6 Working With Measurements

6 Working With Measurements
6
Working With Measurements
Measurements accompanying ultrasound images supplement other clinical procedures
available to the attending physician. Accuracy of the measurements is determined by the
Terason Ultrasound software and by proper use of medical protocols.
When you freeze a scan, the Terason software changes the set of available softkey
controls. For example, if you scanned in 2D mode, when you freeze the image, the
softkeys include Trace, Ellipse, and Caliper.
When you save an image, all measurements are saved with the image.
You can create measurements on the currently acquired image (with frames stored
temporarily).
To make measurements on scanned images, you must understand:
•
•
•
•
•
•
•
Measurement Results Display Location on page 107
Measurement Sets; see page 108
Measuring in the 2D Window; see page 110
Measuring in the M-Mode Window; see page 115
Measuring in Spectral Doppler Modes; see page 116
Deleting Measurements; see page 117
Restoring All Measurement Groups to Defaults; see page 117
You can also make measurements on both screens when using Split Screen mode. See
Split-Screen Measurements on page 115.
To obtain a complete set of measurements, you often have to acquire multiple scans. You
can make as many scans and measurements as required for the study without losing any
measurements. Measurements remain on the Imaging window until you:
•
•
•
•
•
Select a different exam
Select a different scan mode
Load a different patient
Press the Delete softkey
Press the Clear All softkey
Measurement Results Display Location
The default location for the display of measurement results is the top left of the image. To
move the results to the bottom of the image, press the Results softkey. You can also
change the default location to the bottom of the image using the Result Display Location
radio buttons on the Setup/Measurements window.
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Chapter 6 - Working With Measurements
Measurement Sets
Measurement Sets
When you choose an exam preset, the Terason software makes a default set of
measurements available. The default set may vary from one supported probe to another.
You can also add custom measurements to the available lists. See:
• Default Measurement Sets on page 108
• Customizing Measurement Sets on page 108
• Setting Measurement Defaults on page 168
Default Measurement Sets
The system loads a set of measurements tailored for the preset you’ve selected. The
measurements are selected using the Calc softkey.
To select a measurement type, press the Calc softkey, and click the desired measurement.
Customizing Measurement Sets
If the default measurement set does not include a measurement you need, you can
customize the set.
To add an available measurement to the Current Measurement List, complete these
steps:
1. Click the Setup button.
The Setup window opens.
2. Click the Measurements tab.
The Setup/Measurements window opens.
Setup/Measurements Window
3. Click Configure Measurements.
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Measurement Sets
The Configure Measurements window opens.
Configure Measurements Window
4. To configure the Spectral Doppler measurement sets, click Spectral. Otherwise,
proceed to the next step.
5. In the Available Measurements area, select the desired measurements.
• To select a sequence of measurements, click the first measurement, press and hold
the Shift key, then click the last measurement in the sequence. The first and last
measurement and all the ones in between are selected.
• To select multiple measurements that are not in sequence, press and hold the
Control key, then click each of the desired measurments.The measurements you
clicked when the Control key was down are selected.
6. Click the right-pointing arrow button.
The selected measurements are added to the Current Measurement List.
7. Click OK.
8. On the Setup/Measurements window, click OK (or Apply, if you need to add custom
measurements).
To add a custom measurement to the Current Measurement List, complete these
steps:
1. Click the Setup button.
The Setup window opens.
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Measuring in the 2D Window
2. Click the Measurements tab.
The Setup/Measurements window opens. (See Setup/Measurements Window on
page 108.)
3. Click Configure Measurements.
The Configure Measurements window opens. (See Configure Measurements Window
on page 109.)
4. Click Add.
The Custom Measurement window opens.
Custom Measurement Window
5. In the Measurement: menu, select a measurement type.
6. In the Name: field, type a name for the custom measurement.
7. Select the tool used for the custom measurement by clicking the appropriate radio
button.
8. Click OK.
9. In the User Measurements area of the Configure Measurements window, click the new
measurement to select it.
