如何保存一张2GB的DCM图像，putAndInsertUint8Arrar()；图像为2GB时，报错提示内存不足

void CProcessCommDlg::OnBnClickedButtonDcm()
{
    // TODO: 在此添加控件通知处理程序代码
    UpdateData(TRUE);
    DcmFileFormat fileformat;
    DcmDataset *pDataset = fileformat.getDataset();
    CString strRawPath, strDCMPath, strTmp;
    strRawPath.Format("D:\\TestImg\\%d.raw",g_imgNum);
    strDCMPath.Format("D:\\TestImg\\%d.dcm", g_imgNum);
    //OFCondition oc = fileformat.loadFile(strRawPath);
    int imgSize = m_nImgWidth*m_nImgWidth * 2;
    BYTE *pRaw = nullptr;
    try
    {
         pRaw= new BYTE[imgSize];
        memset(pRaw, 0, imgSize);
        //delete[]pRaw;
        FILE*fp = fopen(strRawPath,"r");
        if (fp == NULL)
        {
            delete[]pRaw;
            return;
        }
        fread(pRaw,sizeof(BYTE),imgSize,fp);
        fclose(fp);
        SetDlgItemText(IDC_STATIC_STATA, "文件写完");

    }
    catch (CMemoryException* e)
    {
        CString strErr;
        e->GetErrorMessage(strErr.GetBuffer(MAX_PATH), MAX_PATH, 0);
        AfxMessageBox(strErr);
        strErr.ReleaseBuffer();
        return;
    }

    //if (oc.good()) 
    {
        OFString strTagValue;
        AddDcmElements(pDataset);

        // 新名字
        if (fileformat.getDataset()->putAndInsertString(DCM_PatientName, "John Doe").good())
        {
            fileformat.getDataset()->findAndGetOFString(DCM_PatientName, strTagValue);
            cout << "Patient New Name:" << strTagValue.data() << endl;
        }
        // 修改窗宽窗位
        if (fileformat.getDataset()->putAndInsertString(DCM_WindowCenter, "30000").good())
        {
            fileformat.getDataset()->findAndGetOFString(DCM_WindowCenter, strTagValue);
            cout << "窗位:" << strTagValue.data() << endl;
        }
        if (fileformat.getDataset()->putAndInsertString(DCM_WindowWidth, "60000").good())
        {
            fileformat.getDataset()->findAndGetOFString(DCM_WindowCenter, strTagValue);
            cout << "窗宽:" << strTagValue.data() << endl;
        }
        // 修改宽高
        if (fileformat.getDataset()->putAndInsertString(DCM_Rows, "3072").good())
        {
            fileformat.getDataset()->findAndGetOFString(DCM_Rows, strTagValue);
            cout << "Rows:" << strTagValue.data() << endl;
        }
        if (fileformat.getDataset()->putAndInsertString(DCM_Columns, "3072").good())
        {
            fileformat.getDataset()->findAndGetOFString(DCM_Columns, strTagValue);
            cout << "Columns:" << strTagValue.data() << endl;
        }

        // 保存新的dcm
        OFCondition status = pDataset->putAndInsertUint8Array(DCM_PixelData, (Uint8 *)pRaw, imgSize, true);
        if (status.good())
        {
            strTmp.Format("%s", status.text());
            AfxMessageBox(strTmp);
            status = fileformat.saveFile(strDCMPath, EXS_LittleEndianExplicit);
            //status = fileformat.saveFile(strDCMPath, EXS_JPEGProcess14SV1TransferSyntax);
            if (status.bad())
            {
                strTmp.Format("DCM file create failed,%s", status.text());
                AfxMessageBox(strTmp);
            }
        }
        else
        {
            strTmp.Format("putAndInsertUint8Array error,%s", status.text());
            AfxMessageBox(strTmp);
        }
    }


    delete[]pRaw;

}

这段代码是什么意思啊，有写看不懂

1.有些是从网上复制的，不合用的加上了//；
2.大致逻辑是，从本地硬盘读取raw格式图像(我定义的尺寸是20000*20000*2),；
3.通过DCMTK接口，编辑头信息AddDcmElements(pDataset)；是从网上copy的；
4.putAndInsertUint8Array（）运行报错，virtual memory exhaust(内存耗尽)，不太明白原因，但是当我将raw图像的尺寸定义成3072*3072*2时，是可以的，能正常生成DCM图像