TotalSegmentator CT
TotalSegmentator CT (version 2.5.0) is a peer-reviewed CT Image Segmentation model for human medical imaging, available to run on managed, EU-hosted cloud GPUs through Nalvera.AI — upload a scan, run the model, and download reproducible, open-format results with no local GPU or CUDA setup.
Model card
Description
Whole-body human CT segmentation tool that maps 117 anatomical structures — organs, bones, muscles, and major vessels — in a single pass.
Training data
Trained on 1,228 CT studies (TotalSegmentator v2 dataset, Wasserthal et al. 2023) spanning diverse scanners, contrast phases, and pathologies; annotations semi-automatically generated and expert-reviewed. Predominantly adult human anatomy.
Intended use
Research segmentation of 117 anatomical structures in whole-body or regional CT. Intended for cohort analysis, morphometry, and as a starting point for manual correction — NOT for primary diagnosis or treatment planning.
Known limitations
Accuracy degrades on severe pathology, post-surgical anatomy, metal/implant artefact, paediatric scans, and non-standard fields of view or low-dose/very-thin-slice acquisitions. Small structures (e.g. adrenal glands, small vessels) are the least reliable.
Expected runtime
~1–3 min/scan on a modern GPU (medium class); longer for high-resolution thoracic or whole-body volumes.
Input modality
CT
Species
human
Output format
.nii.gz
Output classes (117)
1 spleen2 kidney_right3 kidney_left4 gallbladder5 liver6 stomach7 pancreas8 adrenal_gland_right9 adrenal_gland_left10 lung_upper_lobe_left11 lung_lower_lobe_left12 lung_upper_lobe_right13 lung_middle_lobe_right14 lung_lower_lobe_right15 esophagus16 trachea17 thyroid_gland18 small_bowel19 duodenum20 colon21 urinary_bladder22 prostate23 kidney_cyst_left24 kidney_cyst_right25 sacrum26 vertebrae_S127 vertebrae_L528 vertebrae_L429 vertebrae_L330 vertebrae_L231 vertebrae_L132 vertebrae_T1233 vertebrae_T1134 vertebrae_T1035 vertebrae_T936 vertebrae_T837 vertebrae_T738 vertebrae_T639 vertebrae_T540 vertebrae_T441 vertebrae_T342 vertebrae_T243 vertebrae_T144 vertebrae_C745 vertebrae_C646 vertebrae_C547 vertebrae_C448 vertebrae_C349 vertebrae_C250 vertebrae_C151 heart52 aorta53 pulmonary_vein54 brachiocephalic_trunk55 subclavian_artery_right56 subclavian_artery_left57 common_carotid_artery_right58 common_carotid_artery_left59 brachiocephalic_vein_left60 brachiocephalic_vein_right61 atrial_appendage_left62 superior_vena_cava63 inferior_vena_cava64 portal_vein_and_splenic_vein65 iliac_artery_left66 iliac_artery_right67 iliac_vena_left68 iliac_vena_right69 humerus_left70 humerus_right71 scapula_left72 scapula_right73 clavicula_left74 clavicula_right75 femur_left76 femur_right77 hip_left78 hip_right79 spinal_cord80 gluteus_maximus_left81 gluteus_maximus_right82 gluteus_medius_left83 gluteus_medius_right84 gluteus_minimus_left85 gluteus_minimus_right86 autochthon_left87 autochthon_right88 iliopsoas_left89 iliopsoas_right90 brain91 skull92 rib_left_193 rib_left_294 rib_left_395 rib_left_496 rib_left_597 rib_left_698 rib_left_799 rib_left_8100 rib_left_9101 rib_left_10102 rib_left_11103 rib_left_12104 rib_right_1105 rib_right_2106 rib_right_3107 rib_right_4108 rib_right_5109 rib_right_6110 rib_right_7111 rib_right_8112 rib_right_9113 rib_right_10114 rib_right_11115 rib_right_12116 sternum117 costal_cartilages
Citations & references
Research use only — not a medical device. Outputs are not
validated for clinical diagnosis or treatment.
Run this model →