def add_image(image)
      raise ArgumentError, "Invalid argument 'image'. Expected Image, got #{image.class}." unless image.is_a?(Image)
      @images << image
      @associated_images[image.uid] = image
    end
def add_image(image)
      raise ArgumentError, "Invalid argument 'image'. Expected Image, got #{image.class}." unless image.is_a?(Image)
      @images << image
      @associated_images[image.uid] = image
    end
Adds an Image to this CRSeries.

 @param [Image] image an image instance to be associated with this series