南方医科大学学报

南方医科大学学报 ›› 2014, Vol. 34 ›› Issue (08): 1181-.

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有效视野内检查床的变化对SPECT/CT同机配准度的影响

胡志辉，王思云，王淑侠，朱林波   

  • 出版日期:2014-08-20 发布日期:2014-08-20

Correlation of examination couch position and height with image registration accuracy in
an effective field of vision of SPECT/CT

  • Online:2014-08-20 Published:2014-08-20

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摘要： 目的探讨检查床位置的变化对SPECT/CT有效视野同机图像配准精度的影响及达到最佳配准效果时检查床的位置。方
法采用六个放射性点源153Gd（40.9 kev组、41.54 kev组、103.18 kev组，2个1组，共3个能量峰组）、标准模型，CT断层位置不变，
分别通过改变床位与床高，得到13组原始断层数据，利用仪器自带的ALIGNMENT软件获得配准度偏差，比较不同床位与床高
配准偏差值。结果最小配准度误差：Z轴在0 cm，Y轴在-4 cm处；即最佳的配准位置。结论进行SPECT断层与CT图像的同
机融合，如果两种图像达不到较佳融合，就必须进行图像配准度的质控，必要时进行图像配准度的校准。

Abstract: Objective To explore the correlation of the position and height of the examination couch with the accuracy of image
registration in an exact effective field of vision (FOV) of single photon emission computed tomography/computed tomography
(SPECT/CT) and determine the optimal position of the examination couch for best image registration. Methods The tests were
performed on a SPECT/CT with 6 radioactive 153Gd sources in 3 groups (two in each group with energy peak of 40.9 Kev, 41.54
Kev, and 103.18 Kev) in an assorted standard pattern. Thirteen groups of slice data were obtained by changing the position and
height of the bed but keeping the tomograpy slice constant. The bias of the accuracy of image registration was acquired using
ALIGNMENT software and compared for different examination couch positions and heights. Results The position of the
examination couch at 0 cm in the Z axis and -4 cm in the Y axis showed the least error of image registration. Conclusion To
achieve optimal SPECT and CT image fusion, quality control must be implemented and calibration of image registration
accuracy should be done when necessary.