在C#中使用fo-dicom处理和转换CT图像的PixelData

问题描述

对于某些测试，我试图操纵以dicom格式存储的CT图像的PixelData元素，并使用C#中的 Fellow Oak Dicom 将其写回到文件中.经过一些研究，我发现我要处理的矩阵位于存储在byte数组中的PixelData的Buffer中.所以我写了下面的代码:

For some tests I'm trying to manipulate the PixelData element of a CT image stored in dicom format and write it back in the file with Fellow Oak Dicom in C#. After some research I found out that the matrix I want to deal with is in the Buffer of PixelData stored in a byte-array. So I wrote following code:

DicomFile ctFile = DicomFile.Open(image);
var pixDat = ctFile.Dataset.Get<byte[]>(DicomTag.PixelData);

for (int i = 0; i < pixData.Length; i++)
{
    pixDat[i] = Convert.ToByte(200);
}

ctFile.Dataset.AddOrUpdate<byte[]>(DicomTag.PixelData, pixDat);
ctFile.Save("new file folder");

这是我的第一次尝试，在AddOrUpdate命令中得到了Exception，因为它无法将byte数组转换为OB.阅读例如Pianykh关于DICOM的书，OB表示 Other Byte String .但是到目前为止，我仍无法将操纵的byte数组转换为OB.当我尝试以下代码片段时:

This was my first try and I got an Exception at the AddOrUpdate command because it was unable to convert a byte-array to OB.Reading e.g. Pianykh's book about DICOM, OB means Other Byte String. But up to now I'm unable to convert the manipulated byte-array to OB. When I tried this code snippet:

DicomOtherByte dob = new DicomOtherByte(DicomTag.PixelData, pixDat);
ctFile.Dataset.AddOrUpdate<DicomOtherByte>(DicomTag.PixelData, dob);

Exception仍在调用AddOrUpdate，因为无法将项目转换为OB.在这里在stackoverflow上搜索，在git或google中的fo-dicom文档中，我仍然不知道如何处理它的线索.所以我想知道如何将操纵矩阵转换为OB，因为我认为DicomOtherByte是OB.

the Exception still is calling at AddOrUpdate for being unable to convert the item to OB. Searching here at stackoverflow, fo-dicom documentation in git or with google I still didn't get a clue how to deal with it. So I'm wondering how to convert my manipulated matrix to OB, because I thought DicomOtherByte is OB.

Exception是无法创建类型为Dicom.DicomOtherByte类型的值的OB类型的DICOM元素"-System.InvalidOperationException

The Exception is "Unable to create DICOM element of type OB with values of type Dicom.DicomOtherByte" - System.InvalidOperationException

谢谢.

推荐答案

Dicom数据集中的像素数据非常特殊.它不能轻易地作为单个标签读取或写入. Fo-Dicom具有用于处理像素数据的特殊功能和类.

The pixel data in a Dicom Dataset is something very special. It cannot easily be read or written as a single Tag. Fo-Dicom has special functions and classes to work with pixel data.

这里是一个例子:

DicomFile ctFile = DicomFile.Open(@"C:\Temp\original.dcm");

// Create PixelData object to represent pixel data in dataset
DicomPixelData pixelData = DicomPixelData.Create(ctFile.Dataset);
// Get Raw Data
byte[] originalRawBytes = pixelData.GetFrame(0).Data;

// Create new array with modified data
byte[] modifiedRawBytes = new byte[originalRawBytes.Length];
for (int i = 0; i < originalRawBytes.Length; i++)
{
    modifiedRawBytes[i] = (byte)(originalRawBytes[i] + 100);
}

// Create new buffer supporting IByteBuffer to contain the modified data
MemoryByteBuffer modified = new MemoryByteBuffer(modifiedRawBytes);

// Write back modified pixel data
ctFile.Dataset.AddOrUpdatePixelData(DicomVR.OB, modified);

ctFile.Save(@"C:\Temp\Modified.dcm");

请注意，还有更多的帮助程序类可以直接以特定格式(例如PixelDataConverter和PixelDataFactory)处理像素数据.

Note that there more helper classes to work with pixel data directly in a specific format like PixelDataConverter and PixelDataFactory.

此外，如果要处理实际图像，请使用DicomImage类.

Also, if you want to work with actual images, use the DicomImage class.

DicomImage image = new DicomImage(ctFile.Dataset);

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