Ct resistry review physichs
0.5 and 1.2 mm
2.0 and 3.0 mm
5.5 and 7.8 mm
25.0 and31.5 mm
Iteration
Filtered back-projection
Fourier reconstruction
Z-filtering
Effective mAs
Peak mAs
Absorbed mAs
Constant mAs
Algorithm
Kerenel
Mathematical filter function
1 and 2
1,2 and 3
Binning
Interpolaation
Z-filtering
Partial volume averaging
Cupping
Boiled egg
Stairstep
The Hounsfield bar
Orthographic volume rendering
Shaded surface display
Perspective volume rendering
Minimum intensity projection (min-IP)
0.69mm
0.93mm
1.26 mm
1.68mm
Collimation of the x-ray beam occurs both before and after the patients
Collimation of the beam occurs in the z-axis, thus affecting slice thickness
Increases in collimation increase the intensity of the primary beam
Collimation of the ct x-ray beam is used to limit the detection of scatter radiation
Partial volume effect
Ring artifact
Gibb phenomenon
Star artifact
Euler constant
Incident intensity
Absorber thickness
Transmitted intensity
Scatter radiation
Patient radiation dose
Low spatial frequency signal
High spatial frequency signal
Diameter of data acquistion
Number activated detectors within the array
Correction factors for the specific area of anatomic interest
1and 2
1,2,3
Atomic number of the detector material
Size of the detector element
Size of the tube filament
Amount of interspace material between detectors
Beam pitch
MA
KVp
Algorithm
Reiterated
Post-processed
Retrospective
Reformatted
Patient motion
Beam hardening
Paartial volume averaging
Beam divergence
Beam hardening
Density bloom
Kerma
Partial volume
Contrast resolution
Temporal resolution
Uniformity
Linearity
10%
20%
50%
100%
Tungsten target
Collimator
Rotating anode
Filiament
The electron splits into two-x-ray photons of equal enery up in impact with the matter
The electron loses kinetic enery which is converted into the emission of an x-ray photon
The electron converts the electron it collides with in to an xprayphoton
1 and 2
2 only
They are limited to non-oblique transverse scanning
They cannot generate a straight coronal or sagittal image
They have no moving parts
1 and3
1 2 3
Helical image data is well suited for 3d ssd because there is minimal misregistration or gaps
The volume data, from which the 3d ssd is generated, is created by combining transverse, sagittal, and coronal reconstructions
The tissue surface may be selected by using a threshold value equal to the tissue's ct number
Patient motion during the scan is detrimental to the quality of th 3d images
Volume rendering
Multi-planar reconstruction
Maximum intensity projection
3d shaded surface display
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