Digital Chest Tomosynthesis에서 부가필터에 따른 화질 및 유효선량
Comparison of Image Quality and Effective Dose by Additional Filtration on Digital Chest Tomosynthesis
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초록
디지털 흉부단층합성법 검사에서 부가필터 사용에 따른 환자의 선량과 화질의 특성을 비교해보고자 하였다. 부가필터의 종류는 구리, 알루미늄, 니켈을 사용하였으며, 이 때 각 각의 부가필터에 따른 유효선량, 면적선량을 측정해 보았고, 화질의 물리적 평가방법으로 signal to noise ratio (SNR)과 contrast to noise ratio (CNR)을, 시각적 평가방법으로 contrast detail (CD) phantom을 이용한 CD 곡선을 비교하였다. 그 결과 부가필터별 조사선량이 비슷한 두께는 0.3 mmCu, 3 mmAl, 0.3 mmNi 였으며 부가필터를 사용하지 않았을 때 보다 조사선량 값이 평균 33.1% 감소하였다.각 필터 별 dose area product (DAP) 선량값을 측정한 결과 Ni를 사용하였을 때 선량이 72.9% 감소하여 가장 낮았으며, 필터별 DAP 값은 통계적으로 유의한 차이를 보였다(p<0.01).유효선량은 Ni를 사용하였을 때 가장 낮은 선량 값을 보였고, 필터를 사용하지 않았을 때 0.102 mSv에 비해 48.0% 감소하였다.CD phantom에 의한 시각적 화질평가에서는 각 필터별로 비슷한 양상을 나타냈으며, 3가지 부가필터를 사용 하였을 때 SNR과 CNR은 평균 19.07, 18.17% 감소함을 보였다. 결론적으로 디지털 흉부 단층합성법 검사에서 부가필터로 Ni을 사용할 경우 유효선량 및 DAP 선량 감소, 화질에서 가장 적절함을 알 수 있었다.
Abstract
The purpose of this study is to suggest proper additional filtration by comparisons patient dose and im-age quality among additional filters in digital chest tomosynthesis (DTS). We measured the effective dose, dose area product (DAP) by changing thickness of Cu, Al and Ni filter to compare image quality by CD curve and SNR, CNR.Cu, Al and Ni exposure dose were similar thickness 0.3 mm, 3 mm and 0.3 mm respectively. The ex-posure dose using filter was decreased average about 33.1% than non filter. The DAP value of 0.3 mm Ni were decreased 72.9% compared to non filter and the lowest dose among 3 filter. The effective dose of 0.3 mm Ni were decreased 48% compared to 0.102 mSv effective dose of non filter.At the result of comparison of image quality through CD curve there were similar aspect graph among Cu, Al and Ni. SNR was decreased average 19.07%, CNR was average decreased 18.17% using 3 filters. In conclusion, Ni filtration was considered to be most suitable when considered comprehensive thick-ness, character, sort of filter, dose reduction and image quality evaluation in DTS.
참고문헌 (15)
- Korea Ministry of Food and Drug Safety, "Radiation safety management series No.14, Patient dose recommended guidelines", ~ (2007)
- Bacher K, "Dose reduction in patientsundergoing chest imaging: Digital amorphous silicon flatpanel detector radiography versus conventional film-screen radiography and phosphor-based computed radiography", Am. J. Roentgenol, 181(4), pp.923~929 (2003)
- Kroft LJ, "Detection of simulated nodules on clinical radiographs: dose reduction at digital poster-oanterior chest radiology", Radiology, 241(2), pp.392~398 (2006)
- Hamer OW, "Chest radiography with a flatpanel detector:Image quality with dose reduction after copper filtration", Radiology, 237(2), pp.691~700 (2005)
- Arkins HL, "Effect of absorption edge filters on diagnostic X-ray spectra", Radiology, 115(2), pp.210~214 (1975)
- 채승훈, "흉부 단층합성 영상에서의 폐 분할 방법", 한국정보기술학회논문지, 12(05), pp.51~58 (2014), 한국정보기술학회[DOI]
- Dobbins JT, "Digital tomosynthesis of the chest", J Thorac Imaging, 23(2), pp.86~92 (2008)
- The clinical utility of tomosynthesis in lung cancer Diagnosis, "M. Ito", Shimadzu clinical Application, 1~3 (2009)
- McAdams HP, "Recent advances in chest radiography", Radiology, 241(3), pp.663~683 (2006)
- Bach PB, "Benefits and harms of CT screening for lung cancer a systematic review", The Journal of the Americal Medical Association, 307(22), pp.2418~2429 (2012)
- James TD, "Digital tomosynthesis of the chest for lung nodule detection: interim sensitivity results from an ongoing NIH-sponsored trial", Med Phys, 35, pp.2554~2557 (2008)
- Sabol JM, "A monte carlo estimation of effective dose in chest tomosynthesis", Medical Physics, 36, pp.5480~ (2009)
- 김계선, "흉부 디지털토모영상의 기본모드 및 부가여과사용 시 환자선량과 화질비교", 한국콘텐츠학회 논문지, 13(9), pp.288~294 (2013), 한국콘텐츠학회[DOI]
- K. M. Choi, "The reduction of radiation dose using key-filter in chest radiography", Journal of Korean society of radiological technology, 19(2), pp.67~70 (1996)
- Min-Yong Lee, "The effect of x-ray filter materials in the skin dose & tube loading at x-ray examinations", pp.2005