Experimental point spread function of FM pulse imaging scheme
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Date
1995Author
Rao, Navalgund
Mehra, Sumat
Bridges, J.
Venkatraman, S.
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In this paper, we have examined the possibility of incorporating pulse
compression techniques into a conventional medical B-scan imaging scheme.
Linear frequency modulation fm, one form of pulse coding among many
others, has been used in this study. With this approach, one can overcome
current peak intensity limitations. A theoretical framework that includes
medium propagation effects, transducer bandwidth and diffraction effects is
presented, which could be used to examine the system point spread function
under this imaging scheme. A prototype experimental set-up and signal
processing are described and used for simple imaging tasks in attenuating and
non attenuating media. Analysis of the experimental point spread functions
shows that resolution similar to conventional short pulse imaging can be
achieved. However, the existence of large range side lobe levels usually
associated with pulse compression processing can degrade contrast resolution
in medical ultrasound. We have considered various different factors that can
affect the range side lobe levels and examined their effect either experimentally
or through simulations. The technique has the potential for improving signal-to-noise ratio (SNR), maximum penetration depth and resolution without
exceeding peak intensity limitations. Some possible applications are discussed
that merit further evaluation. Our work demonstrates the feasibility of this
technique and presents a theoretical framework that can be used in future
studies aimed at evaluating image quality, system performance, and possible artifacts under such an imaging scheme.
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