Introduction Pulse Ratio Ultrasound Treatment Intensity Size of the Lesion Compiling the treatment dose Examples . Ultrasound Physics Chapter 4. Note CW sound cannot be used to make anatomical images. Would each of the following parameters increase, decrease, or remain the same? Using the formula Duty Factor = Pulse Duration / Pulse Repetition Period" x 100;, what is the duty factor if the pulse duration is 1 microsecond and the pulse repetition period is 1 ms?.1%: When the sonographer changes the depth of view, which of the following will remain unchanged? The further into the tissue the ultrasound travels, the higher the attenuation is, so it is ultimately the limiting factor as to how deep we can image clinically relevant structures. A sonographer adjusts the depth of view of an ultrasound scan form 8 cm to 16 cm. This is one of the most common errors that people make. Intensity and power are proportional to the duty factor. 1. Opinions expressed are those of the authors and not necessarily those of the National Science Foundation. Therefore, the operator indirectly changes the duty factor while adjusting imaging depth. Ultrasound imaging systems are based on the principle of pulse echo imaging. A period B. frequency C. wavelength D. speed E. amplitude (initial) F. pulse duration G PRF H. duty factor I. Definition. - Pulsed at 1:4 adds up to 5,multiply by 5. A duty cycle is on time to total time. They often think that the duty cycle is on time to off time, but it is not. Fig. It is on time to total time. Partial support for this work was provided by the NSF-ATE (Advanced Technological Education) program through grant #DUE 0101709. To determine the PULSE FACTOR, add the two components of the ratio together (e.g. This calculation gives a more realistic duty cycle than just the equation without the efficiency factor. 27. When we talk about pulsed ultrasound, duty cycle is one of the things that we talk about with respect to pulsing the sound. Duty factors are relatively small, less than 0.01, for most pulsed imaging applications. Acoustic Line. The efficiency is added to the duty cycle calculation, because the converter has to deliver also the energy dissipated. The duty factor is the fraction of time that an ultrasound pulse is actually being produced. If an ultrasound system is used for imaging, it must use pulsed ultrasound and, therefor e, the duty factor must be between 0% and 100% (or 0 and 1), typically close to 0. Either an estimated factor, e.g. These ... formula, duty factor is directly proportional to pulse duration, so if the time “ON” increases or the pulse repetition period decreases, duty factor increases and vice versa. … If the ultrasound is produced as a continuous wave (CW), the duty factor will have a value of 1. 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