| 李杰,袁源,王春杰,袁慧书.能谱CT去金属伪影(MAR)技术用于减低单髋关节置换物伪影[J].中国医学影像技术,2021,37(1):131~135 |
| 能谱CT去金属伪影(MAR)技术用于减低单髋关节置换物伪影 |
| Energy spectrum CT metal artifacts reduction (MAR) for reducing artifacts of unilateral hip arthroplasty |
| 投稿时间：2020-01-11 修订日期：2020-05-11 |
| DOI：10.13929/j.issn.1003-3289.2021.01.032 |
| 中文关键词: 关节成形术,置换,髋 体层摄影术,X线计算机 金属伪影 能谱成像 |
| 英文关键词:arthroplasty, replacement, hip tomography, X-ray computed metal artifacts spectral imaging |
| 基金项目:北京大学青年培育基金（BMU2020PYB027）。 |
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| 中文摘要: |
| 目的 评价能谱CT去金属伪影（MAR）技术减低单侧髋关节置换物伪影的效果。方法 对33例单侧髋关节置换术后患者行能谱CT检查，获取扫描数据后重建70~140 keV （间隔10 keV） MAR和非MAR图像，计算图像伪影指数（AI）和信噪比（SNR），并进行主观评分。选取AI较低和主观评分较高的非MAR单能量图像进行分析，比较不同能级MAR图像和伪影较少非MAR图像的AI和SNR差异。结果 非MAR图像110 keV条件下伪影较少。70~140 keV水平MAR图像关节前方、外侧肌肉组织和膀胱处AI值均低于110 keV非MAR图像（P均<0.05），110~140 keV水平MAR图像后方肌肉组织和100~140 keV水平MAR图像髋臼处的AI值均低于110 keV非MAR图像（P均<0.05）。110~140 keV水平MAR图像外侧方肌肉组织SNR高于110 keV非MAR图像（P均<0.05）。高keV水平MAR图像不同区域AI值较70 keV及80 keV减低（P均<0.05）。高于80 keV水平时，MAR图像主观评分均≥ 3分。结论 MAR技术可有效减少单髋关节置换物伪影，提高解剖结构清晰度。 |
| 英文摘要: |
| Objective To evaluate the effect of energy spectrum CT metal artifacts reduction (MAR) technology in reducing artifacts of unilateral hip arthroplasty. Methods A total of 33 patients underwent energy spectrum CT after unilateral hip replacement. MAR and non-MAR images were reconstructed at 70-140 keV (interval of 10 keV). Then artifacts index (AI) and signal-to-noise ratio (SNR) of the images were calculated, and subjective scoring was performed. Non-MAR single-energy images with lower AI and higher subjective scores were selected for analysis, and the relative AI and SNR were compared. Results There were less artifacts in non-MAR image at 110 keV. AI values in the anterior, lateral muscle tissues of the joint and bladder at 70-140 keV MAR images were lower than those at 110 keV non-MAR images (all P<0.05). AI values in posterior muscle at 110-140 keV MAR images and in acetabulum at 100-140 keV MAR images were lower than those at 110 keV non-MAR images (all P<0.05). SNR in lateral muscle at 110-140 keV MAR images were higher than that in 110 keV non-MAR (all P<0.05). AI values in different regions at higher KeV level MAR images were lower than those at 70 keV and 80 keV MAR images (all P<0.05). At higher than 80 keV, the subjective scores of MAR images were all ≥ 3. Conclusion MAR technology could effectively reduce artifacts of unilateral hip replacement and improve the clarity of anatomical structures. |
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