# Correlated histogram representation of Monte Carlo derived medical accelerator photon-output phase space

## Abstract

A method is provided to represent the calculated phase space of photons emanating from medical accelerators used in photon teletherapy. The method reproduces the energy distributions and trajectories of the photons originating in the bremsstrahlung target and of photons scattered by components within the accelerator head. The method reproduces the energy and directional information from sources up to several centimeters in radial extent, so it is expected to generalize well to accelerators made by different manufacturers. The method is computationally both fast and efficient overall sampling efficiency of 80% or higher for most field sizes. The computational cost is independent of the number of beams used in the treatment plan.

- Inventors:

- (Livermore, CA)

- Issue Date:

- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

- OSTI Identifier:
- 875119

- Patent Number(s):
- 6535837

- Assignee:
- The Regents of the University of California (Oakland, CA) LLNL

- DOE Contract Number:
- W-7405-ENG-48

- Resource Type:
- Patent

- Country of Publication:
- United States

- Language:
- English

- Subject:
- correlated; histogram; representation; monte; carlo; derived; medical; accelerator; photon-output; phase; space; method; provided; represent; calculated; photons; emanating; accelerators; photon; teletherapy; reproduces; energy; distributions; trajectories; originating; bremsstrahlung; target; scattered; components; head; directional; information; sources; centimeters; radial; extent; expected; generalize; manufacturers; computationally; fast; efficient; overall; sampling; efficiency; 80; field; sizes; computational; cost; independent; beams; treatment; plan; monte carlo; phase space; /702/378/600/

### Citation Formats

```
Schach Von Wittenau, Alexis E.
```*Correlated histogram representation of Monte Carlo derived medical accelerator photon-output phase space*. United States: N. p., 2003.
Web.

```
Schach Von Wittenau, Alexis E.
```*Correlated histogram representation of Monte Carlo derived medical accelerator photon-output phase space*. United States.

```
Schach Von Wittenau, Alexis E. Wed .
"Correlated histogram representation of Monte Carlo derived medical accelerator photon-output phase space". United States. https://www.osti.gov/servlets/purl/875119.
```

```
@article{osti_875119,
```

title = {Correlated histogram representation of Monte Carlo derived medical accelerator photon-output phase space},

author = {Schach Von Wittenau, Alexis E.},

abstractNote = {A method is provided to represent the calculated phase space of photons emanating from medical accelerators used in photon teletherapy. The method reproduces the energy distributions and trajectories of the photons originating in the bremsstrahlung target and of photons scattered by components within the accelerator head. The method reproduces the energy and directional information from sources up to several centimeters in radial extent, so it is expected to generalize well to accelerators made by different manufacturers. The method is computationally both fast and efficient overall sampling efficiency of 80% or higher for most field sizes. The computational cost is independent of the number of beams used in the treatment plan.},

doi = {},

journal = {},

number = ,

volume = ,

place = {United States},

year = {2003},

month = {1}

}