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Concerning tissue harmonic imaging (THI): a. It usually uses echoes with frequencies that are integral multiples of the fundamental frequency b. It requires a narrow bandwidth transducerc. The basal frequency can be suppressed by using a pulse inversion technique d. The azimuthal resolution suffers in comparison with standard ultrasound imaging techniques e. Reverberation artefacts and side lobe artefacts are reduced |
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Answer» a. True. Usually, the second harmonic (2f0) reaches a useful amplitude and is used, but super-harmonics (3f0, 4f0) can also be recorded with modern transducers. b. False. Harmonic imaging requires a wide bandwidth transducer, which has the functionality to transmit at f0 and receive at 2f0 (or higher multiples). c. True. If every other pulse is inverted, odd harmonics (including the basal frequency) can be suppressed. d. False. The azimuthal (lateral) resolution is improved due to a narrower beam width. e. True. This is one of the main advantages of using THI. |
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