < 0.01). Conclusions: DSHP CT has considerably better dose efficiency compared to 16 slice CT. Compared to 128 slice single source technique, the high-pitch mode does not cause any dose penalty when performing chest CT.

Feasibility and Diagnostic Accuracy for Assessment of Coronary Artery Stenosis of Prospectively Electrocardiogram-gated High-pitch Spiral Acquisition Mode Dual-source CT Coronary Angiography in Patients with Relatively Higher Heart Rates: in Comparison wit

Objective To prospectively investigate the diagnostic accuracy for coronary artery stenosis of prospectively electrocardiogram-triggered spiral acquisition mode (high pitch mode) dual-source computed tomography coronary angiography (CTCA) in patients with relatively higher heart rates (HR) compared with catheter coronary angiography (CCA). Methods Forty-seven consecutive patients with relatively higher HR (>65 and <100 bpm) (20 male, 27 female; age 55±10 years) who both underwent dual-source CTCA and CCA were prospectively included in this study. All patients were performed CTCA using high pitch mode setting at 20%-30% of the R-R interval for the image acquisition. All coronary segments were evaluated by two blinded and independent observers with regard to image quality on a three-point scale (1: excellent to 3: non-diagnostic) and for the presence of significant coronary stenoses (defined as diameter narrowing exceeding 50%). Considered CCA as the standard of reference, the sensitivity, specificity, positive predictive value and negative predictive value were calculated. Radiation dose values were calculated using the dose-length product. Results Image quality was rated as being score 1 in 92.4% of segments, score 2 in 6.1% of segmentsand score 3 in 1.5% of segments. The average image quality score per segment was 1.064±0.306. The HR variability of patients with image score 1, 2 and 3 were 2.29±1.06 bpm, 5.17±1.37 bpm, 8.88±1.53 bpm, respectively. The average HR variability of patients with different image scores were significantly different (F=170.402, P=0.001). The sensitivity, specificity, positive and negative predictive values were 92.6%, 97.0%, 87.6%, 98.3%, respectively, per segment and 90.0%, 95.2%, 85.3%, 96.9%, respectively, per vessel and 100%, 63.6%, 90.0%, 100%, respectively, per patient. The effective radiation dose was on average 0.86±0.16 mSv. Conclusion In patients with HR more than 65 bpm and below 100 bpm without cardiac arrhythmia, the prospectively electrocardiogram-gated high-pitch spiral acquisition mode with image acquired timing set at 20%-30% of the R-R interval provides a high diagnostic accuracy for the assessment of coronary stenoses combined with a 1.5% of non-diagnostic coronary segments and a radiation dose below 1 mSv.

Intravenous Contrast Material Administration at High-pitch Dual-source CT Coronary Angiography: Bolus-tracking Technique with Shortened Time of Respiratory Instruction Versus Test Bolus Technique

Objective To investigate the feasibility of acquiring the similar homogeneous enhancement using bolus-tracking techniques with shortened respiratory time in prospectively electrocardiogram-gated high-pitch spiral acquisition mode (Flash mode) coronary computed tomography angiography (CCTA) compared with test bolus technique. Methods One hundred and eighty-four consecutive patients with mean heart rate ≤65 beats per minute undergoing CCTA were prospectively included in this study. The patients were randomly divided into two groups. Patients in the group A (n=92) instructed to shorten respiratory time received CCTA using bolus-tracking technique with high-pitch spiral acquisition mode (Flash mode), while those in the group B (n=92) underwent CCTA with test bolus technique. The attenuation in the ascending aorta, image noise, contrast-to-noise ratio and radiation doses of the two groups were assessed. Results There were no significant differences in the mean attenuation values in the ascending aorta (483.18±59.07 HU vs. 498.7±83.51 HU, P=0.183), image noise (21.4±4.5 HU vs. 20.9±4.3 HU, P=0.414), contrast-to-noise ratio (12.1±4.2 vs. 13.8±5.1, P=0.31) between the groups A and B. There were no significant differences in the radiation dose of dynamic monitoring scans (0.056±0.026 mSv vs. 0.062±0.018 mSv, P=0.068) and radiation dose of angiography (0.94±0.07 mSv vs. 0.96±0.15 mSv,P=0.926) between the two groups, while 15 mL less contrast material volume was administered in the group A than the group B. Conclusion Bolus-tracking technique with shortened time of respiratory in Flash mode of dual-source CT yields the similar homogeneous enhancement with less contrast material in comparison to the test bolus technique.

