Brain CT 검사에 있어 수정체 피폭선량 감소를 위한 Goggle 착용의 유용성에 대한 연구

다국어 초록 (Multilingual Abstract)

I. Purpose
This study evaluates the usefulness of wearing goggle for the effect of reducing the exposed dose in the lens and the quality of the pictures in Brain CT test by conducting a comparative analysis with the tests using no shield and bismuth.
II. Materials and methods
The objects of study are divided into the three groups: the groups wearing goggle, the groups wearing bismuth, the groups wearing no shield. The dose and the quality of the pictures are examined through the quantitative/qualitative analysis
The doses are measured by attaching PSD(Patient skin Dosimeter) on both lenses of Phantom(Linac surgery head phantom, USA) and the frontal lobe. The quality of the pictures is measured by the average score (on a five-points scale) given by four specialists in the Diagnostic Imaging department, targeting ninety patients who took the Brain CT test in the center from January to February in 2012.
For the significance test of each group, the numerical values of HU(Hounsfield Unit) in both lenses, eyes, and the frontal lobe and the Noise are gauged with the one-way layout variance analysis using the statistical package program, SPSS 12.0.
III. Result
As a result of the dosimetry using Phantom, Rt Lens Dose has decreased from 24.2mGy to 14.6mGy (39.7%) and Lt Lens Dose from 26.7mGy to 16.7mGy (37.5%) when wearing goggle in comparison with wearing no shield. When wearing, Rt Lens Dose has decreased from 24.2 mGy to 15.4 mGy (36.4%) and Lt Lens Dose from 26.7mGy to 16.9mGy (36.7%).
Brain Dose in the frontal lobe appears as the right side 22±0.4mGy, the left side 26±0.3 mGy, not showing particular differences in all three groups.
The quality of the pictures has shown noticeable differences in all parts except the Noise around the frontal lobe. The average score measured by the specialists are as following: in case of lenses, the point of the group wearing no shield is 4.3, the group wearing bismuth is 2.2, and the group wearing goggle is 3.5, proving that the group with goggle has 37% higher points than the group with bismuth. In case of eyeholes, the point of the group wearing no shield is 4.1, the group wearing bismuth is 2.5, the group wearing goggle is 3.6, proving that the group with goggle has 30% higher points than the group wearing bismuth. In case of a temporal bone, all three groups does not show any particular differences (4.4±0.1).
IV. Conclusion
As a result, wearing goggle appears more effective than wearing bismuth in reducing exposed che while still maintain the quality of the pictures in the Brain CT test.