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KMID : 1131320160180010065
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Journal of Korean Society of Computed Tomographic Technology
2016 Volume.18 No. 1 p.65 ~ p.76
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Huh Ja-Yoon
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Abstract
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Purpose : The aim of this study is to optimize the protocols by controlling the parameters, Test conditions, Scan range and ECG window acquisition range and so on. By using an enhanced protocol, We want to take optimal CT images and estimate the patient’s exposure does changes, Noise evaluation and clinical usability.
Materials and method : We compared 40 patients that implement Pulmonary vein CT between April and June, 2015 and 40 patients that implement Pulmonary Vein CT between July and September, 2015. All patients under went pre liminary test and measured DLP, CTDIvol and Noise following protocols. IBM SPSS Statistics (version 21.0) was used to analyze and evaluate the results.
Result : According to the comparison of each protocols, the exposure dose reduction ratio was 70 % in DLP, and 60% in CTDIvol. The ratio differed when focusing on gender in DLP: 68.5% in men while women had a 55% reduction. In CTDIvol, men had a 58.1% reduction while women had a 44.7% reduction. Statistically, there were significant differences in Male and female comparison in DLP and male comparison in CTDIvol. However, there were no significant differences in female comparison in CTDIvol. During the noise evaluation, the increasing ration was shown to be 97.2% in right, while the left showed a ratio of 93.9%. We could observe a 95.5% increasing ration of high noise in general, which show significant differences in statistics.
Conclusion : By using an enhanced protocol, Reduction ratio of exposure dose was shown 50% but Noise was increased 90%. Although Noise was increased, we could know that the core of image interpretation for procedure is not to take an image that has best quality but to take a legible image using as low dose as possible. we could also provide the valuable and appropriated images for clinical use and low exposure dose to patients.
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KEYWORD
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ECG window acquisition range, DLP, CTDIvol
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