GE Logiq P5 User Manual
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Vascular Measurements LOGIQ 5 Basic User Manual 11-11 Direction 2300002-100 Rev. 2 A/B Ratio In B-Mode and M-Mode, you can calculate A/B ratio by diameter or by area. DiameterTo calculate A/B ratio by diameter: 1. From the Generic Touch Panel, select A/B Ratio. 2. Select ratio(Diam). The system displays an active caliper. 3. Make a distance measurement of the first velocity. The system displays an active caliper for the second distance measurement. 4. Make a distance measurement of the second velocity. The system displays each distance measurement and the A/B ratio in the Results Window. NOTE: The first caliper is the A velocity. The second caliper is the B velocity. For details on how to make a distance measurement, See ‘Distance measurement’ for more information. AreaTo calculate A/B ratio by area: 1. From the Generic Touch Panel, select A/B Ratio. 2. Select ratio(Area). The system displays a trace caliper. 3. Make a trace measurement of the A velocity. NOTE: To erase an open trace, move the Trackball. The system displays a second trace caliper. 4. Make a trace measurement of the B velocity. The system displays the two area measurements and the A/B ratio in the Results Window. For details on how to make a trace measurement, See ‘Circumference and area (trace) measurement’ for more information.
Vascular 11-12 LOGIQ 5 Basic User Manual Direction 2300002-100 Rev. 2 M-Mode Measurements Figure 11-4. M-Mode Touch Panel NOTE: The following instructions assume that you first scan the patient and then press Freeze.
Vascular Measurements LOGIQ 5 Basic User Manual 11-13 Direction 2300002-100 Rev. 2 % Stenosis In M-Mode, you measure % Stenosis by diameter. NOTE: Always take the measurement from a cross-sectional view of the vessel. 1. Select % Stenosis. The system displays an active caliper. 2. Make a distance measurement of the inner area of the blood vessel: a. To position the active caliper at the start point, move the Trackball. b. To fix the start point, press Set. The system fixes the first caliper and displays a second active caliper. c. To position the second active caliper at the end point, move the Trackball. A dotted line connects the measurement points. d. To complete the measurement, press Set. The system displays the distance value in the Results Window and displays an active caliper for the second distance measurement. 3. To make a distance measurement of the outer area of the blood vessel, repeat steps a–d. The system displays each distance measurement and the % Stenosis in the Results Window. For the diameter calculation, do NOT take a distance measurement from a longitudinal view. This may lead to an inaccurate assessment of % stenosis.
Vascular 11-14 LOGIQ 5 Basic User Manual Direction 2300002-100 Rev. 2 A/B Ratio In M-Mode you can measure A/B ratio by diameter, time, or velocity. DiameterTo calculate A/B ratio by diameter: 1. Select A/B Ratio. 2. Select ratio(Diam). The system displays an active caliper. 3. Make a distance measurement of the first velocity. a. To position the active caliper at the start point, move the Trackball. b. To fix the start point, press Set. The system fixes the first caliper and displays a second active caliper. c. To position the second active caliper at the end point, move the Trackball. A dotted line connects the measurement points. d. To complete the measurement, press Set. The system displays the distance value in the Results Window and displays an active caliper for the second distance measurement. 4. To make a distance measurement of the second velocity, repeat steps a–d. The system displays each distance measurement and the A/B ratio in the Results Window. NOTE: The first distance measurement is the A velocity. The second distance measurement is the B velocity.
Vascular Measurements LOGIQ 5 Basic User Manual 11-15 Direction 2300002-100 Rev. 2 A/B Ratio (continued) TimeTo calculate A/B ratio by time: 1. Select A/B. 2. Select ratio(Time). The system displays an active caliper. 3. To position the caliper at the A point, move the Trackball. 4. To fix the measure point, press Set. The system displays a second active caliper. 5. To position the second caliper at the B point, move the Trackball. 6. To complete the measurement, press Set. The system displays the two time measurements and the A/ B ratio in the Results Window. Ve l o c i tyTo calculate AB ratio by velocity: 1. Select A/B. 2. Select ratio(Velocity). The system displays an active caliper with vertical and horizontal dotted lines. 3. To position the caliper at the A velocity, move the Trackball. 4. To fix the measure point, press Set. The system displays a second active caliper. 5. To position the second caliper at the B velocity, move the Trackball. 6. To complete the measurement, press Set. The system displays the two velocity measurements and the A/B ratio in the Results Window.
