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ch. 10 continue..
Terms in this set (11)
Focusing alters the beam in what 3 ways?
1. narrower "waist" in the US beam
2. shallower focus
3. smaller focal zone
Focusing is effective mainly in the _____&_______.
near field & the focal zone
Two types of focusing:
fixed and adjustable-by electronics
another meaning for fixed focusing is called :
conventional or mechanical
another meaning for adjustable focus is called :
three specific methods are:
1. lens-external focusing
2. curved pzt crystal - internal focusing
3.Electronic focusing- adjustable
phased array technology provides _____,_________or_____________
Dynamic, Variable focusing, or Multi-focus
Phased array means
adjustable or multiple focusing
fixed -focus transducers have the ________lateral resolution since the focal depth is fixed and cannot be adjustable.
Single crystal transducers are always _________focus
With phased arrays, the sonographer can move the focus to the anatomic region of clinical importance. This is the reason why the Phased array transducers are said to have ____lateral resolution.
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