Objective To evaluate the clinical value of myocardial perfusion imaging with dual-source dual-energy CT and a contrast agent at a low concentration in the diagnosis of myocardial infarction in the elderly.Methods One...Objective To evaluate the clinical value of myocardial perfusion imaging with dual-source dual-energy CT and a contrast agent at a low concentration in the diagnosis of myocardial infarction in the elderly.Methods Onestop cardiac imaging with dual-source CT was conducted in 138 elderly patients diagnosed with myocardial infarction between October 2015 and May 2016.The展开更多
AIM: To evaluate the image quality of hepatic multidetector computed tomography(MDCT) with dynamic contrast enhancement. METHODS: It uses iodixanol 270 mg/m L(Visipaque 270) and 80 kVp acquisitions reconstructed with ...AIM: To evaluate the image quality of hepatic multidetector computed tomography(MDCT) with dynamic contrast enhancement. METHODS: It uses iodixanol 270 mg/m L(Visipaque 270) and 80 kVp acquisitions reconstructed with sinogram affirmed iterative reconstruction(SAFIRE?) in comparison with a standard MDCT protocol. Fiftythree consecutive patients with known or suspected hepatocellular carcinoma underwent 55 CT examinations, with two different four-phase CT protocols. The first group of 30 patients underwent a standard 120 kVp acquisition after injection of Iohexol 350 mg/m L(Accupaque 350~?) and reconstructed with filtered back projection. The second group of 25 patients underwent a dual-energy CT at 80-140 kVp with iodixanol 270. The 80 kVp component of the second group was reconstructed iteratively(SAFIRE?-Siemens). All hyperdense and hypodense hepatic lesions ≥ 5 mm were identified with both protocols. Aorta and portal vessels/liver parenchyma contrast to noise ratio(CNR) in arterial phase, hypervascular lesion/liver parenchyma CNR in arterial phase, hypodense lesion/liver parenchyma CNR in portal and late phase were calculated in both groups.RESULTS: Aorta/liver and focal lesions altogether/liver CNR were higher for the second protocol(P = 0.0078 and 0.0346). Hypervascular lesions/liver CNR was not statistically different(P = 0.86). Hypodense lesion/liver CNR in the portal phase was significantly higher for the second group(P = 0.0107). Hypodense lesion/liver CNR in the late phase was the same for both groups(P = 0.9926).CONCLUSION: MDCT imaging with 80 kVp with iterative reconstruction and iodixanol 270 yields equal or even better image quality.展开更多
目的探讨64排螺旋CT低浓度对比剂在颈部血管成像(CTA)扫描中的应用价值。方法选取2014年1月至2015年11月柳州市人民医院的108例颈部CTA检查患者,随机分成A、B、C组,每组36例。A组给予高浓度对比剂碘普罗胺(370mg I/m L),120 k V;B、C组...目的探讨64排螺旋CT低浓度对比剂在颈部血管成像(CTA)扫描中的应用价值。方法选取2014年1月至2015年11月柳州市人民医院的108例颈部CTA检查患者,随机分成A、B、C组,每组36例。A组给予高浓度对比剂碘普罗胺(370mg I/m L),120 k V;B、C组分别给予低浓度对比剂碘佛醇(320 mg I/m L)、碘海醇(300 mg I/m L),100 k V,3组均给予50 m L对比剂,根据原始图像及重组图像进行综合性分析。结果所有受检者均顺利完成检查。3组病例的主动脉、颈总动脉、基底动脉、舌动脉均清晰显示,动脉造影剂浓度维持在较高水平,A组主动脉CT值(338.40±78.80)HU,颈总动脉CT值(392.85±74.03)HU,基底动脉CT值(311.77±55.11)HU,舌动脉CT值(320.05±54.32)HU;B组主动脉CT值(297.15±67.59)HU,颈总动脉CT值(363.40±71.93)HU,基底动脉CT值(280.25±43.46)HU,舌动脉CT值(292.12±46.33)HU;C组主动脉CT值(280.19±66.77)HU,颈总动脉CT值(351.64±75.38)HU,基底动脉CT值(277.41±45.22)HU,舌动脉CT值(287.35±49.35)HU。A组CT值稍高于B、C组,但差异无统计学意义(P>0.05);重组图像质量评分,A组为(4.53±0.38)分,B组(4.41±0.34)分,C组(4.42±0.29)分,3组评分比较差异无统计学意义(P>0.05)。结论 64排螺旋CT颈部CTA使用低浓度对比剂可获得较好的图像质量,可满足临床需要。展开更多
