ARDMS (American Registry for Diagnostic Medical Sonography) Practice Test

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What configuration is necessary to focus the ultrasound wave in a linear phased array transducer?

Dynamic aperture
Electronic curve
Electronic slope
PZT crystals

The correct answer is: PZT crystals

In a linear phased array transducer, focusing the ultrasound wave requires the use of PZT (Lead Zirconate Titanate) crystals. PZT crystals have the ability to change their thickness when exposed to an electric current. This property allows the transducer to focus the ultrasound beam by varying the timing of the electrical signals sent to different elements within the transducer array. By appropriately activating the PZT crystals, the ultrasound beam can be focused to produce high-resolution images at different depths within the tissues being examined. Options A, B, and C (Dynamic aperture, Electronic curve, Electronic slope) are not directly related to focusing the ultrasound wave in a linear phased array transducer. These options are not typically associated with the specific function of focusing the ultrasound beam using PZT crystals.