Assessment of Medical X-Ray Radiographic Screen-Films in Different Spatial Frequencies According To Detective Quantum Efficiency Computation

Mohammad Hassan Khanmirzaei; Wan Muhamad Saridan Wan Hassan

doi:10.14331/ijfps.2012.330026

Authors

Mohammad Hassan Khanmirzaei Department of Physics,Faculty of Science, University Teknologi Malaysia,81300 Johor, Malaysia Author
Wan Muhamad Saridan Wan Hassan Department of Physics,Faculty of Science, University Teknologi Malaysia,81300 Johor, Malaysia Author

DOI:

https://doi.org/10.14331/ijfps.2012.330026

Keywords:

Detective Quantum Efficiency (DQE), Diagnostic Radiology, Image quality, Screen-film

Abstract

In medical imaging, to make better images there are some measures such as detective quantum efficiency (DQE) and noise equivalent quanta (NEQ) used to evaluate the image quality of each imaging system. Detective quantum efficiency (DQE) is one of the important measures in the assessment of image quality and detector performance. DQE of two types of screen-films namely Lanex Regular/T-Mat G/RA and Lanex Regular/T-Mat L/RA were determined using MTF and NPS data, separately. Moreover, gamma was calculated from characteristic curves for each screen film and photon flounce was estimated using published literature. DQE of the screen-films were computed for three optical densities 0.7, 1.0 and 1.4. The results show Lanex Regular/T-Mat G has better DQE than Lanex Regular/T-Mat L -especially at low frequency with higher contrast for diagnostic radiology purposes.

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