I am also seeing a similar problem.
dwipreproc: [ERROR] Unable to determine matching reversed phase-encode direction volume for DWI volume 1.
We are processing about 100 subjects, and seeing this on about half of the subject. Maybe there is something wrong with the same bvecs are rounded (for matching?)
The below is the entire output from dwipreproc.
$ dwipreproc -eddy_options ' --repol --data_is_shelled --slm=linear --niter=5' -rpe_all -pe_dir AP dwi_denoise_degibbs.mif dwi_denoise_degibbs_eddy.mif -eddyqc_all ./eddyqc
dwipreproc:
dwipreproc: Note that this script makes use of commands / algorithms that have relevant articles for citation; INCLUDING FROM EXTERNAL SOFTWARE PACKAGES. Please consult the help page (-help option) for more information.
dwipreproc:
dwipreproc: Generated temporary directory: /home/hayashis/Downloads/dwipreproc-tmp-2XWKCY/
Command: mrconvert /home/hayashis/Downloads/dwi_denoise_degibbs.mif /home/hayashis/Downloads/dwipreproc-tmp-2XWKCY/dwi.mif
dwipreproc: Changing to temporary directory (/home/hayashis/Downloads/dwipreproc-tmp-2XWKCY/)
matching index1:0
index2:72
dwi_num_volumnes:144
grad1:[0.0, 0.0, 0.0, 0.0]
grad2:[0.0, 0.0, 0.0, 0.0]
matching index1:1
index2:72
matching index1:1
index2:73
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.9999565608, -0.00707591008, -0.006066959893, 989.999975]
matching index1:1
index2:74
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.0, 0.9999821093, -0.005981729776, 1005.000019]
matching index1:1
index2:75
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.02504331829, 0.655557579, -0.7547298145, 989.9999815]
matching index1:1
index2:76
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.5891150802, -0.7704021296, -0.2437703448, 1000.00001]
matching index1:1
index2:77
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.2359168994, -0.5314917603, -0.8135476171, 989.9999856]
matching index1:1
index2:78
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.8938854181, -0.2656021845, -0.3611431002, 989.9999023]
matching index1:1
index2:79
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.7988092416, 0.1353889127, -0.5861515486, 984.9999723]
matching index1:1
index2:80
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.2328688083, 0.9328112714, -0.2750186357, 999.9999758]
matching index1:1
index2:81
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.0, 0.0, 0.0, 0.0]
matching index1:1
index2:82
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.9369556079, 0.1467639713, -0.3171348696, 989.9999224]
matching index1:1
index2:83
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.5038913499, -0.8473682422, 0.1675128941, 999.9999959]
matching index1:1
index2:84
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.3449192932, -0.8516358114, 0.3946481039, 1000.000005]
matching index1:1
index2:85
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.4567484553, -0.6371757977, 0.6207961433, 995.0000024]
matching index1:1
index2:86
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.4876230197, -0.3965021538, -0.77782378, 985.0000654]
matching index1:1
index2:87
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.6167598838, 0.6786728363, -0.3987611153, 995.0000406]
matching index1:1
index2:88
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.5787692745, -0.111476095, 0.8078361264, 984.9999731]
matching index1:1
index2:89
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.8250462628, -0.526606335, -0.20490103, 994.999948]
matching index1:1
index2:90
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.0, 0.0, 0.0, 0.0]
matching index1:1
index2:91
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.895791564, -0.04728361023, 0.4419521854, 989.9999264]
matching index1:1
index2:92
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.2901141359, -0.5482568765, 0.7843775784, 989.9999912]
matching index1:1
index2:93
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.1150200032, -0.9645821768, 0.2373849679, 999.9999343]
matching index1:1
index2:94
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.8000754531, 0.4099099244, 0.4380104144, 990.0000451]
matching index1:1
index2:95
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.5118810034, 0.8430330316, -0.1651458324, 999.9999623]
matching index1:1
index2:96
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.7906338, 0.1597335613, 0.5910866127, 984.9998456]
matching index1:1
index2:97
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.9491868588, -0.2403454029, -0.2031708503, 995.0000057]
matching index1:1
index2:98
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.2323098361, 0.788614104, -0.5693153213, 994.9999755]
matching index1:1
index2:99
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.0, 0.0, 0.0, 0.0]
matching index1:1
index2:100
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.0199764243, -0.1942943657, 0.9807398442, 984.9999755]
matching index1:1
index2:101
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.2158380864, -0.9577605581, -0.1900227191, 1005.00003]
matching index1:1
index2:102
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.7720274608, -0.6089869488, -0.1819574013, 1000.000082]
matching index1:1
index2:103
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.1600511666, 0.3630185119, -0.9179331044, 985.0000045]
matching index1:1
index2:104
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.1465623015, 0.7371672658, 0.6596240702, 995.000089]
matching index1:1
index2:105
