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Threshold adjusted calcium scoring using CT is less susceptible to cardiac motion and more accurate
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10.1118/1.3049590
/content/aapm/journal/medphys/36/2/10.1118/1.3049590
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/36/2/10.1118/1.3049590

Figures

Image of FIG. 1.
FIG. 1.

Schematic longitudinal cross section of the cylinders of phantom 2. The numbers indicate the length of the individual section given in millimeters. The gray areas represent the different cylindrical shaped calcifications (density given in the text). The white sections have a density of 7 HU.

Image of FIG. 2.
FIG. 2.

Example of the volume of a calcification with a density of as function of threshold. The dotted lines indicate the physical volume and the proper threshold (160 HU).

Image of FIG. 3.
FIG. 3.

The proper threshold associated with the physical volume of a calcification as function of . The phantom measurements are shown by black circles and the computer simulations are shown as number of data points per area in a gray scale instead of individual data points. The left panel shows all results, whereas the right panel shows the results excluding homogeneous high density calcifications. The data are fitted to a linear fit for calcifications (black lines) and simulations (gray lines).

Image of FIG. 4.
FIG. 4.

[(a) and (b)] Agatston scores of the six different calcifications in phantom 3 with standard threshold (◻) and adjusted threshold (○).

Image of FIG. 5.
FIG. 5.

[(a) and (b)] Volume scores of the six different calcifications in phantom 3 with standard threshold (◻) and adjusted threshold (○). The gray lines represent the physical volumes of the calcifications.

Image of FIG. 6.
FIG. 6.

[(a) and (b)] Mass scores of the six different calcifications in phantom 3 with standard threshold (◻), adjusted threshold (○), and adjusted threshold combined with (△). The gray lines represent the physical volumes of the calcifications.

Image of FIG. 7.
FIG. 7.

CMS-indexes of scores with standard threshold (dark gray), scores with adjusted threshold (light gray), and scores with adjusted threshold and (white).

Image of FIG. 8.
FIG. 8.

-indexes of scores with standard threshold (dark gray), scores with adjusted threshold (light gray), and scores with adjusted threshold and (white).

Tables

Generic image for table
TABLE I.

Overview of the key terms used throughout the article.

Generic image for table
TABLE II.

Calcifications used in the first part of the study, establishing the threshold equation; calcification 17 shown in italic font was only used in the second part of the study.

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/content/aapm/journal/medphys/36/2/10.1118/1.3049590
2009-01-14
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Threshold adjusted calcium scoring using CT is less susceptible to cardiac motion and more accurate
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/36/2/10.1118/1.3049590
10.1118/1.3049590
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