Sub-field information determination method and device

Abstract

The invention provides a sub-field information determination method and device. The sub-field information determination method comprises the steps of acquiring a scanning image; determining a target area and organs at risk according to the scanning image, and acquiring a first constraint value of sub-field information in allusion to the target area and organs at risk; determining a sub-field optimization algorithm with a constraint condition, wherein the constraint condition comprises a second constraint value of the sub-field information; iteratively executing the sub-field optimization algorithm, wherein the second constraint value of the sub-field information is set to be not equal to the corresponding first constraint value when the sub-field optimization algorithm is executed for thefirst time, the number of sub-fields is reduced at the completion of each time of iteration, approximation modification is performed on the second constraint value towards the direction of the first constraint value, and the next time of execution is performed by using the reduced sub-fields and the modified second constraint value; and determining sub-field information obtained by the sub-field optimization algorithm to be the obtained sub-field information when the second constraint value is modified to be equal to the first constraint value. According to the invention, the treatment time isreduced, and the treatment quality is improved.

Description

technical field [0001] The present disclosure relates to radiotherapy technology, and in particular to a method and device for determining seed field information. Background technique [0002] Radiation therapy is one of the three important means of treating cancer (surgical therapy, chemotherapy, and radiotherapy). Its principle is to use ionizing radiation generated by radiation to kill tumor cells. Intensity modulated radiation therapy (IMRT) is a type of radiation therapy, which can kill tumor cells while protecting normal cells by adjusting the intensity and shape of radiation. Before intensity-modulated radiotherapy, the doctor can determine the target area and organs at risk of this radiotherapy, and give the constrained dose of the target area and organs at risk, the maximum constraint value of the number of subfields, the minimum number of machine jumps and the maximum number of subfields. Small subfield area, etc., the treatment plan system (Treatment plan system,...

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Problems solved by technology

[0003] However, the lack of experience of doctors may lead to unreasonable constraints such as constraints on the number of subfields input according to experience. For example, suppose that some treatment plans require a relatively small number of ideal subfields (for example, 20 subfields are enough), and the doctor The maximum constraint value of the number of input subfields is very large (for example, 100). In this way, in the subfield information obtained by the treatment planning system according to the constraints input by the doctor, it is likely that the number of subfields is much more than the ideal number, not only Healing time increased and quality of treatment decreased

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