GE Logiq P5 User Manual

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Direction 2300002-100 Rev. 2Moving Through
the 3D VOIYou can move through the 3D VOI using the red hand. Press 
Set when the red pointer finger is positioned on the red box. 
Move the closed red hand to move through the 3D VOI. 
 Figure 5-24. Moving through a 3D Volume of Interest (Red Hand)
NOTE:  Any plane in the volume can be made active (highlighted with 
red box) by clicking on it.  
						

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Direction 2300002-100 Rev. 2 Viewing Specific
Portions of the
AnatomyYou can pull back tissue to view specific portions of anatomy 
using the yellow hand. Press Set when the yellow pointer finger 
is positioned on the yellow box. Move the closed yellow hand to 
manipulate the 3D VOI. 
NOTE:  This actually moves an edge. A yellow hand appears only when 
the pointer is on an edge of the VOI. 
 Figure 5-25. Manipulating the Edge of a 3D Volume of Interest (Yellow Hand) 
						

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Direction 2300002-100 Rev. 2Pulling Back a
Corner of the VOI
to View Specific
AnatomyYou can pull back a corner to view specific portions of anatomy 
using the green hand. Press Set when the green pointer finger is 
positioned on the green box. Move the closed green hand to 
manipulate the 3D VOI.
 Figure 5-26. Manipulating a Corner of the 3D Volume of Interest (Green Hand) 
						

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3D Acquisition Parameter Description
 Figure 5-27. 3D Acquisition 
Table 5-5: 3D Acquisition Description and Instructions for Use
3D ParameterDescription
Application 
PresetsSelections: None, OB - Baby Face, Vascular
None. No application preset applied. 
OB - Baby Face. After having scanned in this mode, certain rendering parameters 
are set automatically. The gray surface mode is activated and the texture mode is 
switched off. The gray surface mode values for opacity and threshold are set 
automatically according to the datasets histogram. 
Vascular. Available only with Advanced 3D or Tru 3D package. After having scanned 
in this mode, certain rendering parameters are set automatically. The color image is 
rendered in the texture mode. The values for opacity and threshold of the texture 
mode are set automatically according to the datasets histogram. The B-Mode image 
is rendered in the gray surface mode. Opacity and threshold values are defined 
according to the histogram.  
						

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Acquisition Mode Selections: Sensorless Parallel, Sensorless Sweep, With Sensor
Sensorless Parallel. In this mode the probe must be moved during 3D data 
acquisition without angling it. You should scan the object you want to render in 2-4 
seconds. The speed at which you scan should be constant. No sensor is mounted on 
the probe. 
• Since the time for post-processing depends on the acquired number of frames, it is 
recommended that you check the frame rate. Low frame rates result in fewer 
acquired frames for the 3D dataset which results in intensive post-processing 
(interpolation). Therefore, low frame rate = long post-processing. 
Sensorless Sweep. In this mode the probe must be moved to a position where you 
can clearly see a middle cut of the object you want to scan and render. Tilt the probe 
to about 30 degrees until the object you want to scan disappears. Start the acquisition 
and tilt the probe over a distance of around 60 degrees until the object disappears 
again. The entire scan time should be around 2-4 seconds. During the sweep, the 
probe may not be moved parallel, just tilted. No sensor is mounted on the probe. 
Before starting an acquisition, take care that the transmitter is positioned correctly 
during data acquisition and that the transmitter cannot move. 
The transmitter has to be placed in such an orientation that the probe with the 
receiver attached is always in the forward hemisphere of the transmitter during 
scanning. If the distance between the receiver and the transmitter exceeds 70 cm, a 
beep tone signals that the data acquisition has been interrupted. 
The patient MAY NOT move during the acquisition. 
Scan Plane Selections: Front to Back, Side to Side
Front to Back. After having scanned in this mode, the rendered dataset is shown in a 
frontal view. For acquiring a fetal face in sagittal cuts, use this mode. 
Side to Side. After having scanned in this mode, the rendered dataset is shown from 
a side view. For acquiring a fetal face in coronal cuts, use this mode. 
3D Starts the rendering process. 
Scan Distance Adjusts the distance covered during the scan. Depending on the real width of a scan 
acquired during a sensorless 3D acquisition, the volume of interest’s width can be 
enlarged or reduced. You can adapt the form of a fetal face if the baby’s head looks 
oval instead of round. The assumed default width of a parallel scan is 6 cm; of a fan 
scan 60 degrees. 
Table 5-5: 3D Acquisition Description and Instructions for Use
3D ParameterDescription 
						

