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. 2022 Apr 14;25(2):351–358. doi: 10.1038/s41391-022-00534-5

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© The Author(s) 2022

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — The A,B,C, D-1 were the maximum intensity projection (MIP) images; The A,B,C, D-2 were the cross sections of PET; and the A,B,C, D-3 were the cross sections of fusion images. The A, C-1, 2, 3 were for the early phase, and the B, D-1, 2, 3 were for delay phase. The A and B were the dual-phase ¹⁸F-DCFPyL PET/CT scan for a retroperitoneal lymph node metastasis. The short diameter of this lymph node was about 7 mm, SUVmax early was 3.0, SUVmax delay was 3.8, △SUVmax was 0.8, RI was 26.7%, SUV ratio early was 5.0, SUV ratio delay was 12.7, and ratio(SUV ratio delay/early) was 2.54. The C and D were the dual-phase ¹⁸F-DCFPyL PET/CT scan for a reactive hyperplastic lymph node. The short diameter of this lymph node was about 7 mm, SUVmax early was 2.1, SUVmax delay was 1.7, △SUVmax was -0.4, RI was -19.0%, SUV ratio early was 3.5, SUV ratio delay was 3.4, and ratio (SUV ratio delay/early) was 0.97.