Investigation of grid performance using simple image quality tests
| Autor: | Ozlem Birgul, Turan Olgar, Doğan Bor, Umran Onal |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
lcsh:Medical physics. Medical radiology. Nuclear medicine
Computer science Image quality Acoustics media_common.quotation_subject lcsh:R895-920 grid performance Biophysics Radiation 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Simple (abstract algebra) Bucky factor image quality Contrast (vision) Radiology Nuclear Medicine and imaging Image resolution media_common contrast business.industry Digital imaging Grid 030220 oncology & carcinogenesis Original Article Nuclear medicine business Voltage |
| Zdroj: | Journal of Medical Physics, Vol 41, Iss 1, Pp 21-28 (2016) Journal of Medical Physics / Association of Medical Physicists of India |
| ISSN: | 1998-3913 0971-6203 |
| Popis: | Antiscatter grids improve the X-ray image contrast at a cost of patient radiation doses. The choice of appropriate grid or its removal requires a good knowledge of grid characteristics, especially for pediatric digital imaging. The aim of this work is to understand the relation between grid performance parameters and some numerical image quality metrics for digital radiological examinations. The grid parameters such as bucky factor (BF), selectivity (Σ), Contrast improvement factor (CIF), and signal-to-noise improvement factor (SIF) were determined following the measurements of primary, scatter, and total radiations with a digital fluoroscopic system for the thicknesses of 5, 10, 15, 20, and 25 cm polymethyl methacrylate blocks at the tube voltages of 70, 90, and 120 kVp. Image contrast for low- and high-contrast objects and high-contrast spatial resolution were measured with simple phantoms using the same scatter thicknesses and tube voltages. BF and SIF values were also calculated from the images obtained with and without grids. The correlation coefficients between BF values obtained using two approaches (grid parameters and image quality metrics) were in good agreement. Proposed approach provides a quick and practical way of estimating grid performance for different digital fluoroscopic examinations. |
| Databáze: | OpenAIRE |
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