Cr and dr

2. M Irshad Siddiqi
MID
Lecturer Radiology

3. Difference Between
Computed Radiography(CR)
And
 Digital Radiography(DR)

4.  Radiography is an imaging technique
using X-rays, gamma rays, or similar
radiation to view the internal form of an
object. To create the image, a beam of X-
rays or other form of electromagnetic
radiation is produced by an X-ray
generator and is projected toward the
object.

6.  Conventional Radiography
 Computed Radiography
 Digital Radiography

7. How does it work ?
 Computed radiography (CR) is the
digital replacement of conventional X-
ray film radiography and offers
enormous advantages for inspection
tasks, the use of consumables is virtually
eliminated and the time to produce an
image is drastically shortened.

8.  Imaging plates are reusable
 No darkroom or chemicals needed
 Reduction in exposure and processing time
 Software-based evaluation and reporting
 Simple digital information exchange and archiving
 Furthermore, more details are visible and analyzable
with computed radiography due to a higher dynamic
range when compared to film. Other advantages over
film include a more simplified workflow, a safer
working environment for operators and a more
environmentally-friendly chemical-free process.

9.  Instead of film, an imaging plate is exposed to X-ray
or gamma radiation.
 The imaging plate is digitized by the scanner and
then erased for immediate reuse.
 The digital image is then displayed on a computer
monitor for evaluation with specialized software.

10.  In computed radiography, when imaging plates
are exposed to X-rays or gamma rays, the energy
of the incoming radiation is stored in a special
phosphor layer. A specialized machine known as
a scanner is then used to read out the latent image
from the plate by stimulating it with a very finely
focused laser beam. When stimulated, the plate
emits blue light with intensity proportional to the
amount of radiation received during the
exposure.
.

11.  The light is then detected by a highly
sensitive analog device known as a
photomultiplier Tube (PMT) and
converted to a digital signal using an
analog-to-digital converter (ADC). The
generated digital X-ray image can then
be viewed on a computer monitor and
evaluated.

12. Imaging Plate Scanner
 High resolution CR scanner for all NDT radiography
applications - weld testing, profile images and
aerospace.
Imaging Plates
 IPs are available in different resolutions and all
standard formats and, on request, in special sizes and
custom shapes.
D-Tec Software
 All functions from image acquisition, analysis and
related report generation, to export, archiving and
database management are included.

13.  Radiographic Testing (RT) is a non-
destructive testing (NDT) method which
uses either x-rays or gamma rays to
examine the internal structure of
manufactured components identifying
any flaws or defects.

16. FILM CR
Exposure medium Film Imaging plate (reusable)
Processing
Darkroom conditions and
chemistry required
No darkroom conditions or
chemistry required
Processing time 8 minutes
1-3 minutes (depending on
scan resolution)
Evaluation Film viewer
Computer with
viewing/analysis software
Archiving
Film archive room
(humidity and
temperature-controlled)
PC, cloud / remote network
server
Availability Unique master copy
Unlimited copies with
possibility to access from any
location

18.  DR in the short term is the latest
technology in radiography. The DR
technology transfer automatically the
images to a computer. So you can
quickly evaluate and propose a
diagnosis. As it is a recent advancement,
it is, of course, slightly expensive
compared to Computed Radiography but
with a lot of advantages.

19.  Is a cassete-less system
 Uses a flat pannel detector or charge coupled
devices which is connected to a computer
 Flat panel detectors (FPDs) are the most
common kind of direct digital detectors. They
are classified in two main categories
 Direct FPDs
 Indiect FPDs

21. CR DR
Imaging plate Transistor receiver ( like Bucky )
Processed in a digital reader Directly into digital system
Signal sent to computer
And viewed on computer
Seen immediately on computer