|
KMID : 1164220160280020087
|
|
Journal of Korean Society for Radiotherapeutic Technology
2016 Volume.28 No. 2 p.87 ~ p.99
|
|
|
Evaluation of useful treatment which uses dual-energy when curing lung-cancer patient with stereotactic body radiation therapy
|
|
Jang Hyeong-Jun
Lee Young-Kyu
Kim Young-Jae
Park Yeong-Gyu
|
|
|
Abstract
|
|
|
Purpose : This study will evaluate the clinical utility by applying clinical schematic that uses monoenergy or dual energy as according to the location of tumors to the stereotactic radiotherapy to compare the change in actual dose given to the real tumor and the dose that locates adjacent to the tumor.
Materials and Methods : CT images from a total of 10 patients were obtained and the clinical planning were planned based
on the volumetric modulated arc therapy on monoenergy and dual energy. To analyze the change factor in the tumor,
Comformity Index(CI) and Homogeneity Index(HI) and maximum dose quantity were each calculated and comparing the dose distribution on normal tissues, V10 and V5, first ~ fourth ribs closest to the tumor (1st ~ 4th Rib), Spinal Cord, Esophagus and Trachea were selected. Also, in order to confirm the accuracy on which the planned dose distribution is really measured, the 2-dimensional ion chamber array was used to measure the dose distribution.
Results : As of the tumor factor, CI and HI showed a number close to 1 when the two energies were used. As of the maximum dose, the front chest wall showed 2% and the dorsal tumor showed equivalent value. As of normal tissue, the front chest wall tumors were reduced by 4%, 5% when both energies were used in the adjacent rib and as of trachea, reduced by 11%, 17%. As of the dose in the lung, as of V10, it reduced by 1.5%, V5 by 1%. As of the rear chest wall, when both energies were used, the ribs adjacent to the tumors showed 6%, 1%, 4%, 12% reduction, and in the lung dose distribution, V10 reduced by 3%, and V5 reduced by 3.1%. The dose measurement in all energies were in accordance to the results of Gamma Index 3mm/3%.
Conclusion : It is considered that rather than using monoenergy, utilizing double energy in the clinical setting can be more
effectively applied to the superficial tumors.
|
|
|
KEYWORD
|
|
|
Stereotatic radiotherapy(SBRT) , volumetric modulated arc therapy(VMAT) , Lung cancer , Dual energy
|
|
|
FullTexts / Linksout information
|
|
|
|
|
Listed journal information
|
|
|
|
|