Commissioning of a GyroKnife digital 60Co system
10.3760/cma.j.issn.0254-5098.2012.03.022
- VernacularTitle:陀螺旋转式60Co伽玛刀的性能测试
- Author:
Yiguo XU
;
Zhiyong XU
;
Junchao CHEN
;
Jiandong ZHAO
;
Guiyuan CHEN
;
Dengke ZUO
;
Fan HU
- Publication Type:Journal Article
- Keywords:
Gamma knife;
GyroKnife;
Quality assurance
- From:
Chinese Journal of Radiological Medicine and Protection
2012;32(3):308-310
- CountryChina
- Language:Chinese
-
Abstract:
Objective To introduce and evaluate the characteristics of a GyroKnife Digital Cobalt-60 System for stereotactic radiotherapy and radiosurgery in mechanical aspect.Methods To test the radiation safety,the dose rate required for radiation protection was measured by using an ionization survey meter ( Inovision Model 451 B,Cleveland,OH ).Micrometer was used to verify the accuracy of the table in movement and protractor to verify the rotation movement range.The 160 mm diameter polystyrene spherical phantom and film were used in measurement of the radiation Full Width at Half Maximum.And the difference between radiation isocenter and mechanical isocenter was also verified.Results Clinical requirement in radiation protection was met.The maximum error of table movement accuracy was 0.2 cm at Z axis; the maximum error of gantry movement accuracy was 0.1°.For all the collimators,radiation Full Width at Half Maximum ( FWHM ) was 2.55,5.40,10.50,and 18.55 mm and average penumbra was 5.0,12.4,30.1,and 51.5 mm,respectively.The maximum difference between mechanical center and radiation center was 1.41 mm.Conclusions Stereotactic radiotherapy and radiosurgery has good mechanical characteristics and is suitable clinic applications.
