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SIGNAL-TO-NOISE RATIO AND CONTRAST-TO-NOISE RATIO IN LOW-DOSE CT FOR MONITORING TRAUMATIC BRAIN INJURY
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Abstract
Objective: This study aims to investigate the characteristics of signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) in low-dose computed tomography (CT) for monitoring traumatic brain injury (TBI). Subjects and Methods: A cross-sectional descriptive study was conducted on 35 patients (P) being monitored for TBI. Low-dose CT scans of the brain using an 80 kV protocol were performed at Viet Duc Hospital from May 2024 to October 2024. Brain structure densities in different regions were measured and compared with standard-dose CT scans (120 kV) regarding radiation dose, SNR, and CNR. Results: The SNR decreased in low-dose CT compared to standard-dose CT at the following regions: frontal cortex (9.31 ± 2.992 vs. 12.47 ± 4.996), frontal white matter (6.77 ± 1.847 vs. 8.05 ± 2.565), cerebellar cortex (7.91 ± 2.889 vs. 8.99 ± 2.612), and pons (6.60 ± 1.487 vs. 7.69 ± 2.087) (p < 0.05). However, SNR increased in hematoma regions from 10.92 ± 2.821 to 13.62 ± 4.201 (p < 0.05). The CNR comparison showed a decrease in low-dose CT compared to standard-dose CT in the frontal region (2.03 ± 0.551 vs. 2.49 ± 0.572) and cerebellar vermis (0.16 ± 0.329 vs. 0.24 ± 0.254) (p < 0.05). However, CNR in hematoma regions showed no significant difference between the two groups (p = 0.567). Conclusion: Low-dose CT significantly reduces radiation exposure compared to standard-dose CT while providing higher SNR for hematoma and maintaining comparable CNR.
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Keywords
low-dose CT, computed tomography, traumatic brain injury, CT radiation dose.
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