SPECT Flashcards
What does SPECT stand for?
Single Photon Emission Computed Tomography
- It uses single photon
- It is an emission-based imaging
- It uses algorithms (CT) and produces 3D imaging
- Common in Nuclear Medicine imaging modality
SPECT
It avoids the superimposition of active and non-active layers, which restricts the accurate measurement of organ functions found the planar gamma camera
PECT as Gamma Camera and CT
Detectors are placed ________ to the body
of the patient to minimize ________.
As close as possible
Scatter
SPECT IMAGE ACQUISITION
Images may be taken in what 2 (two) modes?
Continuous Acquisition, Step and Shoot
What is Continuous Acquisition?
While camera leads are in motion
What is Step and Shoot
camera heads stop at defined angles to acquire image.
Components of the SPECT/Gamma Camera
are?
- Collimators
- Scintillation Crystal/Detector
- Photomultiplier Tube (PMT)
- Position Logic Circuits
- Pulse Height Analyzer (PHA)
- Data Analysis Computer
These can be found in front of the detectors, and this is essential to provide positional information, and minimize scatter or false events. They typically
consist of a lead drilled with tens of thousands of closely packed holes, separated from each other by septa.
Collimators
Types of Collimators?
Low, Medium, and High Energy
Used for radionuclides emitting photons up to 160 keV
Low Energy
Used for radionuclides emitting photons up to 250 keV
Medium Energy
Used for radionuclides emitting photons greater than 250 keV
High Energy
Designs of the Collimator
PARALLEL HOLE, PINHOLE, CONVERGING, DIVERGING
Multiple holes which run parallel to each other (most
common design
Parallel Hole
Single hole with a single aperture, providing a magnified and inverted image with superior spatial resolution. Used in imaging small structures
Pinhole
Multiple holes which converge onto a central point,
providing a magnified image with improved spatial resolution. Used in imaging small structures
Converging
Multiple holes which fan away from the center, providing a minified image. Used in whole-body imaging where a larger field of view is required
Diverging