目的探讨颈部CTA检查中进行64排CT "双低"扫描模式的应用研究。方法方便选择2015年6月—2016年2月来该院进行颈部CTA检查者90例,根据随机数字表法分为对照组和观察组,每组45例,观察组进行64排CT"双低"扫描模式,300 ...目的探讨颈部CTA检查中进行64排CT "双低"扫描模式的应用研究。方法方便选择2015年6月—2016年2月来该院进行颈部CTA检查者90例,根据随机数字表法分为对照组和观察组,每组45例,观察组进行64排CT"双低"扫描模式,300 mgI/mL碘海醇对比剂,100 k V管电压,对照组进行常规64排CT扫描模式,即350 mgI/mL碘海醇对比剂,120 k V管电压,由两名资质较高的影像科医师评价图像质量,比较两组的对比噪声比(CNR)、信噪比(SNR)、噪声、CT值等临床指标情况;比较两组的颈部动脉血管1分节段、2分节段、3分节段、4分节段的图像质量情况。结果观察组的对比噪声比(CNR)、信噪比(SNR)、噪声、CT值等临床指标情况分别为(40.2±6.3)、(40.6±7.9)、(9.1±2.3)、(388.6±40.3)HU,对照组分别为(58.9±10.8)、(69.7±15.7)、(7.4±0.5)、(490.8±60.2)HU,差异有统计学意义(t=10.03,11.11,4.85,9.46,P<0.05);而观察组与对照组的颈部动脉血管1分节段、2分节段、3分节段、4分节段的图像质量比较,差异无统计学意义(P>0.05)。结论颈部CTA检查中应用64排CT"双低"扫描模式可显著降低患者所受的碘总量和辐射剂量,同时可获得较佳的图像质量。展开更多
文摘Objective To evaluate the clinical value of myocardial perfusion imaging with dual-source dual-energy CT and a contrast agent at a low concentration in the diagnosis of myocardial infarction in the elderly.Methods Onestop cardiac imaging with dual-source CT was conducted in 138 elderly patients diagnosed with myocardial infarction between October 2015 and May 2016.The
文摘AIM: To evaluate the image quality of hepatic multidetector computed tomography(MDCT) with dynamic contrast enhancement. METHODS: It uses iodixanol 270 mg/m L(Visipaque 270) and 80 kVp acquisitions reconstructed with sinogram affirmed iterative reconstruction(SAFIRE?) in comparison with a standard MDCT protocol. Fiftythree consecutive patients with known or suspected hepatocellular carcinoma underwent 55 CT examinations, with two different four-phase CT protocols. The first group of 30 patients underwent a standard 120 kVp acquisition after injection of Iohexol 350 mg/m L(Accupaque 350~?) and reconstructed with filtered back projection. The second group of 25 patients underwent a dual-energy CT at 80-140 kVp with iodixanol 270. The 80 kVp component of the second group was reconstructed iteratively(SAFIRE?-Siemens). All hyperdense and hypodense hepatic lesions ≥ 5 mm were identified with both protocols. Aorta and portal vessels/liver parenchyma contrast to noise ratio(CNR) in arterial phase, hypervascular lesion/liver parenchyma CNR in arterial phase, hypodense lesion/liver parenchyma CNR in portal and late phase were calculated in both groups.RESULTS: Aorta/liver and focal lesions altogether/liver CNR were higher for the second protocol(P = 0.0078 and 0.0346). Hypervascular lesions/liver CNR was not statistically different(P = 0.86). Hypodense lesion/liver CNR in the portal phase was significantly higher for the second group(P = 0.0107). Hypodense lesion/liver CNR in the late phase was the same for both groups(P = 0.9926).CONCLUSION: MDCT imaging with 80 kVp with iterative reconstruction and iodixanol 270 yields equal or even better image quality.
文摘目的探讨颈部CTA检查中进行64排CT "双低"扫描模式的应用研究。方法方便选择2015年6月—2016年2月来该院进行颈部CTA检查者90例,根据随机数字表法分为对照组和观察组,每组45例,观察组进行64排CT"双低"扫描模式,300 mgI/mL碘海醇对比剂,100 k V管电压,对照组进行常规64排CT扫描模式,即350 mgI/mL碘海醇对比剂,120 k V管电压,由两名资质较高的影像科医师评价图像质量,比较两组的对比噪声比(CNR)、信噪比(SNR)、噪声、CT值等临床指标情况;比较两组的颈部动脉血管1分节段、2分节段、3分节段、4分节段的图像质量情况。结果观察组的对比噪声比(CNR)、信噪比(SNR)、噪声、CT值等临床指标情况分别为(40.2±6.3)、(40.6±7.9)、(9.1±2.3)、(388.6±40.3)HU,对照组分别为(58.9±10.8)、(69.7±15.7)、(7.4±0.5)、(490.8±60.2)HU,差异有统计学意义(t=10.03,11.11,4.85,9.46,P<0.05);而观察组与对照组的颈部动脉血管1分节段、2分节段、3分节段、4分节段的图像质量比较,差异无统计学意义(P>0.05)。结论颈部CTA检查中应用64排CT"双低"扫描模式可显著降低患者所受的碘总量和辐射剂量,同时可获得较佳的图像质量。
