1. TM material sound speed: 1540 ± 10m/s (23 ± 3 ℃)
2. TM material sound attenuation coefficient slope: 0.70 ± 0.05dB/cm/MHz (23 ± 3 ℃)
3. Nylon target wire diameter: 0.3 ± 0.05mm
4. Nylon target line position tolerance: ± 0.1mm
Axial resolution target group: The top target line in each group is located at depths of 10, 30, 50, and 70mm. The vertical distance from the center of the target line in each group is 3, 2, 1, and 0.5mm from top to bottom, with a horizontal distance of 1mm.
Lateral resolution target groups: located at depths of 10, 30, 50, and 70mm, with horizontal distances of 4, 3, 2, and 1mm from the center of the target line in each group.
Blind spot target group: The horizontal spacing between adjacent target lines is 10mm, and the distances to the sound window are 8, 7, 6, 5, 4, 3, and 2mm, respectively.
Longitudinal target group: There are a total of 12 target lines, with a center distance of 10mm between adjacent lines.
Horizontal target group: located at a depth of 40mm, with a center distance of 10mm between adjacent lines.
Simulated lesions: TM material is embedded with 3 cystic simulated lesions, all of which are cylindrical in shape, with diameters of 2, 4, and 6mm respectively. The column axes are parallel to the target line, and the axes are located at depths of 15, 30, and 45mm.
