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. 2023 Mar 25;10:24. doi: 10.1186/s40658-023-00541-y

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© The Author(s) 2023

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Polar Map representations of the Data Spectrum LV insert phantom filled with ^99mTc (left upper row) and ¹²³I (right upper row) measured with the AnyScan SC with LEHR 16 min acquisition and the AnyScan TRIO with MPH-Cardiac collimator 4 min acquisition. Short axis images of the reconstructed LV inserts are presented for the ^99mTc (left lower row) and ¹²³I (right lower row) measurements. Half-moon shaped ROI was applied on both the myocardium region of the phantom (green) and a circular ROI within the LV cavity (yellow). These ROIs were applied on all four LV SPECT images and CNR values were calculated based on Eq. 3