多排螺旋CT容积重建技术在Q角测量中的应用价值分析

目的 依据Q角定义,结合现代影像学多排螺旋CT容积重建技术(VR)和影像处理工作站的技术特点,完整再现股四头肌与髌骨解剖关系,并且在重建的三维影像上完成Q角的测量,获得了精确的测量数据,指导临床治疗.方法 2006年-2008年,拟行手术治疗的髌骨不稳定的病例62例(男21例,女41例),年龄14～45岁,平均年龄22.1岁.术前行64排CT螺旋扫描,自编VR重建协议,在容积重建影像上进行Q角测量.所得数据与临床体表划线测量Q角数据进行配对t检验统计分析.结果 采用多排CT容积重建影像测量的Q角,62例健侧x±s为12.5°±4.8°.采用临床体表划线62例健侧x±s为14.5°±5.5°.两种方法对照有统计学意义(P<0.05).结论 采用多排螺旋CT容积重建影像测量Q角,与临床体表划线测量法比较,数据准确可靠.Q角测量数据的一致性好.为临床制定手术方案提供了准确的影像学数据,并有利于随访观察.

Applicating value analysis of VR techniques of MSCT in Q-angles measurement

Objective According to the definition of Q-angles, we combined the volume rendering (VR) techniques of MSCT with image workstation to reconstruct the anatomic relationship between quadriceps femoris and patella integrallty. The measurement of Q-angles was done on the reconstructed 3D images, and accurate data was obtained to guide clinical treatment. Methods From 2006 to 2008, 62 patients with patellar instability including 21 males and 41 females were examined with multi-slice spiral CT scan before operation, age ranged from 14 to 45 years, mean age was 22.1 years. We composed the VR protocol ourselves. We measured the Q-angles on the reconstructed images. The acquired data was compared with the data obtained by body surface measurement with paired T-test. Results Among the Q-angles acquired with Volume Rendering techniques of MSCT, the average value of the Q-angles of 62 uninjured sides ( Ax-G ±s) was 12.5°±4.8°. Among the Q-angles obtained by body surface measurement, the average value of the Q-angles of 62 uninjured sides ( Ax-G ±s) was 14.5°±5.5°. The difference between these two methods showed statistical significance (P<0.05). Conclusion Comparing with body surface measurement, the data of Q-angles obtained by the method of VR techniques of MSCT was more accurate and credible. The data has satisfactory consistency, which offer exact image data for surgical operation plans and are in favor of following up.