Application of iterative reconstruction technique in low dose chest examination
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摘要:
目的探讨迭代重建技术在低辐射剂量胸部CT检查中的应用价值。 方法行胸部CT平扫的门诊或住院病人66例，随机分为常规剂量组和低剂量组，常规剂量组（A组）运用滤波反投影（FBP）重建生成图像，低剂量组采用低剂量扫描后分别采用FBP（B组）和迭代重建技术（C组）生成图像。对三组噪声、信噪比（SNR）、对比噪声比（CNR）和重建图像质量进行对比。 结果A、C组噪声值明显低于B组，而CNR、SNR则高于B组（P < 0.05）。A、C两组图像质量均能完全满足临床诊断需求，观察者间具有较好一致性，而B组CT图片在图像总体质量方面评分明显较低，与A、C两组差异均具有统计学意义（P < 0.05）。 结论迭代重建技术运用于低辐射剂量胸部CT检查中安全可靠，能够获得满足诊断要求的图像。 Abstract:Objective To investigate the application value of iterative reconstruction technique in low radiation dose chest CT examination. Methods A total of 66 cases of outpatients or inpatients with the chest CT scaned, were divided into conventional dose group and low dose group randomly, The conventional dose group (group A) was reconstructed using filtered back projection (FBP), when low dose group were treated with low dose scanning respectively using FBP (group B) and iterative reconstruction technique (Group C) to generate the image. Compared with the noise, signal to noise ratio (SNR), contrast to noise ratio (CNR), and the quality of reconstructed images of the three groups. Results The noise in A and C group was significantly lower than that in B group, while CNR and SNR were higher than those in B group (P < 0.05). The image quality of A and C two groups could fully meet the needs of clinical diagnosis, and the observation were in good agreement, while the B group CT images in the overall quality of the image score was significantly lower, and the difference between A and C two groups were statistically significant (P < 0.05). Conclusion Iterative reconstruction technique used in low radiation dose chest CT examination was safe and reliable, could meet the diagnostic requirements to obtain an image. -
Key words:
- iterative reconstruction technique /
- CT /
- filtered back projection
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表 1 3组噪声值、SNR和CNR比较（χ±s,n=20）
组别 噪声值（dB） CNR SNR A组 13.53±3.07 16.46±1.55 6.88±0.75 B组 18.88±3.89 6.43±1.31 5.03±0.76 C组 12.42±2.23 15.56±1.42 6.93±0.97 
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