Open josephmje opened 3 years ago
I think so. The questions is basically to what order of magnitude should you be rounding the b-values. This is determined through an optional bmag
input to the round_bvals
function. If you do not specify that, this order of magnitude is determined by the value of the largest b-value, to be order of magnitude smaller than that of the maximal value. So, in this case, it automatically rounds into the nearest 100's. We could give users extra controls, by exposing this keyword argument through our API.
It seems like there are 2 places where the bvals are getting rescaled: 1 and 2
I was looking at how MRtrix3 handles this and they scale by the squared amplitude of the gradient vectors
I ran into this issue again when working with the NTU-DSI-122 dataset. The round_bvals
function artificially introduces b0s into the dataset. Below is what MRtrix3 outputs vs DiffusionGradientTable:
MRtrix3
0 0 0 0
-0.9899531957603029 0.005809392215236331 -0.141276045974019 23.69176963999999
-0.006502908410694216 -0.9999646796184842 0.005324631227082544 23.70627335999999
0.1410910353363024 -0.006607010764052516 -0.9899745790455904 23.69922632
-0.1407945428760187 0.00625032986577012 0.9900191059130637 23.67952356000002
0.006860320422247859 0.9999602581574732 -0.005693690309796706 23.68945347999999
0.9900094119725403 -0.006166866655823903 0.1408663691639498 23.70607623999998
-0.7045540089015556 -0.7031449846408822 -0.09586855123094538 94.63130459999998
-0.6001289237969868 -0.0005646504771176 -0.7999030916255475 94.64211015000005
-0.7996815774092526 0.008759225039016638 0.6003604340135726 94.57770119999999
-0.6952306934237482 0.7112326081846938 -0.1039348833468926 94.59178469999996
0.09513700199524415 -0.7117946055596297 -0.6959147866999006 94.66587375000003
-0.1043794235335665 -0.7026097143670808 0.7038782033987196 94.61751630000005
0.1046273090687004 0.7023341984240934 -0.7041163255606483 94.62329115000003
-0.09492256010233978 0.7118148396036609 0.6959233734425307 94.59294089999997
0.6952535017302935 -0.7112531678920744 0.1036412055856805 94.65391814999997
0.7996456549792608 -0.009010127363994088 -0.6004045670026783 94.64561564999997
0.6004142069813299 0.000310617935881372 0.7996891168269572 94.63131690000002
0.7048237809209271 0.7029095809977064 0.09561149925588244 94.62628004999992
-0.493809498332005 -0.5777528760218104 -0.6498875238113285 213.01434271
-0.6567618534198728 -0.5703284057907044 0.4933450896084069 213.0151272599999
-0.4861878538895903 0.5768854414110277 -0.6563722710613529 212.9470006300001
-0.6491074074800444 0.5845102005647062 0.4868340569335127 212.96463916
0.6490803459881754 -0.584508681060358 -0.4868719608038146 213.1169618499999
0.4863538361429843 -0.5770465955993693 0.6561075922256814 212.9811977800001
0.6568874031501775 0.5700520054254746 -0.4934973664499241 213.0666583499999
0.4940917381045879 0.5776357224313291 0.6497771360305191 212.94774826
-0.9899785880381897 0.005794062414228898 -0.1410986324053229 378.7514825899997
-0.00668158292718224 -0.9999625022749526 0.005509128207131228 378.8580133299998
0.1410910353363024 -0.006607010764052516 -0.9899745790455904 378.8798389600001
-0.140942823755781 0.006428707571396775 0.9899968647176152 378.7223078900003
0.006860320422247859 0.9999602581574732 -0.005693690309796706 378.7236004399999
0.9900066998982968 -0.005972831099460889 0.1408937878160044 378.8658301799998
-0.8884309004261718 -0.4420410454093279 -0.1236537477853798 591.4315788199997
-0.8223376853574679 0.002227073738432438 -0.5689954054150929 591.5360090199998
-0.9485558590624227 0.008138254289808971 0.3165052148945788 591.3164133799996
-0.8824709581135973 0.4524002319696442 -0.1287596140095248 591.4100621999996
-0.4486547759013213 -0.8918155694771829 -0.05808512803655598 591.66935362
-0.3165053592573777 -0.003326032088558235 -0.948584890809412 591.5686607600003
-0.568868238191698 0.008349094632621139 0.8223862962109041 591.33580756
-0.4366329090312537 0.8970448619936776 -0.06828043879215234 591.3946052999997
0.05710964645604326 -0.8973340983424405 -0.4376414105562053 591.71424784
-0.06892055970921297 -0.8915171562323196 0.4477132079722535 591.5923459599999
0.1231332314170047 -0.4530313796439907 -0.8829500418362688 591.6634477000003
-0.1291220352910538 -0.4414154913016568 0.8879638866762616 591.5484822000003
0.1292684993217259 0.4412127024240272 -0.8880433583461992 591.6613560200001
-0.1230036383974283 0.4529781870019794 0.8829953946886668 591.3826858
0.0690834101640624 0.8914088529116291 -0.4479037166522264 591.5228129799997
-0.05696369370430737 0.8973754047988891 0.4375757311158741 591.4479123800002
0.4367033714557719 -0.8970240922409807 0.06810244708089999 591.6339334799997
0.5688980603518858 -0.008507891104895858 -0.822364039046461 591.60401938
0.316697719442156 0.003165673538300151 0.9485212348762606 591.4432676200004
0.4488501643784535 0.891727618627997 0.05792567749691497 591.5728441199999
