How to get data from dcm which PR = 1?

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kamil · #1 Post by **kamil** » Fri, 2009-06-19, 03:36

I can't get the size of the pixel data from dcm files which PR =1 using getOutPutDataSize(), how to get its size and data?

Thank you!

I have solved this problem, when PR = 1, the function "getOutPutDateSize()" return the double size of Pixel Size, because of 2's complement integer.

#2 Post by **Jörg Riesmeier** » Fri, 2009-06-19, 08:34

No, getOutputData() always returns unsigned pixel data even if the original pixel data is signed (because the output of the VOI LUT transformation is always unsigned).

kamil · #3 Post by **kamil** » Fri, 2009-06-19, 18:34

Jörg Riesmeier wrote:No, getOutputData() always returns unsigned pixel data even if the original pixel data is signed (because the output of the VOI LUT transformation is always unsigned).

I mean that when I use createWindowsDIB(), the parameter of "size" is the half of getOutPutData() when PR = 1, am I right?

#4 Post by **Jörg Riesmeier** » Sat, 2009-06-20, 11:44

There is no such general rule. The size of the output image depends on the image data and the parameters which are passed to the method(s).

kamil · #5 Post by **kamil** » Sat, 2009-06-20, 16:12

Jörg Riesmeier wrote:There is no such general rule. The size of the output image depends on the image data and the parameters which are passed to the method(s).

Because I want to display the image which PR = 1, because of the getOutPutData() return the 2's complement integer's size, so how do I set the 'size' parameter of 'CreateWindowsDIB()'? May I use the way of allcating the memory internaly?

Thank you!

Best wishes,

kamil

#6 Post by **Jörg Riesmeier** » Sat, 2009-06-20, 16:36

May I use the way of allcating the memory internaly?

Sure, just set "size" to "0" in this case (see documentation).

kamil · #7 Post by **kamil** » Tue, 2012-02-07, 09:33

Jörg Riesmeier wrote:No, getOutputData() always returns unsigned pixel data even if the original pixel data is signed (because the output of the VOI LUT transformation is always unsigned).

Hi, I want to know how to get raw data, but I find DicomImage::getInterData() return the data after modality transformation has been applied.

findAndGetUint16Array() function only get Unsigned data.

How can I get the raw unsigned data?

thank you!

J. Riesmeier · #8 Post by **J. Riesmeier** » Tue, 2012-02-07, 09:37

How can I get the raw unsigned data?

What do you mean by that? What do you intend to do?

You can either switch off the Modality LUT Transformation using the flag CIF_IgnoreModalityTransformation in the DicomImage constructor or you can use findAndGetUint8/16Array() and do the extraction and possible transformation in your own code.

kamil · #9 Post by **kamil** » Wed, 2012-02-08, 01:44

J. Riesmeier wrote:
How can I get the raw unsigned data?
What do you mean by that? What do you intend to do?

How can I get the raw signed data?

sorry, I wrote wrong.

J. Riesmeier · #10 Post by **J. Riesmeier** » Wed, 2012-02-08, 08:48

You could e.g. use getInterData() and switch off the modality transform with the above mentioned flag.

DICOM @ OFFIS

How to get data from dcm which PR = 1?

How to get data from dcm which PR = 1?

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