RT212 DISPLAY

hard copy

Radiographic film or digital images produced using linear printers and is displayed on an illuminator viewbox

soft copy

Images are viewed on a flat screen monitor

Multiple viewing of the same image

Variation on image display parameters

Reduce number of lost film

Can be delivered in multiple location simultaneously

Manipulate image w/o re exposure

ADVANTAGES OF DIGITAL IMAGE DISPLAY MVRCM

input hardware

Converts data into a form that the computer can use

output hardware

enumerate input hardware

flat panel display

are the most prevalent form of display in radiology department today

display screen

printer

Common output devices are

monitor

printer

speaker

other output device

enumerate output hardware

high spatial and contrast resolution

radiologist needs <> monitor characteristic for image interpretation and diagnosis

cathode ray tube

Vacuum tube that is used as a display screen in computer or video display terminal

cathode ray tube

Thicker in size than LED and LCD, requiring more space on desks and counter

energy consumption

heat production

sheer size and weight of monitor

produce very bright image and very fast refresh rate

disadvantages of cathode ray tube monitor

EHSP

Cathode

Anode

Conductive coating

Phosphor coated screen

Electron beam

shadow mask

PARTS OF A CATHODE RAY TUBE

CACPES

refresh rate

Is the measure of how fast the monitor rewrites the screen or the number of times that the image is redrawn on the display each second

dot pitch

Measurement of how close the dots are located to one another within pixel

liquid crystal display

Produces images by shining or reflecting light through a layer of liquid crystal and a series of color filter

Liquid crystal and hydrogenated amorphous silicon thin film transistors

are contained between glass plates on the front of the monitor

LCD backlight and IPS panel

Most current medical display use an

Angular dependence of viewing

Has led to considerable ergonomic design of digital work stations

disadvantage of a LCD

Light emitting

Curve face

scanning of electron beam

veiling glare distortion

spot pixel

Phosphor nonuniformity

difference of CRT to LCD

LCSVSP

Light Modulating

Flat face

Individual pixel address

Pixel crosstalk distortion

Square pixel

LC nonuniformity

difference of LCD TO CRT LFIPSL

Case

Backlight

Polarized filter

Thin film transistor

Liquid crystal

Color filter

Polarized filter

Cover filter

PARTS OF AN LCD MONITOR

Light emitting diode

<> provided backlight for an LCD monitor

polarize filter

control the intensity and color of the transmitted light

liquid crystal

Material state between that of a liquid and a solid

nematic smectic

two phases of a liquid crystal

color LCD

have red green blue filter fashioned into pixels to create colors

COLOR LCD

it turns white light into millions of different shades

Twisted nematic panel

Oldest, most common LCD screen type and simplest of the three

twisted

TN panel's default state are

untwist

when voltage is applied in TN Panel they <>

Fast response rate for dynamic images, reducing the chance of blur

advantage of TN panel

The viewing angle of the display

Ability of the produce a wide range of colors

disadvantage of TN panel

vertical alignment panel

Designed to solve the contrast issues of TN lcd panels

vertical alignment panel

When no voltage is applied the liquid crystal sits vertically. When voltage is applied, crystal start to tilt over to let light through

will produce blacker blacks

can produce 10 bit image

allows greater viewing angle

function in more extreme temperature

advantage of a vertical panel

WCAF

in plane switching panel

When voltage is applied, the crystal rotate parallel (in-plane) rather than upright to allow light to pass through

in plane switching panel

Superior in color production and greater viewing angle, but offers a slightly lower refresh rate than TN display

twisted nematic panel

USED FOR GAMING BECAUSE OF PERFORMANCE

vertical alignment panel

used in general because of price and quality

in plane switching panel

used in professional where quality is required

resolution

luminance

contrast

bit depth

uniformity

glare

image quality on a monitor display is affected by

resolution

Based on how many pixels can be displayed in the horizontal and vertical dimension

luminance

Measure of brightness of a source such as a digital display device

contrast

Is a function of a luminance and must have adequate amounts of light from all areas

matrix size and bit depth

Size of an image file will depend on

uniformity

Measure the brightness and color are the same across the entire screen (vignetting effect)

ambient or bright lighting

Monitors should not be used in rooms with