TotalSegmentator CT

Version 2.18.0 · Licence Apache-2.0 · Released 2026-08-23

TotalSegmentator CT segments organs, bones, muscles, and vessels in CT scans. Choose whole-body segmentation or a task for a specific anatomical region or finding.

Available tasks (24)

Task options define what the model does. Choose one when you submit a scan or configure generation.

Input: CT scan.
Output: Segmentation label map (.nii.gz).

Total — full body (117 structures)

Default

Default task: 117 anatomical structures across organs, vessels, bones, and muscles.

View 117 output classes

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

Lung vessels & airways

Pulmonary vasculature and airway structures.

View 4 output classes

1 lung_airways2 lung_airways_wall3 lung_arteries4 lung_veins

Body outline

Body outline and extremity / skin segmentation.

View 2 output classes

1 body_trunc2 body_extremities

Cerebral bleed

Intracerebral hemorrhage segmentation (research).

View 1 output class

1 intracerebral_hemorrhage

Hip implant

Hip implant segmentation.

View 1 output class

1 hip_implant

Pleural / pericardial effusion

Pleural and pericardial fluid segmentation.

View 3 output classes

1 lung_pleural2 pleural_effusion3 pericardial_effusion

Head glands & cavities

Head glands, cavities, and eye structures.

View 19 output classes

1 eye_left2 eye_right3 eye_lens_left4 eye_lens_right5 optic_nerve_left6 optic_nerve_right7 parotid_gland_left8 parotid_gland_right9 submandibular_gland_right10 submandibular_gland_left11 nasopharynx12 oropharynx13 hypopharynx14 nasal_cavity_right15 nasal_cavity_left16 auditory_canal_right17 auditory_canal_left18 soft_palate19 hard_palate

Head muscles

Mastication and head muscles.

View 11 output classes

1 masseter_right2 masseter_left3 temporalis_right4 temporalis_left5 lateral_pterygoid_right6 lateral_pterygoid_left7 medial_pterygoid_right8 medial_pterygoid_left9 tongue10 digastric_right11 digastric_left

Head/neck bones & vessels

Head/neck bones, larynx, thyroid cartilage, and major vessels.

View 12 output classes

1 larynx_air2 thyroid_cartilage3 hyoid4 cricoid_cartilage5 zygomatic_arch_right6 zygomatic_arch_left7 styloid_process_right8 styloid_process_left9 internal_carotid_artery_right10 internal_carotid_artery_left11 internal_jugular_vein_right12 internal_jugular_vein_left

Head/neck muscles

Neck and throat muscles.

View 23 output classes

1 sternocleidomastoid_right2 sternocleidomastoid_left3 superior_pharyngeal_constrictor4 middle_pharyngeal_constrictor5 inferior_pharyngeal_constrictor6 trapezius_right7 trapezius_left8 platysma_right9 platysma_left10 levator_scapulae_right11 levator_scapulae_left12 anterior_scalene_right13 anterior_scalene_left14 middle_scalene_right15 middle_scalene_left16 posterior_scalene_right17 posterior_scalene_left18 sterno_thyroid_right19 sterno_thyroid_left20 thyrohyoid_right21 thyrohyoid_left22 prevertebral_right23 prevertebral_left

Liver vessels & tumor

Hepatic vasculature and tumor structures.

View 2 output classes

1 liver_vessels2 liver_tumor

Oculomotor muscles

Eye muscles and related orbital structures.

View 19 output classes

1 skull2 eyeball_right3 lateral_rectus_muscle_right4 superior_oblique_muscle_right5 levator_palpebrae_superioris_right6 superior_rectus_muscle_right7 medial_rectus_muscle_left8 inferior_oblique_muscle_right9 inferior_rectus_muscle_right10 optic_nerve_left11 eyeball_left12 lateral_rectus_muscle_left13 superior_oblique_muscle_left14 levator_palpebrae_superioris_left15 superior_rectus_muscle_left16 medial_rectus_muscle_right17 inferior_oblique_muscle_left18 inferior_rectus_muscle_left19 optic_nerve_right

Lung nodules

Lung tissue and nodule segmentation.

View 2 output classes

1 lung2 lung_nodules

Kidney cysts

Improved kidney cyst segmentation.

View 2 output classes

1 kidney_cyst_left2 kidney_cyst_right

Breasts

Breast tissue segmentation.

View 1 output class

1 breast

Liver segments (Couinaud)

Couinaud liver segment classification.

View 8 output classes

1 liver_segment_12 liver_segment_23 liver_segment_34 liver_segment_45 liver_segment_56 liver_segment_67 liver_segment_78 liver_segment_8

Craniofacial structures

Skull, jaw, teeth, and sinus cavities.

View 7 output classes

1 mandible2 teeth_lower3 skull4 head5 sinus_maxillary6 sinus_frontal7 teeth_upper

Abdominal muscles

Trunk and abdominal wall muscles (T4–L4 range).

View 22 output classes

1 pectoralis_major_right2 pectoralis_major_left3 rectus_abdominis_right4 rectus_abdominis_left5 serratus_anterior_right6 serratus_anterior_left7 latissimus_dorsi_right8 latissimus_dorsi_left9 trapezius_right10 trapezius_left11 external_oblique_right12 external_oblique_left13 internal_oblique_right14 internal_oblique_left15 erector_spinae_right16 erector_spinae_left17 transversospinalis_right18 transversospinalis_left19 psoas_major_right20 psoas_major_left21 quadratus_lumborum_right22 quadratus_lumborum_left

Teeth (FDI numbering)

Comprehensive dental structures including individual teeth with FDI numbering.

