Universiti Teknologi Malaysia Institutional Repository

Computation of detective quantum efficiency of medical x-ray radiographic screen-films

Khanmirzaei, Mohammad Hassan (2010) Computation of detective quantum efficiency of medical x-ray radiographic screen-films. Masters thesis, Universiti Teknologi Malaysia, Faculty of Science.

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Abstract

Detective quantum efficiency (DQE) is one of the important measures in the assessment of image quality and detector performance. Detective quantum efficiency of radiographic screen-film depends on noise power spectrum (NPS), modulation transfer function (MTF), gamma of the film and photon fluence. DQE of two types of screenfilms namely Lanex Regular/T-Mat G/RA and Lanex Regular/T-Mat L/RA were determined using MTF and NPS data, separately. For calculation of gamma of the film, characteristic curves of each screen-film were used to find slope of straight part of the curves. Photon fluence was estimated using published literature. DQE of the screenfilms were computed by MATLAB program for three optical densities 0.7, 1.0 and 1.4. The X-ray source was at 81 kVP. MTF of Lanex Regular/T-Mat G/RA was found to be slightly better than Lanex Regular/T-Mat L/RA for spatial frequencies between 0.5 and 3.0, but it was found to be slightly better MTF for Lanex Regular/T-Mat L/RA for spatial frequencies between 5.2 and 7.0. NPS of Lanex Regular/TMat G/RA was found one and a half times bigger than Lanex Regular/T-Mat L/RA. DQE comparison of these two types of screen-films was made. The results show Lanex Regular/T-Mat G/RA has better DQE than Lanex Regular/T-Mat L/RA, at low frequencies.

Item Type:Thesis (Masters)
Additional Information:Supervisor : Assoc. Prof. Dr. Wan Muhamad Saridan Wan Hassan; Thesis (Sarjana Sains (Fizik)) - Universiti Teknologi Malaysia 2010
Uncontrolled Keywords:radiography, Detective quantum efficiency (DQE), medical x-ray
Subjects:Q Science > QC Physics
Divisions:Science
ID Code:16333
Deposited By: Ms Zalinda Shuratman
Deposited On:01 Feb 2012 07:17
Last Modified:01 Feb 2012 07:21

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