Download High or Standard Definition Computed Tomography for Coronary

High or Standard Definition Computed Tomography for
Coronary Artery Imaging: an in-vivo study
Poster No.:
C-0564
Congress:
ECR 2013
Type:
Scientific Exhibit
Authors:
A. Akta#, Ö. Y#lmaz, M. Kayan, B. De#irmenci, M. Koroglu, M.
Çetin; Isparta/TR
Keywords:
Computer Applications-Detection, diagnosis, CT-High Resolution,
CT-Angiography, CT, Computer applications, Cardiovascular
system, Cardiac, Artifacts
DOI:
10.1594/ecr2013/C-0564
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Purpose
The purpose of this study was to compare a high-definition CT (HDCT) with a
conventional 64-row standard-definition CT (SDCT) angiography as to radiation dose,
image quality, accuracy of vessel diameter measurement for imaging small caliber
coronary arteries in vivo.
Images for this section:
Fig. 1: Coronary artery diameter measurement from inner portion of artery wall.
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Fig. 2: Coronary artery diameter measurement from outer portion of artery wall.
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Fig. 3: Statistics of high and standart definition CT measurements.
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Methods and Materials
28 patients from different University hospitals with history of coronary artery disease has
singed the informed concent form and scanned by HDCT (Discovery CT750 HD) and
SDCT (Somatom Definition AS). Totally 280 measurements from 140 coronary arteries
were analyzed by 2 independent radiologist.The scan modes were bothaxial prospective
ECG-triggered. The vessel diameters of ascending aorta(AA), left main coronary artery
(LM), left anterior decending coronary artery (LAD), left circumflex artery(Cx), rigth
coronary artery (RCA) and vessel attenuation valuesof each were measured by two
experienced radiologists. The luminal diameter obtained at the proximal portions of each
coronary vessels and the mean luminal diameters were also calculated. All data were
analyzed by intraclass correlation test. Image quality graded by motion and stairstep
artifacts (grade 1, poor, to grade 4, excellent), accuracy of vessel inner and outer
diameters were compared between the two CT units using the independent samples ttest and Mann-Whitney U test.
Results
The intraclass correlation coefficient (ICC) of measured vessel attenuation values in
SDCT between the two radiologists was very good. The ICC was higher in HDCT
according to inner and outer diameters of Cx, LAD and also outer diameters of LM. But
ICC was higher in SDCT according to inner and outer diameters of AA and RCA.
First radiologist image quality score and the attenuation value measurements are higher
than second radiologist in HDCT and visa versa for SDCT. The radiation dose of high
definition CT angiography (HDCTA) (14,3 mSv) was higher than that of SDCTA (6,5 mSv)
when the mean tube current was 180 (mA) in HDCT and 147(mA) in SDCT with the same
tube voltage (kVp). CTA images were assigned a satisfactory image quality rating as 3
by both radiologists in stable heart rate up to 75 beats per minute (bpm) when using the
minimal X-ray exposure time.
Conclusion
On the basis of this in vivo study, HDCT has a higher radiation dose than SDCT but has
much more atenuation and the spatial resolution which improve measurement accuracy
for imaging coronary arteries.
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Personal Information
Aykut Recep Aktas, MD, Department of Radiology,
Süleyman Demirel University Faculty of Medicine, Isparta Turkey. Tel: 090(246)
2112050,
Email: [email protected]
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