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DCM文件转图像，并高清处理图像
#region DicomHandler 医学图像解析
class DicomHandler
{
string fileName = "";
Dictionary<string, string> tags = new Dictionary<string, string>();//dicom文件中的标签
BinaryReader dicomFile;//dicom文件流
//文件元信息
public Bitmap gdiImg;//转换后的gdi图像
UInt32 fileHeadLen;//文件头长度
long fileHeadOffset;//文件数据开始位置
UInt32 pixDatalen;//像素数据长度
long pixDataOffset = 0;//像素数据开始位置
bool isLitteEndian = true;//是否小字节序（小端在前 、大端在前）
bool isExplicitVR = true;//有无VR
//像素信息
int colors;//颜色数 RGB为3 黑白为1
public int windowWith = 2048, windowCenter = 2048 / 2;//窗宽窗位
int rows, cols;
public void readAndShow(out string textBox1)
{
textBox1 = "";
if (fileName == string.Empty)
{
textBox1 = "请选择文件";
}
else
{
dicomFile = new BinaryReader(File.OpenRead(fileName));
//跳过128字节导言部分
dicomFile.BaseStream.Seek(128, SeekOrigin.Begin);
if (new string(dicomFile.ReadChars(4)) != "DICM")
{
textBox1 = "没有dicom标识头，文件格式错误";
}
else
{
tagRead();
IDictionaryEnumerator enor = tags.GetEnumerator();
while (enor.MoveNext())
{
if (enor.Key.ToString().Length > 9)
{
textBox1 = enor.Key.ToString() "\r\n";
textBox1 = enor.Value.ToString().Replace('\0', ' ');
}
else
textBox1 = enor.Key.ToString() enor.Value.ToString().Replace('\0', ' ') "\r\n";
}
dicomFile.Close();
}
}
}
public DicomHandler(string _filename)
{
fileName = _filename;
}
public void saveAs(string filename)
{
switch (filename.Substring(filename.LastIndexOf('.')))
{
case ".jpg":
gdiImg.Save(filename, System.Drawing.Imaging.ImageFormat.Jpeg);
break;
case ".bmp":
gdiImg.Save(filename, System.Drawing.Imaging.ImageFormat.Bmp);
break;
case ".png":
gdiImg.Save(filename, System.Drawing.Imaging.ImageFormat.Png);
break;
default:
break;
}
}
public bool getImg()//获取图像 在图像数据偏移量已经确定的情况下
{
if (fileName == string.Empty)
return false;
int dataLen, validLen;//数据长度 有效位
int imgNum;//帧数
rows = int.Parse(tags["0028,0010"].Substring(5));
cols = int.Parse(tags["0028,0011"].Substring(5));
colors = int.Parse(tags["0028,0002"].Substring(5));
dataLen = int.Parse(tags["0028,0100"].Substring(5));
validLen = int.Parse(tags["0028,0101"].Substring(5));
gdiImg = new Bitmap(cols, rows);
BinaryReader dicomFile = new BinaryReader(File.OpenRead(fileName));
dicomFile.BaseStream.Seek(pixDataOffset, SeekOrigin.Begin);
long reads = 0;
for (int i = 0; i < gdiImg.Height; i )
{
for (int j = 0; j < gdiImg.Width; j )
{
if (reads >= pixDatalen)
break;
byte[] pixData = dicomFile.ReadBytes(dataLen / 8 * colors);
reads = pixData.Length;
Color c = Color.Empty;
if (colors == 1)
{
int grayGDI;
double gray = BitConverter.ToUInt16(pixData, 0);
//调窗代码，就这么几句而已
//1先确定窗口范围 2映射到8位灰度
int grayStart = (windowCenter - windowWith / 2);
int grayEnd = (windowCenter windowWith / 2);
if (gray < grayStart)
grayGDI = 0;
else if (gray > grayEnd)
grayGDI = 255;
else
{
grayGDI = (int)((gray - grayStart) * 255 / windowWith);
}
if (grayGDI > 255)
grayGDI = 255;
else if (grayGDI < 0)
grayGDI = 0;
c = Color.FromArgb(grayGDI, grayGDI, grayGDI);
}
else if (colors == 3)
