SonoSite MicroMaxx, Руководство по обслуживанию

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Chapter 3: System Overview 15
Additional System Feature Performances
Broadband Imaging This ultrasound acquisition system uses high resolution uses broadband technology
in the transmit pulsers, transducer, and receivers. The receive path can capture and
process signals over a wide spectrum, from below 2.0 MHz to beyond 10 MHz. For
each application, the transmit pulse is designed to produce an appropriate
bandwidth. For example, in 2D grayscale imaging, a wide band pulse is used to
support good axial resolution. For Doppler modes, a narrower band pulse is used,
which improves the spectral resolution of the detected Doppler signal.
In addition to transmit pulse control, programmable digital signal processing is used
in the receive path to further refine the bandwidth used to produce the final image.
Digital filters are applied to the digitized received signal to limit and shape the
spectral bandwidth used to generate the displayed output.
Tissue Specific
Imaging In this feature, parameters for signal and image processing are optimized to
maximize the image quality or to obtain the best compromise of resolution and
penetration for different specific clinical applications. These parameters include: the
order of received filters, the bandwidth, the dynamic range, the compression curve,
the gain setting and parameters for compounding frequency band, etc. For example,
different system parameter setups are used for abdominal or peritoneal scanning.
This feature is for ease of use for the operator by automatically setting up system
control parameters rather than manually adjusting settings for best performance.
Biopsy Guidance The System is capable of displaying a pair of biopsy guidelines that represent the
anticipated path of the biopsy needle. The image of an anatomical target, biopsy
guidelines, a scan plane marker, and a biopsy needle are displayed on the monitor to
assist in guiding the biopsy needle to the target. The system also provides needle
guidance for vascular access procedures. Additional information regarding this
feature can be found in the biopsy user guides.
Measurement and
Calculation
Capabilities The System offers a variety of measurements and calculations, specific to exam type
and transducer. A listing of the volume, cardiac, Doppler and obstetrical calculations
and measurements that may be made is provided in the User Guide, in the chapter
Measurements and Calculations, and author reference in provided the chapter
References.
Measurement accuracy is discussed the Reference chapter of the User Guide.
Continuous Wave
Doppler Audio
Output The system provides for audio output of the CW velocity information. This can be
presented as stereo information, with flow moving towards the transducer on one
channel and flow away on the other, or as a monaural output with the single audio
output representing the summation of the flow directions.
Pulsed Wave Doppler
Audio Output The System provides for audio output of the PW velocity information. This can be
presented as stereo information, with flow moving towards the transducer on one
channel and flow away on the other, or as a mono output with the single audio
output representing the summation of the flow directions.
Electrocardiograph
(ECG) Display ECG is provided to measure the electrical signal generated by the heart. A three lead
interface: Right Arm (RA), Left Arm (LA) and Left Leg (LL), is provided on the System.
The ECG signal is displayed as an amplitude-versus-time sweeping output.
Amplitude is presented on the vertical axis with time along the horizontal axis.