============================================================
  VALIDATION REPORT - Algorithmic lung segmentation
  Master 2 Memoir - Digital Lung Twins
============================================================

  Method   : HU threshold (-400 HU) + morphology + flood-fill
  Dataset  : Yousra0x0/validation_20
  Patients : 20
  Valid    : 20
  Failing  : 8 (Dice < 0.95)
  Date     : 2026-05-05 12:43

  HYPERPARAMETERS
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  HU_THRESHOLD          = -400
  DISK_CLOSING_RADIUS   = 3
  DISK_CLOSING_TOUCHING = 5
  SEAM_HEAL_RADIUS      = 2
  MIN_BLOB_VOXELS       = 50
  MAX_LUNG_REGIONS      = 3
  CLOSING_RADIUS        = 3

  GLOBAL METRICS
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  dice           : mean=0.9501  std=0.0317  min=0.8794  max=0.9833  CI95=[0.9358, 0.9644]  n=20
  iou            : mean=0.9067  std=0.0564  min=0.7847  max=0.9672  CI95=[0.8813, 0.9320]  n=20
  f1             : mean=0.9501  std=0.0317  min=0.8794  max=0.9833  CI95=[0.9358, 0.9644]  n=20
  precision      : mean=0.9695  std=0.0061  min=0.9493  max=0.9787  CI95=[0.9667, 0.9722]  n=20
  recall         : mean=0.9332  std=0.0573  min=0.8056  max=0.9937  CI95=[0.9074, 0.9589]  n=20
  sensitivity    : mean=0.9332  std=0.0573  min=0.8056  max=0.9937  CI95=[0.9074, 0.9589]  n=20
  specificity    : mean=0.9966  std=0.0012  min=0.9941  max=0.9981  CI95=[0.9961, 0.9971]  n=20
  hd95           : mean=9.5158  std=5.3898  min=2.0000  max=20.4939  CI95=[7.0923, 11.9393]  n=20
  vol_error      : mean=0.0491  std=0.0474  min=0.0011  max=0.1678  CI95=[0.0278, 0.0704]  n=20

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  FAILURE CASE REPORT
  Total failing cases: 9
  Dice threshold: 0.95
============================================================
  radiopaedia_40_86625_0                              Dice=0.8794  HD95=14.0  VolErr=0.1678
  radiopaedia_7_85703_0                               Dice=0.8980  HD95=12.8  VolErr=0.1024
  radiopaedia_4_85506_1                               Dice=0.9032  HD95=8.0  VolErr=0.1222
  coronacases_003                                     Dice=0.9090  HD95=20.5  VolErr=0.1133
  radiopaedia_29_86490_1                              Dice=0.9250  HD95=4.9  VolErr=0.0914
  radiopaedia_10_85902_1                              Dice=0.9320  HD95=4.5  VolErr=0.0706
  radiopaedia_27_86410_0                              Dice=0.9350  HD95=9.1  VolErr=0.0704
  radiopaedia_14_85914_0                              Dice=0.9422  HD95=17.3  VolErr=0.0663
  coronacases_010                                     Dice=0.9499  HD95=16.0  VolErr=0.0369