Vascular 11-16 LOGIQ 5 Basic User Manual Direction 2300002-100 Rev. 2 Doppler Mode Measurements Figure 11-5. D-Mode Touch Panel Example Control Assignment Cancel TransferAfter the Auto Vascular calculation results are assigned to a particular vessel, the user can cancel the assignment and assigned parameters are removed from Worksheet and Report page. When Cancel Transfer occurs, a message appears on the screen to indicate the value was erased from Worksheet and Report page. Vessel locationIf the vessel has a location, you can select one of the following: • Proximal (Prox) • Middle (Mid) • Distal (Dist) Side Rt/LtThe system has measurements for the patients right and left side. To select right or left, adjust the Touch Panel knob. TAMAX AUTO/ MANUALTo select Auto Doppler Trace or Manual Doppler Trace at the time you are making a measurement, adjust the Touch Panel knob. • Select AUTO – the system traces the peak velocity envelope from the begin time to the end time. • Select MANUAL – trace the waveform manually.
Vascular Measurements LOGIQ 5 Basic User Manual 11-17 Direction 2300002-100 Rev. 2 Control Assignment (continued) Modify Auto CalcsWhen you select this key, the Modify Calculation menu is displayed as below. In this menu, you select parameters to display in the Auto Vascular Calculation window. Only parameters that can be used by the calculation are displayed. Select Save as Default to save the selected parameters as the default calculations for this application. Select Return to return to the previous Touch Panel screen. If you select PV, all selected parameters are turned off. When you deselect PV, the system returns to the previously selected calculation. Figure 11-6. Modify Auto Calculation Menu (Page1)
Vascular 11-18 LOGIQ 5 Basic User Manual Direction 2300002-100 Rev. 2 Naming format for vessels When you want to measure a vessel, on the Touch Panel you select the folder for the vessel. Many vessel folders are labeled with an abbreviation. The following table lists abbreviations used for naming vascular vessels. Table 11-2: Vascular Vessel Abbreviations AcronymName ACA Anterior Cerebral Artery AComA Anterior Communicating Artery Axill Axillary Artery Axill V Axillary Vein BA Basilar Artery Basil V Basilic Vein Brac V Brachial Vein CCA Common Carotid Artery Ceph V Cephalic Vein CHA Common Hepatic Artery Com Femoral Common Femoral Artery Com Iliac Common Iliac Artery Com Iliac A Common Iliac Artery Dors Pedis Dorsalis Pedis ECA Exterior Carotid Artery Ext Iliac External Iliac Artery ICA Internal Carotid Artery (Transcranial Doppler) ICA Interior Carotid Artery (Carotid Artery) IMA Inferior Mesenteric Artery Inno V Innominate Vein IVC Inferior Vena Cava MCA Middle Cerebral Artery Mcub V Median Cubital Vein Mid Hep V Middle Hepatic Vein MRA Main Renal Artery
Vascular Measurements LOGIQ 5 Basic User Manual 11-19 Direction 2300002-100 Rev. 2 PCA Posterior Cerebral Artery PComA Posterior Communicating Artery SMA Superior Mesenteric Artery SMV Superior Mesenteric Vein SUBC Subclavian Artery SUBC V Subclavian Vein Sup Femoral Superficial Femoral Artery TCD Transcranial Doppler TIPS Transjugular Intrahepatic Portosystemic Shunt VERT Vertebral Artery Table 11-2: Vascular Vessel Abbreviations AcronymName
Vascular 11-20 LOGIQ 5 Basic User Manual Direction 2300002-100 Rev. 2 Auto Vascular Calculation Overview Auto Vascular Calculation enables the LOGIQ 5 to detect and identify a cardiac cycle. It allows you to assign measurements and calculations during live timeline imaging, while the image is frozen, or in CINE. Peak values are detected for venous flow. During cardiac cycle detection, the system identifies the cardiac cycle using calipers, vertical bars, and/or highlighting of timeline data. Use of identifiers is based on measurements and calculations selected by an operator for the current application. The system may place calipers at early systolic peak, peak systole, minimum diastole and end diastole. Vertical bars may also be placed to indicate the beginning and end of the cardiac cycle. The peak and/or mean trace may be highlighted. You can edit the cardiac cycle identified by the system or select a different cardiac cycle. You can select the calculations to be displayed in the M&A Result window during live scanning or on a frozen image. These calculations are displayed at the top of M&A Result Window located adjacent to the image. These calculations are presettable by application which means you can set up the default calculations to be displayed for each application.