10. Click the right-pointing arrow button.
11. Click OK.
12. On the Setup/Measurements window, click OK.
Measuring in the 2D Window
When you freeze a 2D scan, the Terason software displays softkeys and a Gain Knob
menu for measuring, printing, and playing loops in 2D mode.
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Measuring in the 2D Window
2D Mode Measure Softkeys (When Scan is Frozen)
The Measure function in the 2D window allows:
•
•
•
•
Measuring Distances; see page 111
Measuring Elliptical Circumference and Area; see page 112
Tracing Areas on the Image; see page 113
Split-Screen Measurements; see page 115
In general, select what you want to measure from the menu of Measurements. If you select
a specific measurement, such as Area, only the softkeys that work with that measurement
are available.
Measuring Distances
To measure a distance in the 2D window, complete the following steps:
1. If the image is live, press the Live/Freeze key
.
The image freezes and the softkey controls change.
2. To measure a detailed area with precision, use the Zoom function (see Enlarging an
Area of the Image on page 52) to enlarge an area of the 2D scan.
3. Press the Caliper softkey.
4. Click where you want to start measuring, move the target cursor, and click where you
want to finish measuring.
The Terason software displays the results in the top left corner of the 2D window.
Distance Measurement on an Image
If you do not see the measurement value, select Setup > General > Measurement Value.
To make more than one measurement of the same type on an image, press the
appropriate softkey again, then make the additional measurement.
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Measuring in the 2D Window
When making a series of 2D measurements using the Caliper softkey, you can keep the
caliper active by checking the Keep caliper active box on the Setup/Measurements
window (see Setup/Measurements Window on page 108). When the box is checked, a new
caliper cursor appears when you set the end point of a caliper measurement. When you
finish making measurements, save the image, then press the Live/Freeze key to turn off
caliper measuring.
Measuring Elliptical Circumference and Area
You can use either the Ellipse softkey or the Trace softkey to measure a circumference on
the image. To measure an oval area, use the Ellipse softkey. To measure the area of an
irregular shape, use the Trace softkey. See Tracing Areas on the Image on page 113 for
instructions on using the trace tool.
To measure a small area, use the Zoom function before you measure.
To use the ellipse tool to measure an elliptical area, complete the following steps:
1. If the image is live, press the Live/Freeze key
.
The image freezes and the softkey controls change.
2. Press the Calc softkey.
The Measurements menu opens.
Measurements Menu
3. Select the measurement type by clicking it in the Measurements menu.
If you select Circumference from the Measurement menu, the Ellipse tool is
automatically activated.
4. Position the target cursor at one end of the area that you want to measure and click.
5. Move the target cursor to the other end of the desired area, and click.
The Terason software displays a green line and shows the circumference or area
values at the top of the image.
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Measuring in the 2D Window
Ellipse Measurement on an Image
If the measurement value does not show on your computer, select Setup > General >
Measurement Value.
6. To adjust the other axis of an ellipse, press the Trackball Arbitration key
so
that Axis is highlighted (above the softkey display), then use the trackball to adjust the
width of the ellipse.
7. When the measurement is correct, press the Left key to lock it in place.
You cannot change a measurement after locking it in. You can now make another
measurement without deleting the measurements you’ve locked in.
8. To save the measurements, press the Save Image key
.
The image is saved with all measurements.
Tracing Areas on the Image
The Terason software lets you measure an area by tracing the contour of any shape on an
image. You can also use the Ellipse tool to measure an area (see Measuring Elliptical
Circumference and Area on page 112 for instructions.)
You can use the trace tool to:
• Trace an irregular shape by sketching the outline
• Draw a polygon by clicking on corners of the shape
You can also combine these methods to trace an area on the image.
To trace an area on an image, complete the following steps:
1. If the image is live, press the Live/Freeze key
.
The image freezes and the softkey controls change.
2. Use one of the following methods to select the trace tool:
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Measuring in the 2D Window
• Press the Trace softkey.
• Select Area from the Measurement menu.
3. To trace an outline:
a. Click where you want to start measuring.
b. Use the trackball to drag the tracing cursor around the object you want to trace.
