6 Recon Parameters
Primary Recon parameters can be reviewed and set from the
Scan Settings
window on the scan
monitor. Secondary Recon parameters can be reviewed and set from the
Reconstruction and
Image Processing
area on the image monitor.
6.1 Recon Parameter descriptions
6.1.1 Recon Type
Available Recon Types include:
Soft
,
Stnd
,
Detail
,
Lung
,
Bone
,
Bone Plus
,
Chest
,
Edge
,
HD
Stnd
,
HD Detail
,
HD Lung
,
HD Edge
,
HD Ultra
,
HD Bone
and
HD Bone Plus
.
6.1.2 Hi Res
Hi Res reconstruction algorithms provide the capability to select reconstruction algorithms that
enhance the inherent resolution in Hi Res mode acquisitions or use the additional views to
reduce aliasing artifacts, improve off-center DFOV imaging, and decrease streaking from dense
structures. The algorithms that have a HD prefix added to the algorithm name provide increased
resolution for DFOV of 25 cm or less. The normal algorithms can be used, which will not provide
improved resolution but may be useful when large DFOV is used followed by a targeted
reconstruction smaller DFOV, reducing aliasing and view spacing artifact.
6.1.3 Axial Plus Recon Mode
The system provides a Plus recon mode for an Axial scan type.
This mode is only available on Secondary Recons, can be optionally combined with ASiR-V,
and is only available for collimations greater than or equal to 40 mm.
Image annotations identify this recon mode with a
+
sign near the Recon Type selected.
6.1.4 Cardiac Axial Plus Recon Mode
See the Cardiac chapter for detailed information.
6.1.5 Full and Plus Recon Modes for Helical scan types
The system provides the ability to manage dose, slice profile, and helical artifact through the
Full and Plus recon modes.
•
Full mode provides a thinner slice profile but requires 10–15% more mA than Plus mode
with equal image noise.
•
Plus mode has up to a 20% wider slice profile than Full, but requires 15–20% less mA with
equal noise. At the same mA, Plus mode provides reduced image noise.
○
Reduction of helical artifacts can be seen with Plus mode.
○
Plus mode uses additional views of data to reconstruct an image.
○
When acquiring images in Plus mode, exposure time increases slightly to assure that
enough views are collected to reconstruct all image locations prescribed.
6.1.6 IQ Enhance for Helical scan types
IQ Enhance is a special reconstruction process that can be prescribed to minimize artifacts
commonly occurring in thin slice helical acquisitions. If you select the Helical scan type, IQ
Revolution CT User Manual
Direction 5480385-1EN, Revision 1
Chapter 11 Scan
289
