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首页> 外文期刊>Medical Physics >Determination of dose-area product from panoramic radiography using a pencil ionization chamber: normalized data for the estimation of patient effective and organ doses.
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Determination of dose-area product from panoramic radiography using a pencil ionization chamber: normalized data for the estimation of patient effective and organ doses.

机译：使用铅笔电离室通过全景射线照相确定剂量面积乘积：用于估计患者有效剂量和器官剂量的归一化数据。

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摘要

The aims of the present study were (a) to investigate the potential of pencil ionization chamber to be used for the determination of dose-width product (DWP) and dose-area product (DAP) from panoramic radiographic exposures and (b) to provide data normalized to DAP for the determination of patient effective and gonadal dose from panoramic radiography performed in any laboratory. A pencil ionization chamber commonly used to measure CT dose index (CTDI) in CT scanners was employed to determine DWP for various combinations of panoramic exposure settings at the beam exit slit of a Cranex Tome panoramic x-ray unit (Soredex, Helsinki, Finland). DWP values were also measured using an array of thermoluminescence dosimeters. Reproducibility of the DWP measurement was tested. The effect of milliamperage and kilovoltage of panoramic exposures on DWP was investigated. DAP was estimated using the value of DWP measured using the pencil ionization chamber and the beam exit slit length measured using dosimetric film attached on the beam exit slit. A Rando anthropomorphic phantom appropriately loaded with thermoluminescent dosimeters (TLDs) was used to obtain organ dose and effective dose values from panoramic radiography. Reproducibility of DWP determination using the proposed method was better than 1.5%. DWP was found to be linearly related to milliamperage (r>0.999, p<0.001) and to kilovoltage raised in a power ranging from 2.18 to 2.55. DWP measured using the pencil chamber was found to be up to 11% higher than the corresponding values determined using TLD array. The panoramic exposure obtained with settings appropriate for the typical adult patient was found to result in 0.008 mSv patient effective dose, 0.0002 mGy gonadal dose, and 11.3 cGy cm2 DAP. The use of a pencil ionization chamber is proposed for the determination of DWP and DAP from panoramic radiographic exposures. Normalized data over DAP were provided for the determination of patient effective and gonadal dose from panoramic radiography.
机译：本研究的目的是（a）研究铅笔电离室用于从全景X射线曝光确定剂量宽度乘积（DWP）和剂量面积乘积（DAP）的潜力，以及（b）提供将数据标准化为DAP，以在任何实验室中通过全景射线照相确定患者的有效剂量和性腺剂量。使用通常用于测量CT扫描仪中CT剂量指数（CTDI）的铅笔电离室来确定Cranex Tome全景X射线装置（Soredex，赫尔辛基，芬兰）的出射狭缝处全景曝光设置的各种组合的DWP 。还使用热致发光剂量计阵列测量了DWP值。测试了DWP测量的可重复性。研究了全景曝光的毫安和千伏对DWP的影响。使用铅笔电离室测得的DWP值和使用附着在光束出口狭缝上的剂量膜测量的光束出口狭缝长度来估算DAP。适当加载热发光剂量计（TLD）的Rando拟人幻影用于从全景X射线照相术获得器官剂量和有效剂量值。使用所提出的方法测定DWP的重现性优于1.5％。发现DWP与毫安（r> 0.999，p <0.001）和以2.18至2.55的幂升高的千伏电压线性相关。发现使用笔形室测得的DWP比使用TLD阵列确定的相应值高11％。发现采用适合典型成年患者的设置获得的全景曝光可产生0.008 mSv的患者有效剂量，0.0002 mGy的性腺剂量和11.3 cGy cm2的DAP。建议使用铅笔电离室从全景射线照相曝光确定DWP和DAP。提供了DAP上的标准化数据，用于从全景X射线照相术确定患者的有效剂量和性腺剂量。

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