Diagnostic Value of Prospective Electrocardiogram-triggered Dual-source Computed Tomography Angiography for Infants and Children with Interrupted Aortic Arch

Background：Accurate assessment of intra-as well as extra-cardiac malformations and radiation dosage concerns are especially crucial to infants and children with interrupted aortic arch （IAA）.The purpose of this study is to investigate the value of prospective electrocardiogram （ECG）-triggered dual-source computed tomography （DSCT） angiography with low-dosage techniques in the diagnosis of IAA.Methods：Thirteen patients with suspected IAA underwent prospective ECG-triggered DSCT scan and transthoracic echocardiography （TTE）.Surgery was performed on all the patients.A five-point scale was used to assess image quality.The diagnostic accuracy ofDSCT angiography and TTE was compared with the surgical findings as the reference standard.A nonparametric Chi-square test was used for comparative analysis.P＜0.05 was considered as a significant difference.The mean effective radiation dose （ED） was calculated.Results：Diagnostic DSCT images were obtained for all the patients.Thirteen IAA cases with 60 separate cardiovascular anomalies were confirmed by surgical findings.The diagnostic accuracy of TTE and DSCT for total cardiovascular malformations was 93.7％ and 97.9％ （P＞0.05）,and that for extra-cardiac vascular malformations was 92.3％ and 99.0％ （P ＜ 0.05）,respectively.The mean score of image quality was 3.77 ± 0.83.The mean ED was 0.30 ± 0.04 mSv （range from 0.23 mSv to 0.39 mSv）.Conclusions：In infants and children with IAA,prospective ECG-triggered DSCT with low radiation exposure and high diagnostic efficiency has higher accuracy compared to TTE in detection of extra-cardiac vascular anomalies.

国人内听道DSCT的解剖研究

目的应用双源CT(dual source computed tomography,DSCT)观察国人内听道的形态,并测量内听道各径线数值,探讨其临床应用价值。方法对正常志愿者402例804耳行颞骨薄层扫描,多平面重建,观察内听道的形态,并对各相关径线进行测量。结果内听道形态为平行管状699耳,喇叭口状53耳,壶腹状50耳,不规则型2耳。内听道长度为(9.810±1.830)mm,内听道底管径为(5.084±0.739)mm×(3.246±0.613)mm,中段管径为(5.044±0.956)mm×(4.228±0.791)mm,内耳门区前后径为(5.049±1.05)mm,内耳门区上下径为(5.657±1.196)mm。两侧内听道各测量数值统计学上无显著差异;男女之间有统计学差异,这与文献报道不同;部分年龄组之间也有统计学差异。结论DSCT薄层扫描后多平面重建可清楚显示内听道的形态,并能精确测量内听道的管径及长度,对活体解剖测量具有指导意义,为临床和影像检查提供诊断依据。

DSCT在左心室功能评估中的初步研究

目的初步探讨DSCT评估左心功能的准确性.方法14例健康者和32例冠心病患者在24h同时进行DSCT和超声心动图检查,对比DSCT与超声测量值的相关性.结果DSCT与超声心动图测量结果相关性良好.结论DSCT冠状动脉造影检查所得到的左心室数据准确性高,无呼吸运动伪影、成像时间短,可用于临床诊断.

Computed tomography angiography-guided percutaneous coronary intervention in chronic total occlusion

Objective： The aim of this study is to investigate if dual-source computed tomography （DSCT） could guide the percutaneous coronary intervention （PCI） of chronic total occlusion （CTO）. Methods： We enrolled patients who were confirmed to have at least one native coronary artery CTO by DSCT before they underwent selective PCI in the period from December 2007 to October 2008. A CTO was defined as an obstruction of a native coronary artery with no luminal continuity. The CT-guided PCI procedure involved placing CT and fluoroscopic images side-by-side on the screen. DSCT images were analyzed for location, segment, plaque characteristics, calcification, and proximal lumen diameter of the CTO before PCI. The guidewire was advanced and manipulated under CT guidance. The PCI was carried out and the results were compared. Results： Seventy-four CTOs were assessed. PCI was successful in 57 cases of CTOs （77.0%）. According to the results, CTOs were divided into two groups： successfuI-PCI and failed-PCI. All coronary artery paths of CTOs were clearly recognized by DSCT. In the successfuI-PCI group, soft plaques were detected much more often than those in the failed-PCI group, but fibrous and calcified plaques were seen more often in the failed-PCI group. Calcification severity in CTO segments showed a significant difference between the groups （P=0.014）. Calcified plaques were detected in 20 （35.1%） lesions in the successfuI-PCI group. More than 70% of the failures were calcified plaques, of which there were two arc-calcified and one circular-calcified lesions. Occlusions were longer in the failed-PCI group than those in the successfuI-PCI group [（38.8±25.0） vs. （18.0±15.3） mm, respec- tively, P〈0.01]. Fewer guidewires were used in the successfuI-PCI group compared with the failed-PCI group （1.7±1.0 vs. 2.5±0.9, respectively, P〈0.01）. The logistic regression analysis indicated that predictors of recanalization of CTOs included occlusion length （P=-0.0035, risk ratio （RR）=0.93） and calcification severity （P=0.05, RR=0.27）. Multi-linear trends analysis showed that the factors affecting procedural time were CTO location （P=-0.0141） and occlusion length （P=0.0035）. Conclusions： DSCT could delineate the path of CTOs and characterize plaques. The outcomes of PCI were related to thrombolysis in myocardial infarction （TIMI） flow grade, CTO characteristics, severity of calcified plaques and the length of occlusive segments. Occlusion length and calcification severity were independent predictors of CTOs. Occlusion length and CTO segments could also help to estimate the duration of interventional procedures.

