International Journal For Multidisciplinary Research

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Evaluation of Image Quality: Spatial and Contrast Resolution Comparison Between 64-Slice and 128-Slice CT Systems

Author(s) Mr. Bharat Bhushan Dagur, Ms. Rukamanee yadav
Country India
Abstract Introduction: Spatial and contrast resolution are critical determinants of CT image quality, especially in applications such as cardiac and vascular imaging. Improved resolution enables better visualization of fine anatomical structures and low-contrast lesions.
Objective: To perform a quantitative phantom-based comparison of image quality between a 64-slice CT system and a modern 128-slice CT system under identical scanning conditions.
Methodology: Used standardized phantoms to evaluate image quality parameters, Assessed high-contrast spatial resolution via Modulation Transfer Function (MTF), Measured low-contrast detectability, contrast-to-noise ratio (CNR), and image noise and Compared voxel sizes: 128-slice CT (~0.4 mm isotropic) vs 64-slice CT (~0.5 mm isotropic).
Results: Spatial Resolution: The 128-slice CT demonstrated ~15% finer resolution (higher MTF50 and MTF10 frequencies) compared to the 64-slice system. Low-Contrast Detectability: The 128-slice CT could resolve 3–4 mm low-contrast objects at smaller HU differences, outperforming the 64-slice CT. CNR and Noise: The 128-slice system showed slightly improved CNR while maintaining comparable noise levels.
Discussion: The enhanced performance of the 128-slice CT is attributed to its smaller voxel size and advanced reconstruction algorithms. While both systems produce clinically acceptable images, the 128-slice CT provides better visualization of fine structures (e.g., small stents) and subtle low-contrast lesions.
Conclusion: The 128-slice CT offers measurable improvements in spatial resolution and contrast detectability compared to the 64-slice CT. These advantages can be significant for advanced imaging applications and should be considered in scanner selection and protocol optimization.
Keywords Keywords: CT image quality, spatial resolution, contrast resolution, 64-slice CT, 128-slice CT, contrast-to-noise ratio (CNR).
Published In Volume 7, Issue 4, July-August 2025
Published On 2025-07-27
DOI https://doi.org/10.36948/ijfmr.2025.v07i04.52263
Short DOI https://doi.org/g9vprh
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