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评估沿边缘放置的 PTW microDiamond 在小射野中的剂量学性能。

Evaluation of the PTW microDiamond in edge-on orientation for dosimetry in small fields.

机构信息

Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW, Australia.

Australian Radiation Protection and Nuclear Safety Agency (ARPANSA), Yallambie, VIC, UK.

出版信息

J Appl Clin Med Phys. 2020 Aug;21(8):278-288. doi: 10.1002/acm2.12906. Epub 2020 May 22.

DOI:10.1002/acm2.12906
PMID:32441884
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7484886/
Abstract

PURPOSE

The PTW microDiamond has an enhanced spatial resolution when operated in an edge-on orientation but is not typically utilized in this orientation due to the specifications of the IAEA TRS-483 code of practice for small field dosimetry. In this work the suitability of an edge-on orientation and advantages over the recommended face-on orientation will be presented.

METHODS

The PTW microDiamond in both orientations was compared on a Varian TrueBeam linac for: machine output factor (OF), percentage depth dose (PDD), and beam profile measurements from 10 × 10 cm to a 0.5 × 0.5 cm field size for 6X and 6FFF beam energies in a water tank. A quantification of the stem effect was performed in edge-on orientation along with tissue to phantom ratio (TPR) measurements. An extensive angular dependence study for the two orientations was also undertaken within two custom PMMA plastic cylindrical phantoms.

RESULTS

The OF of the PTW microDiamond in both orientations agrees within 1% down to the 2 × 2 cm field size. The edge-on orientation overresponds in the build-up region but provides improved penumbra and has a maximum observed stem effect of 1%. In the edge-on orientation there is an angular independent response with a maximum of 2% variation down to a 2 × 2 cm field. The PTW microDiamond in edge-on orientation for TPR measurements agreed to the CC01 ionization chamber within 1% for all field sizes.

CONCLUSIONS

The microDiamond was shown to be suitable for small field dosimetry when operated in edge-on orientation. When edge-on, a significantly reduced angular dependence is observed with no significant stem effect, making it a more versatile QA instrument for rotational delivery techniques.

摘要

目的

当 PTW 微棱柱状探测器以边缘朝向方式操作时，其空间分辨率会提高，但由于国际原子能机构 TRS-483 实践规程中对小射野剂量学的规定，通常不会以这种方式使用。本工作将介绍边缘朝向方式的适用性和相对于推荐的面向朝向方式的优势。

方法

在瓦里安 TrueBeam 直线加速器上，分别在两种方向上对 PTW 微棱柱状探测器进行比较：机器输出因子（OF）、百分深度剂量（PDD）以及从 10×10cm 到 0.5×0.5cm 的射野大小的射束轮廓测量，用于 6X 和 6FFF 射束能量，在水箱中。在边缘朝向方向上进行了茎效应的定量分析，并进行了组织与模体比（TPR）的测量。还在两个定制的 PMMA 塑料圆柱体模体中进行了两种方向的广泛角依赖性研究。

结果

两种方向上的 PTW 微棱柱状探测器的 OF 在 2×2cm 射野大小以下一致，误差在 1%以内。边缘朝向方向在建成区过度响应，但提供了更好的半影，最大观察到的茎效应为 1%。在边缘朝向方向上，存在角度独立响应，在 2×2cm 射野大小下最大变化为 2%。在边缘朝向方向上，对于 TPR 测量，PTW 微棱柱状探测器与 CC01 电离室的一致性在所有射野大小下均在 1%以内。

结论

当以边缘朝向方式操作时，微棱柱状探测器适用于小射野剂量学。当采用边缘朝向方式时，观察到角度依赖性显著降低，且没有显著的茎效应，这使其成为旋转递送技术更通用的 QA 仪器。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a858/7484886/268539d7eb1e/ACM2-21-278-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a858/7484886/8c5f3386c5c6/ACM2-21-278-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a858/7484886/f7c13f02a03f/ACM2-21-278-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a858/7484886/b6bd975e0766/ACM2-21-278-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a858/7484886/b340040c66d9/ACM2-21-278-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a858/7484886/393b4c29abf3/ACM2-21-278-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a858/7484886/b14583bae6c1/ACM2-21-278-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a858/7484886/fa1e7772134f/ACM2-21-278-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a858/7484886/efec1179cfe1/ACM2-21-278-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a858/7484886/268539d7eb1e/ACM2-21-278-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a858/7484886/8c5f3386c5c6/ACM2-21-278-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a858/7484886/f7c13f02a03f/ACM2-21-278-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a858/7484886/b6bd975e0766/ACM2-21-278-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a858/7484886/b340040c66d9/ACM2-21-278-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a858/7484886/393b4c29abf3/ACM2-21-278-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a858/7484886/b14583bae6c1/ACM2-21-278-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a858/7484886/fa1e7772134f/ACM2-21-278-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a858/7484886/efec1179cfe1/ACM2-21-278-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a858/7484886/268539d7eb1e/ACM2-21-278-g009.jpg

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