Dose to Critical Structures
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Can we please get your advice on this one question?
The dose to critical structures plays a very important role in treatment plan evaluation and forms a major challenging parameter in radiotherapy treatment planning. Critical structures will vary for the site to site in the body, for that the on the basis of site of the tumour the critical organs doses are mentioned as follows.
Head & Neck Tumors:
The critical organs and its doses are mentioned below.
- Brain 45 Gy
- Brainstem 50 Gy
- Pituitary Gland 05 Gy
- Eyes 35 Gy
- Optic Nerve 50 Gy
- Optic chiasma 60 Gy
- Larynx 45 GY
- Temporomandibular 60 Gy
joint & Mandible
- Parotid 27 Gy
- Spinal cord 47 Gy
- Salivary glands 32 Gy
- Thyroid 45 Gy
- Oral Cavity & Pharynx 60 Gy
- Salivary Glands 32 Gy
- Middle ear 30 Gy
Pelvic cancers:
- Bladder 65 Gy
- Rectum 60 Gy
- Uterus 90 Gy
- Vagina 70 Gy
- Testes 1 Gy
- Ovaries 2-3 Gy
- Femoral head 52 Gy
Thorax cancers:
- Lung 17.5 Gy
- Heart 40 Gy
- Oesophagus 55 Gy
- Spinal cord 47 Gy
- Lymph nodes 50 Gy
- Rib cage 50 Gy
Abdominal Cancers:
- Liver 30 Gy
- Stomach 50 Gy
- Kidney 23 Gy
- Small intestine 40 Gy
- Colon 45 Gy
- Adrenal glands 60 Gy
- Pancreas 30 Gy
Other sites:
- Skin 55 Gy
- Peripheral Nerves 60 Gy
Questions:
1. Liver has the capability of withstand up to dose of
a) 40 Gy
b) 30 Gy
c) 20 Gy
d) All
2. What is the whole volume dose for lungs?
a) 20 Gy
b) 15 Gy
c) 17.5 Gy
d) None of these
Answer:
1. b) 30 Gy
2. c) 17.5 Gy
References:
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