==University of Michigan==

Contributed by Tom Chenevert and Dariya Malyarenko

===SIEMENS MRI===
The software version at least B15V (0018; 1020), follow tag value would be useful --> (PRIVATE TAGS)

 * 0019; 100A; Number Of Images In Mosaic
 * 0019; 100B; Slice Measurement Duration
 * 0019; 100C; B_value
 * 0019; 100D; Diffusion Directionality
 * 0019; 100E; Diffusion Gradient Direction
 * 0019; 100F; Gradient Mode
 * 0019; 1027; B_matrix
 * 0019; 1028; Bandwidth Per Pixel Phase Encode
 
===GE MRI===
Software version 12.0 (0018; 1020) ---> (PRIVATE TAGS)
 * 0043; 1039; first string is b value
 * 0043; 1030; ** for LAB-DWI only: 3-R/L; 4-A/P; 5-S/I (Tr: 14-b=0; 15-b>0)
 * 0019; 10BB; x gradient; (for non-Lab DWI)
 * 0019; 10BC; y gradient;
 * 0019; 10BD; z gradient;
 
===Philips MRI===
Software version 3.2.1 (0018; 1020)---> PUBLIC TAGS - C1-conditional

 * 0018; 9087; b value
 * 0018; 9089; Diffusion direction

===Comments===

Also as discussed, interpretation of what’s in these tags varies with scanner sw version, or the path the images took in getting to us.  In GE, for example, we’ve  occasionally seen stored_bvalue  = true_bvalue + 1e9.   For Siemens, sometimes tag [0019; 100C ] requires conversion from unit8 to character string, then to number.  As such, we’ve had to build in logic to deal with this these conditions.  (Now my disclaimer …)
 
===Disclaimer===

Neither TL Chenevert, D Malyarenko, nor the University of Michigan shall be held liable for any improper or incorrect use of the information described and/or contained herein and assumes no responsibility for anyone's use of the information.  Although the information is believed to be reliable, no warranty expressed or implied is made regarding accuracy, adequacy, completeness, legality, reliability or usefulness of any information. This disclaimer applies to both isolated and aggregate uses of the information.
Dasha and I are not clear on best way to share notes (Fred, was it you that mentioned accessible “information base”?), thus the limited email list here.  Of course best result is to get all this in public tags.  Other insights from the group welcome.