Tissue equivalent replenisher for radiotherapy and preparation method thereof

Abstract

The invention relates to a tissue equivalent replenisher for radiotherapy and a preparation method thereof. The preparation method comprises: a doctor determines a skin part needing tissue equivalent replenisher customization according to a range needing radiotherapy of a patient; the doctor uses a CT scanner to scan the skin part, obtains a CT image, and transmits the CT image to a work station; the work station constructs a three-dimensional contour model of the skin part based on the CT image, generates a data file, and sends the data file to a 3D printer; the doctor determines the tissue equivalent replenisher thickness based on a dosage requirement of the radiotherapy for the patient and inputs the thickness value into the 3D printer; and the 3D printer receives the data file and the e thickness value in of the tissue equivalent replenisher and selects materials for printing and preparation, thereby obtaining the tissue equivalent replenisher. According to the method, no gap is formed between the tissue equivalent replenisher and the skin of the human body based on individual customization; and thus the injury of the skin due to a secondary building effect caused by a high-energy ray in the gap during a radiotherapeutic process can be reduced.

Description

Technical field [0001] The invention relates to the preparation of a radiotherapy tissue equivalent compensator, in particular to a radiotherapy tissue equivalent compensator based on 3D printing technology and a preparation method thereof. Background technique [0002] The rapid development of modern radiotherapy technology has been widely used clinically. Radiotherapy uses high-energy X-rays, and after high-energy rays enter the human body, there is a dose built-up area, and the dose after the built-up area is the actual dose that acts on the human body. Since one of the characteristics of the depth dose distribution of different energy rays is that the surface dose decreases as the ray energy increases, the maximum dose point depth and the percentage depth dose (maximum dose point) increase, and the depth from the surface to the maximum dose point is the dose built-up area. This feature causes the superficial target area dose to fail to reach the expected dose when superficia...

AI Technical Summary

Problems solved by technology

One of the depth dose distribution characteristics of different energy rays is that the surface dose decreases with the increase of the ray energy, and the depth of the maximum dose point and the percentage depth dose (maximum dose point) increase. The depth from the surface to the maximum dose point is the dose built-up area, because This characteristic leads to the superficial target dose not reaching the expected dose when intensity-modulated radiation is applied to superficial tumors

For this reason, compensation membranes are often used in clinical radiotherapy to increase the dose in the superficial area of ​​​​the tumor, but the default compensation membrane in the general planning system is close to the skin, but the compensation membrane used in actual treatment has a certain hardness, so it cannot be close to the skin. There are even gaps in some places, resulting in uncertainty between the actual dose received by the superficial tumor target area and the tumor dose received in the planning system during actual treatment

[0003] At present, conventional compensators are mainly made of wax blocks or formed compensating films. These two compensators cover the human body with different equivalent thicknesses, some thick and some thin, and cannot be well adhered to the curved surface of the human body. And there is a gap between the compensator and the human skin, and the high-energy rays will produce a secondary construction effect in the gap, which will aggravate skin damage

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