Diane-
  I am sorry I missed it when I first looked, but there is clearly a broken T1 scan in the sample you provided me. It looks like a Siemens Product sequence *tfl3d1_16ns. The issue is that the slice thickness is reported as varying across the volume. This seems unlikely for a 3D sequence, so it probably reflects an error in how the DICOM images were generated. However, this reflects an error in your images, not my software. Any DICOM viewing tool (e.g. Horos) will demonstrate this issue. My software does warn the user when it sees images like this, which can not be losslessly converted to a single NIfTI volume:

Warning: Interslice distance varies in this volume (incompatible with NIfTI format).
Distance from first slice:
dx=[0 2 2.99999 4 6 9 10 11 12 13 14 15 16 18 20 22 23 24 25 26 27 28 29 31 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 73 74 75 77 79 80 81 82 84 85 86 87 89 90 91 92 93 95 97 99 101 102 104 105 106 108 109 110 111 113 114 115 116 117 118 120 124 125 126 127 128 129 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 156 158 159 160 161 163 164 165 166 168 169 170 171 172 173 176 177 180 181 184 187 188 189 191 193 197 199 201 202]
Convert 154 DICOM as /Users/rorden/tst/53_1/MPRAGE_Coronal_IO (256x256x154x1)

I am afraid you will have to work with your vendor to resolve this. 

-chris