GE Healthcare Optima CT580 W - Manual (Page 4)

Raw Data
Photon statistics and
object modelling
Conventional CT
Reconstruction
Iteration 1
Final Image
Constant image quality throughout scan. The mA (tube current) is adjusted (raised or lowered) according to the
different anatomy being imaged and body habitus.
* Image quality measured as image standard deviation
Z-axis tracking cuts dose by up to 40%
Z-axis tracking provides automatic and continuous correction
of the X-ray beam position, adjusting the beam collimation and
position to get a constant narrow beam on the detector, saving
up to 40% dose.
3D Dose Modulation utilizing SmartmA™ and AutomA
ASiR
workflow
Operator prescribed max mA
Average mA
Actual mA
RLA
150ma
300ma
PA LLA AP
Closed cams for
narrow beam
Open cams for
wide beam
Counter rotate cams
to position beam
Have it both ways.
A leap ahead in dose management
GE-exclusive ASiR overcomes the issues of noise and image
artifact at low dose. An advanced iterative reconstruction
technique, it models the causes of noise and thereby removes
the noise during reconstruction. It overcomes the limitations of
the conventional CT reconstruction approach known as filtered
back projection and produces an optimized image using an
advanced iterative computation. Result? You can reduce dose
by up to 40% while maintaining image quality* and improve
low-contrast detectability (LCD) by up to 10% with equivalent
dose or maintain LCD at up to 25% less dose. In any size
patient. For any anatomic region. It’s great news for a wide
range of patients, including pediatrics and those who need
follow-up CT exams.
Always improving on the proven
In addition to ASiR, the Optima CT580 W builds on key imaging
and dose-management features of previous GE CT systems.
Our exclusive Volara™ 24-bit Digital Data Acquisition System
(DAS) reduces noise up to 33% for exceptional image quality
in signal-starved anatomy, low-contrast soft-tissue areas,
and large patients. It also lets you optimize technique for
dose-sensitive anatomy. Smart mA™, an automatic dose
modulation technique, tells you the dose before the scan
starts, so you can easily personalize dose protocols and
minimize dose for virtually every patient – large and small.
IQ Enhance (IQE) allows faster pitch scanning covering more
anatomy without sacrificing image quality for speed. Optima
CT580 W also gives you flexibility to address critical situations,
such as polytrauma and non-cooperative patients.
Bowtie beam shaping filter
The bowtie filter automatically attenuates off-axis rays to
maintain a more uniform x-ray field at the detectors. This
minimizes dose and reduces x-ray scattering effects.
Dose report and prospective dose display
Optima CT580 W features a DICOM-structured dose report,
which provides a clear summary of CTDIvol and DLP parameters.
It also comes with a prospective dose display that allows
clinicians to monitor dose before the scan, avoiding any
unnecessary dose delivery to the patient.
3D dose modulation
Optima CT580 W uses a 3D modulation algorithm which
automatically adjusts the mA as you scan along x-y-z
axes. The modulation maintains image quality while
reducing dose.
Finer Image detail. Low dose. Enhanced Low-Contrast Detectability (LCD).
Compromise no more. Now you can reduce dose dramatically and still see the
same image detail – thanks to the latest GE dose-management innovation.
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