64层螺旋CT血管成像对主动脉粥样硬化穿透性溃疡的应用价值

目的　探讨64层螺旋CT血管成像（64-MSCTA）在穿透性粥样硬化性主动脉溃疡（PAU）中应用价值。方法　14例PAU均进行了64-MSCTA胸腹联合检查，将原始数据在工作站进行MPR、CPR、MIP及VR等后处理。结果　14例患者CT横轴位原始图像、MPR图像均能很好显示PAU的部位、数目、大小、深度、形态及并发症（包括壁内血肿、假性动脉瘤及主动脉破裂）。　MIP及VR图像可任意角度立体显示主动脉全程轮廓、钙化斑块及溃疡形态。结论　主动脉MSCTA是诊断主动脉粥样硬化穿透性溃疡准确、快捷、有效的首选检查方法，对指导临床治疗具有的很重要的意义。     

64排螺旋CT肺部后处理重建技术在非肺癌性结节诊断中的应用研究

目的探讨64排胸部螺旋CT后处理重建技术在非肺癌性肺结节中诊断的作用。方法回顾性分析我院2016年1～12月期间经手术病理确诊的78例肺原位腺癌患者和45例非肺癌患者的64排螺旋CT肺部后处理重建影像资料,比较和总结两者的影像学特征。结果 (1)非肺癌患者肺部CT后处理重建影像以实性结节多见,周围不规则、边缘毛刺征、血管丛集征和空泡征等少见,纵隔窗显示、病灶钙化和病灶强化等多见。肺原位腺癌患者则以磨玻璃结节多见,周围不规则、边缘毛刺征、血管丛集征和空泡征等多见,未见纵隔窗显示、病灶钙化和病灶强化等,两者在上述影像学特征方面存在显著性差异(P0.01)。(2)两组在周围花瓣征和胸膜凹陷征等影像学表现方面无显著性差异(P0.05)。结论 64排螺旋肺部CT后处理重建技术能更清晰地了解肺小结节的细微影像改变,对判断小结节性质提供了更多的影像学依据,如能进一步与临床资料结合分析,则能有效提高肺结节诊治的临床决策水平。     

多层螺旋CT后处理技术对人工听骨链重建术前听骨链完整性的诊断价值分析

目的研究多层螺旋CT(MSCT)后处理技术对中耳炎患者人工听骨链重建术前听骨链完整性的诊断价值。方法选取2015年10月至2018年10月我院人工听骨链重建术前行MSCT检查的慢性或胆脂瘤中耳炎患者74例临床资料进行回顾性分析,所有患者均完成MSCT检查和手术治疗,将扫描数据进行多平面重组(MPR)、仿真内窥镜(VE)及容积重现(VR)等重建处理,并以手术结果为金标准分析三种处理技术对听骨链各部位完整性的术前诊断价值。结果 MPR、VE及VR对锤骨和砧骨畸形诊断准确性大致相近,均显示出良好准确性,其中VR对锤骨颈准确率优于MPR,对锤骨头准确率优于VE;同时MPR对砧镫关节和镫上畸形诊断效果较VE和VR具有一定优势。结论MPR、VE及VR均为常用MSCT后期处理技术,用于慢性中耳炎患者听骨链术前完整性评估均具有良好价值,在常规图像基础上结合多种后期处理技术可提升诊断准确率。     

Analysis of deep inferior epigastric perforator (DIEP) arteries by using MDCTA: Comparison between 2 post-processing techniques

Purpose

Our purpose was to compare two post-processing techniques, Maximum-Intensity-Projection (MIP) and Volume Rendering (VR) for the study of perforator arteries.

Methods

Thirty patients who underwent Multi-Detector-Row CT Angiography (MDCTA) between February 2010 and May 2010 were retrospectively analyzed. For each patient and for each reconstruction method, the image quality was evaluated and the inter- and intra-observer agreement was calculated according to the Cohen statistics. The Hounsfield Unit (HU) value in the common femoral artery was quantified and the correlation (Pearson Statistic) between image quality and HU value was explored.

Results

The Pearson r between the right and left common femoral artery was excellent (r = 0.955). The highest image quality score was obtained using MIP for both observers (total value 75, with a mean value 2.67 for observer 1 and total value of 79 and a mean value of 2.82 for observer 2). The highest agreement between the two observers was detected using the MIP protocol with a Cohen kappa value of 0.856. The ROC area under the curve (Az) for the VR is 0.786 (0.086 SD; p value = 0.0009) whereas the ROC area under the curve (Az) for the MIP is 0.0928 (0.051 SD; p value = 0.0001).

Conclusion

MIP showed the optimal inter- and intra-observer agreement and the highest quality scores and therefore should be used as post-processing techniques in the analysis of perforating arteries.     

Image quality of Gd-EOB-DTPA-enhanced magnetic resonance imaging of the liver using dual-source parallel radiofrequency transmission technology: Comparison with the post-processing correction method for B1 inhomogeneity-induced signal loss

Purpose

To evaluate the efficacy of the dual-source parallel radiofrequency system (DS system) for gadolinium ethoxybenzyl diethylenetriamine pentaacetic acid-enhanced magnetic resonance imaging (Gd-EOB-MRI).

Materials and methods

Twenty-six subjects with liver diseases underwent hepatobiliary phase imaging of Gd-EOB-MRI using either the DS system or a single-source radiofrequency system with or without body-tuned CLEAR, which is a post-processing correction method of B1 inhomogeneity-induced signal loss (SSBTC+ and SSBTC−, respectively). The left and right lobes of the liver were separately assessed. Qualitatively, the homogeneity of signal intensity distribution was scored using a 3-point scale. Quantitatively, lesion-to-liver and spleen-to-liver contrast ratios (CRs) were calculated. The scores and CRs were compared among the three techniques by two-way analysis of variance and Tukey's Honestly Significant Difference post hoc test. Values of p < 0.05 were considered statistically significant for each analysis.

