Hi,
I been partially moving previously stored dicom data in J1 compression to Jpeg2000 lossless to further reduce file size.
Review of saved files show that dicom header UID tranfer syntax is Jpeg2000 lossless however the previously inserted J1 header remains intact. Is this a proper behaviour or should have the J1 header been appended or removed?
sample header
(0002,0000) UL 200 # 4 MetaElementGroupLength
(0002,0001) OB \00\01 # 2 FileMetaInformationVersion
(0002,0002) UI [1.2.840.10008.5.1.4.1.1.2] # 26 MediaStorageSOPClassUID
(0002,0003) UI [1.3.12.2.1107.5.1.4.54546.30000006042500365681200000178] # 56 MediaStorageSOPInstanceUID
(0002,0010) UI [1.2.840.10008.1.2.4.90] # 22 TransferSyntaxUID
(0002,0012) UI [1.2.826.0.1.3680043.2.135.1066.101] # 34 ImplementationClassUID
(0002,0013) SH [1.4.16/WIN32] # 12 ImplementationVersionName
(0008,0000) UL 1246 # 4 IdentifyingGroupLength
(0008,0005) CS [ISO_IR 100] # 10 SpecificCharacterSet
(0008,0008) CS [DERIVED\\SECONDARY\\AXIAL\\CT_SOM5 RTD ] # 36 ImageType
.
. header data inserted from dcmtk tools in 1.4.15x
(0008,2111) ST [Lossless JPEG compression, selection value 1, point transform 0, compression ratio 2.2878 [Lossless JPEG compression, selection value 1, point transform 0, compression ratio 1.7158] ] # 182 DerivationDescription
(0008,2112) SQ (empty) # 0 SourceImageSequence
(0008,0000) UL 92 # 4 IdentifyingGroupLength
(0008,1150) UI [1.3.12.2.1107.5.9.1] # 20 ReferencedSOPClassUID
(0008,1155) UI [1.3.12.2.1107.5.1.4.54546.30000006042500365681200000176] # 56 ReferencedSOPInstanceUID
(0008,9215) UN (empty) # 0 ?
(0008,0000) UL 90 # 4 IdentifyingGroupLength
(0008,0100) SH [121327] # 6 CodeValue
(0008,0102) SH [DCM ] # 4 CodingSchemeDesignator
(0008,0104) LO [Full fidelity image, uncompressed or lossless compressed] # 56 CodeMeaning
(0009,0000) UL 28 # 4 GroupLength
ajgg