leadtools 加载dicom图像操作报写内存错误

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主要代码:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Leadtools;
using Leadtools.MedicalViewer;
using Leadtools.Codecs;
using Leadtools.Dicom;
namespace ViewerControl
{
public partial class Viewer:UserControl
{
      MedicalViewer _viewer = new MedicalViewer(2,2);
      public Viewer()
      {
         InitializeComponent();
         DicomEngine.Startup();
         _viewer.Dock = DockStyle.Fill;
         this.Controls.Add(_viewer);
         using (RasterCodecs codecs = new RasterCodecs())
         {
            using(DicomDataSet ds = new DicomDataSet())
            {
                  ds.Load(@"E:\ExportedImages\2\8600033_000002_02_01.dcm",DicomDataSetLoadFlags.None);
                  DicomElement element = ds.FindFirstElement(null, DicomTag.PixelData, true);
                  if (element != null)
                  {
                     //这句话报错
                     RasterImage image = ds.GetImage(element, 0, 0, RasterByteOrder.Gray,
                        DicomGetImageFlags.AutoApplyModalityLut | DicomGetImageFlags.AutoApplyVoiLut);
                     //end
                     _viewer.Cells.Add(new MedicalViewerCell(image));
                  }
            }

         }

      }
}
}