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首页> 外文期刊>World Journal of Nuclear Science and Technology >The Precise Methods for the Measurement of Collimator Hole Angulation and Center of Rotation of SPECT by Adaptive Quality Control Phantom
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The Precise Methods for the Measurement of Collimator Hole Angulation and Center of Rotation of SPECT by Adaptive Quality Control Phantom

机译：自适应质量控制模型精确测量准直器孔角和SPECT旋转中心的方法

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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.
机译：自适应质量控制幻像（AQCP）是一种计算机控制的幻像，它在确定的路径上在成像核医学设备的视场（FOV）中定位和移动放射源，以产生伽马射线的空间分布以执行QC诸如单光子发射计算机断层扫描（SPECT）的准直器孔角度（CHA）和旋转中心（COR）等测试。使用点源和计算机控制的圆柱定位系统测量了六个准直仪的准直仪孔角度。在这种方法中，当AQCP将点源垂直移离准直仪表面时，检查了点源图像的位移。 CHA的高精度测量方法的结果表明，绝对角度误差的测量精度优于±0.024°。 SMV双头相机的LEHR，LEHS和LEUHR准直器以及GE Millennium MG的LEGP，MEGP和HEGP的CHA的均方根（RMS）分别为0.290°，0.292°，0.208°，0.154°，0.220°和分别为0.202°。在这方面要补充的是，对于LEHR准直仪的CHA的RMS均方根值与准直仪表面的距离变化为±1 mm，已更改为±0.04度。介绍了一种通过AQCP评估旋转中心的新方法，并与常规QC测试进行了比较，详细讨论了该方法的结果。我们定义并测量了一个新的参数，称为动态机械误差（DME），用于应用机架运动校正。

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