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Table 22: Primary Recon collection – Helical
Element Description
Thickness
Image thickness.
Recon Type Reconstruction algorithm.
Recon Mode • Full
• Plus
IQ Enhance
See Section 1.6 for detailed information.
Interval Image interval.
ASiR-V
See Chapter 12, for detailed information.
Window Width
Can be set for different groups.
Window Level
Can be set for different groups.
Flip / Rotate
See Section 1.8 for detailed information.
6.3 Primary Recon parameters workflow
Most recon parameters are set from the protocol and from adjustments made with graphic lines
on the scout image. When setting recon parameters, it is important to know specifically what
you are looking for. If you are looking for fractures, you would want to use a different set of
parameters than if you were looking for a mass.
6.3.1 Set the Slice Thickness
1. From the
Scan Settings
window, click
Primary Recon
.
2. Choose the
Thickness
.
○ The smaller the slice thickness, the more technique you need to use. The thinner the
slice thickness, the higher the noise will be in the slice. Adjust protocol factors to provide
desired image quality and noise level for the acquisition.
○
A thinner slice provides better detail. However, contrast resolution will be decreased.
6.3.2 Set the Image Interval
The Image Interval is for Helical scans only and is automatically set to match the slice thickness
by the system. This is known as contiguous (back to back) scans. Use this procedure to set an
Image Interval if you want a contiguous, overlapped, or spacing (skip) in the scan prescription.
1. Click
Interval
.
2. Type an interval value in mm.
For a Helical scan type, the table moves in mm per rotation, while exposing the patient.
○
The image interval defaults to equal the slice thickness (for primary reconstructions
only).
○ The maximum interval is twice the slice thickness.
○ The interval can be less than or greater than the slice thickness.
Revolution CT User Manual
Direction 5480385-1EN, Revision 1
Chapter 11 Scan 293