| 自适应统计迭代重建技术在髋关节64排CT低管电流检查中的应用 |
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| 引用本文： | 苏大军, 查云飞. 自适应统计迭代重建技术在髋关节64排CT低管电流检查中的应用[J]. CT理论与应用研究, 2014, 23(6): 1011-1017. |
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| 作者姓名： | 苏大军 查云飞 |
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| 作者单位： | 1.武汉大学人民医院放射科, 武汉 430060 |
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| 摘 要： | 目的:探讨自适应统计迭代重建 (ASIR) 技术在髋关节64排CT低管电流检查中的应用。方法:106例髋关节64排螺旋CT扫描患者, 随机选取53例患者采用常规管电流220 mAs扫描, 并采用滤过反投影 (FBP) 方式重建。另外53例患者采用低管电流50 mAs扫描, 并采用30%ASIR技术。对两组髋关节图像的辐射剂量和图像质量进行评价, 并比较不同重建图像在同一层面的图像噪声值和信噪比。结果:常规管电流组与低管电流组的CT剂量指数 (CTDIvol) 分别为 (15.55±0.20) mGy、 (3.56±0.15) mGy, 低管电流组平均CTDIvol较常规管电流组降低77.1%;常规管电流组与低管电流组的剂量长度乘积 (DLP) 分别为 (297.82±2.9) mGy·cm、 (67.59±3.3) mGy·cm, 低管电流组平均DLP较常规管电流组降低77.3%, 低管电流组与常规管电流组相比, 辐射剂量大大降低 (P＜0.05) 。常规管电流组图像质量评分为优、良、差的患者分别为49、4和0例;低管电流组图像质量评分为优、良、差的患者分别为42、11及0例。两组图像的差异无统计学意义 (P＞0.05) 。图像噪声值分别为31.44、44.29, 差异有统计学意义 (P＜0.05) 。图像信噪比分别为11.03、10.06, 差异有统计学意义 (P＜0.05) 。结论:ASIR技术应用于64排螺旋CT髋关节低管电流扫描, 大幅降低辐射剂量的同时, 图像质量也能满足临床诊断的需要。
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| 关 键 词： | 迭代重建算法 髋关节 辐射剂量 螺旋CT |
| 收稿时间： | 2014-09-11 |
Application of ASIR Techniques in Hip with Low Tube Current 64 Row CT |
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| SU Da-jun, ZHA Yun-fei. Application of ASIR Techniques in Hip with Low Tube Current 64 Row CT[J]. CT Theory and Applications, 2014, 23(6): 1011-1017. |
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| Authors: | SU Da-jun ZHA Yun-fei |
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| Affiliation: | 1.Department of Radiology, Renmin Hospital of Wuhan University, Wuhan 430060, China |
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| Abstract: | Objective： To explore the feasibility of adaptive statistical iterative reconstruction（ASIR） technique in 64-slice CT of hip with low tube current application. Methods： Of 106 patients with 64 row helical CT scan of hip,53 patients were treated with conventional tube current of 220 m As scanning, and were reconstructed with filtered back projection（FBP）, 53 patients were treated with low tube current of 50 m As scanning and were reconstructed with 30% of adaptive statistical iterative reconstruction（ASIR）.The radiation dose, image noise（S D value） and signal-to-noise ratio of different reconstruction images of two groups were compared respectively at the same level. Results： The CTDIvol value was（15.55 ± 0.20） m Gy in the conventional group and（3.56 ± 0.15） m Gy in the low tube current group, the CTDIvol in the low tube current group was 77.1% of that in the conventional group, the DLP was（297.82 ± 2.9） m Gy·cm in the conventional group and（67.59 ± 3.3） m Gy·cm in the low tube current group, the DLP in the low tube current group was 77.3% of that in the conventional group. Compared with the conventional group, the radiation dose of low tube current group was reduced greatly（P 〈 0.05）. The image quality with excellent、good、bad was 49, 4 and 0 cases, respectively, in the conventional group. 42, 11 and 0 cases in the low tube current group,difference of image quality between two groups were no statistically significant（P 〉 0.05）. The difference of image noise value and SNR between two groups were statistically significant, respectively（P 〈 0.05）. Conclusion： It is feasible to apply 30% of ASIR technology in 64 row helical CT of hip with low-current of 50 m A, resulting with the reduction of radiation dose, meanwhile, the image quality can meet the need of clinical diagnosing. |
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| Keywords: | iterative reconstruction algorithms hip joint radiation dose spiral CT |
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