Domain: Healthcare — Imaging Medicine
Target concept: CT findings of splenic rupture

Video generation prompt: Perform a non-contrast CT scan of the abdomen for patients with splenic rupture, and evaluate the morphology, density of the spleen, and the condition of the abdominal cavity.

Evaluation guide:
(i) Target concept: Accurate visual representation of a non-contrast abdominal CT scan showing the classic findings of splenic rupture.
Minimum mechanism: The axial CT image must reflect real X-ray attenuation physics (grayscale only, no artificial coloring), correct anatomical positioning (spleen in the left upper quadrant), and the diagnostic hallmarks of splenic rupture: a visible break or discontinuity in the splenic contour/capsule, a patch of parenchyma that looks a different shade from the rest of the spleen (representing a laceration or hematoma), and a rim or pool of fluid-density material around the spleen and/or elsewhere in the abdominal cavity (representing perisplenic or intraperitoneal blood).
(ii)Storyline: Frame 1–3: Stable axial abdominal view enters the field of view with the diaphragm dome visible; Frame 4–7: Smooth scroll or zoom isolates the spleen in the left upper quadrant, keeping orientation and lighting consistent; Frame 8–10: Static close-up of the spleen showing the disrupted contour, the differently-shaded lacerated/hematoma patch, and the surrounding fluid collection: no motion, no occlusion, no annotation overlays. Perspective is fixed frontal axial; all structures stay fully visible and anatomically anchored without cutaways or cuts.

Manual:
Experimental Procedure
1. Position patient supine on CT table.
2. Acquire axial non-contrast CT images of the abdomen from diaphragm to iliac crests.
3. Scroll through the series to locate the spleen in the left upper quadrant.
Observation of Experimental Phenomena
- The spleen's contour shows a visible break or irregular disruption rather than a smooth edge.
- A patch of the spleen's parenchyma appears a different (typically darker or more heterogeneous) shade than the rest of the spleen, consistent with a laceration or hematoma.
- Fluid-density material is visible tracking around the spleen (perisplenic) and/or elsewhere in the abdominal cavity, consistent with hemoperitoneum.
Summary of Experimental Principles
Non-contrast CT depicts tissue by intrinsic X-ray attenuation: normal splenic parenchyma is homogeneous soft-tissue density (roughly 40-60 HU) with a smooth capsule; splenic rupture disrupts the capsule/parenchyma and releases blood into the perisplenic and peritoneal space, both visible on non-contrast CT as, respectively, a contour break/density irregularity in the spleen and a fluid-density collection nearby.

Prompt Grounding rubric:
level_1: No abdominal CT scene is shown; no spleen is visible; no axial cross-sectional view appears; or there's no indication this is a non-contrast scan.
level_2: A static abdominal image appears but isn't in axial orientation, or the spleen is missing or mislabeled as a different organ, or the video shows no attempt to depict the spleen's contour, internal density, or the surrounding abdominal cavity.
level_3: An axial non-contrast CT view of the abdomen shows a clearly identifiable spleen; the video shows some depiction of the spleen's contour, its internal density pattern, and the state of the surrounding abdominal cavity, though one of these three may be ambiguous, hard to see, or only partially shown.
level_4: An axial non-contrast CT view shows a correctly positioned, correctly labeled spleen in the left upper quadrant; all three elements are clearly visible: (a) the spleen's contour shows a visible break or irregularity rather than a perfectly smooth edge, (b) a distinctly different-shaded patch is visible within the spleen's parenchyma, (c) a fluid collection is visible around the spleen and/or elsewhere in the abdominal cavity; there is no mislabeling, no phantom organs, and no anatomically impossible layout.
level_5: Everything required for score 4 is shown, with correct anatomical orientation (head-up, correct left/right sides); the spleen sits centrally in the left upper quadrant with its contour break, internal density irregularity, and surrounding fluid collection all simultaneously visible and unobstructed by any label, arrow, or UI element; nothing in the frame contradicts standard non-contrast abdominal CT presentation.

Scientific and Causal Correctness rubric:
level_1: The image contradicts basic CT physics or anatomy: the spleen is shown in an unnatural color, appears translucent or pulsating, or the free fluid is shown bright white as if contrast had been injected into a non-contrast scan.
level_2: At least two of the following are wrong at once: the spleen's density pattern doesn't look like real tissue, the fluid collection is shown unrealistically bright (contrast-like) instead of a plausible fluid shade, and the spleen's contour break looks like an anatomically impossible shape (e.g., the spleen split into two floating pieces).
level_3: One element is off: for example, the spleen's contour break is present but drawn as an impossibly sharp geometric cut rather than an organic-looking laceration, or the perisplenic fluid is shown unrealistically bright/white rather than a plausible fluid-like gray, while the other elements (spleen position, general density pattern) remain anatomically plausible.
level_4: All visible findings match what non-contrast CT can actually show: the spleen's contour break and internal density patch look like plausible tissue disruption rather than an artificial shape; the perisplenic/intraperitoneal fluid is shown as a gray, fluid-like density rather than bright white; nothing implies contrast was injected; no unrelated pathology (e.g., a mass, a cyst) is substituted for the rupture findings.
level_5: Every visible finding is consistent with real splenic rupture on non-contrast CT: the contour disruption looks like a genuine laceration line rather than a stylized crack; the internal density patch reads as a believable hematoma/laceration rather than a flat color block; the surrounding fluid collection is shaded consistently with blood/fluid density and follows the natural contours of the peritoneal space around the spleen, bowel, and other organs, without patches, banding, or artifacts that look inconsistent with real tissue.

Spatiotemporal Consistency rubric:
level_1: The video jumps abruptly between unrelated views (e.g., cutting from the CT slice to a cartoon or microscope image); the spleen suddenly changes size or rotates; the spleen vanishes from the frame and then shows up again later; the lighting changes inconsistently between frames; or the spleen appears split across two disconnected parts of the frame.
level_2: Multiple continuity problems appear: the spleen shifts sideways between frames without any smooth scrolling or panning motion; the surrounding abdominal cavity's texture or contrast changes abruptly; the apparent slice thickness or field of view changes partway through; or the lighting flickers or casts a shadow that doesn't match a consistent light source.
level_3: One minor flaw is present (for instance a slight jitter in the image's position, a brief blur during a pan, or a passing shadow inconsistency), but otherwise the spleen stays in its anatomical location, the abdominal cavity background stays coherent, and the axial orientation is preserved for the whole video.
level_4: Everything required for score 3 holds, and in addition: the spleen stays centered in the left upper quadrant across all frames; nearby structures (aorta, kidneys, bowel) keep the same positions relative to each other and to the spleen; nothing warps, stretches, or shifts perspective; brightness and contrast stay steady over time; any panning or zooming motion is smooth and moves in one consistent direction.
level_5: Everything required for score 4 holds, with no frame-to-frame discontinuity at all: no jitter, no blur, no lighting variation; the spleen and the structures around it occupy the same relative positions in every frame; the axial plane stays perpendicular to the body's long axis without any tilt or roll; the slice never appears to scroll backward after moving forward.