For a 3D C-arm computed tomography(CT) system, actual path of the scanner may deviate from the idea circle geometry because of mechanicalinstability,leading to perturbation artifacts in reconstructed images. In this p...For a 3D C-arm computed tomography(CT) system, actual path of the scanner may deviate from the idea circle geometry because of mechanicalinstability,leading to perturbation artifacts in reconstructed images. In this paper, we proposed a modified FBP method for the perturbed trajectories taking into account 6 perturbation parameters without tassuming any condition to be ideal. The preliminary studies demonstrated that this algorithm can acquire promising reconstruction image quality even when the perturbations are relatively large. The comparison of performances among different perturbation parameters is useful for constructing a C-arm CT system.展开更多
目的探讨C臂CT引导下经皮三叉神经半月节球囊压迫术治疗三叉神经痛的应用价值。方法回顾性分析采用C臂CT(Xper-CT)引导下经皮三叉神经半月节球襄压迫术治疗三叉神经痛患者40例,所有患者均进行C臂CT程序扫描,并通过X-travision工作站进...目的探讨C臂CT引导下经皮三叉神经半月节球囊压迫术治疗三叉神经痛的应用价值。方法回顾性分析采用C臂CT(Xper-CT)引导下经皮三叉神经半月节球襄压迫术治疗三叉神经痛患者40例,所有患者均进行C臂CT程序扫描,并通过X-travision工作站进行颅骨后处理重建,引导穿刺针进入卵圆孔及球囊到位,确定球囊头端位于Meckel’s腔,充盈球囊。术后记录手术剂量面积乘积(dose area product,DAP)、空气比释动能(cumulative air kerma,CAK)、曝光时间(fluo time,FT),分析辐射剂量。结果40例患者均通过C臂CT后处理重建技术引导卵圆孔穿刺成功(其中小卵圆孔2例);40例患者中通过C臂CT后处理重建技术确定球囊一次性到位并获得满意梨形21例(52%),通过C臂CT后处理重建技术分析后多次调整球囊位置及方向,使球囊头端位于岩骨切迹,并获得满意梨形12例(30%),7例(18%)患者未获得满意梨形。术后40例患者疼痛完全消失17例(42%),疼痛满意缓解21例(53%);疼痛缓解不满意2例(5%);总有效率95%。术后伴面部麻木26例(65%),咀嚼肌无力9例(23%)。40例患者DAP、CAK、FT分别为(79.39±23.15)Gycm^(2)、(245.07±84.04)mGy、(5.20±1.30)min。结论C臂CT引导下经皮三叉神经半月节球囊压迫术直观准确显示穿刺针、卵圆孔、球囊、岩骨脊的三维结构及其相互位置关系,尤其对解剖变异或异常增生的显示更具优势。展开更多
基金Doctoral Program of Higher Education of Chinagrant number:20093218110024+1 种基金International Science and Technology Cooperation Grantgrant number:BZ2008060
文摘For a 3D C-arm computed tomography(CT) system, actual path of the scanner may deviate from the idea circle geometry because of mechanicalinstability,leading to perturbation artifacts in reconstructed images. In this paper, we proposed a modified FBP method for the perturbed trajectories taking into account 6 perturbation parameters without tassuming any condition to be ideal. The preliminary studies demonstrated that this algorithm can acquire promising reconstruction image quality even when the perturbations are relatively large. The comparison of performances among different perturbation parameters is useful for constructing a C-arm CT system.
文摘目的探讨C臂CT引导下经皮三叉神经半月节球囊压迫术治疗三叉神经痛的应用价值。方法回顾性分析采用C臂CT(Xper-CT)引导下经皮三叉神经半月节球襄压迫术治疗三叉神经痛患者40例,所有患者均进行C臂CT程序扫描,并通过X-travision工作站进行颅骨后处理重建,引导穿刺针进入卵圆孔及球囊到位,确定球囊头端位于Meckel’s腔,充盈球囊。术后记录手术剂量面积乘积(dose area product,DAP)、空气比释动能(cumulative air kerma,CAK)、曝光时间(fluo time,FT),分析辐射剂量。结果40例患者均通过C臂CT后处理重建技术引导卵圆孔穿刺成功(其中小卵圆孔2例);40例患者中通过C臂CT后处理重建技术确定球囊一次性到位并获得满意梨形21例(52%),通过C臂CT后处理重建技术分析后多次调整球囊位置及方向,使球囊头端位于岩骨切迹,并获得满意梨形12例(30%),7例(18%)患者未获得满意梨形。术后40例患者疼痛完全消失17例(42%),疼痛满意缓解21例(53%);疼痛缓解不满意2例(5%);总有效率95%。术后伴面部麻木26例(65%),咀嚼肌无力9例(23%)。40例患者DAP、CAK、FT分别为(79.39±23.15)Gycm^(2)、(245.07±84.04)mGy、(5.20±1.30)min。结论C臂CT引导下经皮三叉神经半月节球囊压迫术直观准确显示穿刺针、卵圆孔、球囊、岩骨脊的三维结构及其相互位置关系,尤其对解剖变异或异常增生的显示更具优势。
