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Ultrasound image quality is in part a function of transducer frequency but also of transducer and machine design [ 7].
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A study of MR and B-mode US image signal-to-noise ratio (SNR) as a function of transducer-phantom separation was performed using a gel phantom.
The apparent eccentricity of the gel sample due to spatial distortion is plotted as a function of transducer-sample separation in Figure 11.
SNR data from B-mode images, plotted as a function of transducer-sample separation in Figure 10(b), indicate that the chosen distance is important for US, as well as MR, imaging.
The smallest contrast increment (in the region of the dipper) is required at a pedestal contrast corresponding to the steepest part of transducer function.
For a multiway loudspeaker system, such as that one shown in Figure 1, we introduce the following notations: (i) : transfer function of the transducer measured at a listening point, one meter away from the top transducer (generally reproducing the high frequencies: tweeter); (ii) : transfer function of the crossover filter applied to the transducer.
A very strong dependence of sonochemical reactivity as a function of the transducer design is put into evidence.
Of course, it was not possible to directly measure the applied radial axis load because that was the novel function of the transducer.
The measured transmission, recorded on a logarithmic scale, is normalized to its maximum and corrected by an envelope function of the transducer response.
The interplay between advective and diffusive ion transport of electrochemically generated ions is analyzed as a function of the transducer duty cycle and electrode location.
For better understanding of the function of amperometric transducer, electroactive materials of three concentrations were used: (1) relevant for blood serum, (2) 20-fold lower than (1), i.e. 20-fold dilution, and (3) 100-fold dilution.
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