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Last few decades witnessed the essential requirement of precise and accurate metrology in the field of ultrasonic measurement. The measurement becomes more and more precise with the advancement of the technology. Therefore, review of various issues related to the ultrasonic metrology is essential for the ultimate improvement and new development in existing technologies. The medical ultrasound scan is widely accepted and popular as a diagnostic tool. Therefore, for the better ultrasound imaging and safety, it is essential to precisely measure the energy emitted by the scanning instruments. The ultrasonic technology is comparatively inexpensive and portable, especially as compared with other techniques, such as magnetic resonance imaging (MRI). The fact that ultrasound, with particular chosen frequencies, acoustic pressure, acoustic power, can be used to bring about irreversible changes in tissue, meaning it is finding increasing use in a number of therapeutic applications. Thus, for finding the acoustic output, measurement of acoustic pressure and power plays a crucial role. The measurement devices should ideally be capable of determining the acoustic pressure at a point within the acoustic field and should have a sufficient frequency response to enable the true acoustic waveform to be reproduced. The present paper reviews the metrological issues in medical ultrasonic applications. Sonography is the prominent diagnostic tool in the medical field. The ultrasonic based medical imaging technique is used to visualize various internal organs size, structure and any pathological lesions with real-time monitoring capability. Over the years, ultrasound has become the most convenient tool in the field of diagnostics due to its inherent advantages. Literature-based on the current metrological aspect of ultrasound were studied. Various standards and their limitations are discussed for ultrasonic and related measurements. International Electrotechnical Commission (IEC 61161) suggests that the ultrasound generated from the transducer must be measured and declared for the ultimate safety of patients. The accuracy of measurement must be better than 10%. Latest advanced technologies and future possibilities with better measurement in the field of medical ultrasonic are also briefly discussed.
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