Die body for quality control of CT simulation positioning machine

Abstract

The invention provides a die body for quality control of a CT simulation positioning machine, the die body is an epoxy resin tissue equivalent material die body, and the interior of the die body comprises a CT value calibration module layer with a semicircular cross section, a spatial resolution module layer and a low-contrast resolution module layer; a plurality of die holes with circular sections are formed in the CT value calibration module layer, and materials with different tissue densities are poured into the die holes; the spatial resolution module layer is uniform in tissue density, and is provided with a plurality of groups of different line pairs along an arc; a plurality of round holes with different diameters are respectively formed in the low-contrast resolution module layer along the anticlockwise direction, and two low-tissue-density materials are respectively poured into the round holes; horizontal and vertical reference grooves are formed in the outer surface of the mold body. The three module layers of the die body can be used for detecting a CT value, spatial resolution, tissue density resolution, spatial deformation, uniformity and the like. According to the invention, the die body reference groove can realize calibration of laser lamp precision, image center position, inclination angle of a treatment bed and bed entering precision of a CT analog machine.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a phantom used for quality control of a CT simulation positioning machine. Background technique [0002] With the application of computers and the development of medical imaging, radiation therapy for tumors has entered the era of "precise positioning, precise planning, and precise treatment". The development of three-dimensional conformal radiation therapy (3D Intensity Conformal Radiation Therapy, 3DCRT), especially three-dimensional intensity modulated radiation therapy (Intensity modulated radiation therapy, IMRT) has been more and more widely used, and the quality of radiation therapy has been greatly improved. Subsequently, Rapid ARC was widely used in body stereotactic radiotherapy (SBRT) and head stereotactic radiotherapy (SRS), and radiotherapy technology entered a new era. [0003] In three-dimensional intensity-modulated radiation therapy, the dose distributio...

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Problems solved by technology

[0005] In order to overcome the technical problem that the CT value obtained by scanning the CT simulation positioning machine in the prior art is not accurate enough due to the influence of many factors, and then affects the position deviation of the tumor target area, the present invention provides a method for CT simulation positioning machine QC phantom

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