Mechanical transducer - Study guides, Class notes & Summaries

What is an advantage of single crystal- or pure-wave crystal transducer? A) wide bandwidth B) lower frequencies at higher resolution C) absence of aliasing with pulsed Doppler D) higher frame rate E) greater steering angles - Answer- A If you wish to perform a sonogram with the largest possible field of view in the near field and at depth, what type of array transducer would be preferable? A) linear array B) curved array C) phased array D) sector E) all of the above - Answer- ...

___ is defined as specific area or location where Doppler shift info is being obtained. A. spectral broadening B. nyquist limit C. sample volume D. spectral window C. sample volume Spatial resolution is: A. the minimum reflector separation required to produce separate echos. B. highest with linear phased arrays. C. the weakest reflected signal the transducer can receive D. another term for slice thickness resolution A. the minumum reflector separation required to produce echos Wh...

what improves temporal resolution -answer- low line density, high frame rate, narrow sector line, fewer pulse per frame which of the following is true when the dynamic aperature is increased -answer- near zone length increases Which of the following is the standard protocol for digital imaging that allows compatibility and communication between computers, workstations, and network hardware provided by various manufacturers of CT, MRI, and ultrasound -answer- DICOM the beam of an unfocus...

CEFM Practice Test| Answered 100% Correctly| Updated The paper speed used with EFM in North America is: a. 1cm/min b. 2cm/min c. 3cm/min C. 3cm/min The US transducer on the EFM measures the a. Electrical signal of the fetal heart b. Mechanical movement of the fetal heart reflected off of sound waves c. R to R intervals of the fetal heart b. Mechanical movement of the fetal heart reflected off of sound waves The purpose of the autocorrelation in external monitoring is to a. Compare i...

What type of wave is sound? - CORRECT ANSWER mechanical and longitudi-nal The frequency ranges for ultrasound are: - CORRECT ANSWER >20 kHz The speed of sound in soft tissue is: - CORRECT ANSWER 1540 m/s which of the following transducers fires the elements in groups? A. Linear sequenced array B. Phased array C. Continuous-wave transducer D. Single-element transducer - CORRECT ANSWER A Enhancement is caused by** - CORRECT ANSWER weakly attenuat...

CEFM Practice Test UPDATED ACTUAL Questions and CORRECT Answers The paper speed used with EFM in North America is: a. 1cm/min b. 2cm/min c. 3cm/min - CORRECT ANSWER- C. 3cm/min The US transducer on the EFM measures the a. Electrical signal of the fetal heart b. Mechanical movement of the fetal heart reflected off of sound waves c. R to R intervals of the fetal heart - CORRECT ANSWER- b. Mechanical movement of the fetal heart reflected off of sound waves

Color Doppler demonstrates (x2) - average velocity & direction of flow Which artifacts will be seen with needles? (x3) - - Propagation speed artifact - Reverberation AKA resonance artifact - Bayonet artifact What happens if you decrease the color threshold? - reduce the color displayed - color threshold AKA priority - increase threshold if you don't see enough color If the entire image is too bright, what do you do first? - decrease the output power reverberation artifact due to gas pro...

Which artifact may cause structures to look deeper than they actually are? CORRECT ANSWER Propagation Speed Error The optimum operating frequency for a broad-bandwidth transducer would be? CORRECT ANSWER 10 MHz In breast sonography, which of the following is NOT significantly affected by the limited field of view when imaging superficial structures? CORRECT ANSWER Temporal Resolution Which of the following affects the actual intensity of the sound utilized for imaging? CORRECT ANSWER Ou...

When applying to write a Power Engineer certificate of competency examination, the candidate must: Select one: a. Undergo mandatory drug testing b. Hold the next lower class of qualification c. Pass a criminal records check d. Pass both a written and oral examination - Answer-b. Hold the next lower class of qualification A machine lifts a load of 12kN with an applied effort of 4kN. What distance will the load move if the effort moves a distance of 8m and the efficiency of the machine is 7...

ARDMS SPI Exam (2024) || All Questions & Answers (Graded A+) ARDMS SPI Exam (2024) || All Questions & Answers (Graded A+) The range of frequencies produced by a damped PZT element is called: a. fundamental frequencies b. Q Factor c. near field d. bandwith - ANSWER - d. bandwidth The percentage of time that the ultrasound instrument is emitting ultrasound is called: a. PRF b. pulse duration c. pulse repetition period d. duty factor - ANSWER - d. duty factor; the maximum value is ...