双源CT与超声心动图定量评价冠心病左心功能的比较研究

目的:以超声心动图为对照标准,探讨双源CT定量评价左心功能的可行性和准确性及其优势。方法:选取2011年1月～6月冠心病患者58例,其中合并II型糖尿病患者29例。全部病例于3天内行心脏双源CT及超声心动图检查。比较双源CT与超声心动图所测得的左心功能各参数。结果:双源CT和超声心动图所测左心功能各指标EDV、ESV、SV、EF相关性高(r=0.702～0.898),差异无统计学意义(P>0.05)。两种方法所测冠心病合并II型糖尿病组左心功能指标EDV、ESV值均较非糖尿病组测值高,EF值较低,差异均有统计学意义(P<0.05)。结论:两种方法评价左心功能相关性好,双源CT是一种评价左心功能准确可行的方法,一次冠状动脉造影所获得的数据,不但可评价左心功能,还可评价冠脉狭窄情况,无需额外增加对比剂和辐射剂量。

双源CT在左心室功能测定中的临床应用价值

目的初步探讨双源CT(DSCT)评估左心功能的准确性。方法12例健康者和30例冠心病患者在24h同时进行DSCT和超声心动图检查,对比DSCT与超声测量值的相关性;对冠心病患者的冠状动脉狭窄程度和左室心肌质量(LVMM)、LVEF进行统计学分析并与临床资料对照。结果DSCT与超声心动图测量结果相关性良好;LVMM与临床证实的心肌缺血发生率呈正相关,LVEF与临床证实的心肌缺血发生率呈负相关。结论DSCT冠状动脉造影检查所得到的左心室数据准确性高,无呼吸运动伪影,成像时间短,可用于临床诊断,左心室功能分析能同时显示冠状动脉狭窄程度和心脏功能改变,在冠心病急性心肌梗死风险预测中具有很大意义。

双源CT血管重建对胰腺癌可切除性的评估作用

目的探讨胰腺癌术前双源CT血管重建评估对手术可切除性及根治性切除率(R0切除)的影响。方法随机抽取我院2011年1月至2014年12月间行双源CT平扫+增强+血管重建后手术治疗的胰腺癌患者49例,设定为重建组(胰头癌29例,胰体尾癌20例);另随机选取我院2007年1月至2010年12月间行常规CT平扫+增强后手术治疗的55例胰腺癌患者设定为非重建组(胰头癌33例,胰体尾癌22例),分析两组的可切除率(所有入组病例均已排除远端转移和周围脏器浸润);对两组手术切除的患者进一步行R0切除率比较。结果就胰头癌而言,重建组手术切除率和阴性切缘率分别为82.8%(24/29)和87.5%(21/24),均显著高于非重建组63.6%(21/33)和76.2%(16/21)(x^2=22.41和15.73,P=0.001和0.002);对于胰体尾癌,重建组手术切除率和R0切除率分别为90%(18/20)和88.9%(16/18),均显著高于非重建组77.3%(17/22)和76.5%(13/17)(x2=13.1和12.56,P=0.004和0.01)。结论术前双源CT血管重建能够显著提高胰腺癌手术切除率和R0切除率,值得进一步临床推广。

