双能CT对膝关节韧带损伤的诊断价值

The diagnostic value of dual energy CT displaying knee joint torn ligament

目的探讨双能CT成像显示膝关节后交叉韧带损伤的价值。方法收集单侧膝关节后交叉韧带损伤的患者10例，同时行MRI检查和双能CT扫描，对数据行多平面重组（MPR）及螺旋CT容积漫游技术（VRT）图像后处理，分别测量其CT值、长度及起点、止点和中点的厚度。结果MPR和VRT图像均较清晰地显示了后交叉韧带，病变侧和正常侧的CT值分别为（60．10±3．21）、（72．98±7．35）HU（t=4．33，P=0．006）；后交叉韧带长度，病变侧为（4．42±0．56）cm，正常侧为（4．14±0．49）cm（t=-1．20，P：0．285）；后交叉韧带起点、中点、止点厚度，病变侧分别为（0．88±0．19）、（0．58±0．10）和（0．38±0．12）cm，正常侧分别为（0．43±0．07）、（0．39±0．03）和（0．43±0．12）cm（t=-6．89，P=0．001；t=-4．38，P=0．007；t=0．85，P=0．587）。结论双能CT是一种能够多方位、立体、直观地显示膝关节韧带的新方法，对诊断和手术前评估具有一定的参考价值。

Objective To explore the value of dual energy CT displaying knee joint torn posterior cruciate ligament （PCL）. Methods Ten cases with single knee joint torn PCL were scanned by 1.5 TMR and dual energy CT. By the use of postprocessing technique of multiplanar reformation （MPR） and volume rendering technique （VRT）, the CT value,length,thickness of PCL were assessed by paired t test respectively. Results MPR and VRT clearly displayed the PCL. The CT value of the patient sides and normal sides were （60.10 ± 3.21 ）, （72.98 ± 7.35 ） HU （t = 4.33, P = 0.006 ）, the length were （4.42 ＋ 0.56 ）, （4.14 ± 0.49 ） cm （t = -1.20, P = 0.285 ）, the thickness of the attachment site and middle site were （0.88 ± 0.19）, （0.58 ± 0.10）, （0.38 ± 0.12） cm and （0.43 ± 0.07）, （0.39 ± 0.03）, （0.43 ± 0.12） cm （t = -6.89, P =0.001;t =-4.38,P =0.007;t =0.85,P =0.587） respectively. Conclusion Dual energy CT can demonstrate clearly the ligament with three-dimension display, and may provide important information for diagnosis and per-surgical evaluation.