Haghighi, RR and Chatterjee, S and Sefidbakht, S and Jalli, R and Vani, VC (2020) Design and construction of an affordable phantom for electron density measurement and linearity tests of computed tomography systems. In: Iranian Journal of Medical Physics, 17 (1).
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Abstract
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 data with 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. © 2019 Mashhad University of Medical Sciences.
| Item Type: | Journal Article |
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| Publication: | Iranian Journal of Medical Physics |
| Publisher: | Mashhad University of Medical Sciences |
| Additional Information: | Copyright of this article belongs to Mashhad University of Medical Sciences |
| Keywords: | Carrier concentration; Density measurement (specific gravity); Electron density measurement; Electrons; Phantoms, Attenuation coefficient; Chemical compositions; Design and construction; Diagnostic imaging; Hounsfield units; Image uniformity; Reproducibilities; Simultaneous measurement, Computerized tomography |
| Department/Centre: | Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics |
| Date Deposited: | 06 Apr 2021 11:44 |
| Last Modified: | 06 Apr 2021 11:44 |
| URI: | http://eprints.iisc.ac.in/id/eprint/65654 |
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