I am working with DCMTK to modify an input DICOM file.
This is a Multi-Frame DICOM file on my disk. I need to add new frames into the PixelData element, and save the output using the same input filename.
The restriction is that I can not load the whole PixelData in memory. I would like to append new frame to the end of DICOM file, directly. Does anyone have any idea on how to do this ?
Too bad you are using DCMTK, if instead you were using GDCM, you could simply instantiate the FileStreamer class and append any Pixel Data chunk you would like:
See FileStreamer documentation.
Related
I have read the FileWriter Filter :
" The File Writer filter can be used to write files to disc regardless of format. The filter simply writes to disc whatever it receives on its input pin, so it must be connected upstream to a multiplexer that can format the file correctly. You can create a new output file with the File Writer or specify an existing file; if the file already exists, it will be completely overwritten with the new data. "
So my question is :
I am using the FileWriter filter for writing my audio stream into the disc. Before writing the file in the disc i want to access that file , so can it be possible or should i make my own custom filter.
File writer filter does not not provide you with options to change file sharing mode while the file is being written to. Additionally, in most cases your accessing the file before it is finalized makes no sense: the files are rarely written incrementally, file finalization changes data in the middle of the file and your accessing data before the file is closed might get you bad/incomplete stream.
Roman R is right. Writers are for writing. If you need transform data - write your own Transform filter.
You can ask me directly here.
I am trying to create a new DICOM file from an existing DICOM file. So, the scenario is that I have a DICOM file and I do some image processing on it and produce a transformed/processed file and I would like to save it using the original file as a template.
The only things that change are
1: The pixel data
2: The rescale and offset tags.
Does anyone know how I can achieve this with DCMTK? I looked at various examples but most of them show how to save a JPG or BMP image into a new DICOM file.
If you modify the image data (Pixel Data), you should save the new dataset with new Series Instance UID and SOP Instance UID. In addition, you should also update the first value of Image Type (0008, 0008) to “DERIVED” to reflect that image is not the original image. The second value Image Type tag can be “PRIMARY” or “SECONDARY” depending on the patient examination characteristics. You can also use Derivation Description (0008, 2111) and Derivation Code Sequence (0008,9215) to describe the way in which the image was derived. In addition, you can also reference the source image(s) used to create the Derived image by adding optional Source Image Sequence (0008,2112) which can hold a list of Referenced SOP Class UID (0008,1150)/ Referenced SOP Instance UID (0008,1150) pair(s).
Kinldy check dcmodify executable and check the help in command, it has the option to modify the tags.
For anything but pixel data dcmodify is the tool of your choice.
For the pixel data you can use dcmdump to extract the pixel data to a RAW file, change it and use dump2dcm to re-integrate it into the DICOM file
I'm wondering if it's possible to read from a bytestream without saving it.
I have a file, wich is a PDF that's in a mailbox. Through code I can access this mailbox and read out the attachements in it (the pdf's) At that point every pdf is in a bystream.
For now I just save it locally to test if my code works. But I need to work without saving the file.
Is there a way so I can get data from that file without saving. I need to process the first page and find the image in there (which is a qr code).
I have code to do this from a local file, but I want this to be directly from on of those in the bystreams.
Can I store the bytesteam in something like an object or a list of bytestreams and use that?
I am working on Windows Application development using c#. I want to read a csv file from a directory and imported into sql server database table. I am successfully read and import the csv file data into database table if the file content is uniform. But I am unable to insert the file data with invariant form ex.Actually my csv file delimiter is tab('\t') and after getting individual fields I have a field that contains data like dcc
Name
----
xxx
xxx yyy
xx yy zz
and i rerieved data like xxx,yyy and xx,yy,zz so the insertion becomes problem.
How could i insert the data uniformly into a database table.
It's pretty easy.
Just read file line-by-line. Example on MSDN here:
How to: Read Text from a File
For each line use String.Split Method with your tab as delimiter. Method documentation and sample are here:
String.Split Method (Char[], StringSplitOptions)
Then working insert your data.
If a CSV (or TSV) value contains a delimiter inside of it, then it should be surrounded by quotes. See the spec for more details: https://www.rfc-editor.org/rfc/rfc4180#page-3
So your input file is incorrectly formatted. If you can convince the input provider to fix this issue, that will be the best way to fix the problem. If not, other solutions may include:
visually inspecting and editing the file to fix errors, or
writing your parser program to have enough knowledge of your data expectations that it can correctly "guess" where the real delimiters are.
If I'm understanding you correctly, the problem is that your code is splitting on spaces instead of on tabs. Given you have read in the lines from the file, all you need to do is:
string[] fileLines;//from the file
foreach(string line in fileLines)
{
string[] lineParts=line.Split(new char[]{'\t'});
}
and then do whatever you want with each lineParts. The \t is the tab character.
If you're also asking about writing the lines to a database file...you can just read in tab-delimited files with the Import Export Wizard (assuming you're using Sql Server Mgmt Studio, but I'm sure there are comparable ways to import using other db management software).
I am creating an xml file. I need to check first if the file exists or not. If the file does not exist, create it and add the data cmg from a .cs file.
If the file exists, don't create the file just add the data cmg from a .cs file.
My code looks like this:
string filename="c:\\employee.xml";
XmlTextWriter tw=new XmlTextWriter(filename,null);//null represents
the Encoding Type//
tw.Formatting=Formatting.Indented; //for xml tags to be indented//
tw.WriteStartDocument(); //Indicates the starting of document (Required)//
tw.WriteStartElement("Employees");
tw.WriteStartElement("Employee","Genius");
tw.WriteStartElement("EmpID","1");
tw.WriteAttributeString("Name","krishnan");
tw.WriteElementString("Designation","Software Developer");
tw.WriteElementString("FullName","krishnan Lakshmipuram Narayanan");
tw.WriteEndElement();
tw.WriteEndElement();
tw.WriteEndDocument();
tw.Flush();
tw.Close();
so next time we add data to file we need to check if the file exits and add data to xml file
and as we have made empID as a primary key, if user tries to make duplicate entry we need to avoid
Is this possible to do?
if (!File.Exists(filename))
{
// create your file
}
or
if (File.Exists(filename))
{
File.Delete(filename);
}
// then create your file
File class is in System.IO namespace (add using System.IO; to your file)
You can't append records to an XML file, you have to read the file and then rewrite it.
So, just check if the file exists, and read the records from it. Then write the file including all previous records and the new record.
Have a look at the File.Exists method here
Testing for existance of a file before attempting to create it inherently is subject to a "things change after check" race condition. Who can guarantee you that your application isn't preempted and put to sleep for a moment after you checked, someone else creates/deletes that file, your app gets to run again and does exactly the opposite of what you intended ?
Windows (as well as all UN*X variants) supports file open/create modes that allow to perform that create-if-nonexistant/open-if-existant operation as a single call.
As far as .NET goes, this means for your task (create an XML file) you'd first create a System.IO.FileStream with the appropriate modes, see http://msdn.microsoft.com/en-us/library/system.io.filemode.aspx and then pass that stream to the XmlWriter constructor. That's safer than simply performing an "exists" check and hoping for the best.