{
  "schemaVersion": "2.0.0",
  "identity": {
    "slug": "hitachi-etg-4000",
    "manufacturerSlug": "hitachi",
    "name": {
      "value": "ETG-4000",
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "modelNumber": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "codename": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "aliases": {
      "value": [
        "Hitachi ETG-4000",
        "Hitachi Optical Topography ETG-4000"
      ],
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "generation": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "predecessorSlug": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "successorSlug": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "tagline": {
      "status": "unknown",
      "sources": [
        {
          "label": "editorial copy — not a sourced fact"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "shortDescription": {
      "status": "unknown",
      "sources": [
        {
          "label": "editorial prose — not a sourced fact"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "longDescription": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "countryOfOrigin": {
      "value": "JP",
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "releaseDate": {
      "status": "unknown",
      "sources": [
        {
          "label": "v0 said 2002; not pinned in primary Hitachi sources"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "announcedDate": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "discontinuedDate": {
      "status": "unknown",
      "sources": [
        {
          "label": "v0 said 2018; not pinned in primary Hitachi sources"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "status": {
      "value": "discontinued",
      "status": "verified",
      "sources": [
        {
          "url": "https://www.alivelearn.net/?p=2752",
          "label": "Xu Cui — list of fNIRS manufacturers"
        }
      ],
      "updatedAt": "2026-05-04"
    }
  },
  "classification": {
    "invasiveness": {
      "value": "non-invasive",
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "modalities": {
      "value": [
        "fNIRS"
      ],
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "primaryModality": {
      "value": "fNIRS",
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "direction": {
      "value": "read",
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "category": {
      "value": [
        "clinical-grade",
        "research-grade",
        "diagnostic"
      ],
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        },
        {
          "url": "https://en.wikipedia.org/wiki/Functional_near-infrared_spectroscopy",
          "label": "Wikipedia — fNIRS (mentions Hitachi ETG-4000)"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "formFactor": {
      "value": [
        "scalp-cap",
        "tabletop"
      ],
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "intendedUseCases": {
      "value": [
        "psychiatric and developmental fNIRS research",
        "depression / schizophrenia screening (Japan)"
      ],
      "status": "verified",
      "sources": [
        {
          "url": "https://en.wikipedia.org/wiki/Functional_near-infrared_spectroscopy",
          "label": "Wikipedia — fNIRS (mentions Hitachi ETG-4000)"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "targetUsers": {
      "value": [
        "clinician",
        "psychiatrist",
        "neuroscience-researcher"
      ],
      "status": "verified",
      "sources": [
        {
          "url": "https://en.wikipedia.org/wiki/Functional_near-infrared_spectroscopy",
          "label": "Wikipedia — fNIRS (mentions Hitachi ETG-4000)"
        }
      ],
      "updatedAt": "2026-05-04"
    }
  },
  "electrodes": {
    "totalChannels": {
      "status": "unknown",
      "sources": [
        {
          "label": "Configurable; v0 said 52 — Hitachi configs include 3×11 and 4×4 arrays"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "recordingChannels": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "referenceChannels": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "electrodeType": {
      "value": [
        "optode"
      ],
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "material": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "positions1020": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "channels": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "requiresGel": {
      "value": false,
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "requiresSaline": {
      "value": false,
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "prepTimeMinutes": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "reusable": {
      "value": true,
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "disposable": {
      "value": false,
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    }
  },
  "acquisition": {
    "samplingRateHz": {
      "value": {
        "typical": 10
      },
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "resolutionBits": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "notchFiltersHz": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "onboardArtifactRejection": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    }
  },
  "stimulation": {
    "capable": {
      "value": false,
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    }
  },
  "connectivity": {
    "protocols": {
      "value": [
        "ethernet"
      ],
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "bluetoothVersion": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "bluetoothProfiles": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "concurrentMode": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "encryptionInTransit": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "pairingMethods": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "cloudSync": {
      "value": false,
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "offlineRecording": {
      "value": true,
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    }
  },
  "power": {
    "sources": {
      "value": [
        "wired-mains"
      ],
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "batteryLifeActiveHours": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "chargingPort": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "chargingTimeMinutes": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "batteryReplaceable": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "notes": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    }
  },
  "physical": {
    "weightGrams": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "dimensions": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "materials": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "sizes": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "headCircumferenceCm": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "operatingTempC": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    }
  },
  "software": {
    "apps": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "mobileApp": {
      "value": false,
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "cloudPlatform": {
      "value": false,
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "offlineMode": {
      "value": true,
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "subscriptionRequired": {
      "value": false,
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "rawDataAccess": {
      "value": true,
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "exportFormats": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "lslSupport": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "dataOwnership": {
      "value": "user",
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "privacyPolicyUrl": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    }
  },
  "sdk": {
    "hasSdk": {
      "value": false,
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "docsUrl": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "openSource": {
      "value": false,
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "languages": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "webBluetooth": {
      "value": false,
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "rawSampleAccess": {
      "value": true,
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "bciParadigms": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "thirdPartyIntegrations": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    }
  },
  "regulatory": {
    "fdaStatus": {
      "value": "none",
      "status": "verified",
      "sources": [
        {
          "url": "https://www.nitrc.org/projects/hitachimedical/",
          "label": "NITRC — Hitachi Optical Topography System listing"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "ceMark": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "certifications": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "prescriptionRequired": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "pediatricApproved": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    }
  },
  "pricing": {
    "msrp": {
      "status": "unknown",
      "sources": [
        {
          "label": "Capital equipment — v0 said ~USD 300k at launch; not pinned in primary Hitachi sources"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "currentPrice": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "subscription": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "buyUrls": {
      "status": "unknown",
      "sources": [
        {
          "label": "Discontinued; no active vendor URL"
        }
      ],
      "updatedAt": "2026-05-04"
    },
    "warranty": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    },
    "returnPolicyDays": {
      "status": "unknown",
      "updatedAt": "2026-05-04"
    }
  },
  "editorial": {
    "pros": [
      "Foundation of Japanese clinical fNIRS literature",
      "Multi-channel CW fNIRS"
    ],
    "cons": [
      "Discontinued — no new sales",
      "Tabletop wired unit"
    ],
    "bestFor": [],
    "notFor": [],
    "comparableDevices": [
      "nirx-nirscout",
      "shimadzu-lightnirs"
    ]
  },
  "provenance": {
    "sources": [
      {
        "label": "NITRC — Hitachi Optical Topography listing",
        "url": "https://www.nitrc.org/projects/hitachimedical/"
      },
      {
        "label": "Wikipedia — fNIRS overview",
        "url": "https://en.wikipedia.org/wiki/Functional_near-infrared_spectroscopy"
      },
      {
        "label": "Xu Cui — list of fNIRS manufacturers",
        "url": "https://www.alivelearn.net/?p=2752"
      }
    ],
    "lastReviewedAt": "2026-05-07"
  }
}