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Table 3 MRI parameters between normal vs increased CTR and CTR correlation with cardiac MRI parameters

From: Limitations of cardiothoracic ratio derived from chest radiographs to predict real heart size: comparison with magnetic resonance imaging

MRI parameter CTR ≤ 50 (N = 194) CTR > 50 (N = 115) CMR and CTR correlation
LVEDVi (ml/m2) 89 (76–106) 110 (86–139) 0.367 (p < 0.005)
LVEF (%) 54 (42.5–61) 42 (29–55) − 0.341 (p < 0.005)
Indexed LV mass (mg/m2) 68 (60–78.5) 80 (66–98) 0.319 (p < 0.005)
RVEDVi (ml/m2) 75 (64–89) 84 (66–102) 0.170 (p < 0.005)
RVEF (%) 58 (53–63) 54 (41–59) − 0.241 (p < 0.005)
Indexed LA volume (ml/m2) 40 (32–50) 56 (40–75) 0.389 (p < 0.005)
Indexed LA area (cm2/m2) 13 (10–15) 15 (12–18) 0.360 (p < 0.005)
Indexed RA volume (ml/m2) 33.5 (27–42.5) 40 (31–58) 0.247 (p < 0.005)
Indexed RA area (cm2/m2) 11 (9–12) 12 (10–15) 0.249 (p < 0.005)
  1. Values in the two middle columns are median (interquartile range), and values in the far-right column are correlation coefficients
  2. MRI magnetic resonance imaging, CTR cardiothoracic ratio, LVEDVi left ventricular indexed end-diastolic volume, LVEF left ventricular ejection fraction, LV left ventricle, RVEDVi right ventricular indexed end-diastolic volume, RVEF right ventricular ejection fraction, LA left atrium, RA right atrium