使用具有时间读出功能的铅笔电离室来测量 CT 光束全宽半最大值。

Medical physics Pub Date : 2024-07-01 Epub Date: 2024-05-17 DOI:10.1002/mp.17084
Muhannad N Fadhel, Kevin Grizzard, Daniel Vergara, Roberto Perez Franco, Anzi Zhao, Matthew Hoerner
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引用次数: 0

摘要

背景:由于计算机断层扫描(CT)光束宽度与患者剂量直接相关,因此认证和监管机构要求对其进行常规物理评估。目前进行 CT 光束宽度测量的方法需要特殊的硬件、软件和/或耗材胶片。目前,大多数用于评估计算机断层扫描剂量指数(CTDIvol)的带数字接口的 100 毫米铅笔室都有足够高的采样率,可以重建任何采集模式下的高分辨率剂量曲线。目的:本研究的目的是使用用于 CTDIvol 测量的 100 毫米铅笔室,根据单螺旋采集下的采样剂量曲线测量 CT 波束宽度:方法:使用放置在等中心并与患者台共同移动的 100 毫米铅笔室,测量不同扫描仪在不同准直设置下的螺旋扫描剂量曲线。通过提取周期校正函数(PCF)对 100 毫米铅笔室测量的剂量曲线进行台面衰减校正,以消除台面干扰。然后将校正后的剂量剖面与腔体的响应函数进行解卷积,计算出光束剖面。光束宽度由所得光束轮廓的全宽半最大值(FWHM)定义。此外,还使用 Gafchromic 胶片测量了参考剂量曲线,以进行比较:结果:使用创新的解卷积方法从 100 毫米铅笔室估算出的光束宽度,与通过 Gafchromic 胶片获得的光束宽度评估测量值相比,平均百分比差异为 1.6 ± 1.8:建议的铅笔室响应解卷积方法证明了无需特殊硬件、软件或耗材胶片即可获得高精度 CT 波束宽度的潜力。这项技术可以改善 CT 系统常规性能评估的工作流程。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The use of pencil ionization chamber with temporal readout capabilities to measure CT beam full width half maximum.

Background: Measurement of Computed Tomography (CT) beam width is required by accrediting and regulating bodies for routine physics evaluations due to its direct correlation to patient dose. Current methods for performing CT beam width measurement require special hardware, software, and/or consumable films. Today, most 100-mm pencil chambers with a digital interface used to evaluate Computed Tomography Dose Index (CTDIvol) have a sufficiently high sampling rate to reconstruct a high-resolution dose profile for any acquisition mode.

Purpose: The goal of this study is to measure the CT beam width from the sampled dose profile under a single helical acquisition with the 100-mm pencil chamber used for CTDIvol measurements.

Methods: The dose profiles for different scanners were measured for helical scans with varying collimation settings using a 100-mm pencil chamber placed at the isocenter and co-moving with the patient table. The measured dose profiles from the 100-mm pencil chamber were corrected for table attenuation by extracting a periodic correction function (PCF) to eliminate table interference. The corrected dose profiles were then deconvolved with the response function of the chamber to compute the beam profile. The beam width was defined by the full width half maximum (FWHM) of the resulting beam profile. Reference dose profiles were also measured using Gafchromic film for comparison.

Results: The beam widths, estimated using the innovative deconvolution method from the 100-mm pencil chamber, exhibit an average percentage difference of 1.6 ± 1.8 when compared with measurements obtained through Gafchromic film for beam width assessment.

Conclusion: The proposed approach to deconvolve the pencil chamber response demonstrates the potential of obtaining the CT beam width at high accuracy without the need of special hardware, software, or consumable films. This technique can improve workflow for routine performance evaluation of CT systems.

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