0.882460575140504 -0.4524741927965215 0.1285707516343706 591.6368710599996
0.9485212254543728 -0.008297290316853355 -0.3166048638854632 591.5576486799996
0.8224655944965047 -0.002387682577986434 0.5688098494588663 591.5804418399998
0.8885454764525162 0.4418583349005428 0.1234833922221551 591.4904688399998
-0.7533834826133998 -0.4062106252124091 -0.517113388039653 851.9036544199998
-0.8686361430677322 -0.4008207916553304 0.2912283364187087 851.8252917199991
-0.7479435981593581 0.4102720606408222 -0.5217827231999602 851.8689311599999
-0.863179838650881 0.4156906413791559 0.2865691135074139 851.8271192599993
-0.3519473045253541 -0.8167765161927547 -0.4571752589908646 852.2581971799998
-0.4670587342569737 -0.8114958647902543 0.3511845671190453 852.0466640399994
-0.2917227184055466 -0.4112244174766262 -0.8635926898932665 852.0802797000005
-0.5220486664500021 -0.4006130767426127 0.7529769934072301 851.88966174
-0.28627273647741 0.405171762856365 -0.868264800008385 852.0530142800003
-0.516600790026178 0.4160297924607157 0.7483600974994743 851.8250886599999
-0.3411110303320227 0.8161406186474721 -0.46643086902514 851.8933537400001
-0.4561956325431975 0.8215671869639007 0.3419252873841518 851.8280791799999
0.4562320574314936 -0.8215184341347409 -0.3419938188748878 852.2334792399998
0.3412221195574559 -0.8162062793233974 0.4662346777297602 852.0625396400001
0.5166175864847988 -0.4160732704769194 -0.7483243300396305 852.24784112
0.2864260496132027 -0.4053302795987155 0.8681402435916687 852.0033015000004
0.5221258643694325 0.4004143957354313 -0.7530291451493111 852.1108310000003
0.2919107154615287 0.4111383498263035 0.8635701427798685 851.8290206400003
0.467203069576093 0.8113480910497152 -0.3513339820294353 852.0489346199996
0.3521405863409586 0.8167419643203911 0.4570881437638862 852.0242166799998
0.8631270804454189 -0.4157421101508428 -0.2866533461327322 852.2174559599995
0.7480209233495438 -0.4103816554874255 0.5215856545867569 852.02301678
0.8686848615611676 0.4006296865075726 -0.2913459551517732 852.0140821399992
0.7535494435145621 0.406075231868157 0.5169778933785432 851.8561937599998
-0.7046889102329872 -0.7030273014536346 -0.09574002927441276 1515.291546979999
-0.600195794664835 -0.0005755931077146655 -0.7998529094522452 1515.215175740001
-0.7997312580113511 0.008769821541340104 0.6002940989129535 1514.76522062
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0.09503157912174616 -0.7117359783189992 -0.6959891494383547 1515.54776732
-0.1043766151664705 -0.7024828448187593 0.7040052378652685 1515.15965764
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0.600338454002406 0.0004485686333996093 0.7997459217977809 1515.12873492
0.7048237809209271 0.7029095809977064 0.09561149925588244 1515.251391759999
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0.08388264772335099 0.8283064956418115 -0.5539603331363195 4000.04
-0.07256254734585145 0.8356772402753291 0.5444063067310031 3999.654
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0.6664682303220866 -0.008711116452934969 -0.7454825379722112 4000.86668
0.4318468174447974 0.002193280933706632 0.9019442974937786 3999.547880000002
0.5547462521193397 0.8287736164372909 0.07342266991195694 3999.972159999998
0.8200058303557354 -0.5595267738875824 0.1204999065790308 4000.739359999998
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0.7455280107963963 -0.001250795895002524 0.6664731207090031 3999.916560000001
0.8274997059968422 0.549733230412031 0.1141823627181212 3999.937599999997
DiffusionGradientTable
0.0 0.0 0.0 0.0
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-0.006408110577589846 -0.9999712593904923 0.004051729484837986 0.0
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0.0067651627013240396 0.9999673681277524 -0.0044153429403288496 0.0
0.9901407189031045 -0.006087194064674898 0.1399439274797677 0.0
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-0.6056875149438168 -0.001476615882230732 -0.7957012340361929 100.0
-0.803827375428434 0.0096037313249807 0.5947851030888995 100.0
-0.6954704053638414 0.7112228648980631 -0.10238628672456915 100.0
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0.6715094355097525 -0.009744226315673725 -0.7409319321468621 4000.0
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0.9044899260128851 -0.00920723167541776 -0.4263955917057312 4000.0
0.7500263305374764 -0.0005251356899835024 0.6614077620749512 4000.0
0.8275049988111247 0.5497391720592623 0.11411537865773048 4000.0
I don't know as much about diffusion gradient scheme handling. But I was wondering whether we should even be rounding at all? If not, we could use clustering to assign b-values to shells (unique_bvals_tolerance
).
array([ 0, 23, 94, 213, 378, 591, 852, 1515, 1917, 2367, 2864,
3408, 4000], dtype=uint16)
Or by default, only round to the nearest 10?
EDIT: Both of these solutions would fail in the HCP dataset I described earlier.
Should this be the intended behaviour?