Method of estimating dosimetric characteristics X-ray convergent irradiator to object to be irradiated

A method of radio treatment a patient by an X-ray convergent irradiator using a treatment plan with prescribed dose;

• utilizing data measured by said method comprising steps of
• a. estimating dosimetric characteristics provided by said X-ray convergent irradiator further comprising:
• i. providing said X-ray convergent irradiator;
• said irradiator comprising an X-ray source and a lens arrangement configured for forming an X-ray beam with a convergent envelope;
• said X-ray beam having an optical axis thereof;
• ii. positioning said X-ray irradiator above a water phantom such that a maximal dose location is located at a predetermined depth;
• iii. measuring local doses in a plurality of points within said water phantom;
• iv. obtaining a 3D isodose map of within said convergent envelope propagating in said water phantom;
• v. determining a maximal dose within said convergent envelope;
• vi. on a basis of said 3D isodose map, determining a cross-sectional diameter Dw of a focal spot formed by said convergent envelope in a plane transversally oriented to said optical axis;
• vii. on a basis of said 3D isodose map, determining a cross-sectional diameter De at zero depth in a plane transversally oriented to said optical axis;
• viii. calculating a percentage ratio of a maximal dose at zero depth to a maximal dose within said focal spot Rem=Dose at zero depth/maximum dose at the focus spot;
• ix. calculating a convergence angle given as
• arctan α=((De-Dy)/2L)
• where De and Dw are cross-sectional diameters of said convergent envelope at said zero depth and said focal spot and L is a distance between said zero depth and focal spot;
• and
• x. determining a longitudinal size of said focal spot;
• b. on a basis of the obtained percentage ratio, convergence angle and longitudinal size of focal spot, estimating the dose to be provided to said patient;
• and
• c. irradiating said target with said estimated dose.