Variability of Repeated Coronary Artery Calcium Measurements by 16-MDCT with Retrospective Reconstruction
Jun Horiguchi1,
Hideya Yamamoto2,
Yuji Akiyama1,
Nobuhiko Hirai1,
Kazushi Marukawa3,
Hiroshi Fukuda1 and
Katsuhide Ito3
1 Department of Clinical Radiology, Hiroshima University Hospital, 1-2-3,
Kasumi-cho, Minami-ku, Hiroshima 734-8551, Japan.
2 Department of Molecular and Internal Medicine, Division of Clinical Medical
Science, Programs for Applied Biomedicine, Graduate School of Biomedical
Sciences, Hiroshima University, Hiroshima, Japan.
3 Department of Radiology, Division of Medical Intelligence and Informatics,
Programs for Applied Biomedicine, Graduate School of Biomedical Sciences,
Hiroshima Univerisity, Hiroshima, Japan.
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Fig. 1A. —Scatterplots of Agatston scores for scans 1 and 2 for
electron beam CT (EBCT) and for three MDCT protocols. Scatterplot of Agatston
scores for EBCT shows linear correlation follows an equation: scan 2 = 51.3 +
0.86 x scan 1 (r2 = 0.961).
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Fig. 1B. —Scatterplots of Agatston scores for scans 1 and 2 for
electron beam CT (EBCT) and for three MDCT protocols. Scatterplot of Agatston
scores for 1.25-mm MDCT shows linear correlation follows an equation: scan 2 =
-3.0 + 1.05 x scan 1 (r2 = 0.966).
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Fig. 1C. —Scatterplots of Agatston scores for scans 1 and 2 for
electron beam CT (EBCT) and for three MDCT protocols. Scatterplot of Agatston
scores for 2.5 mm/2.5 mm MDCT shows linear correlation follows an equation:
scan 2 = -0.8 + 1.06 x scan 1 (r2 = 0.981).
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Fig. 1D. —Scatterplots of Agatston scores for scans 1 and 2 for
electron beam CT (EBCT) and for three MDCT protocols. Scatterplot of Agatston
scores for 2.5 mm/1.25 mm MDCT shows linear correlation follows an equation:
scan 2 = -22.1 + 1.08 x scan 1 (r2 = 0.991).
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Fig. 2A. —44-year-old asymptomatic man (heart rate, 68 beats per
minute). Transaxial images from first electron beam CT (EBCT) (A),
first 1.25-mm-thickness MDCT (B), and first 2.5-mm-thickness MDCT show
heart. Calcium is not detected on EBCT and 2.5-mm-thickness MDCT. Calcium in
left main coronary artery is detected on 1.25-mm-thickness MDCT.
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Fig. 2B. —44-year-old asymptomatic man (heart rate, 68 beats per
minute). Transaxial images from first electron beam CT (EBCT) (A),
first 1.25-mm-thickness MDCT (B), and first 2.5-mm-thickness MDCT show
heart. Calcium is not detected on EBCT and 2.5-mm-thickness MDCT. Calcium in
left main coronary artery is detected on 1.25-mm-thickness MDCT.
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Fig. 2C. —44-year-old asymptomatic man (heart rate, 68 beats per
minute). Transaxial images from first electron beam CT (EBCT) (A),
first 1.25-mm-thickness MDCT (B), and first 2.5-mm-thickness MDCT show
heart. Calcium is not detected on EBCT and 2.5-mm-thickness MDCT. Calcium in
left main coronary artery is detected on 1.25-mm-thickness MDCT.
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Fig. 3A. —69-year-old man complaining of anterior chest pain (heart
rate, 55 beats per minute). Transaxial images from first electron beam CT
(EBCT) (A), second EBCT (B), first 1.25-mm-thickness MDCT
(C), second 1.25-mm-thickness MDCT (D), first 2.5-mm-thickness
MDCT (E), and second 2.5-mm-thickness MDCT (F) show heart.
Calcium in right coronary artery is most clearly seen on 1.25-mm-thickness
MDCT. On EBCT, calcium is detected on first scan and is not detected on second
scan.
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Fig. 3B. —69-year-old man complaining of anterior chest pain (heart
rate, 55 beats per minute). Transaxial images from first electron beam CT
(EBCT) (A), second EBCT (B), first 1.25-mm-thickness MDCT
(C), second 1.25-mm-thickness MDCT (D), first 2.5-mm-thickness
MDCT (E), and second 2.5-mm-thickness MDCT (F) show heart.
