| 超低剂量下不同迭代重建技术在肺动脉成像中的优化 |
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| 引用本文： | 王素雅,万娅敏,刘杰,高剑波,魏一娟.超低剂量下不同迭代重建技术在肺动脉成像中的优化[J].中国医学影像技术,2016,32(5):790-794. |
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| 作者姓名： | 王素雅 万娅敏 刘杰 高剑波 魏一娟 |
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| 作者单位： | 郑州大学第一附属医院放射科, 河南 郑州 450052,郑州大学第一附属医院放射科, 河南 郑州 450052,郑州大学第一附属医院放射科, 河南 郑州 450052,郑州大学第一附属医院放射科, 河南 郑州 450052,郑州大学第一附属医院放射科, 河南 郑州 450052 |
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| 摘 要： | 目的 探讨不同迭代重建技术在超低剂量肺动脉成像中的应用价值。方法 对30例临床疑似肺动脉栓塞患者行CT肺动脉成像,扫描采用80 kV管电压并开启自动管电流调制技术,分别采用滤波反投影法(FBP)、iDOSE4、迭代模型重建(IMR)重建图像。采用5分制评价肺动脉主干及其分支的图像质量,测量计算图像噪声值、SNR、CNR,记录CT容积剂量指数(CTDIvol)、剂量长度乘积(DLP)、计算有效剂量(ED)。比较不同重建技术图像噪声、SNR、CNR及主观图像质量。结果 30例患者的平均体质量指数(BMI)为(25.12±2.48)kg/m2;平均CTDIvol为(0.78±0.28)mGy;平均DLP为(30.46±11.34)mGy·cm,平均ED为(0.43±0.16)mSv。IMR、iDOSE4、FBP图像噪声依次增高(P<0.05),SNR、CNR依次降低(P<0.05),CT值差异无统计学意义(P>0.05)。IMR、iDOSE4图像的主观评分显著高于FBP(P<0.05);IMR、iDOSE4图像可诊断率高于FBP(P<0.05),IMR图像优良率高于iDOSE4(P<0.05)。结论 采用80 kV联合IMR可保证肺动脉成像较高的图像质量,同时大大降低患者辐射剂量。
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| 关 键 词： | 肺动脉栓塞 体层摄影术 X线计算机 血管造影术 辐射剂量 图像处理 计算机辅助 |
| 收稿时间： | 2015/8/23 0:00:00 |
| 修稿时间： | 2015/11/4 0:00:00 |
Optimization on different iterative reconstruction algorithms in super-low-dose pulmonary CT angiography |
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| WANG Suy,WAN Yamin,LIU Jie,GAO Jianbo and WEI Yijuan.Optimization on different iterative reconstruction algorithms in super-low-dose pulmonary CT angiography[J].Chinese Journal of Medical Imaging Technology,2016,32(5):790-794. |
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| Authors: | WANG Suy WAN Yamin LIU Jie GAO Jianbo and WEI Yijuan |
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| Institution: | Department of Radiology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China,Department of Radiology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China,Department of Radiology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China,Department of Radiology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China and Department of Radiology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China |
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| Abstract: | Objective To evaluate the image quality produced by different iterative reconstruction (IR) techniques in super-low-dose pulmonary CT angiography (CTPA). Methods Totally 30 patients with clinical suspicion of pulmonary embolism underwent CTPA. CTPA was performed using 80 kV tube voltage and automatic modulation. The raw data were reconstructed by filtered back projection (FBP), hybrid iterative reconstruction (HID, iDOSE4)and iterative model reconstruction (IMR) technique. The image quality parameters including image noise, SNR, CNR and subjective image score (from one to five) were measured and compared among 3 reconstruction techniques. The values of volume CT dose index (CTDIvol), dose length product (DLP), effective radiation dose (ED) were recorded and calculated. Results The mean value of BMI, CTDIvol, DLP, ED were respectively (25.12±2.48)kg/m2, (0.78±0.28)mGy, (30.46±11.34)mGy·cm, (0.43±0.16)mSv. The image noise increased from IMR to FBP, and the SNR, CNR reduced (all P<0.05). The mean CT value of pulmonary arteries had no significant difference among 3 reconstruction techniques (P>0.05). The IMR images received significantly higher score than iDOSE4and FBP (P<0.05). The diagnosable rate of IMR, iDOSE4were significantly higher than that ofFBP, the good quality rate of IMR was significantly higher than that of iDOSE4 (P<0.05). Conclusion The IMR can produce improved image quality in 80 kV tube voltage protocol, and it can substantially reduce radiation dose. |
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| Keywords: | Pulmonary embolism Tomography X-ray computed Angiography Radiation dosage Image processing computer-assisted |
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