Wan Hassan, Wan Muhamad Saridan and Munajat, Yusof and Sahibuddin, Shamsul (2004) Determination Of Noise Equivalent Quanta Of Medical Screen-Films. Jurnal Teknologi C, 40 (C). pp. 11-20. ISSN 0127-9696
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Abstract
Noise equivalent quanta (NEQ) of Lanex Regular/T Mat G (LRG) and Lanex Regular/ T Mat L (LRL) screen-film combinations were determined using modulation transfer function (MTF) and noise power spectrum (NPS) data. To accomplish this, average gamma of the radiograph was computed, MTF and NPS data were linearly interpolated and these values were used to compute the NEQ by means of a computer program. The computation shows that for spatial frequency of 0–0.7 cycles mm–1, the NEQ of LRG is slightly lower than that of LRL, and for spatial frequency of 0.7–1.5 cycles mm–1, the NEQ for both are almost the same for frequencies greater than 1.5 cycles mm–1. However, the NEQ of the former is greater than that of the latter. Relatively, this indicates that low frequency signals show better on LRL, but high frequency signals show better on LRG.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Diagnostic radiology, image quality, modulation transfer function, noise equivalent quanta, noise power spectrum, screen-film |
| Subjects: | Q Science > QC Physics |
| Divisions: | Science |
| ID Code: | 1539 |
| Deposited By: | En Mohd. Nazir Md. Basri |
| Deposited On: | 07 Mar 2007 07:13 |
| Last Modified: | 01 Jun 2010 02:55 |
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