public virtual DCMAbstractType Decode(byte[] data, ref uint idx)
{
DCMDataElement element = new DCMDataElement();
//vrdecoder = new US(this);
//读取TAG
element.gtag = vrdecoder.GetUShort(data, ref idx);
element.etag = vrdecoder.GetUShort(data, ref idx);
if (element.gtag == 0xfffe && element.etag == 0xe000) //处理SQ的三个特殊标记
{
DCMDataItem sqitem = new DCMDataItem(this);
uint length = vrdecoder.GetUInt(data, ref idx); //不能用GetLength
uint offset = idx;
while (idx - offset < length)
{
DCMAbstractType sqelem = Decode(data, ref idx); //递归
if (length == 0xffffffff && sqelem.gtag == 0xfffe && sqelem.etag == 0xe00d) //条目结束标记
{
break;
}
sqitem.items.Add(sqelem);
}
return(sqitem);
}
else if (element.gtag == 0xfffe && element.etag == 0xe0dd) //序列结束标记
{
element.vr = "UL";
element.length = vrdecoder.GetUInt(data, ref idx); //不能用GetLength
return(element);
}
//查数据字典得到VR,Name,VM
element.vr = vrdecoder.GetVR(data, ref idx);
DicomDictionaryEntry entry = dictionary.GetEntry(element.gtag, element.etag);
if (entry != null)
{
if (element.vr == "")
{
element.vr = entry.VR;
}
element.name = entry.Keyword;
element.vm = entry.VM;
}
else if (element.vr == "" && element.etag == 0)
{
element.vr = "US";
}
//根据得到的VR实例化具体vr类，此处暂时用vrdecode(即US类对象)
element.vrparser = vrfactory.GetVR(element.vr);
vrdecoder = element.vrparser;
//读取值长度
element.length = vrdecoder.GetLength(data, ref idx);
//读取值
element.value = vrdecoder.GetValue(data, ref idx, element.length);
return(element);
}
public DicomDictionary()
{
string[] line = File.ReadAllLines(@"D:\learning\医用软件设计\实验\实验1\dicom.txt");
for (int i = 0; i < line.Length; i++)
{
DicomDictionaryEntry myEntry = new DicomDictionaryEntry();
string[] oneline;
oneline = line[i].Split('\t');
myEntry.Tag = oneline[0];
myEntry.Name = oneline[1];
myEntry.Keyword = oneline[2];
myEntry.VR = oneline[3];
myEntry.VM = oneline[4];
dicomlist.Add(myEntry);
}
}
public DicomDictionaryEntry GetEntry(ushort gtag, ushort etag)
{
DicomDictionaryEntry entry = new DicomDictionaryEntry();
string str = null;
str = "(" + gtag.ToString("X4") + "," + etag.ToString("X4") + ")";
string tag = "\"" + str + "\"";
for (int i = 0; i < dicomlist.Count; i++)
{
if (dicomlist[i].Tag == tag)
{
entry = dicomlist[i];
break;
}
}
return(entry);
}
