Imaging modalities Part 2 Flashcards
The type of medical imaging that shows a continuous x-ray image on the monitor.
Fluoroscopy
Study of moving body structures.
Fluoroscopy
The primary function is to provide real-time dynamic viewing of anatomic structures.
Fluoroscope
Dynamic studies are examinations that show the motion of circulation or the motion of internal structures.
Fluoroscopy
Allows the physicians to view a continuous image of the internal structure while the x-ray tube is energized.
Fluoroscopy
complex electronic device that receives the remnant X-Ray beam, converts it into light, and increases the light intensity.
Image intensifier
Digital radiography was introduced in 1981 by Fuji with the first commercial computed radiography (CR).
Computed radiography
form of digital radiography.
computed radiography
A digital image acquisition process using a Conventional X-ray machines that produces images that have much better contrast than a Conventional X-ray film-screen system.
computed radiography
A process of capturing radiographic data from a conventional X-ray machine and processing the data digitally to produce high quality radiographic images.
Computed radiography
For exposure, an Imaging Plate (IP) is placed in a cassette instead of a piece of film. The IP captures and “stores” the X-rays.
Computed radiography
Components of a CR system
- cassette with imaging plate
- ID tablet
- Preview and ID station
- Digitizer
- Processing server
- Laser camera
an x-ray–sensitive plate that is encased in a protective cassette.
CR image receptor
Both produce a latent image, in a different form, that must be made visible via processing.
CR image receptor
The Imaging Plate looks like the intensifying screens found in Conventional film-screen cassettes
Imaging plate (IP)
Coated with photostimulable phosphor, also called storage phosphor.
Imaging plate (IP)
contains a protective coat, a conductive layer, support and laminate layers.
Imaging plate (IP)
Instead of emitting light immediately when exposed to X-rays, the photostimulable phosphor has the special property of storing the X-ray energy in a latent form and releasing the same when stimulated by a laser energy in the CR Reader /Digitizer.
Imaging plate (IP)
A digital image acquisition process using a digital X-ray machines with flat panel detectors.
Digital Radiography
Uses two types of detectors:
– Direct
– Indirect
Digital Radiography
Uses a two step process that first converts X-rays
into light, then converts that
light energy into electronic signals
Indirect detectors
The flat panel detector consists of an amorphous selenium semiconductor X-ray absorber coating over a thin-film transistor array of amorphous silicon
Direct detectors
In this system, X-ray photons are immediately converted into electronic signal
Direct detectors
This immediate conversion eliminates the need for additional steps to capture and convert incident X-ray energy
Direct detectors
Corrective image processing which can result in
increased image noise si reduced with the highly efficient X-ray energy conversion of direct DR
direct detectors
automatically convert X- rays into electronic signals.
direct detectors
X-rays interact with semiconductor material Amorphous selenium
Direct detectors
X-rays converted directly into electrical charge
* No intermediate steps
Direct detectors
