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Effects of Sublingual Nitroglycerin on Coronary Lumen Diameter and Number of Visualized Septal Branches on 64-MDCT Angiography

Isabel Decramer1,2, Piet K. Vanhoenacker1, Giovanna Sarno2, Lieven Van Hoe1, Olivier Bladt1, William Wijns2 and Paul M. Parizel3

1 Department of Radiology and Imaging, OLV Ziekenhuis, Moorselbaan 164, Aalst, Oost Vlaanderen 9300, Belgium.
2 Cardiovascular Center Aalst, Aalst, Belgium.
3 Department of Radiology, University Hospital Antwerp, Edegem, Belgium.


Figure 1
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  		Fig. 1 —Curved multiplanar reconstruction (MPR) along long axis of vessel (left), and two perpendicular 2D profiles (right) at location indicated on curved MPR (TeraRecon Aquarius workstation). Profile is line crossing lumen, resulting in graph representing attenuation (in Hounsfield units) along that line. Pixels with attenuation values higher than average attenuation of contrast material in opacified lumen minus 3 SD are supposed to be part of coronary lumen.

 

Figure 2
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  		Fig. 2 —Curved multiplanar reconstruction along long axis of vessel shows how software on TeraRecon Aquarius workstation automatically calculates volume inside vessel wall corresponding to attenuation between minimal and maximal values in Hounsfield units.

 

Figure 3
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  		Fig. 3 —Box-and-whisker diagram shows number of septal branches in groups A and B.

 

Figure 4
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  		Fig. 4 —Bar graph with 95% CIs shows signal-to-noise ratio (SNR) in groups A (white bars) and B (gray bars) for all segments evaluated: LM = left main artery, RCA = right coronary artery, RPDA = right posterior descending artery, CX = circumflex artery, LAD = left anterior descending artery, D3 = distal part of third diagonal branch.

 

Figure 5
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  		Fig. 5 —Bar graph with 95% CIs shows contrast-to-noise ratio (CNR) in groups A (white bars) and B (gray bars) for all segments evaluated: LM = left main artery, RCA = right coronary artery, RPDA = right posterior descending artery, CX = circumflex artery, LAD = left anterior descending artery, D3 = distal part of third diagonal branch.

 

Figure 6
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  		Fig. 6 —Bar graph with 95% CIs of lumen diameter in right coronary artery (RCA) and left anterior descending artery (LAD) in groups A (white bars) and B (gray bars) for observer 1.

 

Figure 7
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  		Fig. 7 —Bar graph with 95% CIs shows volume in right coronary artery (RCA) and left anterior descending artery (LAD) in groups A (white bars) and B (gray bars) for observer 1.

 

Figure 8
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  		Fig. 8A —Bland-Altman plots show interobserver agreement of volume measurements. Plots show volume data for left anterior descending artery (LAD) (A) and right coronary artery (RCA) (B) of group A.

 

Figure 9
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  		Fig. 8B —Bland-Altman plots show interobserver agreement of volume measurements. Plots show volume data for left anterior descending artery (LAD) (A) and right coronary artery (RCA) (B) of group A.

 

Figure 10
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  		Fig. 8C —Bland-Altman plots show interobserver agreement of volume measurements. Plots show volume data for LAD (C) and RCA (D) of group B.

 

Figure 11
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  		Fig. 8D —Bland-Altman plots show interobserver agreement of volume measurements. Plots show volume data for LAD (C) and RCA (D) of group B.

 

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