{
c = Color.FromArgb(pixData[0], pixData[1], pixData[2]);
}
gdiImg.SetPixel(j, i, c);
}
}
dicomFile.Close();
return true;
}
void tagRead()//不断读取所有tag 及其值 直到碰到图像数据 (7fe0 0010 )
{
bool enDir = false;
int leve = 0;
StringBuilder folderData = new StringBuilder();//该死的文件夹标签
string folderTag = "";
while (dicomFile.BaseStream.Position 6 < dicomFile.BaseStream.Length)
{
//读取tag
string tag = dicomFile.ReadUInt16().ToString("x4") ","
dicomFile.ReadUInt16().ToString("x4");
string VR = string.Empty;
UInt32 Len = 0;
//读取VR跟Len
//对OB OW SQ 要做特殊处理 先置两个字节0 然后4字节值长度
//------------------------------------------------------这些都是在读取VR一步被阻断的情况
if (tag.Substring(0, 4) == "0002")//文件头 特殊情况
{
VR = new string(dicomFile.ReadChars(2));
if (VR == "OB" || VR == "OW" || VR == "SQ" || VR == "OF" || VR == "UT" || VR == "UN")
{
dicomFile.BaseStream.Seek(2, SeekOrigin.Current);
Len = dicomFile.ReadUInt32();
}
else
Len = dicomFile.ReadUInt16();
}
else if (tag == "fffe,e000" || tag == "fffe,e00d" || tag == "fffe,e0dd")//文件夹标签
{
VR = "**";
Len = dicomFile.ReadUInt32();
}
else if (isExplicitVR == true)//有无VR的情况
{
VR = new string(dicomFile.ReadChars(2));
if (VR == "OB" || VR == "OW" || VR == "SQ" || VR == "OF" || VR == "UT" || VR == "UN")
{
dicomFile.BaseStream.Seek(2, SeekOrigin.Current);
Len = dicomFile.ReadUInt32();
}
else
Len = dicomFile.ReadUInt16();
}
else if (isExplicitVR == false)
{
VR = getVR(tag);//无显示VR时根据tag一个一个去找 真烦啊。
Len = dicomFile.ReadUInt32();
}
//判断是否应该读取VF 以何种方式读取VF
//-------------------------------------------------------这些都是在读取VF一步被阻断的情况
byte[] VF = { 0x00 };
if (tag == "7fe0,0010")//图像数据开始了
{
pixDatalen = Len;
pixDataOffset = dicomFile.BaseStream.Position;
dicomFile.BaseStream.Seek(Len, SeekOrigin.Current);
VR = "UL";
VF = BitConverter.GetBytes(Len);
}
else if ((VR == "SQ" && Len == UInt32.MaxValue) || (tag == "fffe,e000" && Len == UInt32.MaxValue))//靠 遇到文件夹开始标签了
{
if (enDir == false)
{
enDir = true;
folderData.Remove(0, folderData.Length);
folderTag = tag;
}
else
{
leve ;//VF不赋值
}
}
else if ((tag == "fffe,e00d" && Len == UInt32.MinValue) || (tag == "fffe,e0dd" && Len == UInt32.MinValue))//文件夹结束标签
{
if (enDir == true)
{
enDir = false;
}
else
{
leve--;
}
}
else
VF = dicomFile.ReadBytes((int)Len);
string VFStr;
VFStr = getVF(VR, VF);
//----------------------------------------------------------------针对特殊的tag的值的处理
//特别针对文件头信息处理
if (tag == "0002,0000")
{
fileHeadLen = Len;
fileHeadOffset = dicomFile.BaseStream.Position;
}
else if (tag == "0002,0010")//传输语法 关系到后面的数据读取
{
switch (VFStr)
{
case "1.2.840.10008.1.2.1\0"://显示little
isLitteEndian = true;
isExplicitVR = true;
break;
case "1.2.840.10008.1.2.2\0"://显示big
isLitteEndian = false;
isExplicitVR = true;
break;
case "1.2.840.10008.1.2\0"://隐式little
isLitteEndian = true;
isExplicitVR = false;
break;
default:
break;
}
}
for (int i = 1; i <= leve; i )
tag = "--" tag;
//------------------------------------数据搜集代码
if ((VR == "SQ" && Len == UInt32.MaxValue) || (tag == "fffe,e000" && Len == UInt32.MaxValue) || leve > 0)//文件夹标签代码
