摘要
目的探究上腹部能谱CT智能匹配技术在提高图像对比噪声比(CNR)、降低对比剂使用量中的应用。方法选取行上腹部CT平扫以及双期增强扫描患者126例,分为实验组和对照组,各63例。实验组应用上腹部能谱CT智能匹配技术,对比剂含碘量为300 mg/kg,并采用滤波反投影法(FBP)获得A组图像;然后采用自适应统计迭代重组技术(AISR)获得B组图像。对照组采用常规CT平扫模式(120 k Vp),对比剂含碘量为450 mg/kg,采用FBP获得C组图像。比较三组图像在40 ke V、50 ke V、60 ke V动脉期和门静脉期的图像噪声以及肝、胰、门静脉、腹主动脉的CNR,并对三组图像进行评分。结果三组在40 ke V、50 ke V、60 ke V动脉期和门静脉期的图像噪声比较,差异均有统计学意义(F分别=187.72、246.35、51.98、127.50、23.15、48.96,P均<0.05)。两两比较结果显示,在40ke V动脉期和门静脉期,C组图像噪声低于B组和A组(q分别=8.32、9.37,P均<0.05);在50ke V动脉期和门静脉期时,B组和C组图像噪声均明显低于A组(q分别=5.73、6.84,P均<0.05);在60 ke V动脉期和门静脉期时,B组图像噪声均明显低于A组和C组(q分别=3.83、3.63,P均<0.05)。三组在40 ke V、50 ke V、60 ke V动脉期和门静脉期的肝、胰、腹主动脉(门静脉)CNR值比较,差异具有统计学意义(F分别=8.52、33.94、60.59、72.70、69.38、44.06;8.27、33.65、42.68、79.84、45.73、80.93;10.64、33.14、31.12、59.96、62.93、39.12,P均<0.05)。在40 ke V、50 ke V、60 ke V时,B组动脉期肝、胰、腹主动脉CNR值和门静脉期肝、胰、门静脉CNR值均明显高于A组和C组,差异均有统计学意义(q分别=16.73、8.72、12.71、10.82、14.65、15.71、11.67、12.51、8.77、10.52、9.79、13.80;8.79、12.83、10.62、14.62、10.81、8.51、10.66、12.79、13.72、9.81、10.53、12.49;4.49、5.64、6.82、10.53、7.52、5.93、11.61、9.27、6.31、10.65、9.51、10.11,P均<0.05)。三组在40 ke V、50 ke V、60 ke V动脉期�
Objective To explore the application of upper abdomen energy spectrum CT intelligent matching technology in improving image CNR and reducing contrast agent. Methods A total of 126 cases undergoing upper abdominal CT scan and double phase enhanced scan were selected and divided into experimental group and control group with 63 cases in each. The upper abdomen energy spectrum CT intelligent matching technology was applied in the experimental group. The contrast agent iodine content was 300 mg/kg,and the images that obtained by filtered back projection （FBP）were defined group A. The adaptive statistical iterative reconstruction technique was used to obtain images as group B. The conventional CT scan mode （120 kVp）was applied in the control group. The contrast agent iodine was 450 mg/kg,and the images that obtained by FBP were defined group C. The images＇ noises of 40 keV,50 keVand 60 keV in the arterial phase and portal venous phase and CNR of the liver and pancreas,portal vein and abdominal aorta were compared as well as imaging scores among three groups. Results The images＇ noises of 40 keV,50 keVand 60 keV in the arterial phase and portal venous phase among were significantly different（F=187.72,246.35,51.98,127.50,23.15,48.96,P〈O.05）. Further analysis showed that the images＇ noises of group C at arterial phase and portal venous phase were significantly lower than group B and group A in 40 keV （q =8.32,9.37,P〈0.05）. The images＇ noises of group A at arterial phase and portal venous phase were significantly higher than group B and group C in 50 keV （q=5.73,6.84,P〈 0.05）. The images＇ noises of group B at arterial phase and portal venous phase were significantly lower than group A and group C in 60 keV（q=3.83,3.63,P〈O.05）. The CNR of 40 keV,50 keV,60 keV in arterial phase and portal venous phase among three groups were statistically different （F =8.52,33.94,60.59,72.70,69.38,44.06 ; 8.27,33.65,42.68,79.84,45.73,80.93;10.64,33.14,31.12,59.96,62.93,39.12,P〈0.05）. In 40 keV
出处
《全科医学临床与教育》
2017年第2期144-148,共5页
Clinical Education of General Practice
关键词
上腹部能谱CT智能匹配技术
滤波反投影法
对比噪声比
对比剂剂量
upper abdominal energy spectrum CT intelligent matching technology
filtered back projection method
contrast to noise ratio
dosage of contrast agent
