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. 2021 Sep 27;11(20):9721–9737. doi: 10.7150/thno.63860

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SPECT/CT fusion of the NEMA phantom acquired on the Discovery 670 (GE) with the HEGP collimator. Images are of A) Spheres filled with 40 kBq/mL of ²²³Ra; B) spheres filled with 35 kBq/mL of ²²⁵Ac, C) spheres filled with 40 kBq/mL of ²²⁷Th.