{
  "schema": "medimageosworld-public-task-v1",
  "task_id": "L4_4ch",
  "modality": "MR",
  "level": "L3",
  "goal_text": "A two-chamber localizer has been acquired. Accurately prescribe the initial four-chamber long-axis localizer; its row is open.\n\nANATOMICAL CRITERIA:\nBoth ventricles and both atria should be represented in one long-axis plane without foreshortening the LV apex. The LV apex and midpoint of the LV–LA junction should be in plane. Where available, basal ventricular SAX anatomy should support a four-chamber orientation across the interventricular septum toward the RV free wall, rather than an oblique two-chamber or outflow-tract view. The plane should be approximately perpendicular to the SAX planes and consistent with any acquired long-axis references.\nThese XCAT reference images are diastolic; valve leaflets may not be visible. Use the midpoint of the LV–LA junction and the LV apex to define the LV long axis. A short-axis plane is perpendicular to that long axis.\n\nENDPOINT: The requested prescription has been successfully submitted. Return done at that point; later workline rows are outside this task. Completion of later acquisitions is not required.",
  "budgets": {
    "max_steps": 60,
    "wall_budget_s": 3600.0
  },
  "observation": {
    "mode": "pixels_only",
    "viewport_px": [
      1600,
      1000
    ],
    "notes": "Screenshot of the console each step plus one history image and a compact text history of the last four actions; the full text operator manual; geometry tasks also get reference images of a correctly planned view from a different phantom. The model may request zoomed crops of the current screenshot."
  },
  "allowed_actions": [
    "click",
    "double_click",
    "drag",
    "move",
    "scroll",
    "key",
    "type",
    "wait",
    "done",
    "abstain"
  ],
  "initial_setup": "The two-chamber localizer has been acquired; the 4-Chamber Localizer row is open in the editor. Any editable draft prescription starts from a per-episode randomised position and orientation.",
  "visualization": {
    "start_png": false,
    "success_png": false,
    "success_gif": false,
    "note": "visualization pending: this start state is built from upstream acquisitions whose geometry comes from private reference planning that does not exist for the public development phantom",
    "status": "visualization pending"
  }
}