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Investigations of different kilovoltage x‐ray energy for three‐dimensional converging stereotactic radiotherapy system: Monte Carlo simulations with CT data
Author(s) -
Deloar Hossain M.,
Kunieda Etsuo,
Kawase Takatsugu,
Tsunoo Takanori,
Saitoh Hidetoshi,
Ozaki Masahiro,
Saito Kimiaki,
Takagi Shunji,
Sato Osamu,
Fujisaki Tatsuya,
Myojoyama Atsushi,
Sorell Graham
Publication year - 2006
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.2361080
Subject(s) - imaging phantom , monte carlo method , nuclear medicine , dosimetry , homogeneity (statistics) , dose profile , physics , radiation treatment planning , percentage depth dose curve , materials science , radiation therapy , medicine , ionization chamber , mathematics , radiology , statistics , ion , quantum mechanics , ionization
We are investigating three‐dimensional converging stereotactic radiotherapy (3DCSRT) with suitable medium‐energy x rays as treatment for small lung tumors with better dose homogeneity at the target. A computed tomography (CT) system dedicated for non‐coplanar converging radiotherapy was simulated with BEAMnrc (EGS4) Monte‐Carlo code for x‐ray energy of 147.5, 200, 300, and 500 kilovoltage (kVp). The system was validated by comparing calculated and measured percentage of depth dose in a water phantom for the energy of 120 and 147.5 kVp . A thorax phantom and CT data from lung tumors ( < 20cm 3 ) were used to compare dose homogeneities of kVp energies with MV energies of 4, 6, and 10 MV . Three non‐coplanar arcs ( 0 ° and ± 25 ° ) around the center of the target were employed. The Monte Carlo dose data format was converted to the XiO RTP format to compare dose homogeneity, differential, and integral dose volume histograms of kVp and MV energies. In terms of dose homogeneity and DVHs, dose distributions at the target of all kVp energies with the thorax phantom were better than MV energies, with mean dose absorption at the ribs (human data) of 100%, 85%, 50%, 30% for 147.5, 200, 300, and 500 kVp , respectively. Considering dose distributions and reduction of the enhanced dose absorption at the ribs, a minimum of 500 kVp is suitable for the lung kVp 3DCSRT system.