Acuson s2000 us system

Virtual Touch™ quanti cation (VTQ; Siemens Healthineers AG, Erlangen, Germany) has been used for acoustic radiation force impulse-based shear wave elastography (SWE) in our hospital since October 2012. VTQ elastography was therefore performed as additional analysis in all consenting patients. Shear wave velocity (Vs) was measured 6 times with an ACUSON S2000 US system (Siemens Healthineers AG), and the median value (m/s) was calculated. [12] [13] [14] We analyzed the correlation between median Vs and ROR range. platelets [10 9 /L] × (ALT [U/L] / 2)) was calculated. 15 The AST/ALT ratio was examined because it is reported to be associated with progression of chronic liver disease 16 and PBC 17 .

US and SWE of the parathyroid lesions and lymph nodes were performed by a radiologist (A.V.P) with 19 years of experience in US and 5 years of experience in elastography. The examinations were performed using the Siemens ACUSON S2000 US system (Siemens Medical Solution, Mountain View, CA, USA) with a 9L4 multi-D probe. All subjects were positioned supine with the neck slightly extended. During B-mode examination, the size and location of lesions were noted. For SWE examination, the transducer was vertically placed on the skin surface with an adequate amount of gel, and a VTIQ color map was obtained without applying any pressure to the probe to avoid the compression effect. The subjects were also told to hold their breath during image acquisition to minimize breathing artifacts. A 2D elastography color map was displayed on the screen, and five small ROI boxes randomly were placed within the lesion (fig 1 ,fig 2). Lesion stiffness was expressed as the mean SWV of the five measurements; this mean value was used for statistical analysis. Shear wave quality maps were also obtained for each VTIQ examination; on these maps, high-quality regions were displayed as green, low-quality regions were displayed as orange, and marginal-quality regions were displayed as yellow [15] . All ROI boxes were placed within the green areas on the shear wave quality map.