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Easy 3D
 Figure 5-28. Easy 3D 
Descriptions and instructions for using Easy 3D follow: 
Table 5-6: Easy 3D Description and Instructions for Use
3D ParameterDescription
Reset Resets the 3D volume of interest back to its original orientation. 
Undo Undoes any manipulation you have done to your 3D dataset. 
Auto Movie Initializes the calculation and display of a 3D movie. A rotation of 30 degrees left and 
right around the actual image position (either the default position after acquisition or 
the position that was manually defined by manipulating the 3D volume of interest) is 
shown. For this 60 degree rotation, eleven images in steps of 6 degrees are 
calculated.
Scalpel Structures, for example a part of the placenta hiding the view to a fetal face, can be 
cut out in a rendered image. All visible structures can be cut out.
The option of ‘erase inside’ deletes all structures inside the marked region. The option 
of ‘erase outside’ deletes all structures outside the marked region. 
The region in the rendered image is marked with the right Set key. To define the 
contour of the region, press the right Set key for each vertex. To close the contour, 
double click the right Set key. As long as a contour is not closed, it can be traced back 
with the left Set key. The cut out process can be undone by the Undo Last function. 
As soon as the Apply button is pressed, a new dataset is generated. 
Gray Surface Activates the gray surface rendering mode. It leads to a transparent appearance of 
the object, generated by displaying only a surrounding shell of structures.  
						

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Texture Activates the texture or photorealistic rendering mode. It creates a photorealistic 
appearance of the object. The shading depends on the orientation of the surface of 
the object. 
If both Texture and Gray Surface mode are switched on, the mixture percentage of 
both modes can be defined. 
Render Changes between the rendered image view and the view of a volume of interest. The 
volume of interest shows the acquired ultrasound images transformed into an 
isotropic rectangular coordinate system. The volume of interest can be manipulated 
as described above. 
Threshold/Opacity Threshold defines which gray values are used for rendering and which are 
considered noise. Opacity defines how strict Threshold is used for discrimination. A 
low opacity value creates a firmer appearance of the surface. A high opacity value 
leads to a transparent appearance of the rendered image. 
Colorize/Contrast Colorizes the 3D render or adds contrast to the 3D rendered image. 
Table 5-6: Easy 3D Description and Instructions for Use
3D ParameterDescription 
						

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Advanced 3D
 Figure 5-29. Advanced 3D 
Descriptions and instructions for using Advanced 3D follow: 
Table 5-7: Advanced 3D Description and Instructions for Use
3D ParameterDescription
Tile The display can be divided into 1, 2, 4, or 6 windows. Switching to a lower number of 
windows keeps the images from left to right. 
3D Landscape Shows a combination of 2D slices and a 3D rendered image. After a color acquisition 
you can combine the 2D B-Mode image slices with a 3D rendered color image. This 
mode allows stepping through the B-Mode images along a vessel structure. 
The 2D slice can be moved with the right Set key. The Trackball symbol has to be 
positioned inside the 2D plane. 
Active Data Manipulations of rendering parameters only have an effect on the data defined as 
Active Data. After having selected Active Data, a list of data is displayed, Gray Data, 
Red, Blue. Choose the data to be manipulated. 
Visible Data After selecting Visible Data, a list of data is displayed, Gray Data, Red, Blue. Choose 
the data you want to display. For example, if only color data is chosen, the B-Mode 
image is switched off in the rendered image and only vessel structures are displayed. 
Main Three orthogonal cuts (with colored frames) of the acquired volume of interest are 
shown after pressing Main. The volume of interest shows the acquired ultrasound 
images transformed into an isotropic rectangular coordinate system. 
On the left top of the image window a complete volume of interest is displayed. It 
shows the position of the three orthogonal planes in the VOI. A green point displayed 
in each plane defines the point of intersection of the three planes. This point can be 
set to different positions in the planes by a double pressing the right Set key. A plane 
can be moved parallel in the VOI by pressing the right Set key on the position of the 
green point and moving the Trackball up and down inside the plane.  
						

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Movie 3D
 Figure 5-30. Movie 3D 
Descriptions and instructions for using Movie 3D follow
Table 5-8: Movie 3D Descriptions and Instructions for Use
3D ParameterDescription
Manual An animated rotation of the rendered image can be calculated and displayed by this 
function. Using this function, you first need to define the start and end position of the 
rotation. To define this, move the VOI to the start position, the press Define Start. 
Move the VOI to the end position and press Define End. 
Movie 360 
DegreesThe calculation and display of a complete rotation around the axis, defined by the 
Axis button, starts in steps of 15 degrees. 
Auto Movie Initializes the calculation and display of a 3D movie. A rotation of 30 degrees left and 
right around the actual image position (either the default position after acquisition or 
the position that was manually defined by manipulating the 3D volume of interest) is 
shown. For this 60 degree rotation, eleven images in steps of 6 degrees are 
calculated.
Axis All rotations (Auto Move and Movie 360) are calculated as rotations around the 
specified axis (X, Y, or Z). 
Movie Speed You can adjust the speed of any 3D rotation. 
Pause Stops and restarts the rotation. As soon as Pause is pressed, the different rotation 
steps can be displayed by moving the Trackball.  
						

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