High-Definition Computed Tomography for Coronary Artery Stent Imaging: a Phantom Study
Korean Journal of Radiology
;
: 20-26, 2012.
Artículo
en Inglés
| WPRIM
| ID: wpr-28659
ABSTRACT
OBJECTIVE:
To assess the performance of a high-definition CT (HDCT) for imaging small caliber coronary stents (< or = 3 mm) by comparing different scan modes of a conventional 64-row standard-definition CT (SDCT). MATERIALS ANDMETHODS:
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 (AVin-stent) and the in-vessel extra-stent attenuation value (AVin-vessel) were measured by two observers. The artificial lumen narrowing (ALN = [ISD - ISDmeasured]/ISD) and artificial attenuation increase between in-stent and in-vessel (AAI = AVin-stent - AVin-vessel) were calculated. All data was analyzed by intraclass correlation and ANOVA-test.RESULTS:
The correlation coefficient of ISD, AVin-vessel and AVin-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 (< or = 3 mm).
Texto completo:
Disponible
Índice:
WPRIM (Pacífico Occidental)
Asunto principal:
Dosis de Radiación
/
Interpretación de Imagen Radiográfica Asistida por Computador
/
Stents
/
Análisis de Varianza
/
Fantasmas de Imagen
/
Enfermedad Coronaria
/
Tomografía Computarizada Espiral
/
Técnicas de Imagen Sincronizada Cardíacas
Límite:
Humanos
Idioma:
Inglés
Revista:
Korean Journal of Radiology
Año:
2012
Tipo del documento:
Artículo
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