| 钱伟亮,丰川,周丹静,许建铭,王宏,张继斌,吴晓霞,钱鑫.FBP、iDose4和IMR重建算法对低剂量双下肢CTA图像质量的影响[J].中国医学影像技术,2017,33(2):290~294 |
| FBP、iDose4和IMR重建算法对低剂量双下肢CTA图像质量的影响 |
| Impact of reconstruction algorithms on low dose lower extremity CTA image quality: Comparison of FBP,iDose4 and IMR |
| 投稿时间：2016-08-11 修订日期：2016-12-08 |
| DOI：10.13929/j.1003-3289.201608051 |
| 中文关键词: 体层摄影术,X线计算机 基于模型的迭代重建 血管造影术 下肢 辐射剂量 |
| 英文关键词:Tomography,X-ray computed Iterative model reconstruction Angiography Lower extremity Radiation dosage |
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| 中文摘要: |
| 目的 探讨滤波反投影（FBP）、混合迭代重建（iDose4）和基于模型的迭代重建（IMR）技术对低剂量双下肢CTA图像质量的影响。方法 对56例成年患者行双下肢CTA扫描，分别用FBP、iDose4和IMR方法重建，测量下肢各段血管（腹主动脉分叉处、髂总动脉分叉处、股动脉近端、股动脉中段和腘动脉近端）的CT值、图像噪声及对比噪声比（CNR），并采用4分法对3组图像质量分别进行主观评分。结果 FBP、iDose4和IMR重建图像的下肢各段血管平均CT值分别为（511.07±195.05）HU、（492.63±178.74）HU、（487.63±197.20）HU，三者间差异无统计学意义（F=1.175，P>0.05）。图像噪声分别为（76.24±20.85）HU、（39.16±11.75）HU、（13.09±2.55）HU，三者间差异有统计学意义（F=1 460.000，P<0.05）。CNR分别为6.35±3.14、12.97±5.10、33.83±15.85，三者间差异有统计学意义（F=646.122，P<0.05）。图像质量主观评分IMR（3.75±0.46）、FBP（1.39±0.51）、iDose4（2.61±0.81）差异有统计学意义（χ2=476.79，P<0.05），膝关节以上、下段动脉可诊断率IMR（98.66%）明显高于FBP（1.34%）、iDose4（56.70%），差异均有统计学意义（χ2=427.9，P<0.05）。结论 行低辐射剂量双下肢CTA扫描时，相比FBP和iDose4，IMR可以显著降低图像噪声，提高图像质量，且能满足诊断要求。 |
| 英文摘要: |
| Objective To investigate the effect of different reconstruction algorithms, including filtered back projection (FBP), hybrid iterative reconstruction (iDose4) and iterative model reconstruction (IMR) on image quality of low dose lower extremity CTA.Methods Fifty-six patients underwent lower extremity CTA, and the images were reconstructed with FBP, iDose4 and IMR algorithms respectively. CT attenuation, image noise and contrast noise ratio (CNR) of 5 positions including aortic bifurcation, iliac bifurcation, proximal femoral artery, middle femoral artery, proximal popliteal artery were calculated. Subjective image quality of lower extremity arteries were assessed on a 4-point scale.Results CT attenuation of FBP, iDose4, IMR in lower extremity arteries were (511.07±195.05)HU, (492.63±178.74)HU, (487.63±197.20)HU, and there was no statistically significant difference among them (F=1.175, P>0.05). The mean image noise of FBP, iDose4 and IMR images were (76.24±20.85)HU, (39.16±11.75)HU, (13.09±2.55)HU, and the CNR of FBP, iDose4 and IMR images were 6.35±3.14, 12.97±5.10, 33.83±15.85, respectively. Image noise and CNR were both found significantly differences among the 3 methods (F=1 460.000, 646.122, both P<0.05). The visual scores were significantly higher for IMR (3.75±0.46) than those for FBP and iDose4 images (1.39±0.51 for FBP, 2.61±0.81 for iDose4, χ2=476.79, P<0.05). There were significant differences in the diagnosis rates of arteries above-the-knee as well as arteries below-the-knee among the 3 methods (FBP 1.34%, iDose4 56.70%, IMR 98.66%, χ2=427.9, P<0.05).Conclusion IMR may reduce image noise and improve image quality of low radiation dose lower extremity CTA compared with FBP, iDose4 without compromising the diagnostic requirements. |
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