Correct patient centering increases image quality without concomitant increase of radiation dose during adult intracranial computed tomography

Hussain, Almohiy and Alasar, Emad and Saade, Charbel (2016) Correct patient centering increases image quality without concomitant increase of radiation dose during adult intracranial computed tomography. Journal of Medical Imaging and Radiation Sciences, 47 (3). pp. 235-242. ISSN 1939-8654

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Official URL | رابط موقع المجلة: http://www.jmirs.org/article/S1939-8654(16)30038-8...

Abstract|ملخص البحث

Purpose: To evaluate the impact of patient centering and radiation dose during intracranial computed tomography (ICT) on quantitative and qualitative image quality. Materials and Methods: 500 consecutive patients who underwent ICT were retrospectively reviewed using a 128-slice CT scanner (Definition AS+, Siemens, Germany). Patients were subjected in equal numbers to one of two positioning protocols: Group A, poorly centered; and Group B, involved accurate centering prior to imaging. Gray-white matter (GWM) conspicuity, contrast-to-noise (CNR), and signal-to-noise (SNR) in each group were calculated. Qualitative image quality in terms of GWM differentiation, distinctness of posterior fossa contents, and overall diagnostic acceptability were evaluated by two neuroradiologists. The dose length product (DLP), CNR, SNR, and noise were measured between each group and data generated were compared using Mann-Whitney U non-parametric statistics. Visual grading characteristic (VGC) and kappa analyses were performed. Results: The mean noise index was significantly lower in group B (2.61 ± 0.29) compared to A (2.66 ± 0.21) (p<0.02). The mean attenuation of GWM, SNR, and CNR in the frontal lobe (A;1:0.77, 0.84, 8.70 ± 1.36 and B;1:0.65,0.85, 15.32±1.21) (p<0.02), occipital lobe (A;1:1.10, 1.18, 10.79±2.11, and B;1:0.94,0.64,14.41±3.09) (p <0.04), and cerebellum (A; 1:0.79, 0.90, 12.56±4.08 and B; 1:0.82,0.87,14.07±2.28) (p<0.04) were significantly higher in group B compared to A, while the globus pallidus, caudate nucleus, and optic track in the basal ganglia demonstrated no difference in each group (p>0.05). Mean DLP demonstrated no significance between each group (A: 1312.03 ± 133.92, B: 1298.11 ± 130.61). The qualitative analyses demonstrated significant increases in VGC for each reader (p<0.02) and inter-observer agreement was significantly increased in protocol B (k=0.81) compared to A (k=0.62). Conclusion: Correct patient centering increases the CNR and SNR in both GWM in the left and right hemispheres of the brain during ICT.

Item Type|تصنيف النتاج العلمي: Article| منشور علمي
Subjects | مجال موضوع النشر: Radiological Sciences
Divisions | الكلية: College of Applied Medical Sciences > Radiological Sciences
Depositing User: Hussain Almohiy
Date Deposited: 10 Feb 2019 08:02
Last Modified: 10 Feb 2019 08:02
URI: http://eprints.kku.edu.sa/id/eprint/3253

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