Corresponding national standard "B-mode ultrasound diagnostic equipment" (GB10152-2009) Revision, in addition to the diffuse target standards, but also absorb the latest international research results and practical experience in this regard, the addition of a line of target group, whose role includes: (a) is used to determine the reference threshold gain status, so that the slice thickness and axial, lateral resolution of the same measurement conditions, constitute a complete set of the data set; (b) provide a cross-section of the beam pitch direction picture; (c) to check the surface of the target is read by the slice thickness values. Specific technical indicators: Ultrasound imitation tissue material velocity: 1540 m / s ultrasonic sound attenuation material imitation organization: (0.7 ± 0.05) dB / cm / MHz plane scattering target slice thickness: <0.4 mm surface acoustic window - diffuse target folder angle: 70 ° target lines: 19 target wire diameter: (0.3 ± 05) mm wire target position tolerance: ± anterior and posterior angles red marker line on ultrasound phantom shell 0.1mm surface acoustic window: 70 °