code: function hasVoi (viewport) {
    const hasLut = viewport.voiLUT && viewport.voiLUT.lut && viewport.voiLUT.lut.length > 0;
  
    return hasLut || (viewport.voi.windowWidth !== undefined && viewport.voi.windowCenter !== undefined);
  }
docs: Check if viewport has voi LUT data
  @param {any} viewport The viewport to check for voi LUT data
  @returns {Boolean} true viewport has LUT data (Window Width/Window Center or voiLUT). Otherwise, false.
  @memberof Internal