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Iranian Journal of Medical Physics، جلد ۱۷، شماره ۱، صفحات ۳۸-۴۷
عنوان فارسی
چکیده فارسی مقاله
کلیدواژه‌های فارسی مقاله
عنوان انگلیسی Design and Construction of an Affordable Phantom for Electron Density Measurement and Linearity Tests of Computed Tomography Systems
چکیده انگلیسی مقاله Introduction: The performance of computed tomography is routinely checked using phantoms, which are known as important diagnostic imaging tools. Depending upon the aim of the study, different phantoms are designed, while trying to satisfy certain levels of diversities in their application. Material and Methods: The present study describes the construction of an inexpensive phantom designed for simultaneous measurements of 12 different samples. The body of the phantom, test tube holders, and test tubes were made of materials of low attenuation coefficient. Body of the phantom was filled with water. Test tubes filled with solutions of known chemical compositions were mounted on the test tube holders. The whole phantom was scanned at 80, 100, 120, 140 kVp to evaluate the performance of the CT system. Using Hounsfield Unit (HU) data from these liquid samples of known electron density, the phantom was calibrated for electron density measurements. Results: The system's accuracy and reproducibility were verified by measuring the HU values for some known materials. According to the results obtained from the experimental datawith liquid samples, the accuracy of the water and noise was within ±3.2 HU and 0.6%, respectively. Moreover, the image uniformity error was less than ±2 HU, and CT system's linearity for calibration was estimated with 99.9% confidence. Conclusion: The present system gives satisfactory results with known samples and can be used with confidence for characterizing unknown materials.
کلیدواژه‌های انگلیسی مقاله
نویسندگان مقاله | Rezvan Ravanfar Haghighi
Medical Imaging Research Center, Shiraz University of Medical Sciences, Shiraz, Iran


| Sabysachi Chatterjee
Ongil, 79 D3, Sivaya Nagar, Reddiyur Alagapuram, Salem 636004. India


| Sepideh Sefidbakht
Medical imaging Research Centre, Shiraz University of Medical Sciences, Research Tower, Khalili Street, Shiraz 7193635899, Iran


| Reza Jalli
Medical imaging Research Centre, Shiraz University of Medical Sciences, Research Tower, Khalili Street, Shiraz 7193635899, Iran


| Vani Vardhan Chatterjee
Department of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore 560012. INDIA
نشانی اینترنتی http://ijmp.mums.ac.ir/article_13180.html
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کد مقاله (doi)
زبان مقاله منتشر شده en
موضوعات مقاله منتشر شده
نوع مقاله منتشر شده Original Paper
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