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中华肩肘外科电子杂志 ›› 2022, Vol. 10 ›› Issue (02) : 135 -140. doi: 10.3877/cma.j.issn.2095-5790.2022.02.008

论著

双源CT能谱纯化单能量技术在评估喙锁韧带中的价值
梅碧1, 罗倩1, 赵佳1, 张蕾1, 吴晓明2,()   
  1. 1. 200080 上海交通大学附属第一人民医院放射科
    2. 200080 上海交通大学附属第一人民医院创伤中心
  • 收稿日期:2021-11-30 出版日期:2022-05-05
  • 通信作者: 吴晓明
  • 基金资助:
    上海体育科技项目(19Z007)

Preliminary study on the value of dual-source CT energy spectrum purification single energy technique in evaluating coracoclavicular ligament

Bi Mei1, Qian Luo1, Jia Zhao1, Lei Zhang1, Xiaoming Wu2,()   

  1. 1. Department of Radiology, Shanghai General Hospital, Shanghai 200080, China
    2. Department of Orthopaedics and Traumatology, Shanghai General Hospital, Shanghai 200080, China
  • Received:2021-11-30 Published:2022-05-05
  • Corresponding author: Xiaoming Wu
引用本文:

梅碧, 罗倩, 赵佳, 张蕾, 吴晓明. 双源CT能谱纯化单能量技术在评估喙锁韧带中的价值[J]. 中华肩肘外科电子杂志, 2022, 10(02): 135-140.

Bi Mei, Qian Luo, Jia Zhao, Lei Zhang, Xiaoming Wu. Preliminary study on the value of dual-source CT energy spectrum purification single energy technique in evaluating coracoclavicular ligament[J]. Chinese Journal of Shoulder and Elbow(Electronic Edition), 2022, 10(02): 135-140.

目的

探讨双源CT能谱纯化单能量技术对喙锁韧带结构显示的可行性及对韧带显示最佳的能量级。

方法

回顾性分析40例双能量CT扫描的单侧肩关节患者影像学资料,采用双源CT"单能+"软件分别获得喙锁韧带40 keV、60 keV、70 keV、80 keV、100 keV 5组单能量图像,并与线性融合(M=0.5)图像对比,分析比较不同能级单能量图像间的CT值及信噪比(signal-to-noise ratio,SNR)、最佳单能量图像与线性融合(M=0.5)图像间的SNR以及总体主观图像质量评分。

结果

(1)斜方韧带及锥状韧带在40 keV总体主观图像质量评分均高于其他5组(P均<0.05)。2位观察者间主观图像质量评分一致性较好[Kappa(斜方):0.822~0.978;Kappa(锥状):0.905~0.971]。(2)5组单能量图像间的斜方韧带CT值及锥状韧带CT值差异均有统计学意义(P均<0.001),且40 keV>60 keV>70 keV>80 keV>100 keV 。(3)40 keV斜方韧带及锥状韧带图像的SNR均高于其他4组,差异有统计学意义(P均<0.05);70 keV与80 keV斜方韧带及锥状韧带间SNR值比较差异无统计学意义(P>0.05),余各组间的SNR差异均有统计学意义(P<0.05),且40 keV>60 keV>70 keV>100 keV;与线性融合(M=0.5)图像相比,40 keV新单能量图像斜方韧带及锥状韧带SNR值均较高(P<0.05)。

结论

双能量CT的单能纯化技术可清晰显示喙锁韧带形态及走行,且在40 keV时对斜方韧带及锥状韧带的显示最佳。

Background

The coracoclavicular ligament is the main structure that maintains the vertical stability of the distal clavicle. At present, the gold standard for the imaging diagnosis of coracoclavicular ligament injury is MRI, but when acromioclavicular joint dislocation or displaced distal clavicle fracture, it is often accompanied by displacement of the coracoclavicular ligament attachment point, which requires individualized scanning direction and range, and at the same time, curling up after ligament injury makes imaging difficult, which limit the application of MRI in these injuries. Therefore, it is necessary to seek new imaging techniques that clearly show the coracoclavicular ligament. Objective To explore the feasibility of dual-source CT energy spectrum purification single-energy technique to display the structure of coracoclavicular ligament and the best single energy level for the ligament display.

Methods

The imaging data of 40 patients with unilateral shoulder joints on dual-energy CT scan were analyzed retrospectively, Virtual monoenergetic images at five different kiloelectron volt (keV) levels (40 keV/60 keV/70 keV/ 80 keV/100 keV) were reconstructed by using advanced monoenergetic software. Quantitative parameters [signal-to-noise ratio (SNR) and CT value] and overall image quality score were compared between different keV levels of monoenergetic images and linear fusion (M=0.5) images.

Results

(1) Inter-observer agreement was good to excellent for subjective image quality [Kappa (TL) : 0.822-0.978; Kappa (CL) : 0.905-0.971]. The overall image quality score of the 40 keV group was higher than that of the other five groups (P<0.05) . (2) The CT values of the trapezoidal ligament and the conical ligament were gradually reduced as the energy level decreased (P<0 .001 ) . (3) There was no significant difference in SNR between 70 keV and 80 keV of the trapezoidal ligament and the conical ligament (P>0.05) , and with the keV levels increasing, the CNR was gradually reduced (P<0.001) ; The SNR of the trapezoidal ligament and the conical ligament were higher in 40 keV images than those in the linear fusion (M=0.5) image (P<0.05) .

Conclusion

The morphology and course of the coracoclavicular ligament could be shown by the energy spectrum CT and the best display of the trapezoid ligament and the cone ligament at 40 keV.

图1 斜方韧带及锥状韧带锁骨下表面足印区
图2 双能量CT上喙锁韧带的走行方向(V型)
图3 双能量CT扫描90 KV/Sn150 KV 图A-E:斜方韧带及锥状韧带40 keV、60 keV、70 keV、80 keV、100 keV新单能量图像;图F:斜方韧带及锥状韧带线性融合(M=0.5)图像;图G:斜方韧带及锥状韧带DE染色图像;图H:斜方韧带40~180 keV水平能谱曲线图;图I:锥状韧带40~180 keV水平能谱曲线图;图J:斜方韧带及锥状韧带5组单能量图像上能谱曲线
表1 新单能量图像和线性融合(M=0.5)图像主观图像质量评分
表2 新单能量图像的CT值比较
表3 新单能量图像间的SNR比较
表4 40 keV单能量图像与M=0.5图像间的SNR比较
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