Correction to: EJNMMI Physics 9, 52 (2022) https://doi.org/10.1186/s40658-022-00481-z
Following publication of the original article , an error in Fig. 1 was reported by the authors. In the top blue box, the intensity of the 87.1 keV X-ray was quoted as 1.2%, but it should be 2.0%. The updated figure is provided in this correction article.
The authors would also like to specify that a scatter filter of 12 mm was used for all the SPECT images analysed. The ‘no filter’ results refer to images where no post-filter was applied.
The original article  has been updated.