New backlit optical trace ball Application: diagnosis of abdomen, heart, thyroid, liver, kidney, spleen,bladder and the field of OB/GYN Scanning depth (mm):>=160 Depth Scope (mm):0~240 Resolution (mm): horizontal resolution <=3 (depth<=80), <=4 (80 Vertical resolution <=2 (depth<=80), <=3 (80 Blind area (mm): <=5 Gray scale: 256 Dynamic range: 64~96db Magnification:*0.8, *1.0, *1.2, *1.5, *1.8, *2.0, and Partial Zoom. 8 segment TGC adjustment Cine loop: 128-frame cine loop memory; Electronic focusing: dynamic receiving focusing Frame correlation:4 segments frame correlation (B, B+B, 4B) Line correlation:4 segments line correlation (B, B+B, 4B) Dot correlation:4 segments dot correlation (B, B+B, 4B) Image turning:left/right reverse, black/white reverse, up/down reverse Measurement& calculation: distance, circumference, area, volume and heart rate B/GYN software package (BPD, GS, CRL, FL, AC and embryo weight, automatically calculating the expected date of childbirth (EDC) and gestational weeks Character input/display:time, date, patients ID, age, gender, panoramic word process Body marks: 32