Results

The DS system showed a significantly better score in the left lobe of the liver, and higher lesion-to-liver and spleen-to-liver CRs in the left and right lobes of the liver, compared with SSBTC+ or SSBTC− (p < 0.05). The DS system and SSBTC− showed no significant differences in scores in the right lobe of the liver but they showed significantly better scores than SSBTC+ (p < 0.05).

Conclusion

The DS system is more advantageous to improve the homogeneity of signal intensity distribution and tissue contrast of Gd-EOB-MRI than the post-processing correction method independently of the site.     

Rinsing postprocessing procedure of a 3D-printed orthodontic appliance material: Impact of alternative post-rinsing solutions on the roughness,flexural strength and cytotoxicity

ObjectiveThe present study evaluated the effect of different rinsing postprocessing solutions on surface characteristics, flexural strength, and cytotoxicity of an additive manufactured polymer for orthodontic appliances. These solutions have been deemed an alternative to the standard isopropanol which is a flammable liquid, known to have toxic effects.MethodsTested specimens were manufactured using direct light processing of an orthodontic appliance polymer (FREEPRINT® splint 2.0, Detax) and post-processed with different post-rinsing solutions, including isopropanol (IPA), ethanol (EtOH), EASY 3D Cleaner (EYC), Yellow Magic7 (YM7), and RESINAWAY (RAY), respectively. All groups were post-cured following the manufacturer’s instructions. Surface topography and roughness (Ra and Rv) were evaluated. In addition, flexural strength was measured by a three-point bending test. An extract test was performed to evaluate cytotoxicity. The data were analyzed by the Kruskal-Wallis test with Dunn's multiple comparisons test (p < 0.05).ResultsVarious post-rinsing solutions did not significantly affect the roughness values (Ra and Rv). Specimens post-processed with EtOH (98.1 ± 12.4 MPa) and EYC (101.1 ± 6.3 MPa) exhibited significantly lower flexural strength compared to the groups of IPA (110.7 ± 5.3 MPa), RAY (112.1 ± 5.6 MPa) and YM7 (117.3 ± 5.9 MPa), respectively. Finally, there were no cytotoxic effects of parts cleaned with different post-rinsing solutions.SignificanceConsidering the use of 3D-printed orthodontic appliance materials, different rinsing postprocessing procedures did not affect surface characteristics. However, the flexural strength was significantly influenced, which could be attributed to the chemical ingredients of the post-rinsing solutions. Various post-rinsing treatments had no alternation concerning cytocompatibility.     

多层螺旋CT重建技术在周围型肺癌诊断中的价值

目的探讨多层螺旋CT三种后处理技术在周围型小肺癌诊断中的运用价值。方法收集经病理证实的67例周围型小肺癌患者的MSCT扫描及MPR、SSD、VR重建图像并进行分析。结果MPR重建在显示周围型小肺癌五项主要征象上敏感性均高于横断面薄层扫描（P〈0．05）;SVR重建在显示周围型小肺癌四项主要征象上敏感性均高于横断面薄层扫描（P〈0．05）,SVR重建无法显示空泡征;SSD重建在显示周围型小肺癌四项主要征象上敏感性均高于横断面薄层扫描（P〈0．05）.结论周围型小肺癌不同的图像后处理技术在显示肺肿瘤重要征象上各有一定的优势,如普通薄层CT无法清晰显示所需要的影像,可选择一定的重建技术协助诊断。     

64层螺旋CT在肋骨骨折诊断中的应用价值

目的探讨64层螺旋CT各种后处理技术在肋骨骨折诊断中的应用价值。方法对108例胸部外伤患者先行胸部正位及双斜位DR检查,再行64层螺旋CT容积扫描,将全部数据传送到随机工作站,采取多平面重建(MPR)、曲面重建(CPR)、最大密度投影(MIP)及容积再现(VR)等后处理技术,了解有无骨折及骨折情况,并对各项检查结果对比分析。结果 MPR或CPR对隐匿性骨折,细小骨折,尤其是不全骨折显示较好;MIP对肋软骨骨折显示较好;VR对有重叠,移位的骨折显示好,定位准确;各种方法联合应用可显著提高肋骨骨折诊断正确率。结论 64层螺旋CT后处理技术对胸部外伤肋骨骨折诊断有重要的临床价值。     

64层螺旋CT后处理技术对肋骨骨折的诊断价值

目的探讨64层螺旋CT容积扫描及后处理技术在诊断肋骨骨折中的临床应用及价值。方法临床高度怀疑肋骨骨折的100例胸部外伤患者,行64层螺旋CT容积扫描,比较轴位扫描图像与后处理图像对肋骨骨折的检出率。结果 100例患者中,CT轴位图像诊断肋骨骨折96例426处;后处理图像诊断肋骨骨折99例588处;2周后复查CT图像确诊肋骨骨折100例600处。以患者2周后复查CT图像为标准,CT轴位图像诊断肋骨骨折数量的检出率为71%;后处理图像诊断肋骨骨折数量的检出率为98%。结论 64层螺旋CT后处理技术能够多层面显示肋骨结构,对肋骨骨折的检出率明显高于CT轴位扫描图像,且具有定位容易和骨折显示明确等优势。