GDCM: ReWriteSCAsMR.py

GDCM 3.2.11

ReWriteSCAsMR.py
"""
GDCM 1.x would write out MR Image Storage as Secondary Capture Object while still setting Rescale Slope/Intercept
and saving the Pixel Spacing in (0028,0030)
"""
import gdcm
import sys,os
def CheckSecondaryCaptureObjectIsMRImageStorage(r):
ds = r.GetFile().GetDataSet()
# Check Source Image Sequence
if ds.FindDataElement( gdcm.Tag(0x0008,0x2112) ):
sis = ds.GetDataElement( gdcm.Tag(0x0008,0x2112) )
sqsis = sis.GetSequenceOfItems()
if sqsis.GetNumberOfItems():
item1 = sqsis.GetItem(1)
nestedds = item1.GetNestedDataSet()
if nestedds.FindDataElement( gdcm.Tag(0x0008,0x1150) ):
ReferencedSOPClassUID = nestedds.GetDataElement( gdcm.Tag(0x0008,0x1150) )
raw = ReferencedSOPClassUID.GetByteValue().GetPointer()
uids = gdcm.UIDs()
# what is the actual object we are looking at ?
ms = gdcm.MediaStorage()
ms.SetFromDataSet(ds)
msuid = ms.GetString()
uids.SetFromUID( msuid )
msuidname = uids.GetName() # real Media Storage Name
uids.SetFromUID( raw )
sqmsuidname = uids.GetName() # Source Image Sequence Media Storage Name
# If object is SC and Source derivation is MRImageStorage then we can assume 'Pixel Spacing' is correct
if( sqmsuidname == 'MR Image Storage' and msuidname == 'Secondary Capture Image Storage' ):
return True
# in all other case simply return the currentspacing:
return False
if __name__ == "__main__":
r = gdcm.ImageReader()
filename = sys.argv[1]
r.SetFileName( filename )
if not r.Read():
sys.exit(1)
f = r.GetFile()
if( CheckSecondaryCaptureObjectIsMRImageStorage(r) ):
# Special handling of the spacing:
# GDCM 1.2.0 would not rewrite correctly DICOM Object and would always set them as 'Secondary Capture Image Storage'
# while we would rather have 'MR Image Storage'
gdcm.ImageHelper.SetForcePixelSpacing( True )
mrspacing = gdcm.ImageHelper.GetSpacingValue( r.GetFile() )
# TODO: I cannot do simply the following:
#image.SetSpacing( mrspacing )
image.SetSpacing(0, mrspacing[0] )
image.SetSpacing(1, mrspacing[1] )
image.SetSpacing(2, mrspacing[2] )
gdcm.ImageHelper.SetForceRescaleInterceptSlope( True )
ris = gdcm.ImageHelper.GetRescaleInterceptSlopeValue( r.GetFile() )
image.SetIntercept( ris[0] )
image.SetSlope( ris[1] )
outfilename = sys.argv[2]
w = gdcm.ImageWriter()
w.SetFileName( outfilename )
w.SetFile( r.GetFile() )
w.SetImage( image )
if not w.Write():
sys.exit(1)
sys.exit(0)
gdcm::ImageHelper::GetRescaleInterceptSlopeValue
static std::vector< double > GetRescaleInterceptSlopeValue(File const &f)
gdcm::ImageHelper::SetForcePixelSpacing
static void SetForcePixelSpacing(bool)
gdcm::ImageHelper::GetSpacingValue
static std::vector< double > GetSpacingValue(File const &f)
Set/Get Spacing from/to a File.
gdcm::ImageHelper::SetForceRescaleInterceptSlope
static void SetForceRescaleInterceptSlope(bool)
gdcm::ImageReader
ImageReader.
Definition gdcmImageReader.h:34
gdcm::ImageWriter
ImageWriter.
Definition gdcmImageWriter.h:33
gdcm::MediaStorage
MediaStorage.
Definition gdcmMediaStorage.h:44
gdcm::Tag
Class to represent a DICOM Data Element (Attribute) Tag (Group, Element).
Definition gdcmTag.h:39
gdcm::UIDs
all known uids
Definition gdcmUIDs.h:31