Tracing an Outline
c. When your trace is nearly complete, press the Left button, and the software
completes the loop by drawing a straight line from the current cursor position to the
starting point.
Trace Measurement on an Image
When you press the Left key, the trace turns white, and can no longer be edited.
Before you click the Left key, you can reverse the track of the cursor to delete parts of
the trace.
4. To edit the uncompleted trace:
a. Press the Trackball Arbitration key
Softkey display.
, so that Erase is highlighted above the
b. Use the trackball to erase the unwanted part of the trace, from most recent back
toward the beginning.
c. When all the unwanted parts of the trace are erased, press the Trackball
Arbitration key again that Draw is highlighted above the Softkey display.
d. Use the trackball to finish the trace.
e. Press the Left key to complete the trace.
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Measuring in the M-Mode Window
Split-Screen Measurements
When measuring in Split Screen mode (see Working With Split Screen Mode on page 54),
all measurements are displayed in a single list, even if both screens contain measurements.
You can make a measurement on either screen or across both screens.
To make alternating measurements on split screens, you must Disable Return to live
imaging:
1. Click Setup.
2. Click the Display tab.
3. Click Return to live imaging on toggle active screen, so that the box is not
checked.
4. Click OK.
This allows you to make a measurement on one screen, switch to the other screen and
make a measurement there, then return to the first screen and make additional
measurements. If the box in the Setup/Display window is checked, returning to the first
screen makes it live and erases all measurements on it.
To make a measurement across both screens:
1. Disable Return to live imaging, as described above.
2. Freeze a scan on one screen.
3. Press the Toggle Screen softkey.
4. Freeze a scan on the other screen.
5. Press the measuring tool softkey for the tool you need.
6. Click the start point of the measurement.
7. Click the end point of the measurement.
8. Press the Left key.
Measuring in the M-Mode Window
When you freeze an M-mode scan, the Terason software displays softkeys and a Gain
Knob menu for measuring, printing, and playing loops in M-mode.
M-Mode Measure Softkeys (When Scan is Frozen)
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Measuring in Spectral Doppler Modes
Making M-Mode Measurements
In the Time Series window of an M-Mode scan, you can measure:
• Heart rate (HR)
• Distance (includes time over distance [TD] and Slope values)
To measure in the M-Mode Time Series window, complete the following steps:
1. Press the Live/Freeze key
.
2. Use the softkeys to select a measurement type.
3. Click the target cursor where you want to start measuring.
4. Move the target cursor and click at the desired end location. The measurement
displays at the top left of the Time Series window.
M-Mode Measurement
5. Print and save the image, if required.
Measuring in Spectral Doppler Modes
When you freeze a Pulsed-Wave Doppler or Triplex scan, the Terason software changes
the softkeys to allow measurement, printing, and other functions.
PWD Measurement Softkeys
The Measurement section of the panel controls the following measurement operations:
•
•
•
•
Velocity
Time
Slope
Calc
You can use the CA (correction angle) softkey and the 0/+-60 softkey to adjust the angle
on the frozen scan. This function works the same as the Correction Angle on the PWD tab
as described in Adjusting the Correction Angle on page 78.
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Deleting Measurements
If you have added 2D measurements to the Spectral measurement set (see Customizing
Measurement Sets on page 108), you can perform 2D measurements in Spectral Doppler
imaging screens.
To make 2D measurements on Spectral Doppler imaging screens, press the Calc
softkey. Any 2D measurements you have added to the Spectral measurement set appear in
a Measurements menu at the top right corner of the imaging screen. See Measuring in the
2D Window on page 110 for instructions in making 2D measurements.
Deleting Measurements
You can delete the most-recent measurement, or you can delete all measurements on the
current image.
To delete the most recent measurement, press the Delete softkey.
To delete all measurements, press the Clear All softkey.
Restoring All Measurement Groups to Defaults
To restore all measurement groups to the defaults:
1. Click Setup.
2. Click the Measurements tab.
3. Click the Configure Measurements... button.
4. Click the Restore button.
5. Click OK.
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