The radiation tolerance of the whole liver as –
**Core Concept**
Radiation tolerance refers to the maximum dose of radiation that an organ can withstand without suffering significant damage. In the context of radiation therapy, understanding the radiation tolerance of various organs is crucial to avoid complications and ensure effective treatment.
**Why the Correct Answer is Right**
The whole liver has a relatively high radiation tolerance, with a tolerance dose of approximately 30-35 Gy (3000-3500 rads) in a single fraction. This is because the liver has a high capacity for regeneration and can tolerate a significant amount of radiation damage. However, the tolerance dose can vary depending on the radiation fractionation schedule and the presence of underlying liver disease.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the radiation tolerance of the whole liver is not as low as 15 Gy. While the tolerance dose can vary depending on the radiation fractionation schedule, the whole liver can generally tolerate higher doses of radiation.
**Option B:** This option is incorrect because the radiation tolerance of the whole lung is lower than that of the whole liver, typically around 20-25 Gy.
**Option C:** This option is incorrect because the radiation tolerance of the spinal cord is lower than that of the whole liver, typically around 45-50 Gy.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the radiation tolerance of organs can vary depending on the radiation fractionation schedule and the presence of underlying disease. In general, organs with a high capacity for regeneration, such as the liver, tend to have a higher radiation tolerance.
**Correct Answer: D. 30-35 Gy**