基于模型的迭代重建技术优化腹部薄层CT静脉成像质量的临床研究(1)
【摘要】 目的：探讨基于模型的迭代重建技术(MBIR)优化腹部薄层CT静脉成像质量及降低辐射剂量的临床效果，旨在提高MBIR的成像质量及保障患者安全。方法：选取行腹部CT检查的患者30例，采用GE HD750型CT机行腹部平扫及增强扫描，再使用GE AW4.5工作站分别以FBP、ASiR、MBIR进行重建图像。比较三组图像的主观图像质量评分、噪声值(SD)及对比噪声比(CNR)。结果：FBP组、ASiR组及MBIR组重建图像均能够符合诊断要求，主观评分分别为(3.20±0.55)分、(3.72±0.49)分、(4.65±0.27)分，三组比较差异均有统计学意义(F=6.10，P<0.05)。FBP、ASiR、MBIR组的背部肌肉及肝、肾、脾实质SD值依次降低，门静脉、胰静脉、脾静脉、下腔静脉CNR值依次增加，三组比较差异均有统计学意义(P<0.05)。与FBP组比较，ASiR组、MBIR组噪声降低率分别为27.86%～32.17%、56.61%～64.05%，CNR增加率分别为26.57%～53.66%、140.85%～183.25%。结论：MBIR能进一步降低腹部薄层CT的图像噪声，使辐射剂量降低约60.0%而仍可获得较好的图像质量，显示静脉血管更为清晰细致，具有更好的对比增强效果，显著优于FBP、ASiR。
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【关键词】 CT； 辐射； 静脉成像； 迭代重建
Clinical Study on Optimizing Lamina CT Imaging Quality of Abdominal Vein by Model-based Iterative Reconstruction/FENG Xin-huan.//Medical Innovation of China，2015，12(26)：071-074
【Abstract】 Objective： To explore the effect of optimizing lamina CT imaging quality of abdominal vein and decreasing radiation dosage by model-based iterative reconstruction (MBIR)， to improve MBIR’s imaging quality and guarantee patients safety. Method：30 cases underwent abdominal CT examination were selected，they were given abdominal plain scan and enhanced scan by GE HD750 type CT，then they were respectively given image reconstruction by filtered back projection (FBP)， adaptive statistical iterative reconstruction(ASiR) and MBIR by GE AW4.5 workstation. Subjective score of image quality， noise value(SD) and contrast noise ratio (CNR) of three groups image were compared. Result：Three groups’ reconstruction image all could meet diagnosis requirements， subjective ratings of FBP， ASiR and MBIR group were respectively (3.20±0.55)scores，(3.72±0.49)scores and (4.65±0.27)scores，there were statistical differences among three groups(F=6.10，P<0.05).SD values of back muscle，liver，spleen and kidney essence in FBP，ASiR and MBIR group were decreased successively，CNR values of portal vein， pancreatic vein，splenic vein and inferior vena cava were increased successively，the differences were statistically significant(P<0.05).Compared with FBP group， SD reduction rate in ASiR group and MBIR group were respectively 27.86%-32.17% and 56.61%-64.05%，CNR increased rate were respectively 26.57%-53.66% and 140.85%-183.25%.Conclusion：MBIR can further reduce noise value of abdominal lamina CT，it reduces the radiation dose about 60% and still get good image quality， shows clear and detailed vein， also has better contrast enhancement effect， and it is significantly better than FBP and ASiR.
【Key words】 CT； Radiation； Imaging； Iterative reconstruction, 百拇医药(冯新环)
, http://www.100md.com
【关键词】 CT； 辐射； 静脉成像； 迭代重建
Clinical Study on Optimizing Lamina CT Imaging Quality of Abdominal Vein by Model-based Iterative Reconstruction/FENG Xin-huan.//Medical Innovation of China，2015，12(26)：071-074
【Abstract】 Objective： To explore the effect of optimizing lamina CT imaging quality of abdominal vein and decreasing radiation dosage by model-based iterative reconstruction (MBIR)， to improve MBIR’s imaging quality and guarantee patients safety. Method：30 cases underwent abdominal CT examination were selected，they were given abdominal plain scan and enhanced scan by GE HD750 type CT，then they were respectively given image reconstruction by filtered back projection (FBP)， adaptive statistical iterative reconstruction(ASiR) and MBIR by GE AW4.5 workstation. Subjective score of image quality， noise value(SD) and contrast noise ratio (CNR) of three groups image were compared. Result：Three groups’ reconstruction image all could meet diagnosis requirements， subjective ratings of FBP， ASiR and MBIR group were respectively (3.20±0.55)scores，(3.72±0.49)scores and (4.65±0.27)scores，there were statistical differences among three groups(F=6.10，P<0.05).SD values of back muscle，liver，spleen and kidney essence in FBP，ASiR and MBIR group were decreased successively，CNR values of portal vein， pancreatic vein，splenic vein and inferior vena cava were increased successively，the differences were statistically significant(P<0.05).Compared with FBP group， SD reduction rate in ASiR group and MBIR group were respectively 27.86%-32.17% and 56.61%-64.05%，CNR increased rate were respectively 26.57%-53.66% and 140.85%-183.25%.Conclusion：MBIR can further reduce noise value of abdominal lamina CT，it reduces the radiation dose about 60% and still get good image quality， shows clear and detailed vein， also has better contrast enhancement effect， and it is significantly better than FBP and ASiR.
【Key words】 CT； Radiation； Imaging； Iterative reconstruction, 百拇医药(冯新环)