... strictly under the national standards GB 10152-1997 about “B-type Ultrasonic Diagnostic Device” GB 9706.1-2007 about “Medical ... -Gray scale: 256 levels;-Cine Loop: 64 frames;-Imaging mode: B, B/B, B/M; -Image invert: horizontally invertible;-Time Gain Compensation (TGC): ... FL, CRL, HC, AC, gestation age, fetal weight; USB B-type ultrasonic scanner (new products, high quality, creative design)