Ardms sonographic principles instrumentation spi exam study guide review questions answers.

Temporal Resolution  Pulse Echo Instrumentation Q1. Name the components of an ultrasound system? Answer: The components of an ultrasound system are transducer, pulsar, receiver, scan converter, display, and master synchronizer. Q2. What is the Master Synchronizer? Answer: Master Synchronizer is a component of ultrasound machine which maintains and organizes the proper timing and interaction of all components of the ultrasound machine so that ultrasound system can operate as a single integrated system. Q3. What is an ultrasound transducer? Answer: The ultrasound transducer is a part of ultrasound machine. It contains a piezoelectric material which converts electrical energy into acoustic energy during the transmission phase, and converts acoustic energy into electrical energy when the echoes return to the transducer after traveling in the body during reception phase. Q4. What is Channel? Answer: A channel in ultrasound system consists of a single crystal, the beam former, pulsar electronics, and the wire connecting them. Q5. What is a receive channel? Answer: Each active element in an ultrasound transducer is connected to an amplifier and processing chain. The amplifier and processing chain are collectively known as the receive channel. There are 256-512 active receive channels are present in ultrasound systems. The benefits of more receive channels in ultrasound systems is greater processing flexibility. Q6. What is Switch? Answer: Switch in ultrasound system protects the delicate receiver components from the high voltage signals created during pulse creation. It directs low voltage signals from the transducer to the appropriate processing components within the system. Q7. What is interpolation? Answer: Fill in Interpolation is a technique in which made up pixels are used to fill the areas between the scan lines where there is no information available. Q8. What is frequency compounding? Answer: Frequency compounding is the technique of imaging with multiple frequencies and averaging them out. Frequency Compounding improves contrast resolution and reduces speckle which improves the image quality. Q9. What is Dynamic Frequency Tuning? Answer: Dynamic frequency tuning is a technique in which high frequency portion of the ultrasound pulse is used to create images from the shallow depths, and the low frequency portion of the ultrasound pulse is used to create the images from the greater depths. Q10. All of the following are components of an ultrasound system except? 1. transducer 2. pulsar 3. alternator 4. synchronizer 5. display 6. receiver Answer: c. alternator Alternator is not the component of the ultrasound machine.