UGAP và CAP định lượng gan thấm mỡ

 

UGAP measurements UGAP measurements were performed using a LOGIQ E10 ultrasound machine (GE Healthcare, Wauwatosa, WI, USA), using a C1-6-D convex array probe. All measurements were performed in fasting conditions for more than 4 hours, on patients in a supine position, with the right arm in maximum abduction, by intercostal approach, in the right liver lobe. A large colored-coded attenuation map, automatically adjusted by the system, was positioned in the right liver lobe, in a homogenous area of the liver, free of large vessels (fig1). Using the quality map option, the best image was selected in order to acquire the attenuation coefficient measurement. Ten measurements were performed using one or two selected images of the liver and the values were automatically stored in the system. Reliable UGAP measurements were defined as the median value of 10measurements performed in a homogeneous area of liver parenchyma, with an IQR/M <0.30. UGAP values are expressed in dB/cm/ MHz or in dB/m. LOGIQ E10 ultrasound machine can also perform liver stiffness measurements for fibrosis evaluation using an accurate 2D-Shear Wave Elastography (2D-SWE) technique [20-23], but this type of evaluation was not included in the present study.