Design and Validation of Synchronous QCT Calibration Phantom: Practical Methodology
| Autor: | Shahrokh Abbasi-Rad, Mohammad Bagher Shiran, Mohamad Shahgholi, Niloofar Ayoobi Yazdi, Malakeh Malekzadeh, Hamidreza Saligheh Rad, Parisa Naghdi, Marzieh Sadat Hoseini |
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| Rok vydání: | 2019 |
| Předmět: |
Accuracy and precision
Scanner Radiological and Ultrasound Technology medicine.diagnostic_test Phantoms Imaging Computer science Calibration phantom Reproducibility of Results Equipment Design Imaging phantom 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine 030220 oncology & carcinogenesis Hounsfield scale Calibration medicine Radiology Nuclear Medicine and imaging Quantitative computed tomography Tomography X-Ray Computed Densitometry Spiral ct Biomedical engineering |
| Zdroj: | Journal of Medical Imaging and Radiation Sciences. 50:157-162 |
| ISSN: | 1939-8654 |
| Popis: | Introduction Quantitative computed tomography (QCT) can supplement dual x-ray absorptiometry by enabling geometric and compartmental bone assessments. Whole-body spiral CT scanners are widely available and require a short scanning time of seconds, in contrast to peripheral QCT scanners, which require several minutes of scanning time. This study designed and evaluated the accuracy and precision of a homemade QCT calibration phantom using a whole-body spiral CT scanner. Materials and Methods The QCT calibration phantom consisted of K2HPO4 solutions as reference. The reference material with various concentrations of 0, 50, 100, 200, 400, 1000, and 1200 mg/cc of K2HPO4 in water were used. For designing the phantom, we used the ABAQUS software. Results The phantoms were used for performance assessment of QCT method through measurement of accuracy and precision errors, which were generally less than 5.1% for different concentrations. The correlation between CT numbers and concentration were close to one (R2 = 0.99). Discussion Because whole-body spiral CT scanners allow central bone densitometry, evaluating the accuracy and precision for the easy to use calibration phantom may improve the QCT bone densitometry test. Conclusion This study provides practical directions for applying a homemade calibration phantom for bone mineral density quantification in QCT technique. |
| Databáze: | OpenAIRE |
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