[英]Manipulating and Converting PixelData of CT Image with fo-dicom in C#
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#. 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,然后使用C#中的Fellow Oak Dicom将其写回到文件中。 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. 经过一些研究,我发现我要处理的矩阵PixelData
存储在byte
PixelData
中的PixelData
的Buffer
中。 So I wrote following code: 所以我写了下面的代码:
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");
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. 这是我的第一次尝试,在AddOrUpdate
命令中遇到Exception
,因为它无法将byte
AddOrUpdate
转换为OB。 Reading eg Pianykh's book about DICOM, OB means Other Byte String . 读例如Pianykh关于DICOM的书,OB表示Other Byte String 。 But up to now I'm unable to convert the manipulated byte
-array to OB. 但是到目前为止,我仍无法将操作后的byte
数组转换为OB。 When I tried this code snippet: 当我尝试以下代码片段时:
DicomOtherByte dob = new DicomOtherByte(DicomTag.PixelData, pixDat);
ctFile.Dataset.AddOrUpdate<DicomOtherByte>(DicomTag.PixelData, dob);
the Exception
still is calling at AddOrUpdate
for being unable to convert the item to OB. Exception
仍在AddOrUpdate
上调用,因为无法将项目转换为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. 在这里在stackoverflow上搜索,或者在git或google中使用fo-dicom文档,我仍然不知道如何处理它。 So I'm wondering how to convert my manipulated matrix to OB, because I thought DicomOtherByte
is OB. 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。
EDIT: The Exception
is "Unable to create DICOM element of type OB with values of type Dicom.DicomOtherByte" - System.InvalidOperationException 编辑: 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
Thanks in advance. 提前致谢。
The pixel data in a Dicom Dataset is something very special. Dicom数据集中的像素数据非常特殊。 It cannot easily be read or written as a single Tag. 它不能轻易地作为单个标签读取或写入。 Fo-Dicom has special functions and classes to work with pixel data. Fo-Dicom具有用于处理像素数据的特殊功能和类。
Here is an example: 这是一个例子:
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");
Note that there more helper classes to work with pixel data directly in a specific format like PixelDataConverter
and PixelDataFactory
. 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。
Also, if you want to work with actual images, use the DicomImage
class. 另外,如果要使用实际图像,请使用DicomImage
类。
DicomImage image = new DicomImage(ctFile.Dataset);
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