how to find the DTI information from DICOM image file

DTI information is not the standard information in MRI dicom file, so different company store them maybe in different place(under different tag value).Here is the DTI information from GE and siemens scanner.
DTI information include B-value, 3 gradient value of each direction. But these information is not the standard information for DICOM file, so different company store these information in differendt parts.
For GE data
(0x0043,0x1039) b value
(0x0019,0x10bb) x direction gradient value
(0x0019,0x10bc) y direction gradient value
(0x0019,0x10bd) z direction gradient value
For Siemens data
(0x0019,0x100c) b value
(0x0019,0x100e) gradient value