How to know the order of dcm images

[audi]

Hi all

I'm new to the world of DICOM. I noticed that the order of the pictures (in order to set a volume), is not by the name index. I would like to load them into memory and order them in correct way so I will have the correct volume memory. How can I know the order ?

Thanks
Audi

[Michael Onken]

Hi,

for sorting slices we do not have any functionality in DCMTK. However, for the general procedure, just search the DICOM newsgroup for slice sortingand the like.

HTH and good luck,
Michael

[Mario]

Hi,

I had the same problem yesterday: i had to load a volume stored in multiple .dcm files named like slice001-slice002-...-slice407 but, slice number was not bounded to its physical position. I solved sorting them with the DICOM tag DCM_SliceLocation.

If you need more help i can post you some code.

Bye

[audi]

Hi,
I solved sorting them with the DICOM tag DCM_SliceLocation.
If you need more help i can post you some code.
Bye

Thanks Mario, I will be glad for some code to see as reference
You can send it to audi02@walla.com

[audi]

Mario, I tried to do the follow,

Code: Select all

// get slice position
double	dValue;
VECTOR      vSlicePosition;
if (fileformat.getDataset()->findAndGetFloat64(DCM_SliceLocationVector,dValue,0).good())
{
	vSlicePosition.x  = (float)dValue;
}
if (fileformat.getDataset()->findAndGetFloat64(DCM_SliceLocationVector,dValue,1).good())
{
	vSlicePosition.y  = (float)dValue;
}
if (fileformat.getDataset()->findAndGetFloat64(DCM_SliceLocationVector,dValue,2).good())
{
	vSlicePosition.z  = (float)dValue;
}

But the function findAndGetFloat64 failed and gives nothing.

[Jörg Riesmeier]

It's easy: SliceLocationVector is of type DS (Decimal String) and findAndGetFloat64() is not applicable to this VR as you can read in the documentation. Btw, the next snapshot (and upcoming) release will contain a getFloat64Vector() method, which is also applicable to Decimal Strings.

With regard to the original question, you should have a look at this.

[Mario]

Maybe i had a differend problem but I solved using:

Code: Select all

OFString slice_location;
OFCondition status = file_format.getDataset()->findAndGetOFString( DCM_SliceLocation, slice_location );

double double_slice_location = atof( slice_location.c_str() );

I applied that to each .dcm file and then sorted them.

Bye

[Per]

Note that Slice Location is an optional tag (type 3). It will not be present in all DICOM series.

[audi]

Maybe i had a differend problem but I solved using:

Code: Select all

OFString slice_location;
OFCondition status = file_format.getDataset()->findAndGetOFString( DCM_SliceLocation, slice_location );

double double_slice_location = atof( slice_location.c_str() );

I applied that to each .dcm file and then sorted them.

Bye

Thanks! That worked for me!