{
folderData.AppendLine(tag "(" VR ")：" VFStr);
}
else if (((tag == "fffe,e00d" && Len == UInt32.MinValue) || (tag == "fffe,e0dd" && Len == UInt32.MinValue)) && leve == 0)//文件夹结束标签
{
folderData.AppendLine(tag "(" VR ")：" VFStr);
tags.Add(folderTag "SQ", folderData.ToString());
}
else
tags.Add(tag, "(" VR "):" VFStr);
}
}
string getVR(string tag)
{
switch (tag)
{
case "0002,0000"://文件元信息长度
return "UL";
break;
case "0002,0010"://传输语法
return "UI";
break;
case "0002,0013"://文件生成程序的标题
return "SH";
break;
case "0008,0005"://文本编码
return "CS";
break;
case "0008,0008":
return "CS";
break;
case "0008,1032"://成像时间
return "SQ";
break;
case "0008,1111":
return "SQ";
break;
case "0008,0020"://检查日期
return "DA";
break;
case "0008,0060"://成像仪器
return "CS";
break;
case "0008,0070"://成像仪厂商
return "LO";
break;
case "0008,0080":
return "LO";
break;
case "0010,0010"://病人姓名
return "PN";
break;
case "0010,0020"://病人id
return "LO";
break;
case "0010,0030"://病人生日
return "DA";
break;
case "0018,0060"://电压
return "DS";
break;
case "0018,1030"://协议名
return "LO";
break;
case "0018,1151":
return "IS";
break;
case "0020,0010"://检查ID
return "SH";
break;
case "0020,0011"://序列
return "IS";
break;
case "0020,0012"://成像编号
return "IS";
break;
case "0020,0013"://影像编号
return "IS";
break;
case "0028,0002"://像素采样1为灰度3为彩色
return "US";
break;
case "0028,0004"://图像模式MONOCHROME2为灰度
return "CS";
break;
case "0028,0010"://row高
return "US";
break;
case "0028,0011"://col宽
return "US";
break;
case "0028,0100"://单个采样数据长度
return "US";
break;
case "0028,0101"://实际长度
return "US";
break;
case "0028,0102"://采样最大值
return "US";
break;
case "0028,1050"://窗位
return "DS";
break;
case "0028,1051"://窗宽
return "DS";
break;
case "0028,1052":
return "DS";
break;
case "0028,1053":
return "DS";
break;
case "0040,0008"://文件夹标签
return "SQ";
break;
case "0040,0260"://文件夹标签
return "SQ";
break;
case "0040,0275"://文件夹标签
return "SQ";
break;
case "7fe0,0010"://像素数据开始处
return "OW";
break;
default:
return "UN";
break;
}
}
string getVF(string VR, byte[] VF)
{
string VFStr = string.Empty;
switch (VR)
{
case "SS":
VFStr = BitConverter.ToInt16(VF, 0).ToString();
break;
case "US":
VFStr = BitConverter.ToUInt16(VF, 0).ToString();
break;
case "SL":
VFStr = BitConverter.ToInt32(VF, 0).ToString();
break;
case "UL":
VFStr = BitConverter.ToUInt32(VF, 0).ToString();
break;
case "AT":
VFStr = BitConverter.ToUInt16(VF, 0).ToString();
break;
case "FL":
VFStr = BitConverter.ToSingle(VF, 0).ToString();
break;
case "FD":
VFStr = BitConverter.ToDouble(VF, 0).ToString();
break;
case "OB":
VFStr = BitConverter.ToString(VF, 0);
break;
case "OW":
VFStr = BitConverter.ToString(VF, 0);
break;
case "SQ":
VFStr = BitConverter.ToString(VF, 0);
break;
case "OF":
VFStr = BitConverter.ToString(VF, 0);
break;
case "UT":
VFStr = BitConverter.ToString(VF, 0);
break;
case "UN":
VFStr = Encoding.Default.GetString(VF);
break;
default:
VFStr = Encoding.Default.GetString(VF);
break;
}
return VFStr;
}
}
#endregion