Ultrasound machine Ultrasound machine knobologyknobology

Copyright © 2010 Academy of Veterinary Imaging

Ultrasound machine knobology…Ultrasound machine knobology…

In other words, what the heck do all of those knobs and buttons do, and how can adjusting

them affect image quality?!?!

• Image optimization– Presets, depth, frequency, auto-optimize, focal

points, gain/TGC

• Features– Archiving, transducers, SRI, compounding,

harmonics, 3-D, LOGIQView, Doppler

GE ultrasoundGE ultrasound

GE ultrasoundGE ultrasound

LOGIQ 7

LOGIQ Book

Go to:Image optimization:

Presets

Depth

Frequency

Auto-optimize

Focal points

Gain/TGC

LOGIQ e

LOGIQ 5

Archiving

Transducers

SRI

CrossXBeam

Harmonics

3-D

LOGIQView

% affected

GE features:

LOGIQ P5

In this presentation, click on the Home button as pictured here to return to this page

Image optimizationImage optimization

• Image quality is comprised of many things• During an ultrasound exam, the ultrasound machine settings should be changed as needed to optimize image quality• Understanding just a few of the knobs can accomplish this for most scans

L7

L5

LB

Le

P5

PresetsPresets

• Settings can be saved as presets• Viewed in Application or Preset

screen• Different presets for different

transducers/structures/patient species/sizes

• The more ‘complicated’ machine settings are saved in presets, so these do not need to be adjusted during every scan

L7

L5

LB

P5

Le

DepthDepth

• Adjust as needed throughout scan

Optimal

L7

L5

LB

P5

Le

FrequencyFrequency

• High frequency• Better resolution• Less depth

• Lower frequency• Lower resolution • Better for depth

L7

L5

LB

P5

Le

Auto optimizeAuto optimize

• ‘Personal preference’ button.• Adds more contrast…Whites are

whiter, blacks are blacker• Try on or off. Chose the setting

that looks better to you. • Auto optimize must be deselected

then reselected for every new structure imaged.

L7

L5

LB

P5

Le

Focal pointsFocal points

• Improved resolution is seen where the focal points are.• Place focal points at the region of interest.

L7

L5

LB

P5

Le

GainGain

• Overall gain– Amplification of received signal

• TGC– Time Gain Compensation– Compensates for beam

attenuation (loss of energy as it passes through tissue)

L7

L5

LB

P5

Le

LOGIQ 7LOGIQ 7

TGC

Auto optimize

Gain

Depth

Frequency

Focal points

(touch screen)

L5

LB

Le

P5

LOGIQ 5LOGIQ 5

TGCAuto

optimize

Gain

Depth

Focal points

Frequency

L7

LB

Le

P5

LOGIQ P5LOGIQ P5

Auto optimizeGain

DepthTGC

Focal points

Frequency

L7

L5

LB

Le

LOGIQ eLOGIQ e

Auto optimize

Gain

Depth

TGC

Focal points

Frequency

L7

L5

LB

P5

LOGIQ BookLOGIQ Book

Auto optimizeGain

Depth

TGC

Focal points

Frequency

(toggle)

L7

L5

Le

P5

Archiving Archiving

• ‘P’ buttons can be programmed

• Default settings:– P1: Saves as raw dicom clip or

still image (image appearance, M-mode, 3-D can be done on a raw dicom clip, but it is a very large file, thus too large to send)

– P2: Print on the thermal printer

– P3: Save as dicom

Archiving Archiving

• Images can be transferred to a CD or USB flash drive.

• Depending on GE model, media must be formatted first– Press Utilities button – Select Connectivity, then removable media

• To eject media after saving images, press F3– Select the media to eject, then finalize

Some GE transducersSome GE transducers

8C 12L

4C

3S

Rectal

i739

SRISRI

• Speckle Reduction Imaging:– Improved contrast resolution– Improved overall clarity– Smoothes regions where no feature or edges

appear– Maintains or enhances edges and borders– Does not eliminate any information– Increased Signal-to-Noise ratio

SRISRI

• Always is on in the LOGIQ e• Can adjust to have different levels in the

LOGIQ 7 and LOGIQ P5– Level is set within the preset (Application)

settings

Spatial compoundingSpatial compounding

• CrossXBeam – = GE’s spatial compounding– Available on the LOGIQ e and LOGIQ P5

• Interrogates tissue at multiple angles• Introduces new tissue info• Averages out speckle• SRI and CrossXBeam together can have

complimentary and additive effects

CrossXBeamCrossXBeam

• Perpendicular angle of insonation generates higher signal

• Images generated with compounding have more angles that are perpendicular to structures

CrossXBeam OFF CrossXBeam ON

CrossXBeamCrossXBeam

• Improved border definition• Improved contrast resolution• Reduced angle dependence • Reduced speckle and noise• Increased visualization of biopsy needles• Can reduce helpful artifact • Can reduce frame rate

LOGIQ eLOGIQ P5

CrossXBeam: P5CrossXBeam: P5

Press L and R buttons simultaneously to see side-by-side display of CrossXBeam on and CrossXBeam off

Press X Beam to turn on

CrossXBeam: LeCrossXBeam: Le

F9 or ‘Comp’ to turn on

Press L and R buttons simultaneously to see side-by-side display of CrossXBeam on and CrossXBeam off

Harmonics (THI)Harmonics (THI)

Display is from echos of a frequency different from the transmitted frequency (i.e. 2x transmitted frequency)

•Reduced artifact

•Improved axial and lateral resolution

•Better margin definition and increased contrast

Harmonics (THI)Harmonics (THI)

Press L and R buttons simultaneously to see side-by-side display of harmonics on and harmonics off

Press THI or Harmonics button to turn on

3-D3-D

• Volume imaging– Volume vs. area affected can be assessed

• Appears more ‘life-like’• Infinite viewing planes• May approximate CT or MRI imaging• Scan parallel* or sweep (fan)• Angle of imaging less operator dependent

LOGIQ eLOGIQ P5

3-D: P53-D: P5

Press Left button to start. Scan anatomy. Press Right button to stop.

Press 3D to turn on

Click arrow to go to images

3-D: Le3-D: Le

Press F7 to turn on

Press Left button to start. Scan anatomy. Press Right button to stop.

Click arrow to go to images

3-D3-DUse set button to alternate

hand and rotate tools

Drag image to corner

3-D3-D

Rotate image

Use set button to alternate hand and rotate tools

3-D3-D

Slice through

Use set button to alternate hand and rotate tools

3-D3-D

Rotate again

Use set button to alternate hand and rotate tools

3-D3-D

Slice through another plane

Use set button to alternate hand and rotate tools

LOGIQViewLOGIQView

• Extended field of view• Better demonstration of anatomical

relationships• Ability to measure large structures

LOGIQ e

LOGIQ P5

LOGIQView: P5LOGIQView: P5

Press LOGIQ View to turn on

Press Left button to start, scan anatomy. Press Right button to stop.

LOGIQView: LeLOGIQView: Le

Press F8 View to turn on

Press Left button to start, scan anatomy. Press Right button to stop.

LOGIQViewLOGIQView

Scan in a straight plane or image will ‘bend’

% affected% affected

• Measure % of tendon affected by the lesion– Press Measure button– Select % stenosis folder– Select % sten (area)– Trace around entire tendon– Press set– Trace around lesion– Press set– % affected = 100 - %sten