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Chapter 28. Optimizing an Ultrasound Image
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There are different sonographic imaging modes for medical diagnostics, such as conventional imaging, compound imaging, and tissue harmonic imaging. What statement is true regarding conventional imaging?
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A. Implemented by acquiring several (usually three to nine) overlapping frames from different frequencies or from different angles
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B. Generated from a single-element angle beam at a primary frequency designated by the transducer
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C. Acquires the information from harmonic frequencies (multiples of the primary frequency) generated by an ultrasound beam transmission through tissue
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D. Used in obese patients because the contrast resolution can be increased for adipose tissue
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B is correct. Conventional imaging is generated from a single-element angle beam at a primary frequency designated by the transducer.
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A is incorrect. This is the definition of compound imaging.
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C is incorrect. This is the definition of tissue harmonic imaging.
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D is incorrect. Tissue harmonic imaging can be useful in adipose tissue because the contrast resolution can be increased resulting in a better image of the target structure.
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Functional imaging components are useful in optimizing an ultrasound image and consist of the following five adjustments:
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A. Doppler, depth, gain, focus, frequency
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B. Doppler, depth, gain, angle, frequency
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C. Depth, gain, frequency, focus, ambiance
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D. Doppler, gain, depth, ambiance, frequency
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A is correct. Doppler, depth, gain, focus, frequency.
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B is incorrect. Angle is used in spatial compounding. It combines multiple frames from different angles.
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C is incorrect. Doppler is useful to differentiate target structures from vessels.
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D is incorrect. Ambiance is set to help increase an ultrasound image. This is part of your preparation before scanning.
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What should you do when the spread of local anesthetic (LA) is not seen during the injection process?
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A. The operator should stop the injection, tilt the transducer, and inject a tiny amount of LA (or air) to locate the needle tip and spread of injectate.
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B. If you are sure of the target structure, keep injecting.
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C. Check the ultrasound machine and the injectate to ensure it is all in working order. Keep injecting; the spread will show up sooner or later.
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D. Tell the nurse to push harder so the velocity and ...