Lesson 1 Flashcards
(29 cards)
any imaging acquisition process that
produces an electronic image that can be
viewed and manipulated on a computer.
Digital imaging
BENEFITS OF PACS
- Reduce radiation exposure.
- Enhanced image quality.
- Easy image retrieval and sharing.
- Reduced storage space.
- Faster processing and diagnoses.
TYPES OF DIGITAL RADIOGRAPHY:
Computed radiography
Digital radiography
Uses a phosphorescence imaging
plate that captures the x-ray image,
which is then scanned and converted
into digital signal.
Computed radiography
Directly
converts x-rays into a digital signal
using a flat panel detector or other
digital detector array.
DIGITAL RADIOGRAPHY
enables the storage, retrieval and
distribution of digital images across a
network.
PICTURE ARCHIVING AND
COMMUNICATION SYSTEM (PACS)
commercialization of CR imaging
systems for use in diagnostic radiology
began, when Fuji introduced their
FCR-101 unit.
1983
Four (4)manufacturers actively engaged in CR
research technology development and marketing:
- FUJI
- AGFA GAVAERT
- KODAK
- KONICA
a rigid sheet with several layers that are
designed to record and enhance
transmission of the image from a beam of
ionizing radiation.
PHOTOSTIMULABLE IMAGING PLATE
CHARACTERISTICS
consists of a durable, lightweight plastic
material backed with a thin sheet of aluminum
that absorbs x-ray.
Cassette
the chemical coating on a phosphor plate in
a computed radiography system.
PHOTOSTIMULABLE PHOSPHOR (PSP)
Thin, tough, clear plastic that protects the
active phosphor layer.
a. Made of carbon fiber or Magnesium
b. No image producing qualities
PROTECTIVE LAYER
This layer of Photostimulable phosphor from
the barium fluorohalide family.
Ability to store and release energy.
PHOSPHOR OR ACTIVE LAYER
Layer of material that grounds the IP from
electrostatic charge.
Increases spatial resolution by
absorbing light.
CONDUCTIVE LAYER
Semi-rigid material that gives the imaging
sheet some strength.
Supportive layer
Sends light in a forward direction when
released in the reader.
LIGHT SHIELD (REFLECTIVE LAYER)
Soft Polymer that protects the back of the
cassette.
Prevent unwanted background
radiation from affecting the
unexposed latent image.
BACKING LAYER
Sends light in a forward direction when
released in the reader.
Prevent unwanted light from affecting
the unexposed latent image.
LIGHT SHIELD (REFLECTIVE LAYER)
the mechanism of x-ray interaction with the
phosphor to produce latent images.
IMAGE ACQUISITION
the movement of the laser across the IP.
Fast Scan Direction
used to convert small amounts of light into
an amplified electric signal.
Photomultiplier Tube
determines the number of shades of gray in
the image.
Analog to digital converter
Graphic representation of the numerical
tone(grays/black/whites) of an x-ray
exposure.
Histogram
is related to the amount of exposure.
X axis
