{
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    "acs": 20,
    "mask": "randomly_cartesian",
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    ]
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  "image": {
    "size": 256,
    "dtype": "float32",
    "range": [
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      1
    ]
  },
  "seed_rule": "measurement seed = manifest['seed'] + case['seed_si'] (NOT row position)",
  "seed": 0,
  "classes": [
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      "name": "brats_t1n",
      "operator": "mri",
      "n": 100,
      "npz": "test100_brats_t1n.npz",
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}