View 77 output classes

1 lower_jawbone2 upper_jawbone3 left_inferior_alveolar_canal4 right_inferior_alveolar_canal5 left_maxillary_sinus6 right_maxillary_sinus7 pharynx8 bridge9 crown10 implant11 upper_right_central_incisor_fdi1112 upper_right_lateral_incisor_fdi1213 upper_right_canine_fdi1314 upper_right_first_premolar_fdi1415 upper_right_second_premolar_fdi1516 upper_right_first_molar_fdi1617 upper_right_second_molar_fdi1718 upper_right_third_molar_fdi1819 upper_left_central_incisor_fdi2120 upper_left_lateral_incisor_fdi2221 upper_left_canine_fdi2322 upper_left_first_premolar_fdi2423 upper_left_second_premolar_fdi2524 upper_left_first_molar_fdi2625 upper_left_second_molar_fdi2726 upper_left_third_molar_fdi2827 lower_left_central_incisor_fdi3128 lower_left_lateral_incisor_fdi3229 lower_left_canine_fdi3330 lower_left_first_premolar_fdi3431 lower_left_second_premolar_fdi3532 lower_left_first_molar_fdi3633 lower_left_second_molar_fdi3734 lower_left_third_molar_fdi3835 lower_right_central_incisor_fdi4136 lower_right_lateral_incisor_fdi4237 lower_right_canine_fdi4338 lower_right_first_premolar_fdi4439 lower_right_second_premolar_fdi4540 lower_right_first_molar_fdi4641 lower_right_second_molar_fdi4742 lower_right_third_molar_fdi4843 left_mandibular_incisive_canal_fdi10344 right_mandibular_incisive_canal_fdi10445 lingual_canal46 upper_right_central_incisor_pulp_fdi11147 upper_right_lateral_incisor_pulp_fdi11248 upper_right_canine_pulp_fdi11349 upper_right_first_premolar_pulp_fdi11450 upper_right_second_premolar_pulp_fdi11551 upper_right_first_molar_pulp_fdi11652 upper_right_second_molar_pulp_fdi11753 upper_right_third_molar_pulp_fdi11854 upper_left_central_incisor_pulp_fdi12155 upper_left_lateral_incisor_pulp_fdi12256 upper_left_canine_pulp_fdi12357 upper_left_first_premolar_pulp_fdi12458 upper_left_second_premolar_pulp_fdi12559 upper_left_first_molar_pulp_fdi12660 upper_left_second_molar_pulp_fdi12761 upper_left_third_molar_pulp_fdi12862 lower_left_central_incisor_pulp_fdi13163 lower_left_lateral_incisor_pulp_fdi13264 lower_left_canine_pulp_fdi13365 lower_left_first_premolar_pulp_fdi13466 lower_left_second_premolar_pulp_fdi13567 lower_left_first_molar_pulp_fdi13668 lower_left_second_molar_pulp_fdi13769 lower_left_third_molar_pulp_fdi13870 lower_right_central_incisor_pulp_fdi14171 lower_right_lateral_incisor_pulp_fdi14272 lower_right_canine_pulp_fdi14373 lower_right_first_premolar_pulp_fdi14474 lower_right_second_premolar_pulp_fdi14575 lower_right_first_molar_pulp_fdi14676 lower_right_second_molar_pulp_fdi14777 lower_right_third_molar_pulp_fdi148

Trunk cavities

Body cavity structures and pericardium.

View 4 output classes

1 abdominal_cavity2 thoracic_cavity3 pericardium4 mediastinum

Cerebral ventricle parts

Cerebral ventricle subdivisions.

View 12 output classes

1 ventricle_frontal_horn_left2 ventricle_occipital_horn_left3 ventricle_body_left4 ventricle_temporal_horn_left5 ventricle_trigone_left6 ventricle_frontal_horn_right7 ventricle_occipital_horn_right8 ventricle_body_right9 ventricle_temporal_horn_right10 ventricle_trigone_right11 third_ventricle12 fourth_ventricle

Liver lesions

Hepatic lesion segmentation.

View 1 output class

1 liver_lesions

Vertebrae — per-vertebra bodies

Vertebral bodies C1–L5 with one label per vertebra (24 classes). A dedicated model with added postprocessing — markedly fewer per-vertebra labelling errors (level swaps) than the vertebrae classes of the 'total' task.

View 24 output classes

1 vertebrae_C12 vertebrae_C23 vertebrae_C34 vertebrae_C45 vertebrae_C56 vertebrae_C67 vertebrae_C78 vertebrae_T19 vertebrae_T210 vertebrae_T311 vertebrae_T412 vertebrae_T513 vertebrae_T614 vertebrae_T715 vertebrae_T816 vertebrae_T917 vertebrae_T1018 vertebrae_T1119 vertebrae_T1220 vertebrae_L121 vertebrae_L222 vertebrae_L323 vertebrae_L424 vertebrae_L5

Vertebrae — per-vertebra bodies (refined borders)

Vertebral bodies C1–L5 with one label per vertebra (24 classes), refined with the vertebrae_body model for sharper borders. More accurate contours than vertebrae_pp at a longer runtime (runs two models).

View 24 output classes

Research details

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.

Species

human

Citations & references

Citing Nalvera.AI

Please cite the platform alongside the model's own paper listed above — the model authors deserve the credit for the method.

@misc{nalvera,
  title        = {Nalvera.AI: a cloud platform for medical-imaging AI},
  author       = {{van der Heyden, Brent}},
  year         = {2026},
  howpublished = {\url{https://nalvera.ai}},
  note         = {Model: TotalSegmentator CT v2.18.0. Accessed YYYY-MM-DD}
}

Research use only — not a medical device. Outputs are not validated for clinical diagnosis or treatment.

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