James Anthony Rabba PhD, Hanis Arina Jaafar Dipl, Fatanah Mohamad Suhaimi PhD, Mohd Zubir Mat Jafri PhD, Noor Diyana Osman PhD
{"title":"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。","authors":"James Anthony Rabba PhD, Hanis Arina Jaafar Dipl, Fatanah Mohamad Suhaimi PhD, Mohd Zubir Mat Jafri PhD, Noor Diyana Osman PhD","doi":"10.1002/jmrs.738","DOIUrl":null,"url":null,"abstract":"<div>\n \n \n <section>\n \n <h3> Introduction</h3>\n \n <p>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.</p>\n </section>\n \n <section>\n \n <h3> Methods</h3>\n \n <p>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.</p>\n </section>\n \n <section>\n \n <h3> Results</h3>\n \n <p>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 (<i>R</i><sup>2</sup> = 0.9693) between the measured HU and their densities.</p>\n </section>\n \n <section>\n \n <h3> Conclusion</h3>\n \n <p>The fabricated IQ phantom serves as a simple and affordable testing tool for digital dental CBCT imaging.</p>\n </section>\n </div>","PeriodicalId":16382,"journal":{"name":"Journal of Medical Radiation Sciences","volume":"71 1","pages":"78-84"},"PeriodicalIF":1.8000,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jmrs.738","citationCount":"0","resultStr":"{\"title\":\"A simplified low-cost phantom for image quality assessment of dental cone beam computed tomography unit\",\"authors\":\"James Anthony Rabba PhD, Hanis Arina Jaafar Dipl, Fatanah Mohamad Suhaimi PhD, Mohd Zubir Mat Jafri PhD, Noor Diyana Osman PhD\",\"doi\":\"10.1002/jmrs.738\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div>\\n \\n \\n <section>\\n \\n <h3> Introduction</h3>\\n \\n <p>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.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Methods</h3>\\n \\n <p>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.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Results</h3>\\n \\n <p>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. 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A simplified low-cost phantom for image quality assessment of dental cone beam computed tomography unit
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.
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).
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