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Product Data Sheet – rev 4.2
July 4th 2003
Page 4
efficient cooling for high throughput and
superior helical performance.
• Wide range of technique factors (10 to 440
mA, in 5 mA increments) gives the operator
and physician flexibility to tailor technique to
specific needs, optimizing patient dose, and
providing the power needed to perform a
broad spectrum of axial and helical
examinations.
System Specifications
Scan Modes:
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The LightSpeed
CT system can perform
virtually any clinical application due to its wide
variety of scan modes. With the LightSpeed
body CT studies are easier to perform and
more productive than ever before.
Helical:
• Continuous 360° scanning with table
incrementation and no interscan delay.
• Scans can be acquired in a wide variety of
speeds.
Axial:
• Up to 16 contiguous axial slices acquired
simultaneously with each 360° rotation, with
the time between scans set by the user-
selected interscan delay (ISD) or intergroup
delay (IGD).
• Scans may be easily clustered in groups to
allow multiple scans in a single breath hold.
• Minimum scan-to-scan cycle time of only 1.5
sec with table moves of ≤ 10 mm (any scan
time).
Scout™:
• Single radiographic plane for scan
localization and graphical prescription of
prospective reconstruction;
• Extended range matches helical scannable
range.
Helical Scans
Slip ring technology has advanced axial
scanning by enabling scans with zero
interscan delay and simultaneous table
movement.
* Option
LightSpeed
With Xtream
CT Scanner System
Helical Multi-slice Modes:
Simplified scan prescriptions and easy-to-use
default protocols make the LightSpeed
and efficient in patient set up.
Multi-slice acquisitions and short intergroup
delays significantly reduce potential mis-
registration between scans by increasing the
number of scans possible in a patient breath
hold. Contrast agents may be better utilized
as well due to significantly faster scan
acquisition.
Helical protocols are almost identical to
"classical" axial scan protocols. At the
beginning of a study, the operator selects the
16
,
type of exam with the anatomical programmer,
and indicates the desired scan range - either
manually, or from a Scout.
After completing the prescribed exam, the
system remains ready to continue with
additional helical scans or a set of axial scans.
The operator may reconstruct helical scans
prospectively with up to 90% overlap, and
retrospectively, at any arbitrary table location
in 0.1 mm increments.
Helical Multi-slice Modes
The complex nature of helical multi-slice
scanning has been simplified by grouping
all critical acquisition parameters within 8
basic scan modes, all optimized for image
quality and speed. For eight-slice
acquisition: 0.625: 1; 0.875: 1; 1.35: 1 and
1.675: 1. For sixteenslice acquisition:
0.5625: 1; 0.9375: 1; 1.375: 1 and 1.75: 1.
These clinically derived multi-slice scan
modes offer a wide range of selections
that carefully balance acquisition speed,
image thickness, artifact level and
retrospective image reconstruction
flexibility.
This simplified user interface guides the
user in the choice of scan parameters.
The user selects a pitch mode, a desired
image slice thickness and table travel per
rotation. The user interface also displays
the resulting choice of retrospective image
thicknesses available for each choice of
acquisition parameters.
The 16 slice helical acquisition modes
provide table speeds from 5.625
mm/rotation up to 35 mm per rotation,
enabling scan speeds that are up to 12
times faster than 4-slice helical scanners.
GE Medical Systems-America
Milwaukee, USA - Fax: 1 414 544 3384
GE Medical Systems-Asia:
16
Tokyo, Japan - Fax: 81 425 85 5490
Hong Kong - Fax: 852 2559 3588
GE Medical Systems-Europe
Prospective Multiple-
Thickness Reconstruction:
16
fast
For all helical scan modes, the operator can
choose to reconstruct images prospectively in
any of the defined nominal slice thicknesses.
In addition to the initial reconstructed slice
thickness, the operator has the option to
prospectively specify additional images to be
reconstructed from a single raw data set.
These images can be reconstructed at any of
the defined nominal slice thicknesses
available for a given table speed and scan
mode.
This effectively facilitates later, more detailed
image analysis without additional patient
scans and subsequent dose and image
registration concerns.
8-SLICE HELICAL MODES
Table Speed (mm/rotation)
Slice
Pitch
Thick
0.625:1
-ness
(mm)
1.25
6.25
2.5
6.25
12.5
3.75
6.25
12.5
5
6.25
12.5
7.5
6.25
12.5
10
6.25
12.5
0.875:1
1.35:1
1.675:1
8.75
13.5
16.75
8.75
13.5
16.75
17.5
27.0
33.5
8.75
13.5
16.75
17.5
27.0
33.5
8.75
13.5
16.75
17.5
27.0
33.5
8.75
13.5
16.75
17.5
27.0
33.5
8.75
13.5
16.75
17.5
27.0
33.5
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