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In recent years some works have been done in the investigation of these waves broadband excitation using piezoelectric wafer active sensors (PWAS) -, evaluating such factors as the size of the element, selective excitation
and mode control schemes which are basically used in SHM applications.
PANalytical says the performance of the Epsilon 3 comes from selective excitation
and careful matching of the x-ray tube output to the capabilities of the detection system, together with "advanced spectrum processing and unique correction and quantification algorithms".
For those sequences for which SAR does affect the pulse sequence, other solutions may be applied, including parallel imaging to shorten echo trains (with a small reduction in optimal SNR), (9-11) and tailored RF pulse shapes or flip angles (variable-rate selective excitation
, hyperecho-turbo spin-echo, transition between pseudo steady-states).
Hence, the KR illumination leads to a strong selective excitation
in close proximity to the metal surface.