2种SPECT联合质量控制与等效性比较

Comparison of joint quality control and equivalence between two SPECT machines

目的 :通过对国产NET632型可变角双探头SPECT和进口设备进行联合质量控制验证,从而评价其应用等效性。方法:以国产NET632型可变角双探头SPECT为试验设备,以进口Philips Brightview XCT为对照设备,对2台设备以相同质量控制方法进行试验前质控与试验中周质量控制,并记录和分析质控数据。结果:试验设备与对照设备的甲状腺模型静态成像图像和复杂性能模型断层成像试验图像质量基本相当,二者图像整体均符合要求,试验设备的噪声和冷区分辨略差于对照设备,热区分辨略好于对照设备;在试验前质量控制测试中,试验设备的固有均匀性明显好于对照设备,能量分辨率和最大观测计数率略好于对照设备;在试验中周质量控制中,试验设备的固有空间分辨力和线性略差于对照设备,非均匀性和能量分辨率好于对照设备。二者的质量控制指标整体上均符合要求。结论:国产NET 632型可变角双探头SPECT与进口设备具有等效性,可以适用于临床。

Objective To conduct a joint quality control between domestic dual-head variable-angle NET632 SPECT device and imported device to evaluate the application effectiveness. Methods The domestic NET632 SPECT was marked as the trial device, and the imported Philips Brightview XCT was marked as the comparative device. The same quality control methods were applied to the two devices for both pre-trial quality control and in-trial weekly quality control. The QC data were recorded and analyzed. Results Static images of a thyroid phantom and tomographic images of a complex performance phantom demonstrated nearly the same image quality. The images from both devices were within acceptable range. The noise and cold-region resolution of the trial devices were slightly worse while the hot-region resolution was slightly better than those of the comparative device. In the weekly QC procedures, slightly worse intrinsic spatial resolution and linearity, and better non-uniformity and energy resolution were observed on the trial device. All QC indices of both devices were within acceptable range. Conclusion The domestic dual-head NET632 SPECT has equivalent performances when compared with the imported device and is worthy applying clinically.