Verification method of monitor units and fluence map in intensity modulated radiation therapy

A computer-implemented method for an independent dose calculation in a treatment field in intensity modulated radiation therapy, comprising the steps of:

• (a) providing multileaf collimator leaf sequences for generating said treatment field wherein said treatment field comprises M beamlets;
• (b) calculating said dose by a summation of contributions of said M beamlets wherein each of said M beamlets is modulated by a dynamic modulation factor calculated for each of said M beamlets;
• and
• (c) comparing said calculated dose with a theoretical dose predicted by a treatment planning system.

A program storage device accessible by a computer, tangibly embodying a program of instructions executable by said computer to perform method steps for an independent dose calculation in a treatment field in intensity modulated radiation therapy, said methods steps comprising:

• (a) providing multileaf collimator leaf sequences for generating said treatment field wherein said treatment field comprises M beamlets;
• (b) calculating said dose by a summation of contributions of said M beamlets wherein each of said M beamlets is modulated by a dynamic modulation factor calculated for each of said M beamlets;
• and
• (c) comparing said calculated dose with a theoretical dose predicted by a treatment planning system.

A computer-implemented method for verification of a dose in a low dose region in a treatment field in intensity modulated radiation therapy, comprising the steps of:

• (a) providing said multileaf collimator leaf sequences for generating said treatment field;
• (b) providing a fluence map of said treatment field;
• (c) determining an inverted field of said fluence map;
• (d) calculating said dose of said inverted field;
• (e) determining a dose difference between said calculated dose and a theoretical dose;
• (f) normalizing said dose difference with a theoretical dose or said calculated dose;
• and
• (g) verifying said normalized dose with a criterion.

A program storage device accessible by a computer, tangibly embodying a program of instructions executable by said computer to perform method steps for verification of a dose in a low dose region in a treatment field in intensity modulated radiation therapy, said methods steps comprising:

• (a) providing said multileaf collimator leaf sequences for generating said treatment field;
• (b) providing a fluence map of said treatment field;
• (c) determining an inverted field of said fluence map;
• (d) calculating said dose of said inverted field;
• (e) determining a dose difference between said calculated dose and a theoretical dose;
• (f) normalizing said dose difference with a theoretical dose or said calculated dose;
• and
• (g) verifying said normalized dose with a criterion.

A computer-implemented method for verifying a fluence map in a treatment field for intensity modulated radiation therapy, comprising the steps of:

• (a) providing said treatment field wherein said treatment field comprises M beamlets;
• (b) calculating a dynamic modulation factor for each of said M beamlets;
• (c) calculating said fluence map wherein said fluence map is calculated by dividing each of said dynamic modulation factors by the maximum of all said dynamic modulation factors;
• and
• (d) comparing said calculated fluence map with a theoretical fluence map, and verifying said comparison with a criterion.

A program storage device accessible by a computer, tangibly embodying a program of instructions executable by said computer to perform method steps of verifying a fluence map in a treatment field for intensity modulated radiation therapy, said methods steps comprising:

• (a) providing said treatment field wherein said treatment field comprises M beamlets;
• (b) calculating a dynamic modulation factor for each of said M beamlets;
• (c) calculating said fluence map wherein said fluence map is calculated by dividing each of said dynamic modulation factors by the maximum of all said dynamic modulation factors;
• and
• (d) comparing said calculated fluence map with a theoretical fluence map, and verifying said comparison with a criterion.