This page contains the normal tissue dose constraints for SRS-SBRT, with organ names labeled according to the AAPM TG 263 naming convention.
The lists were derived by combining the constraints from HyTEC and AAPM TG 101.
Please refer to these pages for additional information.
A few notes on the structure names:
Organ | Constraint | Notes |
Brain | V12Gy < 5 cc | HyTEC. Symptomatic necrosis (10%) |
Brain | V12Gy < 10 cc | HyTEC. Symptomatic necrosis (10%) |
Brain | V12Gy < 15 cc | HyTEC. Symptomatic necrosis (10%) |
Brainstem | Max < 15 Gy | AAPM TG 101. Cranial neuropathy. Excludes medulla |
Brainstem | D0.5cc < 10 Gy | AAPM TG 101. Cranial neuropathy. Excludes medulla |
Cochlea Left | Max < 9 Gy | AAPM TG 101. Hearing loss |
Cochlea Right | Max < 9 Gy | AAPM TG 101. Hearing loss |
Optic Chaism | Max < 10 Gy | AAPM TG 101 & HyTEC. Neuropathy (1%). Lower limit |
Optic Chaism | Max < 12 Gy | HyTEC. Neuropathy (1%). Upper limit |
Optic Chaism | D0.2cc < 8 Gy | AAPM TG 101. Neuritis |
Optic Nerve Left | Max < 10 Gy | AAPM TG 101 & HyTEC. Neuropathy (1%). Lower limit |
Optic Nerve Left | Max < 12 Gy | HyTEC. Neuropathy (1%). Upper limit |
Optic Nerve Left | D0.2cc < 8 Gy | AAPM TG 101. Neuritis |
Optic Nerve Right | Max < 10 Gy | AAPM TG 101 & HyTEC. Neuropathy (1%). Lower limit |
Optic Nerve Right | Max < 12 Gy | HyTEC. Neuropathy (1%). Upper limit |
Optic Nerve Right | D0.2cc < 8 Gy | AAPM TG 101. Neuritis |
Spinal Cord | Max < 12.4 Gy | HyTEC. Myelopathy (1-5%). No prior RT. Lower limit |
Spinal Cord | Max < 14 Gy | AAPM TG 101 & HyTEC. Myelopathy (1-5%). No prior RT. Upper limit |
Spinal Cord | D0.35cc < 10 Gy | AAPM TG 101. Myelitis |
Spinal Cord | D1.2cc < 7 Gy | AAPM TG 101. Myelitis |
Organ | Constraint | Notes |
Brachial Plexus Left | Max < 24 Gy | AAPM TG 101. Neuropathy |
Brachial Plexus Left | D3cc < 20.4 Gy | AAPM TG 101. Neuropathy |
Brachial Plexus Right | Max < 24 Gy | AAPM TG 101. Neuropathy |
Brachial Plexus Right | D3cc < 20.4 Gy | AAPM TG 101. Neuropathy |
Bronchus | Max < 23.1 Gy | AAPM TG 101. Stenosis/atelectasis |
Bronchus | D0.5cc < 18.9 Gy | AAPM TG 101. Stenosis/atelectasis |
Chest Wall | Max < 36.9 Gy | AAPM TG 101. Pain |
Chest Wall | D1cc < 28.8 Gy | AAPM TG 101. Pain |
Chest Wall | D30cc < 30 Gy | AAPM TG 101. Pain |
Esophagus | Max < 25.2 Gy | AAPM TG 101. Stenosis/fistula |
Esophagus | D5cc < 17.7 Gy | AAPM TG 101. Stenosis/fistula |
Great Vessels | Max < 45 Gy | AAPM TG 101. Aneurysm. Includes aorta, vena cava, and pulmonary |
Great Vessels | D10cc < 39 Gy | AAPM TG 101. Aneurysm. Includes aorta, vena cava, and pulmonary |
Heart | Max < 30 Gy | AAPM TG 101. Pericarditis. Pericardium only |
Heart | D15cc < 24 Gy | AAPM TG 101. Pericarditis. Pericardium only |
Lungs | Mean < 8 Gy | HyTEC. Grade 2+ toxicity (10-15%). Excludes target |
Lungs | V20Gy < 10 % | HyTEC. Grade 2+ toxicity (10-15%). Excludes target. Lower limit |
Lungs | V20Gy < 15 % | HyTEC. Grade 2+ toxicity (10-15%). Excludes target. Upper limit |
Lungs | D1500cc < 10.5 Gy | AAPM TG 101. Pneumonitis/fibrosis |
Lungs | D1000cc < 11.4 Gy | AAPM TG 101. Pneumonitis/fibrosis |
Main Bronchus | Max < 30 Gy | AAPM TG 101. Stenosis/fistula |
Main Bronchus | D4cc < 15 Gy | AAPM TG 101. Stenosis/fistula |
Pericardium | Max < 30 Gy | AAPM TG 101. Pericarditis |
Pericardium | D15cc < 24 Gy | AAPM TG 101. Pericarditis |
Rib | Max < 36.9 Gy | AAPM TG 101. Fracture |
Rib | D1cc < 28.8 Gy | AAPM TG 101. Fracture |
Rib | D30cc < 30 Gy | AAPM TG 101. Fracture |
Spinal Cord | Max < 20.3 Gy | HyTEC. Myelopathy (1-5%). No prior RT. Lower limit |
Spinal Cord | Max < 23.1 Gy | HyTEC. Myelopathy (1-5%). No prior RT. Upper limit |
Spinal Cord | D0.35cc < 18 Gy | AAPM TG 101. Myelitis |
