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Inicio Radiología (English Edition) Comparison of image quality and radiation dose in computed tomography angiograph...
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Vol. 56. Issue 6.
Pages 541-547 (November - December 2014)
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Vol. 56. Issue 6.
Pages 541-547 (November - December 2014)
Original article
Comparison of image quality and radiation dose in computed tomography angiography of the peripheral arteries using tube voltage of 80kV versus 100kV
Comparación de la calidad de imagen y dosis de radiación en angio-tomografía computarizada de arterias periféricas con 80 y 100kV
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R. Oca Pernas
Corresponding author
, C. Delgado Sánchez-Gracián, G. Tardáguila de la Fuente, A. Fernández del Valle, N. Silva Priegue, M. González Vázquez, C. Trinidad López
Servicio de Radiodiagnóstico, Hospital POVISA, Vigo, Pontevedra, Spain
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Table 1. Characteristics of patients and parameters of acquisition.
Table 2. Measurements of vascular density, subjective quality of image and radiation dose.
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Abstract
Objective

To compare the image quality and dose of radiation in two groups of patients undergoing CT angiography of the lower limbs, one with tube voltage of 80kV and the other with tube voltage of 100kV.

Materials and methods

We performed CT angiography of the lower limbs in 60 patients with suspected peripheral arterial disease. Patients were randomly assigned to one of the two groups; in one group, CT angiography was performed using a tube voltage of 80kV, whereas in the other it was performed using 100kV. The remaining acquisition parameters were the same in both groups. The images were analyzed by quantifying vascular density (VD) and noise (N) and by calculating the quotients density/noise (QVDN) and contrast/noise (QCN). Two radiologists working independently evaluated the subjective quality of the images. We calculated the estimated effective dose (EED) based on the dose-length product (DLP).

Results

In the group studied at 80kV, VD was significantly higher (462.5UH±95.6 vs 372UH±100.9; P<.001), QVDN was significantly higher (241.9±48.1 vs 194.3±49.6; P<.001), and there were trends toward higher N (21.3UH±13 vs 16.3UH±3.5; P=.098) and toward higher QCN (21.4±12.1 vs 22.9±9.1; P=.15). No significant differences were found in the subjective quality of the images. The EED was significantly lower in the group studied at 80kV (4.73mSv±1.1 vs 9.6mSv±2.2; P<.001).

Conclusion

Using 80kV instead of 100kV for CT angiography of the lower limbs reduces the dose of radiation without affecting the diagnostic efficacy of the study.

Keywords:
Peripheral arterial disease
Multidetector computed tomography
Dose of radiation
Resumen
Objetivo

Comparar la calidad de imagen y la dosis de radiación en 2 grupos de pacientes a los que se realiza angio-TC de extremidades inferiores con 80 y 100kV.

Material y métodos

Se realizó angio-TC de miembros inferiores a 60 pacientes con sospecha de enfermedad arterial periférica aleatorizados en 2 grupos, en uno la TC se realizó con 80kV y en el otro con 100kV. Los demás parámetros de adquisición se mantuvieron constantes. Se analizaron las imágenes cuantificando la densidad vascular (DV) y el ruido (R), y se calcularon los cocientes densidad vascular/ruido (CDVR) y contraste/ruido (CCR). Dos radiólogos evaluaron independientemente la calidad subjetiva de las imágenes. Se calculó la dosis efectiva estimada (DEE) basada en el producto dosis-longitud (DLP).

Resultados

El grupo de 80kV presentó valores significativamente más elevados de la DV (462,5UH±95,6 vs. 372UH±100,9; p<0,001) y del CDVR (241,9±48,1 vs. 194,3±49,6; p<0,001) y diferencias no significativas del R (21,3UH±13 vs. 16,3UH±3,5; p=0,098) y el CCR (21,4±12,1 vs. 22,9±9,1; p=0,15). No hubo diferencias significativas en la calidad subjetiva de la imagen y la dosis efectiva fue significativamente menor en el grupo de 80kV (4,73mSv±1,1 vs. 9,6mSv±2,2; p<0,001).

Conclusión

La utilización de 80kV en el estudio de angio-TC de miembros inferiores disminuye la dosis de radiación sin afectar a la eficacia diagnóstica del estudio respecto a la utilización de 100kV.

Palabras clave:
Enfermedad arterial periférica
Tomografía computarizada multidetector
Dosis de radiación

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