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. Author manuscript; available in PMC: 2021 May 12.
Published in final edited form as: Acad Radiol. 2018 Jul 31;26(4):544–549. doi: 10.1016/j.acra.2018.06.020

Figure 2.

Figure 2.

The contracting and expanding fully convolutional CNN architecture is composed entirely of 3 × 3 convolutions, a total of four strided convolutions (and convolutional transpose operations) instead of pooling layers and symmetric residual connections.