[Insight-users] DICOM series

[Miller, James V (Research)]

Uday, 

Do you know what DICOM tag distinguishes the time instants? We can add
the ability to the DICOM code to group based on time.

I have seen the second issue before. Can you check the Instance 
UIDs (0x0008, 0x0018) for each of the images in the new folder?  

You can use DICOMWorks (free download) to look at the DICOM tags.  
I have seen secondary captures use the same Instance UID for each image 
(say 0.0.0.0).  The UIDs are supposed to be unique on an image to 
image basis.  The DICOM code in ITK uses the  UID's as keys in several 
maps.  If the UIDs are not unique, the a single file gets read for each 
slice in the volume. The short term fix is to fix the UIDs in the DICOM
files.  DICOMWorks allows you to do this as well.

Check the DICOM tags (0x0008, 0x0018) to see if the field is unique across
all your images.

Jim



-----Original Message-----
From: Uday Kurkure [mailto:udaykurkure at yahoo.com]
Sent: Wednesday, October 20, 2004 6:26 PM
To: insight-users at itk.org
Subject: [Insight-users] DICOM series




Hello all,

I have been playing with ITK DICOM series image
read/write and MRIconvert to write a volume image in
.raw format. The findings and problems:

1. In a single series there are slices of volumes
acquired at different time instants. And
unfortunately, the acquisition time label in the
headers is same for all. So, sorting by slice location
doesn't work properly as there are more than one
slices at the same position (of different time
instants). Is there any other way to sort the slices
in a volume and also sort the volumes?
(These are original primary capture images)

2. I myself sorted the images for one volume (acquired
at one time instant)and saved them in a separate
folder with naming convention: 
msPP_VV_SS.dcm, where PP is subject number, VV is
volume number and SS is the slice number in that
volume. But now also if I run the code, it reads a
single slice 'ms01_01_05.dcm' 11 times (there are 11
slices in the folder). How to fix this? (Since this is
secondary write of DICOM images, Image Number info is
lost, but rest all (like slice location, patient
position/orientation etc) are there in the header.

Thanks,

-Uday






		
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