双源CT血管成像诊断成人先天性冠状动脉起源变异及畸形的价值

目的:探讨双源CT血管成像(DSCTA)诊断成人先天性冠状动脉起源变异及畸形的价值。方法:803例疑冠心病患者行DSCTA,回顾性分析146例154支先天性冠状动脉起源变异及畸形的表现。结果:803例患者中,共检出成人先天性冠状动脉起源变异及畸形146例154支冠状动脉。动脉圆锥支单独开口于右冠窦118例。开口高位20例,其中左冠主干开口高位18例,包括左冠主干开口于左冠窦嵴8例,左冠主干开口于左冠窦嵴上10例;RCA开口于右冠窦嵴上2例。RCA起源于左冠窦5例及左冠窦嵴上3例,其中4例并走行异常,即开口异常的RCA走行于主动脉与肺动脉之间。LCX起源于右冠窦2例,并走行于左心房与主动脉之间。LCX单独开口于左冠窦1例。3例为2支冠状动脉起源异常,均有动脉圆锥支单独开口于右冠窦,2例合并左冠主干开口于左冠窦嵴上,1例合并左冠主干开口于右冠窦。1例为3支冠状动脉起源异常,动脉圆锥支单独开口于右冠窦合并左、右冠状动脉分别开口于左、右冠窦嵴上。结论:双源CT冠状动脉成像综合各种后处理技术是目前诊断成人先天性冠状动脉起源变异及畸形最有用的无创性检查。

64层双源螺旋CT原理

介绍了64层双源螺旋CT概念,分析了其组成和特点,说明了其对冠状狭窄性病变性质鉴别的独特优势,并对双源螺旋CT成像原理及其双能量减影成像原理进行了详尽阐述,展示了其广阔的应用前景。

低管电流技术在双源CT“双低”冠状动脉CT血管成像中的应用研究

目的:探讨双源CT(DSCT)低管电压结合不同管电流在冠状动脉CT血管成像(CTCA)中的应用。方法:回顾性分析168例行DSCT检查冠状动脉的受检者CTCA图像资料,按照X射线管的管电流和重建技术,根据X射线管A管不同管电流将受检者分为4组,180 mAs组(37例)、150 mAs组(39例)、120 mAs组(44例)和90 mAs组(48例)。比较4组受检者平均CT值、图像噪声、信号噪声比(SNR)、对比噪声比(CNR)和图像质量主观评分,以及容积CT剂量指数(CTDI_(vol))、剂量长度乘积(DLP)和有效辐射剂量(ERD)。结果:4组受检者冠状动脉段数显示率基本一致,且图像质量评分和平均CT值差异无统计学意义(x2=1.371,P>0.05);但4组受检者图像质量平均分值、图像噪声、SNR、CNR、CTDI_(vol)、DLP和ERD比较,差异有统计学意义(F=2.772,F=4.374,F=4.151,F=4.007,F=28.746,F=19.835,F=41.126;P<0.05);180 mAs组和90 mAs组受检者图像质量优于150 mAs组和120 mAs组;90 mAs组图像SD高于150 mAs组和120 mAs组,90 mAs组图像SNR和CNR低于150 mAs组和120 mAs组,差异有统计学意义(t=2.238,t=2.353;t=2.652,t=2.703;t=2.425,t=2.498;P<0.05);90 mAs组受检者的CTDI_(vol)、DLP及ERD均低于其他3组,差异有统计学意义(t=4.998,t=3.716,t=5.002;t=4.673,t=2.999,t=3.876;t=2.811,t=2.064,t=3.141;P<0.05)。结论:双源CT低管电压结合90 mAs低管电流既可获得高质量图像,又可以降低辐射剂量。

双源CT评估高血压与冠脉斑块相关性的价值研究

目的:利用双源CT血管成像技术(DSCTCA)探讨高血压与冠脉粥样硬化斑块两者的关系。方法:收集我院2014年4月至2015年8月检查冠状动脉DSCTA患者的病例,分为高血压组(n=150)和非高血压组(n=150),其中高血压组又根据脉压差分为两组:1组,高脉压组pp≥60 mm Hg(n=90);2组,低脉压组pp<60 mm Hg(n=60)共150例。观察两组冠脉病变的发生、分布、狭窄程度及斑块类型,分析其相关性。结果:高血压组发生3支及以上冠脉病变的概率为61.7%,非高血压组为45.3%,高血压组冠脉斑块总数比率为28%,非高血压组为19.2%,两组比较有显著差异(P<0.05))。高血压组与非高血压组狭窄程度的构成无显著差异。高血压高脉压组重度狭窄、完全闭塞的比例分别为8.6%、3.7%,低脉压组分别为4.4%、0.8%,两组之间差异有统计学意义(P<0.05)。高血压组混合斑块的发生率为54.5%,非高血压组为43.0%,非钙化斑块的发生率,高血压组为40.6%,非高血压组为50.7%,两组比较差异均有统计学意义;高血压高脉压组混合斑块的发生率为57.5%,低脉压组为49.1%,两组比较差异亦有统计学意义。结论:冠脉DSCTA可以较准确评估高血压与冠脉病变之间的关系。高血压患者的冠脉病变人数,三支及以上病变支数、斑块总数较非高血压者明显增高,混合斑块发生率更高。高脉压组较低脉压组冠脉狭窄程度更加严重。

