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KMID : 1149020190210020009
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Journal of Korean Society of Computed Tomographic Technology
2019 Volume.21 No. 2 p.9 ~ p.21
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The Study of the Usefulness of Breathing method using Straw for Larynx CT Examination
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Chae Hee-Chang
Nam Tae-Hyun
Seo Choong-Beom
Kim Sung-Kwan
Gwon Sun-Ahn
Dae Chang-Min
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Abstract
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Purpose: The study purpose was to investigate the usefulness of straw-blow method to limit the motion artifact of the larynx.
Material and Method: 64 MDCTs and a 3D workstation were used for this study. In phantom study, we scan a head phantom with three different angles of straw. We set area of interests at the four anatomical location to measure CT number and noise. The reference value of CT number and noise is set to ±5%. In clinical study, assessment of supraglottis, glottis, subglottis and the glottic angle, the vertical distance of the pyriform sinus and the appearance of laryngeal ventricle were measured. In addition, five points scale method was used as a qualitative analysis.
Results: In phantom study, measured CT number and noise were satisfied reference value of ±5%. In clinical study, quantitative assessment results showed that the change rate of supraglottis and subglottis area increased by 22.6% and 8.7%, while the glottis area decreased by 18.2%. The rate of change in the glottic angle decreased by 10.1%. the pyriform sinus increased by 28.1% (left) and 26.2% (right). the laryngeal ventricle was shown that 50 cases in the experimental group. Qualitative evaluation showed that motion artifact didn’t occur with straw-blow method.
Conclusions: Straw-blow technique can provide sufficient diagnostic information. Furthermore, high quality image of larynx will be helpful for decision-making of appropriate treatment plan.
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KEYWORD
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larynx CT, straw-blow, vocal cord
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