Method of recognizing b value from DICOM tag in DWI image

DWI Sequence images contain high and low b It's worth it DICOM Images , It is often necessary to b value DICOM The images are separated for subsequent calculation .

In general DWI Images DICOM TAG Inside b Values are read according to the following rules ：https://www.na-mic.org/wiki/NAMIC_Wiki:DTI:DICOM_for_DWI_and_DTI

That is, according to the machine manufacturer ：

Philips: b_value (0018,9087) ----- 0  1000  （ This is also DICOM The standard recommends tag）

SIEMENS:  b_value (0019,100C) ----- 0  1000

GE:  b_value (0043,1039) ----- 0\8\0\0（ Express b value=0）  1000\8\0\0 （ Express b value=1000）

but GE Sometimes, this happens to our machines （ from radiant Read the dicom tag）：

The said 0\8\0\0 That is to say b value=0

 

The said 1000\8\0\0  That is to say b value=1000

But in python with simpleITK Can be read correctly as   0\8\0\0  or  1000\8\0\0

reader = sitk.ImageFileReader()
reader.SetFileName(dwi_file_path)
reader.LoadPrivateTagsOn()
reader.ReadImageInformation()
b_value = reader.GetMetaData('0043|1039')
print(b_value)