The Adaptive Quality Control Phantom (AQCP) is a computer-controlled phantom which positions and moves a radioactive source in the Field of View (FOV) of an imaging nuclear medicine device on a definite path to produc...The Adaptive Quality Control Phantom (AQCP) is a computer-controlled phantom which positions and moves a radioactive source in the Field of View (FOV) of an imaging nuclear medicine device on a definite path to produce a spatial distribution of gamma rays to perform QC Tests such as the Collimator Hole Angulation (CHA) and the Center of Rotation (COR) of Single Photon Emission Computer Tomography (SPECT). The collimator hole angulation for six collimators was measured using a point source and a computer-controlled cylindrical positioning system. In this method, the displacement of the image of a point source was examined as the AQCP was moving point source vertically away from the collimator face. The results of the high-accuracy measurement method of CHA show that the measurement accuracy for absolute angulation errors is better than ±0.024°. The Root Mean Square (RMS) of CHA for LEHR, LEHS and LEUHR collimators of SMV dual heads camera and LEGP, MEGP and HEGP of GE Millennium MG were evaluated to be 0.290°, 0.292°, 0.208°, 0.154°, 0.220° and 0.202°, respectively. It is to be added in this connection that the evaluated RMS of CHA for LEHR collimator with the distance variation from the collimator’s surface ±1 mm has been varied ±0.04 degree. A new method for the center of rotation assessment by AQCP is introduced and the results of this proposed method as compared with the routine QC test and their differences are discussed in detail. We defined and measured a new parameter called Dynamic Mechanical Error (DME) for applying the gantry motion correction.展开更多
目的:探讨应用Ilizarov技术在旋转中心穹顶状截骨治疗青少年股骨远端外翻畸形的疗效。方法:采用回顾性研究分析2016年1月至2020年10月收治并获得完整随访的11例股骨远端外翻畸形患者的临床资料,其中男7例,女4例;右侧6例,左侧5例;年龄10...目的:探讨应用Ilizarov技术在旋转中心穹顶状截骨治疗青少年股骨远端外翻畸形的疗效。方法:采用回顾性研究分析2016年1月至2020年10月收治并获得完整随访的11例股骨远端外翻畸形患者的临床资料,其中男7例,女4例;右侧6例,左侧5例;年龄10~14岁。在股骨远端畸形处找出成角旋转中心(center of roration of angulation,CORA),以CORA为中点,行穹顶状截骨,根据Ilizarov外固定穿针原则安装环形外固定架,截断股骨远端,即时矫正股骨远端目测下外翻畸形,外固定架固定维持。术后根据双下肢负重全长正侧位X线片提示的下肢力线及长度结果,矫正残余畸形及短缩。结果:11例均得到随访,时间13~25个月,带架时间12~17周。末次随访拍摄双下肢负重全长正侧位X线片测量11例双下肢长度均等长,畸形均矫正。采用美国特种外科医院(Hospital Special Surgery,HSS)评分评价膝关节功能,均为优。结论:应用Ilizarov技术在旋转中心穹顶状截骨治疗青少年股骨远端外翻畸形,术中即时矫正目测下股骨外翻畸形,术后根据双下肢负重正侧位片提示的下肢力线及短缩程度,动态调整矫正残余畸形及短缩,损伤小,恢复快。展开更多
文摘The Adaptive Quality Control Phantom (AQCP) is a computer-controlled phantom which positions and moves a radioactive source in the Field of View (FOV) of an imaging nuclear medicine device on a definite path to produce a spatial distribution of gamma rays to perform QC Tests such as the Collimator Hole Angulation (CHA) and the Center of Rotation (COR) of Single Photon Emission Computer Tomography (SPECT). The collimator hole angulation for six collimators was measured using a point source and a computer-controlled cylindrical positioning system. In this method, the displacement of the image of a point source was examined as the AQCP was moving point source vertically away from the collimator face. The results of the high-accuracy measurement method of CHA show that the measurement accuracy for absolute angulation errors is better than ±0.024°. The Root Mean Square (RMS) of CHA for LEHR, LEHS and LEUHR collimators of SMV dual heads camera and LEGP, MEGP and HEGP of GE Millennium MG were evaluated to be 0.290°, 0.292°, 0.208°, 0.154°, 0.220° and 0.202°, respectively. It is to be added in this connection that the evaluated RMS of CHA for LEHR collimator with the distance variation from the collimator’s surface ±1 mm has been varied ±0.04 degree. A new method for the center of rotation assessment by AQCP is introduced and the results of this proposed method as compared with the routine QC test and their differences are discussed in detail. We defined and measured a new parameter called Dynamic Mechanical Error (DME) for applying the gantry motion correction.
文摘目的:探讨应用Ilizarov技术在旋转中心穹顶状截骨治疗青少年股骨远端外翻畸形的疗效。方法:采用回顾性研究分析2016年1月至2020年10月收治并获得完整随访的11例股骨远端外翻畸形患者的临床资料,其中男7例,女4例;右侧6例,左侧5例;年龄10~14岁。在股骨远端畸形处找出成角旋转中心(center of roration of angulation,CORA),以CORA为中点,行穹顶状截骨,根据Ilizarov外固定穿针原则安装环形外固定架,截断股骨远端,即时矫正股骨远端目测下外翻畸形,外固定架固定维持。术后根据双下肢负重全长正侧位X线片提示的下肢力线及长度结果,矫正残余畸形及短缩。结果:11例均得到随访,时间13~25个月,带架时间12~17周。末次随访拍摄双下肢负重全长正侧位X线片测量11例双下肢长度均等长,畸形均矫正。采用美国特种外科医院(Hospital Special Surgery,HSS)评分评价膝关节功能,均为优。结论:应用Ilizarov技术在旋转中心穹顶状截骨治疗青少年股骨远端外翻畸形,术中即时矫正目测下股骨外翻畸形,术后根据双下肢负重正侧位片提示的下肢力线及短缩程度,动态调整矫正残余畸形及短缩,损伤小,恢复快。
