Evaluation of a Chest Circumference-Adapted Protocol for Low-Dose 128-Slice Coronary CT Angiography with Prospective Electrocardiogram Triggering
Korean Journal of Radiology
;
: 13-20, 2015.
Artículo
en Inglés
| WPRIM
| ID: wpr-157431
ABSTRACT
OBJECTIVE:
To assess the effect of chest circumference-adapted scanning protocol on radiation exposure and image quality in patients undergoing prospective electrocardiogram (ECG)-triggered coronary CT angiography (CCTA). MATERIALS ANDMETHODS:
One hundred-eighty-five consecutive patients, who had undergone prospective ECG triggering CCTA with a 128-slice CT, were included in the present study. Nipple-level chest circumference, body weight and height were measured before CT examinations. Patients were divided into four groups based on kV/ref.mAs = 100/200, 100/250, 120/200, and 120/250, when patient's chest circumference was 95.0 (n = 32), respectively. Image quality per-segment was independently assessed by two experienced observers. Image noise and attenuation were also measured. Signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) were calculated. The effective radiation dose was calculated using CT dose volume index and the dose-length product.RESULTS:
A significant correlation was observed between patients' chest circumference and body mass index (r = 0.762, p < 0.001). Chest circumference ranged from 74 to 105 cm, and the mean effective radiation dose was 1.9-3.8 mSv. Diagnostic image quality was obtained in 98.5% (2440/2478) of all evaluated coronary segments without any significant differences among the four groups (p = 0.650). No significant difference in image noise was observed among the four groups (p = 0.439), thus supporting the validity of the chest circumference-adapted scanning protocol. However, vessel attenuation, SNR and CNR were significantly higher in the 100 kV groups than in the 120 kV groups (p < 0.05).CONCLUSION:
A measure of chest circumference can be used to adapt tube voltage and current for individualized radiation dose control, with resultant similar image noise and sustained diagnostic image quality.
Texto completo:
Disponible
Índice:
WPRIM (Pacífico Occidental)
Asunto principal:
Dosis de Radiación
/
Tomografía Computarizada por Rayos X
/
Índice de Masa Corporal
/
Estudios Prospectivos
/
Medios de Contraste
/
Electrocardiografía
/
Circunferencia de la Cintura
/
Relación Señal-Ruido
/
Corazón
/
Frecuencia Cardíaca
Tipo de estudio:
Guía de Práctica Clínica
/
Estudio observacional
Límite:
Adulto
/
Anciano
/
Femenino
/
Humanos
/
Masculino
Idioma:
Inglés
Revista:
Korean Journal of Radiology
Año:
2015
Tipo del documento:
Artículo
Similares
MEDLINE
...
LILACS
LIS