Image quality-based dose optimization in pediatric cone-beam computed tomography: A pilot methodological study.

IF 1.7 Q3 DENTISTRY, ORAL SURGERY & MEDICINE Imaging Science in Dentistry Pub Date : 2024-09-01 Epub Date: 2024-07-02 DOI:10.5624/isd.20240030
Hak-Sun Kim, Yoon Joo Choi, Kug Jin Jeon, Sang-Sun Han, Chena Lee
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Abstract

Purpose: This study aimed to propose a methodological approach for reducing the radiation dose in pediatric conebeam computed tomography (CBCT), focusing exclusively on balancing image quality with dose optimization.

Materials and methods: The dose-area product (DAP) for exposure was reduced using copper-plate attenuation of an X-ray source. The thickness of copper (Cu) was increased from 0 to 2.2 mm, and 10 different DAP levels were used. The QUART DVT_AP phantom and pediatric radiologic dentiform were scanned under the respective DAP levels. The contrast-to-noise ratio (CNR), image homogeneity, and modulation transfer function (MTF) were analyzed using the QUART DVT_AP phantom. An expert evaluation (overall image grade, appropriateness of field of view, artifacts, noise, and resolution) was conducted using pediatric dentiform images. The critical DAP level was determined based on phantom and dentiform analysis results.

Results: CNR and image homogeneity decreased as the DAP was reduced; however, there was an inflection point of image homogeneity at Cu 1.6 mm (DAP=138.00 mGy·cm2), where the value started increasing. The MTF showed constant values as the DAP decreased. The expert evaluation of overall image grades showed "no diagnostic value" for dentiform images with Cu 1.9-2.2 mm (DAP=78.00-103.33 mGy·cm2). The images with Cu 0-1.6 mm (DAP=138.00-1697.67 mGy·cm2) had a "good," "moderate," or "poor but interpretable" grade.

Conclusion: Reducing DAP beyond a 1.6-mm Cu thickness degraded CBCT image quality. Image homogeneity and clinical image grades indicated crucial decision points for DAP reduction in pediatric CBCT scans.

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基于图像质量的儿科锥形束计算机断层扫描剂量优化:方法学试验研究。
目的:本研究旨在提出一种减少小儿锥束计算机断层扫描(CBCT)辐射剂量的方法,重点是平衡图像质量和剂量优化:利用 X 射线源的铜板衰减来减少曝光的剂量-面积乘积(DAP)。铜(Cu)的厚度从 0 毫米增加到 2.2 毫米,使用了 10 种不同的 DAP 水平。在相应的 DAP 水平下对 QUART DVT_AP 模型和儿科放射牙形进行扫描。使用 QUART DVT_AP 模型分析了对比度-噪声比 (CNR)、图像均匀性和调制传递函数 (MTF)。使用小儿牙形图像进行了专家评估(整体图像等级、视野适当性、伪影、噪声和分辨率)。根据模型和牙形分析结果确定临界 DAP 水平:CNR和图像均匀性随着DAP的减小而减小;然而,在Cu 1.6 mm(DAP=138.00 mGy-cm2)处出现了图像均匀性拐点,此时数值开始增大。随着 DAP 的降低,MTF 显示出恒定值。专家对整体图像等级的评估显示,Cu 值为 1.9-2.2 毫米(DAP=78.00-103.33 mGy-cm2)的齿状图像 "无诊断价值"。Cu值为0-1.6毫米(DAP=138.00-1697.67 mGy-cm2)的图像分级为 "良好"、"中等 "或 "较差但可解释":结论:将 DAP 降低到 1.6 毫米 Cu 厚度以上会降低 CBCT 图像质量。图像均匀性和临床图像等级表明了在儿科 CBCT 扫描中降低 DAP 的关键决策点。
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来源期刊
Imaging Science in Dentistry
Imaging Science in Dentistry DENTISTRY, ORAL SURGERY & MEDICINE-
CiteScore
2.90
自引率
11.10%
发文量
42
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