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| Clinical Study on Optimizing Lamina CT Imaging Quality of Abdominal Vein by Model-based Iterative Reconstruction |
| The People’s Hospital of Mudan District in Heze City，Heze 274000，China |
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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.
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