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KMID : 1131320150170010117
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Journal of Korean Society of Computed Tomographic Technology
2015 Volume.17 No. 1 p.117 ~ p.124
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Evaluation of Image Quality and the Usefulness with/without Opposite Upper Extremity Elevation During a One-Sided Shoulder CT Scan
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Joo Byoung-Uk
Seo Dong-Won
Lim Ki-Bin
Kang Sung-Ho
Lim Jae-Sik
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Abstract
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Purpose : Generally, during a two-sided shoulder CT scan, the patient is either in a supine position or in a neutral position in a hand supinated state. During a one-sided scan, the patient also is set in a supine position or a neutral position. This study will compare the image quality of the shoulder CT scans when it is taken with the patient in a supine position with their opposite upper extremity elevated and when it is not, to see if there exists any usefulness of the opposite upper extremity elevation during a shoulder CT scan.
Materials and Methods : The images used are one-sided shoulder CT scans taken from February to August of the year 2014 with the use of Somatom Sensation 64 MDCT (Simens, Enlarge, Germany), with a total of 100 patients (47 males, 53 females, average BMI 23.99), 100 patients (experimental group) with opposite upper extremity elevated, and 40 patients (control group) without their opposite upper extremity elevated. The HU, Noise, and SNR values are found from the 20mm point of the superior (ROI 1), inferior (ROI 2), internal (ROI 3), and external (ROI 4) part from the humerus head to the center of the surgical neck being the standard. For quantitative analysis, the statistical package program (SPSS 19.0) and a 95% conficence interval are used.
Results : For the control group, the average value of the HU, Noise, and SNR came out as ROI 1 56.17, 32.92, 3.53, ROI 2 57.55, 35.73, 3.62, ROI 3 52.44, 36.35, 3.28, ROI 4 51.55, 31.53, 3.22 respectively, and for the experimental group, the value came out as ROI 1 54.08, 30.43, 3.76, ROI 2 56.86, 34.76, 3.91, ROI 3 49.82, 35.37, 3.45, ROI 4 52.19, 29.80, 3.62 respectively. The results show that the HU and Noise value came out lower for the experimental group compared to the control group, and the SNR value came out higher for the experimental group. The results of the quantitative analysis show that gender (p=0.509) and BMI (p=0.722) statistically show no noticeable difference. Excluding the difference in statistics shown in the HU value of ROI 3 (p=0.03) and the SNR value of ROI 4 (p=0.004), all other statistics show no noticeable difference (p>0.05).
Conclusion : Aside from the SNR value of ROI 4, the statistical data between the experimental and the control group showed no noticeable difference in value. However, the experimental group compared to the control group resulted in a higher value in SNR. As a result, if possible, it is useful for the patient to elevate their opposite upper extremity during a shoulder CT scan for more accurate results.
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KEYWORD
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CT Shoulder, SNR, Upper Extremity Elevation
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