GE Healthcare Optima CT520 - Manual (Page 13)

Optidose
The Optidose features allow you to actively manage dose
across exam types.
• 3D dose modulation automatically adjusts the mA as you
scan along the x-y-z axes. The modulation maintains CT
image quality, via a noise index to optimize the mA to only
what is needed to deliver the image quality you choose.
• Pre-patient collimation blocks x-rays not needed for
the image and optimizes the beam width to improve
geometric dose efficiency.
• Bowtie beam-shaping filter used in the scanner maintains
more uniform X-ray at the detector, minimizes surface dose,
and reduces X-ray scatter.
• Color-coded pediatric protocols provide intuitive management
of pediatric exams, categorizing children into one of eight
colored categories based on their weight and size to help
clinicians select the right-sized scan technique.
• Easy-to-archive DICOM-structured dose report is generated
after every scan, providing dose parameters and a clear
summary of how the procedure was performed.
A proven leader in dose-reduction technologies, GE continues to develop important dose-optimization
features and make them available across platforms. The Optima CT520 provides many tools to help the
clinician manage dose, while achieving clinically diagnostic image quality.
VISR
Volumetric Image Space Reconstruction (VISR) provides a 3D
filter that reduces noise without compromising resolution, for
clear visualization of brain, tumor, and pediatric cases. With
the VISR 3D filter, the scanner delivers up to 20% image quality
improvement at the same dose, or the same image quality with
up to 36% dose reduction.
††
ASiR
Typically, dose reduction causes an increase in noise (pixel standard
deviation) and image artifacts. But GE’s industry-breakthrough
Adaptive Statistical Iterative Reconstruction (ASiR) solves this
by subtracting noise, not merely masking it. ASiR also delivers
enhanced image quality by improved low-contrast detectability
(LCD). The result is better patient care with a dramatic reduction
in dose of up to 40% with no loss of image quality.
VISR reduces dose up to 36% without compromising image quality.
†† In clinical practice, the use of VISR may reduce CT patient dose depending
on the clinical task, patient size, anatomical location, and clinical practice.
A consultation with a radiologist and a physicist should be made to determine
the appropriate dose to obtain diagnostic image quality for the particular
clinical task.
ASiR extracts noise by modeling its root system statistical causes, allowing for
low-dose scanning across anatomies and patients while preserving image quality.
When ASiR is installed, 3D Neuro filter will be disabled.