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为钴远距离治疗机设计的改装型多叶准直器皮肤剂量的估算

Estimation of Skin doses for Retrofit Prototype Multileaf Collimators Designed for Telecobalt Therapy Machine.

作者信息

Rani Akula Roopa, Ayyangar Komanduri, Reddy A R, Kumar Ayyalasomayajula Anil, Reddy Pal Reddy Yadagiri

机构信息

Department of Physics, Osmania University, Hyderabad, Telangana, India.

Department of Radiation Oncology, MNJ Institute of Oncology and Regional Cancer Center, Hyderabad, Telangana, India.

出版信息

J Med Phys. 2020 Oct-Dec;45(4):215-220. doi: 10.4103/jmp.JMP_25_20. Epub 2021 Feb 2.

DOI:10.4103/jmp.JMP_25_20
PMID:33953496
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8074722/
Abstract

AIM

The objective of this study was to evaluate skin dose based on retrofit prototype multileaf collimators (MLCs), designed for cobalt-60 teletherapy machine. Since patient's skin is sensitive to radiation, evaluation of skin dose is of utmost importance for investigating the risk of late effects.

MATERIALS AND METHODS

Measurements were performed with a Phoenix cobalt-60 teletherapy machine and the detector used was EBT3 radiochromic film. The experiments were performed in a solid water phantom with two prototype MLCs mounted to the machine. Dose readings were taken by placing the films at source-to-surface distance (SSD) of 60 cm, 65 cm, 70 cm, 75 cm, 80 cm, 85 cm, and 90 cm for various MLC-generated field sizes starting from 2 cm × 2 cm to 14 cm × 14 cm. The films were analyzed using custom made programs. The measured doses were normalized to the dose at dmax for that particular measurement of SSD.

RESULTS

The skin dose is expressed as a percentage of dose at dose maximum. In general, the skin dose increases with field size and decreases with SSD. The measurements indicate surface doses within 20%-60% for the investigated SSD range. Furthermore, there is no significant difference between the surface doses of two prototype MLCs studied.

CONCLUSIONS

From the measurements, it can be concluded that there is good skin sparing even at close distance to the MLCs. The skin dose is <50% for SSDs >65 cm. A minimum gap of 5 cm is required to produce acceptable skin dose.

摘要

目的

本研究的目的是基于为钴 - 60远距离治疗机设计的改装原型多叶准直器（MLC）评估皮肤剂量。由于患者皮肤对辐射敏感，评估皮肤剂量对于调查晚期效应风险至关重要。

材料与方法

使用凤凰钴 - 60远距离治疗机进行测量，所使用的探测器为EBT3放射变色胶片。实验在固体水模体中进行，将两个原型MLC安装到机器上。通过将胶片放置在源皮距（SSD）为60 cm、65 cm、70 cm、75 cm、80 cm、85 cm和90 cm处，针对从2 cm×2 cm到14 cm×14 cm的各种MLC产生的射野尺寸读取剂量。使用定制程序分析胶片。将测量的剂量针对该特定SSD测量的dmax处的剂量进行归一化。

结果

皮肤剂量表示为剂量最大值处剂量的百分比。一般来说，皮肤剂量随射野尺寸增加而增加，随SSD减小而减小。测量表明在所研究的SSD范围内表面剂量在20% - 60%之间。此外，所研究的两个原型MLC的表面剂量之间没有显著差异。

结论

从测量结果可以得出结论，即使在靠近MLC的距离处也有良好的皮肤保护。对于SSD > 65 cm，皮肤剂量<50%。需要至少5 cm的间隙才能产生可接受的皮肤剂量。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c81e/8074722/b9fa446d0443/JMP-45-215-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c81e/8074722/37beace65a7c/JMP-45-215-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c81e/8074722/3463e537795f/JMP-45-215-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c81e/8074722/c91284431940/JMP-45-215-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c81e/8074722/1926b12dee1f/JMP-45-215-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c81e/8074722/b9fa446d0443/JMP-45-215-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c81e/8074722/37beace65a7c/JMP-45-215-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c81e/8074722/3463e537795f/JMP-45-215-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c81e/8074722/c91284431940/JMP-45-215-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c81e/8074722/1926b12dee1f/JMP-45-215-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c81e/8074722/b9fa446d0443/JMP-45-215-g005.jpg

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