Physics Chapter 12

quiz

Which transducer type creates an entirely blank image when only one active element is damaged?

mechanical

All of the following are true about dynamic aperture except:

-it is a form of focusing

-dynamic aperture uses a varying number of crystals during the reception phase

-dynamic aperture is more effective on the reflected rather than the transmitted sound pulse

-dynamic aperture requires multiple sound pulses to be effective

dynamic aperture requires multiple sound pulses to be effective

The firing delay patterns of a linear phased array transducer _______________________.

-focus the sound beam during transmission

-focus the sound beam during reception

-improve axial resolution

-improve temporal resolution

focus the sound beam during transmission

Which of the following transducers is best described as creating a rectangular-shaped image with the use of multiple PZT crystals?

-linear phased

-annular phased

-annular

-linear sequential

linear sequential

All of the following can be related to phased array transducers except:

-internal or external focusing

-multiple active element transducers

-multi-focusing

-adjustable focal depth

Internal or external focusing

A linear sequential array transducer has 128 crystals. How many of these crystals are fired to create a single sound beam?

a small group

What is the advantage of a one and one-half dimensional array transducer?

-improved axial resolution

-improved elevational resolution

-temporal resolution is improved

-refraction artifact is eliminated

improved elevational resolution

Which of the following transducers is best described as mechanical beam steering with multi-focus capability?

-annular

-linear sequential

-linear phased

-annular linear

annular linear

Which of the following transducers is best described as creating an image in the shape of a square with the use of multiple PZT crystals?

-mechanical

-linear sequential

-linear phased

-annular phased

linear sequential

Which transducer type ceates an image with horizontal (or side-to-side) band of dropout when one of the active elements is damaged?

-mechanical

-linear phased

-one and one-half array

-annular phased

annular phased

Which of the following transducers does not create a sector-shaped image?

-annular phased

-linear sequential

-linear phased

-mechanical

linear sequential

What is the shape of an image created with a vector array transducer?

flat-top sector

All of the following are true of vector arrays except:

-the image shape is a sector with a flat top

-they are a combination of linear sequential and linear phased array technology

-focusing is achieved using electronic techniques

-multi-focusing is not possible

multi-focusing is not possible

The use of more active elements to receive reflections with a greater time of flight is called ____________________.

dynamic aperture

Which transducer type creates an image with a band of dropout from the top of the image to the bottom of the image when one od the active elements is damaged?

linear sequential

Which of the following transducers creates a sector-shaped image that is blunted on top?

convex phased

Which of the following focusing techniques allows the sonographer to change the focal depth?

-phased array

-curved crystal

-lens

-external

phased array

Which of the following transducers is best described by the following characteristics: sector-shaped image, single PZT crystal, conventional focusing.

-linear sequential

-mechanical

-linear phased

-annular phased

mechanical

All of the following are true regarding one and one-half dimensional array transducers except:

-thinner imaging slices are created

-elevational resolutions is improved

-the transducer array has a greater number of elements across the face of the probe than up and down on the face of the probe

-three dimensional array images are created

three dimensional array images are created

Which of the following transducers is best described as creating sound beams that are mechanically steered and conventionally focused?

-annular

-linear sequential

-annular phased

-mechanical

mechanical