chapter 15 ultrasound Physics

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PACS

Picture Archiving and Communication System

what is a bit

a binary digit

wgat is a pixel?

a picture element

digital number

accosiated with computer devices. have obly descreat values, limited chioces. 165.

frequency compounding

creates pictures from sub-bands made of different frequencies

brightness

determines the briliance

contrast

determins the range of briliance

types of scan converters

digital or analog

what is pixel depth?

how many shades of grey displayed

limitations of analog converter

image fade, image flicker, notability, and deterioration

analog scan converter

made grey scale possible

edge enhancement

make edges sharper with bright and dark highlights

bistable

only 2 shades. black or white, either on or off, 0 or 1

fill-in interpolation

pedicts the gray value of gaps between scanlines

wgat are the two important pieces of a digital scan converter?

pixel and bit

spatial compounding

scans image from different angles and combines the pictures

temporal compounding

superimposes old pictures onto the current picture

elastography

tests tge stiffness of tissue using shearing force of sound

pixel density

the number of pixels per inch

advatages of a digital scan converter

uniformity, stability, durability, speed abd accuracy

digital scan converter

use computer technology to convert images into numbers, a process called digitizing

coded exitation

uses long complex pulses to improve the S-N ratio and resolution

how many bytes per word?

16 bytes per _________

analog number

1st grey scale image technique. "real world". unlimited and continuous ramge of numbers. 165.96712

how many bits are in a byte

8 bits per ______

DICOM

Digital Imaging and Computers in Medicine


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