A simplified low-cost phantom for image quality assessment of dental cone beam computed tomography unit

IF 1.8 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

Journal of Medical Radiation Sciences Pub Date : 2023-11-15 DOI:10.1002/jmrs.738

James Anthony Rabba PhD, Hanis Arina Jaafar Dipl, Fatanah Mohamad Suhaimi PhD, Mohd Zubir Mat Jafri PhD, Noor Diyana Osman PhD

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引用次数: 0

Abstract

Introduction

A standardised testing protocol for evaluation of a wide range of dental cone beam computed tomography (CBCT) performance and image quality (IQ) parameters is still limited and commercially available testing tool is unaffordable by some centres. This study aims to assess the performance of a low-cost fabricated phantom for image quality assessment (IQA) of digital CBCT unit.

Methods

A customised polymethyl methacrylate (PMMA) cylindrical phantom was developed for performance evaluation of Planmeca ProMax 3D Mid digital dental CBCT unit. The fabricated phantom consists of four different layers for testing specific IQ parameters such as CT number accuracy and uniformity, noise and CT number linearity. The phantom was scanned using common scanning protocols in clinical routine (90.0 kV, 8.0 mA and 13.6 s). In region-of-interest (ROI) analysis, the mean CT numbers (in Hounsfield unit, HU) and noise for water and air were determined and compared with the reference values (0 HU for water and −1000 HU for air). For linearity test, the correlation between the measured HU of different inserts with their density was studied.

Results

The average CT number were −994.1 HU and −2.4 HU, for air and water, respectively and the differences were within the recommended acceptable limit. The linearity test showed a strong positive correlation (R² = 0.9693) between the measured HU and their densities.

Conclusion

The fabricated IQ phantom serves as a simple and affordable testing tool for digital dental CBCT imaging.

Abstract Image

查看原文本刊更多论文

一种用于牙科锥束计算机断层成像单元图像质量评估的简化低成本模型。

导语:用于评估广泛的牙锥束计算机断层扫描(CBCT)性能和图像质量(IQ)参数的标准化测试方案仍然有限，一些中心无法负担商用测试工具。本研究旨在评估用于数字CBCT单元图像质量评估(IQA)的低成本制造假体的性能。方法:采用定制的聚甲基丙烯酸甲酯(PMMA)圆柱形模体，对Planmeca ProMax 3D Mid数字牙科CBCT装置进行性能评估。该模型由四个不同的层组成，用于测试特定的IQ参数，如CT数精度和均匀性、噪声和CT数线性。采用临床常规扫描方案(90.0 kV, 8.0 mA, 13.6 s)对幻肢进行扫描。在感兴趣区域(ROI)分析中，确定了水和空气的平均CT数(以Hounsfield单位表示，HU)和噪声，并与参考值(水为0 HU，空气为-1000 HU)进行了比较。为了进行线性检验，研究了不同刀片的测量HU与密度之间的相关性。结果:空气和水的平均CT值分别为-994.1 HU和-2.4 HU，差异均在推荐可接受范围内。线性检验结果表明，测得的HU与其浓度呈正相关(R2 = 0.9693)。结论:自制IQ假体是一种简单、经济的牙科数字CBCT成像检测工具。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Medical Radiation Sciences RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-

CiteScore

3.20

自引率

4.80%

发文量

审稿时长

8 weeks

期刊介绍： Journal of Medical Radiation Sciences (JMRS) is an international and multidisciplinary peer-reviewed journal that accepts manuscripts related to medical imaging / diagnostic radiography, radiation therapy, nuclear medicine, medical ultrasound / sonography, and the complementary disciplines of medical physics, radiology, radiation oncology, nursing, psychology and sociology. Manuscripts may take the form of: original articles, review articles, commentary articles, technical evaluations, case series and case studies. JMRS promotes excellence in international medical radiation science by the publication of contemporary and advanced research that encourages the adoption of the best clinical, scientific and educational practices in international communities. JMRS is the official professional journal of the Australian Society of Medical Imaging and Radiation Therapy (ASMIRT) and the New Zealand Institute of Medical Radiation Technology (NZIMRT).