Method for calculating an optimal arc angle of dynamic arc radiotherapy by volume-based algorithms
AssigneeNational Yang-Ming University
InventorsTung-Hsin Wu, Pei-Wei Shueng, Chen-Xiong Hsu, Jing-Yi Sun, Kuan-Heng Lin
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Abstract
This invention provides a method applied for the new dynamic arc radiotherapy treatment planning to calculate an optimal arc angle. With this invention, an operator without rich experience is able to reach the expected low dose in lungs easily and quickly. This invention can not only estimate the distribution of low radiation dose in lungs but also reduce the shortcomings like consumption of time and inaccuracy caused by manual trial and error.
Claims12
A method for rapidly calculating an optimal arc angle of a computer radiation treatment plan for an intrathoracic cancer receiving volumetric modulated arc therapy, comprising:
- substituting a value set comprising a thoracic transverse diameter, a transverse diameter of a radiotherapy planning target volume and a longitudinal length of the radiotherapy planning target volume in a medical image including a thoracic cavity into a restricted volume radius algorithm to calculate a radius of a first unilateral restricted volume and a radius of a second unilateral restricted volume;
- substituting the radius of the first unilateral restricted volume, the radius of the second unilateral restricted volume and a desired value of low radiation dose (5 Gy) in lungs V5 into a restricted volume algorithm to obtain the first unilateral restricted volume;
- substituting the radius of the first unilateral restricted volume, the radius of the second unilateral restricted volume and the desired value of low radiation dose (5 Gy) in lungs V5 into the restricted volume algorithm to obtain the second unilateral restricted volume;
- substituting the first unilateral restricted volume and the second unilateral restricted volume into a volume-based algorithm respectively to obtain a first unilateral restricted angle and a second unilateral restricted angle;
- and
- subtracting the first unilateral restricted angle and the second unilateral restricted angle from 360 degrees leaves the optimal arc angle.
Dependencies are inferred from the claim text.