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推导了恢复型滤波函数（Ｍｅｔｚ滤波函数），探讨了其在ＳＰＥＣＴ重建中应用的最佳条件，并与平滑型滤波函数重建结果作了对比．表明Ｍｅｔｚ波函数在ＳＰＥＣＴ断层重建中的最佳条件为１．５×１０５计数，对应的可变参数Ｘ＝５．其重建图像与用平滑型滤波函数的重建图像相比＂对比度／噪声＂平均提高３．０，断层分辨率改善２０％，散射线减少１８％，ＳＰＥＣＴ重建图像的质量改善显著．
The recovery filter function (Metz filter function) is deduced. The optimal conditions for its application in SPECT reconstruction are discussed and compared with those of the smoothing filter function reconstruction. The results show that the best condition of Metz wave function in SPECT tomography reconstruction is 1.5 × 105 counts, corresponding to the variable parameter X = 5. Compared with the reconstructed image with smoothing filter function, the reconstructed image improved the contrast / noise by 3.0 on average, improved the resolution of the fault by 20% and the scattering line by 18%, and the quality of the SPECT reconstructed image improved significantly.