品名：ats 538n 波束轮廓和切片厚度模体 型号：ats 538n 厂家： www.atslaboratories-pha, ats laboratories, incorporated product description the phantom contains a thin plane of echogenic material embedded in a non-echoic rubber-based tissue-mimicking matrix. model 538n-h has two scan planes. the scattering plane is oriented at 45° to one scan plane and perpendicular to the other. the beam profile is easily displayed at varying depths, and contains a great deal of information regarding the configuration of the sound beam as it propagates through the tissue-mimicking media. the beam profile clearly displays the near field, focal length, focal zone, beam width, side and grating lobes and beam divergence in the far field. in addition, amplitude variations in the near field are displayed as varying degrees of brightness versus the almost homogeneity of the amplitude in the far field. the model 538n-h provides a means of evaluating the slice thickness of an imaging system at varying depths. slice thickness or elevational resolution, the third component of spatial resolution, displays reflections produced by structures in front of or behind the beam’s main axis. the effect of changes in the slice thickness is identical to those seen with axial and lateral resolution. the thinner the slice thickness the better the resolution; as the slice thickness increases, the degree of spatial resolution decreases. lifetime warranty. tests performed beam profile slice thickness image uniformity tissue harmonic imaging compatibility uses: quality assurance final q.a. inspection research & development in-process manufacturing teaching specifications general overall dimensions: 25 x 22 x 7 cm scan surfaces: 3 weight: 3.4 kg tissue mimicking material: urethane rubber freezing point: 100°c attenuation coefficient: 0.5 db/cm/mhz ± 5.0% speed of sound: 1450 m/s ±1.0% at 23° targets scattering plane oriented at 45° to the scan planes used to measure slice thickness, and 90° to the beam profile scan plane size: 26 x 7 cm depth: 0 to 22 cm ***lifetime warranty***