Spinal Cord | D1.2cc < 12.3 Gy | AAPM TG 101. Myelitis |
Trachea | Max < 30 Gy | AAPM TG 101. Stenosis/fistula |
Trachea | D4cc < 15 Gy | AAPM TG 101. Stenosis/fistula |
Organ | Constraint | Notes |
Brachial Plexus Left | Max < 30.5 Gy | AAPM TG 101. Neuropathy |
Brachial Plexus Left | D3cc < 27 Gy | AAPM TG 101. Neuropathy |
Brachial Plexus Right | Max < 30.5 Gy | AAPM TG 101. Neuropathy |
Brachial Plexus Right | D3cc < 27 Gy | AAPM TG 101. Neuropathy |
Bronchus | Max < 33 Gy | AAPM TG 101. Stenosis/atelectasis |
Bronchus | D0.5cc < 21 Gy | AAPM TG 101. Stenosis/atelectasis |
Chest Wall | Max < 43 Gy | AAPM TG 101. Pain |
Chest Wall | D1cc < 35 Gy | AAPM TG 101. Pain |
Esophagus | Max < 35 Gy | AAPM TG 101. Stenosis/fistula |
Esophagus | D5cc < 19.5 Gy | AAPM TG 101. Stenosis/fistula |
Great Vessels | Max < 53 Gy | AAPM TG 101. Aneurysm. Includes aorta, vena cava, and pulmonary |
Great Vessels | D10cc < 47 Gy | AAPM TG 101. Aneurysm. Includes aorta, vena cava, and pulmonary |
Heart | Max < 38 Gy | AAPM TG 101. Pericarditis. Pericardium only |
Heart | D15cc < 32 Gy | AAPM TG 101. Pericarditis. Pericardium only |
Lungs | Mean < 8 Gy | HyTEC. Grade 2+ toxicity (10-15%). Excludes target |
Lungs | V20Gy < 10 % | HyTEC. Grade 2+ toxicity (10-15%). Excludes target. Lower limit |
Lungs | V20Gy < 15 % | HyTEC. Grade 2+ toxicity (10-15%). Excludes target. Upper limit |
Lungs | D1500cc < 12.5 Gy | AAPM TG 101. Pneumonitis/fibrosis |
Lungs | D1000cc < 13.5 Gy | AAPM TG 101. Pneumonitis/fibrosis |
Main Bronchus | Max < 40 Gy | AAPM TG 101. Stenosis/fistula |
Main Bronchus | D4cc < 16.5 Gy | AAPM TG 101. Stenosis/fistula |
Pericardium | Max < 38 Gy | AAPM TG 101. Pericarditis |
Pericardium | D15cc < 32 Gy | AAPM TG 101. Pericarditis |
Rib | Max < 43 Gy | AAPM TG 101. Fracture |
Rib | D1cc < 35 Gy | AAPM TG 101. Fracture |
Spinal Cord | Max < 25.3 Gy | HyTEC. Myelopathy (1-5%). No prior RT. Lower limit |
Spinal Cord | Max < 28.8 Gy | HyTEC. Myelopathy (1-5%). No prior RT. Upper limit |
Spinal Cord | D0.35cc < 23 Gy | AAPM TG 101. Myelitis |
Spinal Cord | D1.2cc < 14.5 Gy | AAPM TG 101. Myelitis |
Trachea | Max < 40 Gy | AAPM TG 101. Stenosis/fistula |
Trachea | D4cc < 16.5 Gy | AAPM TG 101. Stenosis/fistula |
Organ | Constraint | Notes |
Bladder | V100% < 5 cc | HyTEC. Late grade 2+ urinary toxicity (< 20%). Lower limit |
Bladder | V100% < 10 cc | HyTEC. Late grade 2+ urinary toxicity (< 20%). Upper limit |
Bladder Wall | Max < 38 Gy | AAPM TG 101. Cystitis/fistula |
Bladder Wall | D15cc < 18.3 Gy | AAPM TG 101. Cystitis/fistula |
Cauda Equina | Max < 32 Gy | AAPM TG 101. Neuritis |
Cauda Equina | D5cc < 30 Gy | AAPM TG 101. Neuritis |
Colon | Max < 38 Gy | AAPM TG 101. Colitis/fistula |
Colon | D20cc < 25 Gy | AAPM TG 101. Colitis/fistula |
Femur Head Left | D10cc < 30 Gy | AAPM TG 101. Necrosis |
Femur Head Right | D10cc < 30 Gy | AAPM TG 101. Necrosis |
Penile Bulb | Max < 50 Gy | AAPM TG 101. Erectile dysfunction |
Penile Bulb | D3cc < 30 Gy | AAPM TG 101. Erectile dysfunction |
Rectum | Max < 35 Gy | HyTEC. Late grade 3+ bowel toxicity (< 3%). Lower limit |
Rectum | Max < 38 Gy | AAPM TG 101 & HyTEC. Late grade 3+ bowel toxicity (< 3%). Upper limit |
Rectum | D20cc < 25 Gy | AAPM TG 101. Colitis/fistula |
Sacral Plexus | Max < 32 Gy | AAPM TG 101. Neuropathy |
Sacral Plexus | D5cc < 30 Gy | AAPM TG 101. Neuropathy |
Small Bowel | Max < 35 Gy | AAPM TG 101. Enteritis/obstruction. Includes jejunum and ileum |
Small Bowel | D5cc < 19.5 Gy | AAPM TG 101. Enteritis/obstruction. Includes jejunum and ileum |
Urethra | Max < 38 Gy | HyTEC. Late grade 2+ urinary toxicity (< 20%). Lower limit |
Urethra | Max < 42 Gy | HyTEC. Late grade 2+ urinary toxicity (< 20%). Upper limit |