Method: RTKIT::Image#load_pixel_data

Defined in:
lib/rtkit/image.rb

#load_pixel_data(dcm) ⇒ Object

Transfers the pixel data, as well as the related image properties and the DObject instance itself, to the Image instance.

Parameters

  • dcm – A DICOM object containing image data that will be applied to the Image instance.

Raises:



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# File 'lib/rtkit/image.rb', line 162

def load_pixel_data(dcm)
  raise ArgumentError, "Invalid argument 'dcm'. Expected DObject, got #{dcm.class}." unless dcm.is_a?(DICOM::DObject)
  raise ArgumentError, "Invalid argument 'dcm'. Expected an image related modality, got #{dcm.value(MODALITY)}." unless IMAGE_MODALITIES.include?(dcm.value(MODALITY))
  # Set attributes common for all image modalities, i.e. CT, MR, RTDOSE & RTIMAGE:

  @dcm = dcm
  @narray = dcm.narray
  @date = dcm.value(IMAGE_DATE)
  @time = dcm.value(IMAGE_TIME)
  @uid = dcm.value(SOP_UID)
  @columns = dcm.value(COLUMNS)
  @rows = dcm.value(ROWS)
  # Some difference in where we pick our values depending on if we have an RTIMAGE or another type:

  if @series.modality == 'RTIMAGE'
    image_position = dcm.value(RT_IMAGE_POSITION).split("\\")
    raise "Invalid DICOM image: 2 basckslash-separated values expected for RT Image Position (Patient), got: #{image_position}" unless image_position.length == 2
    @pos_x = image_position[0].to_f
    @pos_y = image_position[1].to_f
    @pos_slice = nil
    spacing = dcm.value(IMAGE_PLANE_SPACING).split("\\")
    raise "Invalid DICOM image: 2 basckslash-separated values expected for Image Plane Pixel Spacing, got: #{spacing}" unless spacing.length == 2
    @col_spacing = spacing[1].to_f
    @row_spacing = spacing[0].to_f
  else
    image_position = dcm.value(IMAGE_POSITION).split("\\")
    raise "Invalid DICOM image: 3 basckslash-separated values expected for Image Position (Patient), got: #{image_position}" unless image_position.length == 3
    @pos_x = image_position[0].to_f
    @pos_y = image_position[1].to_f
    self.pos_slice = image_position[2].to_f
    spacing = dcm.value(SPACING).split("\\")
    raise "Invalid DICOM image: 2 basckslash-separated values expected for Pixel Spacing, got: #{spacing}" unless spacing.length == 2
    @col_spacing = spacing[1].to_f
    @row_spacing = spacing[0].to_f
    raise "Invalid DICOM image: Direction cosines missing (DICOM tag '#{IMAGE_ORIENTATION}')." unless dcm.exists?(IMAGE_ORIENTATION)
    @cosines = dcm.value(IMAGE_ORIENTATION).split("\\").collect {|val| val.to_f} if dcm.value(IMAGE_ORIENTATION)
    raise "Invalid DICOM image: 6 values expected for direction cosines (DICOM tag '#{IMAGE_ORIENTATION}'), got #{@cosines.length}." unless @cosines.length == 6
  end
end