Keywords:
Cardiovascular system, CT, Acceptance testing, Arteriosclerosis
Authors:
N. Matsuura1, W. Yamasaki2, K. Awai3; 1Hiroshima City/JP, 2Horoshma/JP, 3Hiroshima/JP
DOI:
10.1594/ecr2013/C-0892
Methods and Materials
We enrolled 65 patients with suspected coronary artery disease.
We obtained two consecutive scans for CACS.
One was acquired at the normal tube current with FBP reconstruction and the other was at a low tube current with strong IR.
Scan details are shown in the table 1.
Among them we extracted the 34 patients with no motion artifact in both CAC scan and performed the CACS with Agatston,
volume and mass methods.
Then we calculated the percentage difference between FBP and IR. Percentage difference was defined as the formula, |FBP - IR| / (0.5*FBP + 0.5*IR) (%). Finally we performed Bland-Altman analysis to assess the interchangeability between FBP with normal tube current and IR with low tube current. In Bland-Altman analysis,
data were log transformed to reduce the skewness.