Digital radiography

Question 1

Two types of digital radiography

Answer 1

Computed Radiography

Direct Digital Radiography

Question 2

Computed radiography:

plates

Answer 2

The conventional plates are replaced with CR plates

CR uses a phosphostumalable phosphor (PSP) Imaging plate, which absorbs and stores xray energy to create a latent image

Question 3

Computed radiography:

X ray machine

Answer 3

The same xray machine can be used

Question 4

Computed radiography:

digitizing

Answer 4

sotred energy from the xrays, is realsed as visable light when atoms on the plate are agitated

A laser beam is then used to convert the visable light to a digital signal that can be displayed on a monitor

Question 5

Computed radiography:

reusing plates

Answer 5

the plate is cleared of any latent images during the digitising process. meaning it can be reused over and over.

Question 6

Direct Digital radiography:
Charged couple devices (CCD)

Describe CCD’s

Answer 6

small flat pannel device - recieved and stored light energy from xrays
located under table top
panel is divided into isolated pixels

Question 7

Direct Digital radiography: Flat pannel dectectors

describe

Answer 7

Incorperated into table top, fixed or portable.

large intensifying screens

Question 8

Benefits of digtal radiography

Answer 8

No dark room needed
images stored electronically
lower running costs 
ability to see a wide range of tissues
images can be seen imediently 
images sent to other vets electronically
Images can enhanced - less need for repeat exposures
reduces anaesthetic time considerably
saves time 
no chemicals - better for H&S

Question 9

Digital radiography - artefacts

Plate faults

Answer 9

white lines - cracke plate
white dots - debris
ghost images - not erased properly/exposed to scatter radiation

Question 10

Digital radiography - artefacts

Exposure faults

Answer 10

Over/under exposure

Question 11

Digital radiography - artefacts

image processing faults

Answer 11

oporator errors