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. 2021 May;9(9):819. doi: 10.21037/atm-20-3345

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2021 Annals of Translational Medicine. All rights reserved.

Open Access Statement: This is an Open Access article distributed in accordance with the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License (CC BY-NC-ND 4.0), which permits the non-commercial replication and distribution of the article with the strict proviso that no changes or edits are made and the original work is properly cited (including links to both the formal publication through the relevant DOI and the license). See: https://creativecommons.org/licenses/by-nc-nd/4.0.

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Training data and statistics. (A) Generated random 2-D head phantoms by custom software. The first row shows the activity images. The high-uptake area is assigned to 3–9 and the rest area in the head is assigned to one. The background is zero. The second row shows the attenuation map image corresponding to the first row. (B) The number of phantoms meets standard normal distribution according to the assigned values of the high-uptake area in the activity image. Assigned value equal to 6 is the most cases in the database.