Display & Imaging

a video display that is limited to black and white only, with no shades of gray is called

• grayscale

• binary

• bistable

• grayhound

Answer explanation

B

Without any intermediate shades of gray, ability only to show black and white only

Which electronic component is required for gray scale imaging ?

• VCR

• Non-interlaced display

• computer memory

• scan converter

Answer explanation

D

It is used to create gray scale images

Which of the following will provide scan converters will provide the LEAST spatial resolution ?

• 256x256 pixels

• 750x750 pixels

• 128x128 pixels

• 1000x1000pixels

Answer explanation

D

The scan converter with the highest # of picture elements produces the best spatial resolution. 1000x1000 has 1million picture elements therefore highest image detail

how many gray shades can be represented by a group of

4 bits?

• 2

• 16

• 8

• 4

Answer explanation

simply multiply 2 by itself as many times there are bits

2x2x2x2

A pixel displays up to 3 gray shades simultaneously

True or False ?

• True

• False

Answer explanation

At any given moment , a pixel can display only a single shade of gray.

Where does coded excitation take place?

• Pulser

• Receiver

• PACS system

• trasnducer

Answer explanation

Coded excitation is the process of creating complex pulses to improve image quality. Takes place in pulser

Which of the following is not true about spatial compounding ?

• data is collected from different viewing angles

• frame rates are reduced

• shadowing artifact can be eliminated

• can be performed with mechanical transducer

Answer explanation

Can only be performed with phased array that electronically steer sound beams in different directions

Images have higher resolution than what appears on the systems display

True or False ?

• False

• True

Answer explanation

older, archived studies and reports can be reviewed easily. Data does not deteriorate over time.

Images can be delivered to distant locations on the imaging network

Which of the following is best described as an analog number ?

• the number of people in the room

• the number of stars in the sky

• the number of tires in a car

• the weight of a person

Answer explanation

The weight of a person can be considered analog because it is continuous an can achieve a unlimited number of values.

Spatial resolution does change in read magnification

True or false ?

• True

• False

Answer explanation

Spatial resolution does NOT change bc the number of pixels in the ROI is unchanged. However the pixels are larger in the zoomed imaged.