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. Author manuscript; available in PMC: 2021 Aug 1.
Published in final edited form as: IEEE Trans Med Imaging. 2021 Feb 2;40(2):699–711. doi: 10.1109/TMI.2020.3035253

Fig. 2. Details of our proposed joint spatial attention block.

Fig. 2

(a) SA 1 is a non-local block used at the lowest resolution level. (b) single-pathway spatial attention block (SA). (c) SA 2–4 are the dual-pathway attention blocks used in higher resolution levels. The query feature xh is used to calibrate the low-level key feature xl. δ means the Sigmoid function.