双源CT评估胃癌肿瘤血管生成及其与膜联蛋白A和血清组织多肽特异性抗原的关系研究

目的:探讨分析双源CT(DSCT)评估胃癌肿瘤血管生成及其与膜联蛋白A(AnnexinA)和血清组织多肽特异性抗原(TPS)的关系。方法:选取医院收治的380例胃癌患者,根据微血管密度中位数35个/视野为界定标准,将其中206例微血管密度中位数>35个/视野的患者纳入高密度组,将174例微血管密度中位数<35个/视野的患者纳入低密度组,比较两组DSCT成像参数,Annexin A和TPS水平;采用Peason相关性分析法评估DSCT各项成像参数与Annexin A和TPS的相关性。结果:高密度组患者血容量(BV)、血流量(BF)及表面通透性(PS)水平及达峰时间(TTP)高于低密度组,差异有统计学意义(t=5.942,t=8.901,t=14.945,t=12.513;P<0.05),但平均通过时间(MTT)水平高于低密度组,差异无统计学意义;高密度组血清AnnexinA和TPS水平均显著高于低密度组患者,差异有统计学意义(t=5.371,t=5.223;P<0.05);DSCT中BV、BF及PS与Annexin A和TPS呈正相关(rAnnexin A=0.621,r=0.652,r=0.492;rTPS=0.716,r=0.823,r=0.512;P<0.05);DSCT中TTP与Annexin A和TPS呈负相关(r=-0.572,r=-0.548;P<0.05)。结论:DSCT可准确、有效地评估肿瘤血管生成,且其参数与Annexin A和TPS具有较好相关性,对于肿瘤活性评估具有较好参考价值,可作为胃癌早期诊断的重要指导依据。

双源CT诊断非金属可疑食管异物的队列研究

目的通过分析双源CT诊断非金属食管异物的敏感性和特异性,评价双源CT对非金属可疑食管异物的诊断意义。方法应用前瞻性队列研究,选取2015年1月1日~2016年12月31日符合纳入标准的患者153例双源CT和正侧位平片对照。结果 93例双源CT阳性示食管异物,其中57例平片阳性;内镜检查证实并取出92例,内镜检查阴性1例。本组病例中双源CT敏感性100%(92/92),特异性98.4%(60/61),阴性预测值100%(60/60)。结论双源CT检查非金属食管异物敏感性、特异性、阴性预测值高,能明确异物类型及异物位置。双源CT可作为非金属食管异物的常规检查,及时诊断,避免不必要的食管内镜检查。

双源CT在主动脉瓣置换术前左心功能评价中的应用

目的:以磁共振成像(MRI)为金标准,用双源CT(DSCT)定量评价左心功能,探讨DSCT在主动脉瓣置换术前左心功能评价中的应用价值。方法:选取临床诊断主动脉瓣病变欲行主动脉瓣置换术的患者21例,全部病例均行DSCT和MRI心功能分析检查。由有经验的2位放射科医生独立进行,结果以均数±标准差表示。两种仪器间测量值应用配对样本t检验及相关分析检验,同一仪器测量值的差异相互关系用组内相关系数描述,P<0.05为有统计学意义。结果:DSCT和MRI两种方法测量的心功能指标差异无统计学意义,舒张末期容积(EDV)、收缩末期容积(ESV)、每搏输出量(SV)、左室射血分数(EF)相关性高,r值(EDV)=0.93,r值(ESV)=0.94,r值(SV)=0.89,r值(EF)=0.85。EDV均值:DSCT>MRI;ESV均值:DSCT>MRI;SV均值:DSCT>MRI;EF均值:DSCT>MRI。同一仪器三次测量值的差异相互关系(ICC值):MRI测量的EDV、ESV、SV、EF值的ICC值在0.8～1之间;DSCT测量的EDV、ESV、SV、EF值的ICC值在0.6～0.75之间。结论:DSCT在左心室收缩功能定量评价方面准确、可靠,重复性好,并可在不增加放射剂量的前提下,一次DSCT冠状动脉造影检查同时评估冠状动脉狭窄情况和左心室收缩功能,能够为临床主动脉瓣置换术前评估及制订手术方案提供更多重要的参考信息。