Mohd Arif, Muhammad Nuwair (2022) Psychophysical evaluation of ct brain image quality. [Project Paper] (Submitted)
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Abstract
Since its introduction, Computed Tomography (CT) scan has been adapted with more advance technology allowing for quiet with faster acquisition time. However, CT contribute to high dose exposure which led to radiation including cancer risk. Optimization is essential to reduce the exposure but will result in low image quality obtained. Thus, this study aimed at psychophysical evaluation of image quality by adopting different acquisition setting from the standard protocol. Head-based water phantom was scanned on a 64-slice CT scanner (Canon Acquilion, Japan) with various acquisition CT brain protocol where there are eight protocols named from P1 to P8 and P1 as the standard protocol. The kilovoltage at 120 kVp was maintained as it is the clinical value for tube potential. The main focus of parameter changes in this study is on the change of mAs (tube current), AIDR differences (standard, mild, strong), and the 3D sure exposure (OFF, low dose, standard, high quality). By using imQuest software, noise and contrast dependent spatial resolution with noise power spectra (NPS), signal of mean with standard deviation (SD) and the signal-noise-ratio (SNR) respectively using five circle regions of interest (ROI) with 38.6 mm diameter. The ratio value of each patient protocol determined from the mean value collected from images divided by the mean of P1. Furthermore, the figure of merit (FOM) was measured based on SNR value and dose value (CTDIvol) to establish the relationship between image quality and dose exposure. This study found that the choices of IR selection on AIDR 3D and SUREExposure 3D combination as parameter changes underestimated the score of standard parameters produced. High Quality option of SUREExposure 3D gave the best results in term of SNR and NPS. However, the dose exposure was too high that it recorded an increase value of 52% from standard parameter. Hence, this study allows for a novel evaluation that estimate the relationship between image quality and dose based on AIDR 3D (IR) and SUREExposure 3D.
| Item Type: | Project Paper |
|---|---|
| Faculty: | Fakulti Sains |
| Depositing User: | Ms. ROHANA ALIAS |
| Date Deposited: | 20 May 2024 23:58 |
| Last Modified: | 05 Aug 2024 08:55 |
| URI: | http://psaspb.upm.edu.my/id/eprint/1874 |
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