The CIRS series of ultrasound phantoms, unlike human subjects or random scannable materials, offers a reliable medium which contains specific, known test objects for repeatable qualitative assessment of ultra sound scanner performance over time.

At normal or room temperatures the Zerdine^®(1) material found in the Near Field phantom will accurately simulate the ultrasound characteristics found in human tissue.

The Model 050 has a series of wire targets that will appear as bright dots or lines on the ultrasound image. These targets are made from stainless steel with a diameter of 0.10 mm and a positional accuracy of ± 0.2 mm. There are also two known volumes, a 10 mm anechoic/+15 dB mass and anechoic focal lesions embedded within the phantom. These "masses" are made from Zerdine^® that has a different contrast and attenuation relative to the background material.

The Model 050 was designed to allow for assessment of uniformity, dead zone, depth of penetration, beam profile/focal zone/lateral response width, vertical distance measurement accuracy, axial resolution, lateral resolution, anechoic masses, high contrast masses, volumetric measurement accuracy, and focal lesion detectability.

Model 050 Specifications:

• Material: Zerdine^®(1), solid elastic water-based
• polymer Freezing Point: 00 C Melting Point: Above 1000 C
• Attenuation Coefficient: 0.5 dB/cm/MHz Speed of
• Sound: 1540 m/s
• Scanning Well: 165 mm X 100 mm X 1.5 cm
• Scanning Membrane: Saran-based laminate

Targets:
• Material: Stainless Steel Wire
• Diameter: 0.1 mm

Vertical Plane Targets:
• Depth Range: 8 cm
• Spacing: 1 cm

Resolution Targets:
• Number of Arrays: 2

Ring Down Target:
• 1 mm to 10 mm

Volumetric Test Object:
• Calibrated asymmetric shape 7 cc and 21 cc

Spherical Cysts:
• Diameter: 5 mm, 3 mm Random Distribution.

High Contrast/Cystic:
• Cylinder: Diameter 10 mm
• Depth: 1.0 cm
• Contrast: HSdB/anechoic
• Depths: 1.5 cm and 2 cm
• Axial Intervals: 0.5, 1 , 2, 3, 4, and 5 mm
• Horizontal Intervals: 1, 2, 3, 4, and 5 mm