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Image preprocessing steps may be involved in different tasks. (a: original lung; b: lung HU setting; c: lung window/level setting; d: lung resampling; e1: lung parenchyma segmentation; e2: lung nodule extraction (32 × 32 and 64 × 64 are the example size); f: resizing lung (256 × 256 and 224 × 224 are the example size); g: normalizing).
