Domain: Healthcare — Imaging Medicine
Target concept: X-ray Radiographic Appearance of Gallstones (Positive Stones)

Video generation prompt: Radiographs of the abdomen were performed on simulated gallbladder positive stone patients to observe the morphology and number of high-density shadows in the gallbladder region.

Evaluation guide:
(i) Target concept: Radiographic visualization of calcified gallstones as static, high-density, intraluminal objects in the gallbladder region on a plain abdominal X-ray.
Minimum mechanism: X-ray photons are attenuated by calcium-rich stones more than surrounding soft tissue or bile, producing a persistent white silhouette on the detector; the gallbladder must be anatomically positioned and non-distended to allow clear localization without superimposition.
(ii)Storyline: Frame 1–2: Static AP abdominal radiograph scene established (ribs, spine, liver shadow, bowel gas visible); Frame 3–6: Gallbladder region identified in right upper quadrant (soft-tissue density oval below ribs, adjacent to liver); Frame 7–10: One or more discrete, sharply bordered, uniformly white shadows appear *only* within that region: fixed in place, unchanged in shape/density, with no motion, fading, or emergence from outside; viewpoint remains fixed anterior-posterior with no rotation, zoom, or tilt.

Manual:
Experimental Procedure
1. Position simulated patient supine for abdominal radiograph.
2. Acquire static anteroposterior (AP) abdominal X-ray image.
3. Display resulting radiograph on diagnostic monitor.
Observation of Experimental Phenomena
A single or multiple sharply defined, uniformly white, rounded-to-ovoid high-density shadows appear within the right upper quadrant, confined to the anatomical region of the gallbladder — consistently located inferior to liver shadow and adjacent to right kidney, without overlap with bowel gas or vertebral bodies.
Summary of Experimental Principles
Positive gallstones contain calcium salts and are radiopaque; they appear as high-density (white) shadows on plain abdominal radiographs, localized to the gallbladder fossa.

Prompt Grounding rubric:
level_1: No abdominal radiograph is shown; the gallbladder region cannot be identified anywhere in the frame; there are no high-density (bright white) shadows visible; nothing in the scene suggests a simulated imaging setup for gallstone observation.
level_2: An abdominal radiograph is shown, but the gallbladder region is not identifiable; if any bright shadow appears, it sits in an anatomically wrong place (e.g., over the spine, a kidney, or a gas-filled bowel loop) rather than in the right-upper-quadrant gallbladder area.
level_3: An abdominal radiograph is shown with an identifiable gallbladder region (right-upper-quadrant location, near the liver shadow, below the ribs); at least one bright, high-density shadow is visible somewhere within that region; the number of shadows shown (between 1 and 4) is visually countable.
level_4: All elements from score 3 are present AND every visible shadow sits inside a single contiguous area matching the expected oval/pear outline of the gallbladder, with none overlapping the spine or visible bowel gas pattern; the total count of shadows visible is between 1 and 4, matching a clinically plausible presentation.
level_5: All elements from score 4 are present AND no extraneous bright object appears elsewhere on the film that could be mistaken for an additional stone; the radiograph framing keeps the gallbladder region fully and comparably visible throughout; no other slides, labels, or on-screen text distract from the imaging scene.

Scientific and Causal Correctness rubric:
level_1: No connection is shown between the imaging setup and the appearance of any shadow; any bright areas shown are dark/low-density rather than white, or match the density of ordinary soft tissue, inconsistent with radiopaque (positive) stones.
level_2: High-density white shadows are present, but sit in an anatomically implausible place (e.g., inside a vertebra or overlapping the lung field); a shadow changes brightness or vanishes partway through the clip; there is no stable association between the shadow(s) and the gallbladder region; nothing in the scene indicates a static X-ray exposure (e.g., it looks like continuous fluoroscopy instead).
level_3: The shadows are bright white, sit in the right-upper-quadrant gallbladder area, and stay in place with unchanging brightness and shape for the whole clip, consistent with calcified, radiopaque stones on a plain X-ray; nothing in the scene contradicts this (no motion blur suggesting live fluoroscopy, no shadow rendered as translucent/gray the way a non-radiopaque stone would appear).
level_4: All elements from score 3 are present AND the scene reads as a single static radiograph the whole time (no real-time motion, no contrast-injection cues, no visible tube or camera movement); none of the bright shadows resembles a common radiographic mimic of a stone (e.g., a surgical clip, a phlebolith, or a calcified lymph node) sitting outside the gallbladder region; none of the shadows overlaps the kidney or pelvis.
level_5: All elements from score 4 are present AND each shadow has a rounded or faceted (not spiky or branching) outline with crisp, well-defined edges rather than a blurred or diffuse border; each shadow looks uniformly and solidly white with no internal texture or darker core, and shows no lighter halo or rim surrounding it, all consistent with the classic plain-film appearance of pure calcium-based gallstones.

Spatiotemporal Consistency rubric:
level_1: The gallbladder region suddenly jumps to a different part of the frame; a shadow appears or disappears from one frame to the next with no transition; the whole image flashes between fully black and fully white; the rib cage or liver shadow visibly breaks apart or reappears differently shaped.
level_2: The gallbladder region shifts by more than about a third of its width between frames; a shadow flickers in and out inconsistently; a shadow's size or shape changes noticeably from one frame to the next; the clip shows visible cuts or splices; the direction of shading/contrast on the image flips without any apparent cause.
level_3: The gallbladder region stays in the same place and orientation throughout; each shadow keeps the same position relative to the others and to nearby landmarks (ribs, spine) across the whole clip; nothing jumps, flickers, or is spliced together; the overall brightness and contrast of the image stay steady; there are no dropped or stuttering frames.
level_4: All elements from score 3 are present AND the rib cage and spine do not bow or warp in a way a real X-ray wouldn't (no barrel/pincushion-style bending of the bony structures); the gallbladder region does not appear to zoom in or out over the clip; the whole image behaves as though captured from one fixed anteroposterior view, without any part of the anatomy shifting relative to another as if seen from a different angle.
level_5: All elements from score 4 are present AND the motion across frames looks fully smooth, with no stepping or strobing; each shadow shows no visible drift relative to nearby anatomical landmarks (ribs, spine, bowel gas pattern) across the whole clip; the background anatomy keeps the same spatial relationships in every frame; there is no ghosting or doubled edges anywhere in the image.