Chapter 28. Optimizing an Ultrasound Image
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?
A. Implemented by acquiring several (usually three to nine) overlapping frames from different frequencies or from different angles
B. Generated from a single-element angle beam at a primary frequency designated by the transducer
C. Acquires the information from harmonic frequencies (multiples of the primary frequency) generated by an ultrasound beam transmission through tissue
D. Used in obese patients because the contrast resolution can be increased for adipose tissue
B is correct. Conventional imaging is generated from a single-element angle beam at a primary frequency designated by the transducer.
A is incorrect. This is the definition of compound imaging.
C is incorrect. This is the definition of tissue harmonic imaging.
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.
Functional imaging components are useful in optimizing an ultrasound image and consist of the following five adjustments:
A. Doppler, depth, gain, focus, frequency
B. Doppler, depth, gain, angle, frequency
C. Depth, gain, frequency, focus, ambiance
D. Doppler, gain, depth, ambiance, frequency
A is correct. Doppler, depth, gain, focus, frequency.
B is incorrect. Angle is used in spatial compounding. It combines multiple frames from different angles.
C is incorrect. Doppler is useful to differentiate target structures from vessels.
D is incorrect. Ambiance is set to help increase an ultrasound image. This is part of your preparation before scanning.
What should you do when the spread of local anesthetic (LA) is not seen during the injection process?
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.
B. If you are sure of the target structure, keep injecting.
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.
D. Tell the nurse to push harder so the velocity and ...