Chest to hip anatomy on MRI

On T1-weighted, T2-weighted, and Dixon MRI, MRSegmentator segments 40 structures from the chest to the hips: organs, large vessels, the spine, hip bones, femurs, and the back and hip muscles, with kidneys, lungs, iliac vessels, and muscles split by side. Large cohort studies use it to compare organ volumes, build reference values, and pool measurements across sequences and scanners.

Find answers to research questions like: How do liver, spleen, and kidney volumes vary with age and sex across a large cohort? Which organ volumes change most between repeat visits? Do volumes from different sequences agree well enough to pool?

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Axial slice of abdominal MRI, outlined: Left iliac artery, Right iliac artery, Left iliac vena, Right iliac vena, Small bowel, Colon, Spine, Left hip, Left autochthonous muscle, Right autochthonous muscle, and 2 more — Axial

Sagittal slice of abdominal MRI, outlined: Right kidney, Gallbladder, Liver, Right lung, Portal vein and splenic vein, Small bowel, Duodenum, Colon, Right autochthonous muscle, Right iliopsoas muscle — Sagittal

Coronal slice of abdominal MRI, outlined: Spleen, Right kidney, Left kidney, Liver, Stomach, Pancreas, Right adrenal gland, Left adrenal gland, Left lung, Right lung, and 10 more — Coronal

Found in this example

Spleen
Right kidney
Left kidney
Gallbladder
Liver
Stomach
Pancreas
Right adrenal gland
Left adrenal gland
Left lung
Right lung
Heart
Aorta
Inferior vena cava
Portal vein and splenic vein
Left iliac artery
Right iliac artery
Left iliac vena
Right iliac vena
Esophagus
Small bowel
Duodenum
Colon
Spine
Left hip
Left autochthonous muscle
Right autochthonous muscle
Left iliopsoas muscle
Right iliopsoas muscle

Also finds: Urinary bladder, Sacrum, Right hip, Left femur, Right femur, Left gluteus maximus, Right gluteus maximus, Left gluteus medius, Right gluteus medius, Left gluteus minimus, Right gluteus minimus

Example scan: abdominal MRI, AMOS dataset