New High Resolution Portal Shaping System

Abstract

The invention relates to a novel high-resolution portal imaging system, belongs to the field of medical instruments, and is applied to tumor radiotherapy. The novel high-resolution portal imaging system comprises a multi-blade collimator comprising multiple blades which are installed in a box body. The box body is installed on a slide block of a linear guide rail and can move along the linear guide rail. Each blade can move along blade guide grooves of the box body. The box body moves in a dragging way via a leading screw transmission mechanism. The blades move in the dragging way via leading screw nuts. A required portal shape is formed by positions of the multiple blades and the box body via positioning and controlling, and dimension of a dose calculation matrix unit of the portal imaging system is 2.5mm*2.5mm. The novel high-resolution portal imaging system is characterized in that the blades comprise a group of intermediate blades, a second group of blades and a third group of blades. The second group of blades are arranged at the two sides of the group of intermediate blades. The third group of blades are arranged at the two sides of the second group of blades. The novel high-resolution portal imaging system has characteristics of being high in performance, low in cost and high in practicality.

Description

technical field [0001] The invention relates to a novel high-resolution radiation field shaping system, which belongs to the field of medical equipment and is used for radiation therapy of tumors. Background technique [0002] The radiation fields produced by conventional medical accelerators are square or rectangular, but the shapes of tumors vary widely. In order to better protect the normal tissues around the tumor, in the early clinical stage, blocks with consistent hole shapes were made according to the shape of the tumor for beam shaping. This method is time-consuming and labor-intensive, and the stoppers made by casting are not fine enough. Its advantage is that the investment in disposable equipment is small, and stoppers of any shape can be manufactured. At present, the clinically used beam forming equipment for tumor radiotherapy is mainly a multi-leaf collimator. The multi-leaf collimator is composed of many heavy metal sheets. The shape of the beam hole and the ...

AI Technical Summary

Problems solved by technology

[0004] The resolution of the existing 40-pair multi-leaf collimator is the most common 10mm, and the cost is low, but the resolution is relatively low for the treatment of small tumors; the 60-pair multi-leaf collimator has improved resolution in the middle area, but The 5mm resolution corresponds to an irradiation area of ​​only 200mm at the isocenter. Usually, the target areas of nasopharyngeal cancer and cervical cancer are larger than 200mm, and the resolution gap between the middle and outer leaves is too large; 80 pairs of multi-leaf collimators, all area resolution Increased, but both cost and failure rate increased

There are also multi-leaf collimators on the market whose leaf thickness does not match the accelerator installation position and the size of the dose calculation matrix unit. The field size and leaf thickness are relatively random, and the accuracy of the accelerator output treatment plan calculation dose is poor.

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