Radiation dose optimization in computed tomography with current modulation and Iterative Reconstruction

S. Gharbi, S. Labidi
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引用次数: 2

Abstract

The study was aimed at evaluating the value of current modulation (mAs) and iterative reconstructions algorithms during Computed Tomography examinations in terms of dose reduction and image quality. The focus was mainly on non-contrast head and chest-abdomen-pelvis examinations. A total of 40 adult patients with weighting between 65 and 80 kg underwent CT examinations (20 head and 20 chest-abdomen-pelvis). All examinations were performed on a 128-slice scanner (Somatom Definition AS from Siemens, Forchheim, Germany) using CARE Dose 4D technology. The radiation dose values were compared with reference levels values recommended for head and chest-abdomen-pelvis regions. Image quality was evaluated both objectively and subjectively using Students' test. The results on the present study showed that through the combination of CARE Dose 4D and SAFIRE; the radiation dose could be reduced by 20.10% and 59 % for the examination of head and chest-abdomen-pelvis respectively. There was a substantial difference in the image quality when using FBP or SAFIRE (p < 0.05). The noise level dropped significantly during SAFIRE when compared to FBP by 14.25% for head and by 27.60% and for chest-abdomen-pelvis scans. We conclude that automatic exposure control mechanism based on tube current modulation CARE Dose 4D when combined with iterative reconstruction SAFIRE delivers good image quality with low dose for non-enhanced head and chest-abdomen-pelvis scans.
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该研究旨在评估电流调制(mAs)和迭代重建算法在计算机断层扫描检查中的剂量减少和图像质量方面的价值。重点主要是无对比的头部和胸腹骨盆检查。共有40例体重在65 - 80 kg之间的成年患者接受了CT检查(20例头部和20例胸腹骨盆)。所有检查均在128层扫描仪(德国福希海姆西门子公司Somatom Definition AS)上进行,采用CARE Dose 4D技术。将辐射剂量值与推荐的头、胸、腹、骨盆区域的参考值进行比较。采用学生测试对图像质量进行客观和主观评价。本研究结果表明,通过CARE剂量4D与SAFIRE联合使用;头部和胸腹骨盆检查的放射剂量分别降低20.10%和59%。使用FBP和SAFIRE时,图像质量有显著差异(p < 0.05)。与FBP相比,SAFIRE期间噪声水平显著下降,头部和胸腹骨盆扫描分别下降14.25%和27.60%。我们得出结论,基于管电流调制CARE Dose 4D的自动曝光控制机制与迭代重建SAFIRE相结合,可在非增强头部和胸腹骨盆扫描中以低剂量获得良好的图像质量。
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