Ultrasound Physics Chapter 13 & 14

Which of the following is associated with uniform brightness of an image?

What happens if a sonographer increases line density from 1 to 3 lines per degree of sector?

What is the time needed to make a single image if the frame rate of the ultrasound system is 20 Hz?

All of the following decrease temporal resolution except

Which operator control adjusts the intensity of the transmitted pulse?

What is the frame rate if the ultrasound system creates an image in 0.02 seconds (1/50th sec)?

Which of the following will require the TGCs to be adjusted in the most shallow portion of the display?

An entire ultrasound image is too dark. What adjustment should be made first to make image brighter

Which control increased patient exposure during the ultrasound exam?

The fundamental limitation of temporal resolution is acoustic velocity.

Which of the following adjustments would NOT decrease frame rate?

Ultrasound system only displays reflectors in region close to the transducer.Which adjustment is needed to improve image

If the image's far field is difficult to see, what adjustment is needed?

entire US image is too dark,but of uniform brightness.Which is the first adjustment that should be made to improve image

If a sonographer reduces sector size from 90 to 45 degrees and frame rate stays the same, what else occurred?

Preamplification processes extremely weak signals that are susceptible to noise and often takes place in the transducer.

Which receiver function reduces the range of signal amplitudes?

 The ratio of the largest to the smallest signal that a system can handle is termed:

If depth is doubled from 10 cm to 20 cm and frame rate stays the same, what else changes?

What part of the ultrasound instrument is responsible for apodization, beam steering, focusing, and aperture control?

The lines per frame and the frame rate determine the sound wave's frequency?

How can you increase the frame rate to evaluate the fetal heart during an obstetrical ultrasound?

imaging depth,# of foci, sector size, and line density affect temporal resolution & can be controlled by the sonographer

With regard to ALARA, what is the best way to image deeper?

Increasing the number of foci reduces 

Temporal resolution is only determined by ________.

Which operator control adjusts the dynamic range of the displayed echoes?

In real time scanning, the required PRF depend on the number of ______ per frame and ______ rate.

How can you improve contrast resolution to better visualize liver metastases?

Referring to the image below, which adjustment is needed?

Which of the following is associated with uniform amplification of all signals?

Which operator control affects frame rate?

What system control should you adjust to account for sound attenuation with depth?

What is the likely result of turning off multi-focus on a phased array system?

Refer to the image below.  Which adjustment is best when the image does not display any difference in tissue density?

Electronic noise is reduced in the ultrasound system by this method:

What is the most common way to improve signal-to-noise ratio?

What control should you adjust to account for the attenuation of sound as it propagates through tissue?

As frame rate increases, the image quality may degrade.

Which system control equalizes echo amplitudes from similar structures at different depths?

The lines per frame and the frame rate determine the pulse repetition frequency?

Refer to the image,which adjustment will better display the reflectors located in the region closest to the transducer?

Each completion scan of the sound beam produces an image on the display that is called a __________.

Which of the following resolutions improves when frame rate increases?

Which of the following would decrease temporal resolution?

What is the rationale for the ALARA principle?

What receiver function listed below is NOT operator adjustable?

If the image's near field is difficult to see, what adjustment is needed?

Increasing the number of scan lines in one frame improves which of the following?

 Which receiver function converts the negative portion of the signal to positive?

What two system settings affect frame rate?

The critical factor in determining frame rate, line density, and imaging depth is the type of transducer used.

What system control determines the amount of amplification that occurs in the receiver?