全模型迭代重建技术在冠状动脉钙化模体扫描中的应用价值研究

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Abstract Objective: To determine whether or not IMR with lower tube current could replace FBP with routine tube current, and to find the lowest possible tube current for coronary calcium scanning while maintaining accurate Agatston score, volumn score and mass score using a cadiac phantom. Meterials and Methods: An anthropomorphic thoracic and heart phantom containing 9 calcium-insert columns was used to measure the sum of the Agatston score, volumn score, mass score of the 9 columns, Agatston score of different diameter columns and different density columns. And then these measurements among different current and algorithm groups were compared. Using the measurements of 120 kV, 80 mAs with traditional FBP as gold standard(Group A), the measurements with tube voltage 120 kV, and lower tube current of 50 mAs, 40 mAs, 30 mAs and 20 mAs with IMR algorithm were kept as group B, C, D and E, respectively. Then each measurement was compared with gold standard, with P<0.05 as statistical significance. Result: There was no significant difference between each lower current group and group A. For noise, Group E was significantly higher than Group A(16.5±2.6 vs 8.77±1.55, P=0.005). There was no significant difference between group A and group B~D. The radiation dose of group D was 62.41% lower than that of group A((2.53±0.06) mGy vs (6.73±0.23) mGy). Conclusion: Technology IMR with lower tube current could replace FBP with 80 mAs. The optimal low dose group is group D(IMR with 120 kV, 30 mAs). The scanning dose of group D is 62.41% lower than group A.

Key words： Coronary diseases Tomography, X-ray computed

Received: 07 June 2016

PACS:	Ｒ543.3
	Ｒ814.42

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	Articles by authors
	TAN Jing
	HOU Yang
	GUO Wen-li
	GAO Si-zhe

Cite this article:

TAN Jing,HOU Yang,GUO Wen-li, et al. A study of iterative model reconstruction technology in a cardiac coronary calcium anthropomorphic phantom[J]. JOURNAL OF CHINA MEDICAL IMAGING, 2016, 27(12): 867-870.

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http://www.jccmi.com.cn/EN/ OR http://www.jccmi.com.cn/EN/Y2016/V27/I12/867

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