Measurements

Measurements can be made in the Clarius App when on the live imaging screen after the image has been frozen, as well as on a captured image prior to the exam being completed.

To see a video tutorial, please visit the Clarius Classroom on Measurements.

To access measurements, tap the Tools icon  from the bottom menu and select the appropriate measurement tool. Multiple measurement tools are available for use, availability of tools depends on the imaging mode and application selected.

Measurements are performed by placing 1 or more calipers on the screen, that make up the full measurement once all calipers are placed. The center of the crosshairs of the caliper correlate to the ultrasound pixel that is focused on for making the exact measurement. For each caliper placed, a small circular hit region will be created so that caliper adjustment can be made without your finger covering the caliper crosshair.

Once one or more measurements have been performed, ensure to press the still image icon to store the image with associated measurements.

Generic B-Mode Measurements

The following measurements can be found under the General tab of measurements menu.

Distance	Multi-Distance
Requires 2 calipers to be placed and measures distance between the calipers.	Similar to distance but allows up to 5 distances to be made consecutively.

Ellipse	Trace
Requires 2 calipers to be placed, with an additional to 2 calipers automatically placed for adjusting the short axis. Outputs circumference and area.	Requires 1 caliper to be placed, then a drag around the area of measurement. Once released, the 2nd caliper is placed, and both calipers can modified to continue or reverse the trace. Outputs distance and area.

Angle

Requires 3 calipers to be placed and measures the angle between the 2 lines.

Specialized B-Mode Measurements

The following measurements are not located under the General measurements tab, but rather the Application tab. They provide specialized tools for making application specific measurements and calculations.

Hip Angle (MSK)	D/W Ratio (Diagnostic Breast)
Allows for the placement of 3 separate lines to automatically create the alpha and beta angles associated with a pediatric hip angle measurement.	Allows the placement of 2 separate distances that remain perpendicular to each other, to ultimately calculate the depth to width ratio.

Volume (Multiple Applications)
Allows for the placement of 3 separate distances to automatically create the appropriate volume calculation of L x W x H x (π / 6). Typically one view of the anatomy is captured with 2 distances, and a second view is captured with the 3rd and final distance to output the calculated volume. Common volume measurements may be performed for nodules, lesions, and other organs. Note that volume measurements only require that the tool be activated once, where the workflow should follow: Acquire view and freeze Activate volume tool Create 2 distance measurements (D1 & D2) Capture image Acquire new view and freeze Create final distance measurement (D3) Capture image

Automated B-Mode Measurements

The following measurements are not located under the General measurements tab, but rather the Application tab. They provide specialized automated tools for making application specific measurements and calculations.

Bladder Volume (Bladder)
The automated bladder volume tool allows for a single touch on the screen to automatically trace the bladder outline and create one or more distance measurements. After the measurements have been placed, calipers can be adjusted if necessary. Note that bladder volume measurements only require that the tool be activated once, where the workflow should follow: Acquire view and freeze Activate bladder volume tool Tap center of bladder (2 distances should be placed) Adjust calipers if necessary Capture image Acquire new view and freeze Tap center of bladder (final distance should be placed) Adjust calipers if necessary Capture image

Follicle (IVF)
The automated follicle tool allows for a single touch on the screen to automatically trace a follicle outline and create two distance measurements. Once the measurements have been placed, calipers can be adjusted if necessary. Both distances are averaged to display the average in real-time. Note that follicle measurements cascade, and only require that the tool be activated once, where the workflow should follow: Acquire view and freeze Activate follicle tool Tap center of follicle (2 distances should be placed) Adjust calipers if necessary Repeat step 3 and 4 for multiple follicles within image Capture image Acquire new view and freeze Repeat steps 3 through 7 as required

Spectral Measurements

M-Mode and Pulsed Wave Doppler imaging modes also have specific measurement tools that can be used on their respective spectral displays. M-Mode plots distance vs time, whereas spectral Doppler plots velocity vs time.

M-Mode Tool Selection	Pulsed Wave Doppler Tool Selection

In both modalities, time and heart rate are available to measure across the horizontal axis. See the Heart Rate Measurement guide for more detailed information.

Vertically, M-Mode will measure distance, where Doppler will measure velocity. In spectral Doppler mode, a single velocity measurement can be made, or a dual velocity measurement can be performed to place caliper both for the peak systolic (PSV) and end diastolic velocity (EDV). Adding the dual velocity measurement will also automatically calculate resistive index (RI) and S/D Ratio (SD) for display and reporting.