Principles of radiation therapy, Physics

Principles of radiation therapy:


The basic principle of radiation therapy is to maximize damage to the tumor while minimizing damage to the normal tissue.Factors that determine how much radiation required are:


1.    The type of radiation
2.    The environment of the cell (for example its blood and oxygen supplies 
3.    The type of cell.
4.    The nucleus of the cell is more sensitive of radiation.

Some types  of radiation are more effective in killing cells or  have a higher relative biological effects(RBE)


RBE: The ratio of the number of grays of 250kVp  x- rays needed to produce a given biological effect to the number of grays of the test radiation needed to the same effect .

Lethal dose for 50%(LD50 ): the quantity of radiation that will kill half of the organisms in a population (cells ,mice, people ect)
 LD30: Theamount of radiation that will kill 50% of the organisms in 30 days ,its value for humans about 4.5 Gy.

Posted Date: 10/1/2012 7:43:54 AM | Location : United States







Related Discussions:- Principles of radiation therapy, Assignment Help, Ask Question on Principles of radiation therapy, Get Answer, Expert's Help, Principles of radiation therapy Discussions

Write discussion on Principles of radiation therapy
Your posts are moderated
Related Questions
It is the difference among potential at two points of a conductor. Please note that by potential(at a point A) ,we actually mean potential difference  among  point A and another

High temperatures and pressures are given for the following power plants. ISU co-generation:   400 psi, 750F City of Ames with RDF:   700 psi, 850F Super-critical power pl

is the surface of a conductor is equipotential


The fraction of vacancy sites in a metal is 1X10 -10 at 500 0 C.  What will be the  fraction of vacancy sites at double the temperature?

Marine Application:- Suitably designed one or double speed squirrel cage induction motors are used.

A tunnel diode is a highly conductively two terminal P-N junction doped heavily about 1000 layer width is a high conductively two terminal conventional diode. Because of heavy dopi

INSTANTANEOUS ACCELERATION: The acceleration of the body at any certain instant during its motion is called to be an instantaneous acceleration.

As we know photon's spin is one, how lots CPH (that have spin) is able keep the spin of photon? Answer; the photon spin like electron spin comes up of its properties and indepe

Force in Two and Three Dimensions - Pressure and Fluids Pressure is a force exerted over an area and is measured in Pascals (Pa). P (in Pa) = Force (in newtons) / area (