Calcium in right coronary artery is most clearly seen on 1.25-mm-thickness
MDCT. On EBCT, calcium is detected on first scan and is not detected on second
scan.
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Fig. 3C. —69-year-old man complaining of anterior chest pain (heart
rate, 55 beats per minute). Transaxial images from first electron beam CT
(EBCT) (A), second EBCT (B), first 1.25-mm-thickness MDCT
(C), second 1.25-mm-thickness MDCT (D), first 2.5-mm-thickness
MDCT (E), and second 2.5-mm-thickness MDCT (F) show heart.
Calcium in right coronary artery is most clearly seen on 1.25-mm-thickness
MDCT. On EBCT, calcium is detected on first scan and is not detected on second
scan.
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Fig. 3D. —69-year-old man complaining of anterior chest pain (heart
rate, 55 beats per minute). Transaxial images from first electron beam CT
(EBCT) (A), second EBCT (B), first 1.25-mm-thickness MDCT
(C), second 1.25-mm-thickness MDCT (D), first 2.5-mm-thickness
MDCT (E), and second 2.5-mm-thickness MDCT (F) show heart.
Calcium in right coronary artery is most clearly seen on 1.25-mm-thickness
MDCT. On EBCT, calcium is detected on first scan and is not detected on second
scan.
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Fig. 3E. —69-year-old man complaining of anterior chest pain (heart
rate, 55 beats per minute). Transaxial images from first electron beam CT
(EBCT) (A), second EBCT (B), first 1.25-mm-thickness MDCT
(C), second 1.25-mm-thickness MDCT (D), first 2.5-mm-thickness
MDCT (E), and second 2.5-mm-thickness MDCT (F) show heart.
Calcium in right coronary artery is most clearly seen on 1.25-mm-thickness
MDCT. On EBCT, calcium is detected on first scan and is not detected on second
scan.
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Fig. 3F. —69-year-old man complaining of anterior chest pain (heart
rate, 55 beats per minute). Transaxial images from first electron beam CT
(EBCT) (A), second EBCT (B), first 1.25-mm-thickness MDCT
(C), second 1.25-mm-thickness MDCT (D), first 2.5-mm-thickness
MDCT (E), and second 2.5-mm-thickness MDCT (F) show heart.
Calcium in right coronary artery is most clearly seen on 1.25-mm-thickness
MDCT. On EBCT, calcium is detected on first scan and is not detected on second
scan.
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Fig. 4A. —69-year-old obese man complaining of anterior chest pain
(heart rate, 60 beats per minute). Transaxial electron beam CT (EBCT) image
(A), transaxial 1.25-mm-thickness MDCT image (B), and transaxial
2.5-mm-thickness MDCT image (C) show heart. SDs of CT values in region
of interest placed in aortic root were measured as 39, 42, and 30 H on EBCT
and 1.25- and 2.5-mm-thickness MDCT, respectively. No apparent calcium is
found in left coronary artery region. However, hyperdense noise exceeds CT
value of 130 H on EBCT and 1.25-mm-thickness MDCT.
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Fig. 4B. —69-year-old obese man complaining of anterior chest pain
(heart rate, 60 beats per minute). Transaxial electron beam CT (EBCT) image
(A), transaxial 1.25-mm-thickness MDCT image (B), and transaxial
2.5-mm-thickness MDCT image (C) show heart. SDs of CT values in region
of interest placed in aortic root were measured as 39, 42, and 30 H on EBCT
and 1.25- and 2.5-mm-thickness MDCT, respectively. No apparent calcium is
found in left coronary artery region. However, hyperdense noise exceeds CT
value of 130 H on EBCT and 1.25-mm-thickness MDCT.
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Fig. 4C. —69-year-old obese man complaining of anterior chest pain
(heart rate, 60 beats per minute). Transaxial electron beam CT (EBCT) image
(A), transaxial 1.25-mm-thickness MDCT image (B), and transaxial
2.5-mm-thickness MDCT image (C) show heart. SDs of CT values in region
of interest placed in aortic root were measured as 39, 42, and 30 H on EBCT
and 1.25- and 2.5-mm-thickness MDCT, respectively. No apparent calcium is
found in left coronary artery region. However, hyperdense noise exceeds CT
value of 130 H on EBCT and 1.25-mm-thickness MDCT.
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