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Inicio Radiología (English Edition) Dual-energy computed tomography for the detection of focal liver lesions
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Vol. 59. Issue 4.
Pages 306-312 (July - August 2017)
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Vol. 59. Issue 4.
Pages 306-312 (July - August 2017)
Original Report
DOI: 10.1016/j.rxeng.2017.06.004
Dual-energy computed tomography for the detection of focal liver lesions
Tomografía computada de doble energía para la detección de lesiones focales hepáticas
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K.N. Lago, J. Vallejos, C. Capuñay, E. Salas, E. Reynoso, J.B. Carpio, P.M. Carrascosa
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Departamento de Tomografía Computada, Diagnóstico Maipú, Buenos Aires, Argentina
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Table 1. Paired differences of HU averages between avascular, hypovascular, and hypervascular lesions and the adjacent liver parenchyma in virtual spectral polychromatic and monochromatic portal phase at a 40, 70 and 140keV. Contrast-to-noise ratios are included.
Table 2. Dual-energy index in portal phase based on the type of lesion.
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Abstract
Objective

To qualitatively and quantitatively explore the spectral study of focal liver lesions, comparing it with the usual polychromatic assessment with single-energy computed tomography.

Material and methods

We prospectively studied 50 patients with at least one focal liver lesion who were referred for abdominal multidetector computed tomography with intravenous contrast material. The portal phase was acquired with dual energy sources. The density of the lesions and of the surrounding liver parenchyma was measured both in the baseline polychromatic acquisition and in the posterior monochromatic reconstructions at 40keV, 70keV, and 140keV. Spectral curves were traced and the dual-energy indices and contrast-to-noise ratio were calculated. Lastly, the quality of the images and the detectability of the lesions were assessed qualitatively.

Results

Densitometric differences between the different types of lesions (avascular and vascularized) and the liver were greater at low energy levels (left side of the spectral curve) than in the polychromatic evaluation. In the subjective assessment, the 40keV energy level had the greatest lesion detectability.

Conclusions

Monochromatic spectral study with dual-energy computed tomography provides better lesion detectability at 40keV compared to that provided by the ordinary polychromatic evaluation.

Keywords:
Spectral computed tomography
Abdomen
Diagnosis
Dual energy
Resumen
Objetivo

Explorar cualitativamente y cuantitativamente el estudio espectral de las lesiones focales hepáticas, comparándolo con la valoración policromática habitual de la tomografía de energía simple.

Mèc)todo

El presente estudio prospectivo incluyó 50 pacientes remitidos para la realización de tomografía computada multidetector abdominal con contraste intravenoso, que tuvieran al menos una lesión focal hepática. La fase portal fue adquirida con energía dual. Se realizaron mediciones densitomèc)tricas de las lesiones y del parèc)nquima hepático circundante, tanto en la adquisición policromática basal como en las posteriores reconstrucciones monocromáticas a 40, 70 y 140 keV. Se trazaron las curvas espectrales y se calcularon los índices de doble energía y la relación contraste-ruido. Por último, se hizo una valoración subjetiva de la calidad de las imágenes y la detectabilidad lesional.

Resultados

Las diferencias densitomèc)tricas entre los distintos tipos de lesiones (avasculares y vascularizadas) y el hígado fueron mayores a bajos niveles energèc)ticos (a la izquierda de la curva espectral) que en la evaluación policromática. En la valoración subjetiva, el nivel energèc)tico de 40keV presentó una mayor detectabilidad lesional.

Conclusiones

El estudio espectral monocromático mediante tomografía computada de energía dual provee una mayor detectabilidad lesional a 40keV en relación a la que se dispone con la valoración policromática habitual.

Palabras clave:
Tomografía espectral
Abdomen
Diagnóstico
Energía dual

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