O型臂引导下经皮椎间孔镜治疗腰椎间盘突出症

目的:总结O型臂引导下经皮椎间孔镜治疗腰椎间盘突出症术后疗效。方法:回顾性分析77例采用侧入路椎间孔镜技术治疗腰椎间盘突出症患者的临床资料,采用视觉模拟评分法(visual analogue score,VAS)及Oswestry功能障碍指数(Oswestry disability index,ODI)评估术后疼痛、功能改善等。结果:患者术前VAS7.5±1.2,ODI(%)62.7±16.0,术后6个月VAS1.6±1.9,ODI(%)32.1±24.3,治疗效果明显,且无严重并发症,少数短期并发症可恢复。结论:O型臂引导下经皮椎间孔镜是治疗腰椎间盘突出症安全、有效的微创手术方式。     

Effective dose and image quality for intraoperative imaging with a cone-beam CT and a mobile multi-slice CT in spinal surgery: A phantom study

PurposeTo compare the effective dose (ED) and image quality (IQ) of O-arm cone-beam CT (Medtronic, Minneapolis, MN, USA) and Airo multi-slice CT (Brainlab AG, Munich, Germany) for intraoperative-CT (i-CT) in spinal surgery.MethodsThe manufacturer-defined protocols available in the O-arm and Airo systems for three-dimensional lumbar spine imaging were compared.Organ dose was measured both with thermo-luminescent dosimeters and GafChromic films in the Alderson Radiation Therapy anthropomorphic phantom.A subjective analysis was performed by neurosurgeons to compare the clinical IQ of the anthropomorphic phantom images acquired with the different i-CT systems and imaging protocols.Image uniformity, noise, contrast-to-noise-ratio (CNR), and spatial resolution were additionally assessed with the Catphan 504 phantom.ResultsO-arm i-CT caused 56% larger ED than Airo due to the high definition (HD) imaging protocol.The noise was larger for O-arm images leading to a lower CNR than that measured for Airo. Moreover, scattering and beam hardening effects were observed in the O-arm images. Better spatial resolution was measured for the O-arm system (9 lp/cm) than for Airo (4 lp/cm).For all the investigated protocols, O-arm was found to be better for identifying anatomical features important for accurate pedicle screw positioning.ConclusionsAccording to phantom measurements, the HD protocol of O-arm offered better clinical IQ than Airo but larger ED. The larger noise of O-arm images did not compromise the clinical IQ while the superior spatial resolution of this system allowed a better visibility of anatomical features important for pedicle screw positioning in the lumbar region.