The ct registry review program
On every other slice
Only on the trailing edges of the slices
On every slice
Only on the first and last slices of the slice volume
90-140
75-90
80-110
70-100
60-90
60-90
70-85
85-100
75-90
50-75
50-85
65-95
65-100
80-110
70-100
90-100
45-95
100-180
110-120
120-200
Decreasing the scan time while leaving the mA constant
Decreasing the slice thickness while covering the same anatomical region
Reformat the data instead of rescanning
Increasing the pitch
10
18
32
IS LESS THAN
EQUALS
IS MUCH GREATER THAN
IS SLIGHTLY GREATER THAN
KVP
PITCH
TABLE INCREMENT
MAS
Second-generation
Third generation
Multi-row detector
Continuous rotation
Pre-patient collimator
Solid-state detectors
Array processor
X-ray tube
Collision btw an incoming electron and the nucleus of the target atom
Collision btw an incoming electron and an electron in an inner shell of the target atom
Slowing down of an incoming electron due to the effect of passing close to the positive charge of the nucleus of the target atom
The photon can pass through the detector unmeasured
The photon is conveted completely into an electron
The measured signal is enhanced by an emplifier
Orienting the pt body part so that it is not perpendicular to the xpray beam
Tilting the gantry
Changing the angle that the x-ray beam leaves the tube
Resolution is dependent on matrix size
Resolution is dependent on reconstruction FOV
Resolution is dependent on scanned FOV
30
40
60
60
80
0.35
0.625
1.6
3.25
Spatial resolution is increased
Pixel size is increased
Noise in the image increases
0.47
1.00
2.13
3.57
8
10
12
13
Improved spatial resolution
Increased appearance of image noise
Anatomical structures appear smaller
The second set resoulution is better than the first set
Noise in the second set more pronounced than first set
Pt dose of the first set higher than the second set
Table increment
Reconstruction interval
Pitch
Collimation
Slice thickness from an MDCT helical scan
The slice overlap from a single row detector scanner helical scan
The slice thickness from a single-row detector scanner helical scan
1.0
1.5
0.5
0.8
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