unet_d8g_222f.py 文件源码

def get_pixels_hu(slices):
    image = np.stack([s.pixel_array for s in slices])
    image = image.astype(np.int16)

    # Set outside-of-scan pixels to 0
    # The intercept is usually -1024, so air is approximately 0
    image[image == -2000] = 0

    # Convert to Hounsfield units (HU)
    ### slope can differ per slice -- so do it individually (case in point black_tset, slices 95 vs 96)
    ### Changes/correction - 31.01.2017
    for slice_number in range(len(slices)):

        intercept = slices[slice_number].RescaleIntercept
        slope = slices[slice_number].RescaleSlope

        if slope != 1:
            image[slice_number] = slope * image[slice_number].astype(np.float64)
            image[slice_number] = image[slice_number].astype(np.int16)

        image[slice_number] += np.int16(intercept)    

    return np.array(image, dtype=np.int16)