What are the factors that the tissue air ratio depends on?
Understand the Problem
The question is discussing key concepts related to radiation exposure, specifically focusing on the tissue air ratio, percentage depth dose (PDD), reference depth dose for ortho-voltage X-ray, and how radiation exposure varies with distance.
Answer
TAR does not depend on SSD.
Tissue Air Ratio (TAR) depends on field size, beam energy, and depth. It does not depend on source-to-skin distance (SSD).
Answer for screen readers
Tissue Air Ratio (TAR) depends on field size, beam energy, and depth. It does not depend on source-to-skin distance (SSD).
More Information
TAR is crucial in calculating the dose distribution for radiation therapy, helping ensure accurate dosing in treatment.
Tips
A common mistake is to assume TAR depends on SSD. It is essential to remember it depends on field size, beam energy, and depth instead.
Sources
- TAR & TMR - Radiation Therapy Review - radiation-therapy-review.com
- Monitor Unit Hand Calculations | Oncology Medical Physics - oncologymedicalphysics.com
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