Calculation of 10 MV x-ray spectra emitted by a medical linear accelerator using the BFGS quasi-Newton method.

Calculation of 10 MV x-ray spectra emitted by a medical linear accelerator using the BFGS quasi-Newton method. Research Abstract Details 

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Calculation of 10 MV x-ray spectra emitted by a medical linear accelerator using the BFGS quasi-Newton method. Abstract Text:

T Shimozato,K Tabushi,S Kitoh,Y Shiota,C Hirayama,S Suzuki,

To calculate photon spectra for a 10 MV x-ray beam emitted by a medical linear accelerator, we performed numerical analysis using the aluminium transmission data obtained along the central axis of the beam under the narrow beam condition corresponding to a 3x3 cm2 field at a 100 cm distance from the source. We used the BFGS quasi-Newton method based on a general nonlinear optimization technique for the numerical analysis. The attenuation coefficients, aluminium thicknesses and measured transmission data are necessary inputs for the numerical analysis. The calculated x-ray spectrum shape was smooth in the lower to higher energy regions without any angular components. The x-ray spectrum acquired by the employed method was evaluated by comparing the measurements along the central axis percentage depth dose in a water phantom and by a Monte Carlo simulation code, the electron gamma shower code. The values of the calculated percentage depth doses for a 10x10 cm2 field at a 100 cm source-to-surface distance in a water phantom were obtained using the same geometry settings as those of the water phantom measurement. The differences in the measured and calculated values were less than +/-1.0% for a broad region from the shallow part near the surface to deep parts of up to 25 cm in the water phantom.

Calculation of 10 MV x-ray spectra emitted by a medical linear accelerator using the BFGS quasi-Newton method. Publishing Authors By Initials

T Shimozato,K Tabushi,S Kitoh,Y Shiota,C Hirayama,S Suzuki,

For similar natural sciences: physics: radiation: radiation, ionizing: x-rays research abstracts see: natural sciences: physics: radiation: radiation, ionizing: x-rays research

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Calculation of 10 MV x-ray spectra emitted by a medical linear accelerator using the BFGS quasi-Newton method. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Physics in medicine and biology

VOLUME: 52

Page Numbers: 515-23

Journal Abbreviation:

ISSN: 0031-9155

DAY: 29

MONTH: 12

YEAR: 2006

Calculation of 10 MV x-ray spectra emitted by a medical linear accelerator using the BFGS quasi-Newton method. Information

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LANGUAGE: eng

NlmUniqueID: 401220

Calculation of 10 MV x-ray spectra emitted by a medical linear accelerator using the BFGS quasi-Newton method. Keywords Mesh Terms:

KEYWORDS: X-Rays

MESH TERMS: chemistry

Chemical & Substance for Abstract: Calculation of 10 MV x-ray spectra emitted by a medical linear accelerator using the BFGS quasi-Newton method. Information

Substance Name: Water

Registry Number: 7732-18-5

Grant and Affiliation Information for Calculation of 10 MV x-ray spectra emitted by a medical linear accelerator using the BFGS quasi-Newton method.

AFFILIATION: Hamamatsu University School of Medicine, University Hospital, 1-20-1 Handayama, Hamamatsu, Shizuoka 431-3192, Japan. shimo-p@umin.ac.jp

Country: England

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MEDLINETA: Phys Med Biol

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