| 宁培钢,史大鹏,程晓军,吕玉民,朱绍成.高级迭代重建算法降低盆腔CT剂量潜能的模体研究[J].中华放射医学与防护杂志,2013,33(5):547-550 |
| 高级迭代重建算法降低盆腔CT剂量潜能的模体研究 |
| A phantom study of dose reduction potential in pelvic CT with advanced iterative reconstruction algorithms |
| 投稿时间：2013-01-11 |
| DOI：10.3760/cma.j.issn.0254-5098.2013.05.026 |
| 中文关键词: 体层摄影术 辐射剂量 重建算法 迭代 |
| 英文关键词:Tomography Radiation dose Reconstruction algorithm Iterative |
| 基金项目:"河南省中青年科技创新人才工程"专项基金(201052) |
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| 中文摘要: |
| 目的 探讨应用自适应统计迭代重建(ASiR)和基于模型的迭代重建(MBIR)降低盆腔CT扫描剂量的可行性。方法 应用宝石能谱CT以不同的管电流对标准男性模体扫描,记录不同毫安值扫描条件下的容积CT剂量指数(CTDIvol)和剂量长度乘积(DLP),测量滤过反投影重建(FBP)、50% ASiR及MBIR 3种重建模式下图像的平均CT值、噪声及对比噪声比。由3位高年资医师对图像给予主观评价。结果 50% ASiR及MBIR重建算法比FBP重建算法噪声明显减少,对比噪声比明显提高。能够符合诊断要求的最小mA值分别为250 mA (FBP)、180 mA(50% ASiR) 和100 mA (MBIR)。在同等图像质量情况下,50% ASiR及 MBIR重建模式分别可减少剂量28.0% 及59.9%。结论 高级迭代重建算法能够减少图像噪声,提高图像对比噪声比,降低盆腔CT剂量。 |
| 英文摘要: |
| Objective To assess the dose reduction potential of adaptive statistical iterative reconstruction (ASiR) and model-based iterative reconstruction (MBIR) in pelvic CT with a standard male phantom. Methods A Fluke Biomedical RANDO standard male phantom was scanned with discovery CT750 HD using different tube currents. CT images were reconstructed with FBP, 50% ASiR and MBIR. The CT value, the image noise and the contrast-to-noise ratio (CNR) for the sacral vertebra relative to muscle were measured. The volume CT dose indexes (CTDIvol) and dose-length product (DLP) were recorded. Results Compared with FBP, using 50% ASiR and MBIR had significant reduced image noise and greater CNR. The effective minimal tube currents for displaying sacral vertebra were 250 mA (FBP), 180 mA (50% ASiR), and 100 mA (MBIR). With the similar image quality using FBP, the dose was reduced by 28.0% and 59.9% using 50% ASiR and MBIR, respectively. Conclusions Using advanced iterative algorithms can reduce image noise, improve CNR, and reduce the radiation dose in pelvic CT examination. |
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