Analyzer · Sparsifire

Analyze how specific documents activate the features of the SAE. Select a dataset, a run and a document to begin.

Dataset

SAE Model

Document

Active Features

1524

MIN ACTIVATION

0.0

Details List

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Document Content

A method for coronary artery calcium scoring using contrast-enhanced computed tomography.
Limitations to the coronary calcium score include its requirement for noncontrast imaging and radiation exposure that approaches current methods for contrast-enhanced CT angiography. We sought to derive and validate a method of measuring the coronary artery calcium score (CACS) from standard contrast-enhanced CT, obviating the need for a second non-contrast calcium scan. The volume of intramural calcium of >320 HU in major coronary vessels was measured in 90 contrast-enhanced and traditional non-contrast calcium scan pairs. An empiric conversion factor was derived to convert the small voxel contrast-enhanced calcium volume to an Agatston calcium score. The accuracy of this technique was then prospectively validated in 120 consecutive patients undergoing clinical calcium scans and contrasted-enhanced coronary CT. Eleven patients were excluded from analysis because of the prespecified criteria of excessive noise in the contrast-enhanced CT or total coronary artery occlusion. The Pearson correlation of the contrast scan-derived calcium score with the measured CACS was r2 = 0.99. With standard CACS risk bands, agreement of the contrast-enhanced calcium score estimate with the measured CAC by quadratic weighted κ was 0.96. The 95% limits of agreement (Agatston units) were given by ±(3.2 + 0.14 × CACS + 4.44 mean square root of CACS). Inter-observer and intra-observer reliability with the intraclass correlation was 0.99. The calcium score can be accurately measured from contrast-enhanced cardiac CT scans with the use of a Hounsfield unit threshold of 320.

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