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Coronary Calcium Screening Using Low-Dose Lung Cancer Screening: Effectiveness of MDCT with Retrospective Reconstruction

Sung Mok Kim1, Myung Jin Chung1, Kyung Soo Lee1, Yeon Hyun Choe1, Chin A. Yi1 and Bong-Keun Choe2

1 Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, 50 Ilwon-dong, Kangnam-ku, Seoul 135-710, Korea.
2 Department of Preventive Medicine, School of Medicine, Kyunghee University, Seoul, Korea.


Figure 1
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  		Fig. 1A —Comparison of image quality between dedicated coronary calcium-scoring CT and retrospective reconstruction of nongated low-dose chest CT. Axial image of coronary calcium-scoring CT in 67-year-old man shows elongated calcified plaque (arrow) at left anterior descending coronary artery.

 

Figure 2
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  		Fig. 1B —Comparison of image quality between dedicated coronary calcium-scoring CT and retrospective reconstruction of nongated low-dose chest CT. Same plaque is shown on same plane of reconstructed axial image of low-dose CT with 5-mm section thickness but looks smaller than in reference image (A).

 

Figure 3
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  		Fig. 1C —Comparison of image quality between dedicated coronary calcium-scoring CT and retrospective reconstruction of nongated low-dose chest CT. Reconstructed axial image of low-dose CT with 2.5-mm section thickness shows coronary plaque having similar size as in reference image (A).

 

Figure 4
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  		Fig. 1D —Comparison of image quality between dedicated coronary calcium-scoring CT and retrospective reconstruction of nongated low-dose chest CT. Coronary plaque on axial image of low-dose CT with 1-mm section thickness is similar to that on A and C. Note higher background noise on this image, which compromises plaque conspicuity.

 

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