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Comparative Evaluation of Resolution according to Frequency Change for SPECT

단일광자방출전산화단층촬영(SPECT)을 위한 주파수 변동에 따른 분해능 비교평가

  • 김성철 (가천의과학대학교 방사선학과) ;
  • 박수연 (가천의과학대학교 방사선학과) ;
  • 조영권 (세란동물병원) ;
  • 안성민 (가천의과학대학교 방사선학과)
  • Received : 2009.08.04
  • Accepted : 2009.09.29
  • Published : 2009.12.28

Abstract

In clinical SPECT, FWHM provides quality information of the images obtained under different observing conditions. Therefore, the purpose of this study was to determine the optimum cut off level with comparison of FWHM according to cut off levels in each filter - Band limited, Sheep-Logan, Hanning, Hamming, Low pass cosine, Parazen and Butterworth filter in a SPECT camera. I recorded images along the X, Y, Z-axis with 99mTcO4 point source and measured FWHM with profile curves. In conclusion, all filters showed the longest figures of FWHM with cut off level 0.4, which has the worst image resolution. The images with cut off level 0.7 showed best image resolution. The shortest average of FWHM in MS2 was $11.07\pm0.07mm$ using the Butterworth filter, in MS3 it was $8.44\pm0.19mm$ through using the Hanning filter.

Keywords

SPECT(Single Photon Emission Computed Tomography);Frequency;Resolution;FWHM(Full Width at Half Maximum)

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