{
  "schemaVersion": 2,
  "status": "design-not-executed",
  "id": "radial-array-ecg-pep-mismatch-001",
  "seed": 4172,
  "duration_s": 180,
  "anatomy": {
    "asset": "SOMA native right hand",
    "personalized": false,
    "diameter_mm": 2.2,
    "fat_mm": 2.2,
    "registration": "atlas geometry; ultrasound normalization pending"
  },
  "array": {
    "rows": 3,
    "cols": 4,
    "pad_mm": [
      3,
      3
    ],
    "pitch_mm": 3.5,
    "middleRowStagger_mm": 1.75,
    "channelMapping": "must use measured PCB ADC order"
  },
  "acquisition": {
    "cap_Hz": 1000,
    "ecg_Hz": 1000,
    "red_Hz": 250,
    "ir_Hz": 250,
    "adcSkew_us": 0,
    "note": "zero skew is ideal simultaneous acquisition, not measured hardware"
  },
  "phases": [
    {
      "start_s": 0,
      "end_s": 60,
      "condition": "rest",
      "SBP_truth_mmHg": 120,
      "DBP_truth_mmHg": 80,
      "HR_input_bpm": 72,
      "PEP_truth_ms": 90
    },
    {
      "start_s": 60,
      "end_s": 120,
      "condition": "PEP change at fixed BP",
      "SBP_truth_mmHg": 120,
      "DBP_truth_mmHg": 80,
      "HR_input_bpm": 100,
      "PEP_truth_ms": 60
    },
    {
      "start_s": 120,
      "end_s": 180,
      "condition": "pressure change at fixed HR",
      "SBP_truth_mmHg": 140,
      "DBP_truth_mmHg": 90,
      "HR_input_bpm": 100,
      "PEP_truth_ms": 60
    }
  ],
  "estimator": {
    "input": "acquisition-frame only; never this scenario truth",
    "methods": [
      "signed-MRC",
      "loaded-MVDR",
      "proximal-distal beams"
    ],
    "calibration": "separate baseline cuff sample"
  },
  "evaluation": {
    "split": "separate forward parameters / subject / session",
    "metrics": [
      "BP bias and spread",
      "valid coverage",
      "timing bias_ms",
      "PTT CI_ms",
      "waveform distortion",
      "latency_ms"
    ],
    "clinicalClaim": false
  }
}