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放射治疗中门户图像质量参数的验证。

Verification of quality parameters for portal images in radiotherapy.

机构信息

Uzsoki Hospital, Municipal Centre for Oncoradiology, Budapest, Hungary.

出版信息

Radiol Oncol. 2011 Mar;45(1):68-74. doi: 10.2478/v10019-010-0052-6. Epub 2010 Dec 31.

DOI:10.2478/v10019-010-0052-6
PMID:22933938
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3423718/
Abstract

BACKGROUND

The purpose of the study was to verify different values of quality parameters of portal images in radiotherapy.

MATERIALS AND METHODS

We investigated image qualities of different field verification systems. Four EPIDs (Siemens OptiVue500aSi(®), Siemens BeamView Plus(®), Elekta iView(®) and Varian PortalVision™) were investigated with the PTW EPID QC PHANTOM(®) and compared with two portal film systems (Kodak X-OMAT(®) cassette with Kodak X-OMAT V(®) film and Kodak EC-L Lightweight(®) cassette with Kodak Portal Localisation ReadyPack(®) film).

RESULTS

A comparison of the f50 and f25 values of the modulation transfer functions (MTFs) belonging to each of the systems revealed that the amorphous silicon EPIDs provided a slightly better high contrast resolution than the Kodak Portal Localisation ReadyPack(®) film with the EC-L Lightweight(®) cassette. The Kodak X-OMAT V(®) film gave a poor low contrast resolution: from the existing 27 holes only 9 were detectable.

CONCLUSIONS

On the base of physical characteristics, measured in this work, the authors suggest the use of amorphous-silicon EPIDs producing the best image quality. Parameters of the EPIDs with scanning liquid ionisation chamber (SLIC) were very stable. The disadvantage of older versions of EPIDs like SLIC and VEPID is a poor DICOM implementation, and the modulation transfer function (MTF) values (f50 and f25) are less than that of aSi detectors.

摘要

背景

本研究旨在验证放疗中门控图像质量参数的不同值。

材料与方法

我们研究了不同的场验证系统的图像质量。使用 PTW EPID QC PHANTOM（®）对四个 EPID（西门子 OptiVue500aSi（®）、西门子 BeamView Plus（®）、Elekta iView（®）和瓦里安 PortalVision™）进行了调查，并与两种门控胶片系统（柯达 X-OMAT（®）盒带加柯达 X-OMAT V（®）胶片和柯达 EC-L 轻便（®）盒带加柯达 Portal Localisation ReadyPack（®）胶片）进行了比较。

结果

对属于每个系统的调制传递函数（MTF）的 f50 和 f25 值进行比较，发现非晶硅 EPID 比带有 EC-L 轻便（®）盒带的柯达 Portal Localisation ReadyPack（®）胶片提供了略好的高对比度分辨率。柯达 X-OMAT V（®）胶片的低对比度分辨率较差：现有的 27 个孔中只有 9 个可检测到。

结论

根据本工作中测量的物理特性，作者建议使用产生最佳图像质量的非晶硅 EPID。带有扫描液体电离室（SLIC）的 EPID 参数非常稳定。像 SLIC 和 VEPID 这样的旧版本 EPID 的缺点是 DICOM 实现不佳，调制传递函数（MTF）值（f50 和 f25）低于 aSi 探测器。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f907/3423718/56f09cded86d/rado-45-01-68f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f907/3423718/51a68432dbdd/rado-45-01-68f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f907/3423718/cbe9f9998fcf/rado-45-01-68f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f907/3423718/8da77d5e9621/rado-45-01-68f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f907/3423718/f24089a2d7aa/rado-45-01-68f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f907/3423718/63af58af2719/rado-45-01-68f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f907/3423718/56f09cded86d/rado-45-01-68f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f907/3423718/51a68432dbdd/rado-45-01-68f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f907/3423718/cbe9f9998fcf/rado-45-01-68f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f907/3423718/8da77d5e9621/rado-45-01-68f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f907/3423718/f24089a2d7aa/rado-45-01-68f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f907/3423718/63af58af2719/rado-45-01-68f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f907/3423718/56f09cded86d/rado-45-01-68f6.jpg

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