Adult chest and abdomen dose verification dynamic phantom

Abstract

The invention provides an adult chest and abdomen dose verification dynamic phantom. The phantom comprises a chest and abdomen phantom body and a motion measurement and control system; the chest and abdomen phantom body is made of a material equivalent to a material with human body CT values and comprises human muscle tissue, spinal bone tissue and lung tissue, the whole phantom body is formed bycombining slices, an EBT3 dosimetry development-free film can be clamped between every two slices, and the dose space distribution of the positions of interest is obtained through multiple films; lungmotion insertion rods are arranged in the lung tissue and comprise the simulated tumor insertion rod, the four-dimensional CT quality control insertion rod and the like; the motion measurement and control system comprises an insertion rod motion platform and a chest wall motion platform, a driving device is controlled by an upper computer and connected with the insertion rods, and corresponding action is generated to simulate 3D breathing motion and chest-wall up-down motion of the human body. The phantom can provide a research tool for radiotherapy dose distribution and dose verification inclinical research of motion organs.

Description

technical field [0001] The invention belongs to an auxiliary simulation device for medical equipment, in particular to a dose verification phantom for simulating breathing movement in radiotherapy. Background technique [0002] Radiation therapy has entered the era of high-precision radiotherapy, and its implementation techniques and processes are becoming more and more complex. The risk of dose errors faced by patients during radiotherapy is also increasing. Dose verification, as an important part of radiotherapy quality assurance, is becoming more and more important. The purpose of dose verification is to avoid underdose or uneven dose caused by erroneous irradiation of the target area, and to protect the dose received by normal tissues within the tolerance range. The current dose verification method is to perform CT scanning on static phantoms (solid water, water phantoms, and dose verification phantoms imitating the human body structure with non-uniform density) accordin...

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Problems solved by technology

Although these two phantoms can simulate 3D breathing movement, the chest dynamic phantom (Model 008A) has non-equivalent tissue materials, which makes the dose attenuation far different from that of the real human body, and the phantom can only measure limited In addition to the above disadvantages, the biggest defect of the QUASAR breathing motion phantom is that its motor load capacity is very limited. When driving the breathing sensor and motion plug-in at the same time, it often gets stuck

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