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.8868907819, 0.4233542444, -0.1849214015, 994.9999711]
matching index1:1
index2:106
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.5635648224, 0.238691741, 0.7908355985, 985.0000513]
matching index1:1
index2:107
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.3819320242, 0.1494071053, -0.9120336867, 984.9999791]
matching index1:1
index2:108
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.0, 0.0, 0.0, 0.0]
matching index1:1
index2:109
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.3068391819, -0.2063414547, 0.9291248143, 984.9999114]
matching index1:1
index2:110
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.3331855467, -0.136038986, -0.9329955979, 980.000041]
matching index1:1
index2:111
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.9618037623, -0.271306476, -0.03641866029, 995.0000652]
matching index1:1
index2:112
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.9596650444, 0.2115071084, -0.1852235019, 995.0000323]
matching index1:1
index2:113
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.4507181272, -0.8906774367, -0.05955563409, 1004.9999]
matching index1:1
index2:114
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.7701517354, 0.6328940996, -0.07944408814, 999.9999974]
matching index1:1
index2:115
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.7100332052, 0.4149750876, -0.568901155, 990.0000912]
matching index1:1
index2:116
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.695902611, 0.02958313109, -0.7175265809, 984.999929]
matching index1:1
index2:117
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.0, 0.0, 0.0, 0.0]
matching index1:1
index2:118
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.6814672474, 0.5352043605, 0.4991579742, 994.9999641]
matching index1:1
index2:119
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.1415655565, -0.7314580434, -0.6670294776, 995.0000668]
matching index1:1
index2:120
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.7410058748, 0.395233472, -0.5428635152, 989.9999014]
matching index1:1
index2:121
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.102484551, 0.8276202428, -0.5518529247, 995.0000604]
matching index1:1
index2:122
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.5838748698, -0.602538693, -0.5440930617, 995.0000391]
matching index1:1
index2:123
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.08727772394, -0.3418323641, -0.9356993287, 985.0000316]
matching index1:1
index2:124
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.5500507616, -0.7966462155, -0.2505972206, 999.9999052]
matching index1:1
index2:125
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.8371042842, -0.4640292058, 0.2897124669, 994.9999444]
matching index1:1
index2:126
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.0, 0.0, 0.0, 0.0]
matching index1:1
index2:127
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.3630114183, -0.5680458523, -0.7386112779, 990.000008]
matching index1:1
index2:128
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.1836361666, 0.3995099241, 0.8981478602, 989.9999143]
matching index1:1
index2:129
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.7176295254, -0.6964236223, -0.001415149956, 999.999908]
matching index1:1
index2:130
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.4329999453, 0.6878464922, 0.5825617997, 994.9999697]
matching index1:1
index2:131
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.501827032, 0.6961205197, -0.5134061277, 995.0001157]
matching index1:1
index2:132
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.1710452303, -0.5161890434, 0.8392213061, 989.9999823]
matching index1:1
index2:133
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.4636260654, 0.4303399126, -0.7745052816, 990.0000912]
matching index1:1
index2:134
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.3838653298, -0.8141389556, -0.4356893039, 994.9999836]
matching index1:1
index2:135
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.0, 0.0, 0.0, 0.0]
matching index1:1
index2:136
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.7150368331, -0.2536229066, -0.6514581711, 985.0000991]
matching index1:1
index2:137
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.2593905425, 0.8880150047, 0.3796655079, 999.9999268]
matching index1:1
index2:138
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-8.47e-05, 0.08298241603, 0.996551008, 984.9999393]
matching index1:1
index2:139
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.03643157823, -0.9059204154, -0.4218778746, 999.9999357]
matching index1:1
index2:140
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.5709425598, -0.3105253761, 0.7599990686, 990.0000726]
matching index1:1
index2:141
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[0.2829893494, 0.1518946569, 0.947019029, 985.0000241]
matching index1:1
index2:142
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.719800704, 0.6140916799, -0.323694849, 994.999854]
matching index1:1
index2:143
dwi_num_volumnes:144
grad1:[-0.9999821093, -2.050993384e-10, -0.005981729776, 1005.000019]
grad2:[-0.2656599953, 0.9609300164, 0.07770630932, 1004.999944]
dwipreproc: [ERROR] Unable to determine matching reversed phase-encode direction volume for DWI volume 1
dwipreproc: Changing back to original directory (/home/hayashis/Downloads)
dwipreproc: Contents of temporary directory kept, location: /home/hayashis/Downloads/dwipreproc-tmp-2XWKCY/