计算正常肝实质与肝转移瘤CT值的差值作为正常肝实质与肝转移瘤的对比(tumor-liver contrast,TLC),正常肝实质、肝转移瘤、主动脉的CNR根据以下公式计算:主动脉CNR=(CT值主动脉-CT值竖脊肌)/噪声,正常肝实质CNR=(CT值正常肝实质-CT...
参考文献: [1] Yi Y, Zhao X M, Wu R Z, et al. Low Dose and Low Contrast Medium Coronary CT Angiography Using Dual-Layer Spectral Detector CT[J]. Int Heart J,2019,60(3):608-617. [2] Hickethier T, Baessler B, Kroeger J R, et al. Monoenergetic reconstructions for imaging of co...
3. 冠状动脉CT血管成像(coronary CT angiography,CCTA)适应证:(1)无症状的高危风险人群(尤其是可能存在非钙化斑块的患者)行CCTA进行冠心病筛查可能受益;高危风险人群包括糖尿病、获得性免疫缺陷综合征、吸烟、早发心血管病家族史、炎症性疾病(例如系统...
参考文献: [1] Yi Y, Zhao X M, Wu R Z, et al. Low Dose and Low Contrast Medium Coronary CT Angiography Using Dual-Layer Spectral Detector CT[J]. Int Heart J,2019,60(3):608-617. [2] Hickethier T, Baessler B, Kroeger J R, et al. Monoenergetic reconstructions for imaging of co...
CT增强 (Computed Tomography Contrast) ❁ 指用高压注射器经静脉注入水溶性有机碘剂,血管内碘浓度增高后,与周围组织形成密度差,从而使病变显影更为清楚 CT血管造影(CT angiography,CTA) ❁是将CT增强技术与薄层、大范围、快速扫描技术相结合,通过合理的后处理,清晰显示全身各部位血管细节 ...
注:CCTA为冠状动脉CTA(Coronary CT Angiography) CT的优势及不足:CT具有空间分辨率高、成像速度快、覆盖范围大,处理后可进行任意切面的多平面成像和三维成像的特点,所以是显示心脏和大血管解剖的最佳方法,主要用于心血管疾病的解剖学评价。 CT的不足在于检查具有放射性,需要使用碘对比剂(碘过敏和肾功能不全为禁忌证...
[1] Yi Y, Zhao X M, Wu R Z, et al. Low Dose and Low Contrast Medium Coronary CT Angiography Using Dual-Layer Spectral Detector CT[J]. Int Heart J,2019,60(3):608-617. [2] Hickethier T, Baessler B, Kroeger J R, et al. Monoenergetic reconstructions for imaging of coronary arter...
来自Radiology的一篇:CT Angiography of the Aorta: Contrast Timing byUsing a Fixed versus a Patient-specific Trigger Delay 笔者只总结了几个重点: 1.扫描时间是CT血管造影中实现良好和均匀对比增强的重要和决定性变量。考虑到现代CT扫描仪的扫描持续时间较短、低千伏扫描的广泛使用(由于碘的k边缘)以及患者特定参...
recurrent chest pain after myocardial revascularization is a common postoperative presentation.4The long-term clinical outcome after surgery is dependent on the patency of the bypass grafts and the progression of native coronary artery disease.5-7Conventional coronary angiography is traditionally used to ...
The radiation dose and the amount of contrast media are the limitation of coronary CT angiography (CTCA). Low dose protocol of contrast media using 80kV has not been elucidated. We compared the radiation dose and image quality of the ultra-low dose protocol using 80kV and standard protocol ...