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KMID : 1149020190210010045
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Journal of Korean Society of Computed Tomographic Technology
2019 Volume.21 No. 1 p.45 ~ p.51
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The study about metal artifact reduction by using Tin-Filter in CT scan
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Jeong Sang-Heon
Lee Seong-Ju
Jin Hyeong-Min
Kim Jong-Hyo
Jeong Heon-Jeong
Kim Dong-Seong
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Abstract
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Purpose: In this study, we focused on whether we can reduce the metal artifact by using Tin-Filter in CT scan Somatom Force(SIEMENS,Germany) was used for the CT equipment.
Materials & Method: Noise and SNR were obtained by scanning the self-produced phantom using IM Nail and AAPM phantom in units of 10 kV from 80 kV to 150 kV based on CTDIvol 10 (mGy). Tin-Filter was applied to 150 kV.RMSE was used to measure the precision, and qualitative assessment was performed by using the Likert scale on liver noduleand portal vein of PH5 phantom. Result values were analyzed by ANOVA Test using statistical program SPSS. Noise and SNR evaluation using self-produced phantom and AAPM phantom showed a tendency of noise reduction with increasing kV.
Result: Especially, when Tin-Filter was applied, it decreased 52.3%~79.9% (P<0.01). The maximum value of RMSE was 34.27 at 140 kV, and the minimum value of RMSE was 5.95 at the Tin150 kV with the Tin-Filter. In the case of qualitative assessment, there was no statistically significant difference in image evaluation (p=0.792).
Conclusion: As a result, it is considered that the metal artifact can be reduced without degrading the overall quality of the image and increasing the Dose, if the scan is performed using the Tin-filter.
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KEYWORD
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Tin-Filter, Metal Artifact, Metal Artifact Reduction, Root Mean Square Error(RMSE)
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