High-definition computed tomography for coronary artery stent imaging: a phantom study.

Korean J Radiol

Department of Radiology, Rui Jin Hospital, Medical School, Shanghai Jiao Tong University, Shanghai 200025, PR China.

Published: May 2012

AI Article Synopsis

  • - The study aimed to evaluate the effectiveness of high-definition CT (HDCT) for imaging small coronary stents (≤ 3 mm) compared to conventional standard-definition CT (SDCT) using different scanning methods.
  • - Results showed that HDCT produced lower artificial lumen narrowing (ALN) and artificial attenuation increase (AAI) values than SDCT, indicating improved accuracy in measurement.
  • - The findings suggest that using HDCT with a 100 kVp prospective ECG-triggered axial technique may provide more accurate imaging of small caliber coronary stents while reducing radiation exposure.

Article Abstract

Objective: To assess the performance of a high-definition CT (HDCT) for imaging small caliber coronary stents (≤ 3 mm) by comparing different scan modes of a conventional 64-row standard-definition CT (SDCT).

Materials And Methods: A cardiac phantom with twelve stents (2.5 mm and 3.0 mm in diameter) was scanned by HDCT and SDCT. The scan modes were retrospective electrocardiography (ECG)-gated helical and prospective ECG-triggered axial with tube voltages of 120 kVp and 100 kVp, respectively. The inner stent diameters (ISD) and the in-stent attenuation value (AV(in-stent)) and the in-vessel extra-stent attenuation value (AV(in-vessel)) were measured by two observers. The artificial lumen narrowing (ALN = [ISD - ISD(measured)]/ISD) and artificial attenuation increase between in-stent and in-vessel (AAI = AV(in-stent) - AV(in-vessel)) were calculated. All data was analyzed by intraclass correlation and ANOVA-test.

Results: The correlation coefficient of ISD, AV(in-vessel) and AV(in-stent) between the two observers was good. The ALNs of HDCT were statistically lower than that of SDCT (30 ± 5.7% versus 35 ± 5.4%, p < 0.05). HDCT had statistically lower AAI values than SDCT (15.7 ± 81.4 HU versus 71.4 ± 90.5 HU, p < 0.05). The prospective axial dataset demonstrated smaller ALN than the retrospective helical dataset on both HDCT and SDCT (p < 0.05). Additionally, there were no differences in ALN between the 120 kVp and 100 kVp tube voltages on HDCT (p = 0.05).

Conclusion: High-definition CT helps improve measurement accuracy for imaging coronary stents compared to SDCT. HDCT with 100 kVp and the prospective ECG-triggered axial technique, with a lower radiation dose than 120 kVp application, may be advantageous in evaluating coronary stents with smaller calibers (≤ 3 mm).

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3253399PMC
http://dx.doi.org/10.3348/kjr.2012.13.1.20DOI Listing

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