GE Logiq P5 User Manual
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Optimizing Color Flow LOGIQ 5 Basic User Manual 5-37 Direction 2300002-100 Rev. 2 Activating Power Doppler Imaging (PDI) To activate PDI, 1. Press PDI. The color flow window appears over the B-Mode image. Move the Trackball to move the CF window. To exit, press PDI or select a new mode. Uses Power Doppler Imaging is a color flow mapping technique used to map the strength of the Doppler signal coming from the flow rather than the frequency shift of the signal. Using this technique, the ultrasound system plots color flow based on the number of blood cells that are moving, regardless of their velocity. Because it does not map velocity, it is not subject to the aliasing.
Optimizing the Image 5-38 LOGIQ 5 Basic User Manual Direction 2300002-100 Rev. 2 Color Flow and Power Doppler Displays Figure 5-10. Power Doppler Imaging Display ItemDescription 1 Color Flow Region of Interest (ROI) 2 Color Flow Parameters: Frequency, Gain, Power Output, PRF, Wall Filter, and Packet Size 3 Color Flow Bar ItemDescription 1 Color Flow Region of Interest (ROI) 2 Color Flow Parameters: Frequency, Gain, Power Output, PRF, Wall Filter, and Packet Size 3 Color Flow Bar
Optimizing Color Flow LOGIQ 5 Basic User Manual 5-39 Direction 2300002-100 Rev. 2 Color Flow Scanning Hints HINTSColor Flow Mode controls produce the following results: Line Density. Trades frame rate for sensitivity and spatial resolution. If the frame rate is too slow, reduce the size of the region of interest, select a different frame rate setting, or reduce the packet size. Wall Filter. Affects low flow sensitivity versus motion artifact. Color Threshold. Percentage of gray scale level where color Doppler is overwritten. Frame Average. Affects temporal smoothing and color Doppler `robustness. Ace. Ace versus normal affects motion artifact control. Packet Size. Affects the amount of color Doppler sensitivity versus frame rate. Scan Area. Increases/decreases size of color window. Focus Position. The best focusing is at the focal zone location. Put focal zone(s) at the area of interest. Auto Optimize. Optimizes the Color Flow ROI by adjusting the Color Flow or PDI maps and thresholds and PDI compression curves. AUTO improves overall color sensitivity, especially in low-flow states. This improves the color performance while reducing optimization time.
Optimizing the Image 5-40 LOGIQ 5 Basic User Manual Direction 2300002-100 Rev. 2 Color Flow Mode Touch Panel Figure 5-11. Color Flow Mode Touch Panel, Page 1 Figure 5-12. Color Flow Mode Touch Panel, Page 2
Optimizing Color Flow LOGIQ 5 Basic User Manual 5-41 Direction 2300002-100 Rev. 2 PDI (Power Doppler Imaging) Mode Touch Panel Figure 5-13. PDI Mode Touch Panel, Page 1 Figure 5-14. PDI Mode Touch Panel, Page 2
Optimizing the Image 5-42 LOGIQ 5 Basic User Manual Direction 2300002-100 Rev. 2 Gain DescriptionGain amplifies the overall strength of echoes processed in the Color Flow window or spectral Doppler timeline. AdjustingGain values change depending on the probe and application; they are not associated with a particular position of the button. To decrease/increase Gain, adjust the dial to the left/right. Va l u e sValues vary by probe, application, and multi frequency setting. Gain displays as dB. Gain values are returned to the factory or user preset value when you change the following: Probe, Exam Category, Exam Calcs, New Patient, or Multi Frequency. BenefitsAllows you to control the amount of color within a vessel or to fill in or clean out spectral information. BioeffectsGain has no affect on Power Output. However, with increased Gain, the output level can usually be reduced to produce an equivalent image quality. PRF (Pulse Repetition Frequency) DescriptionRaises/lowers the PRF on the color bar. AdjustingTo raise/lower the velocity scale, press PRF/Wall Filter until you reach PRF, then adjust PRF left/right. Va l u e sVelocity range is in kHz. PRF values are returned to the factory or user preset value when you change the following: Probe, Exam Category, Exam Calcs, or New Patient. BenefitsImaging of higher velocity flow requires increased scale values to avoid aliasing. Affect on other controlsChanging the PRF may affect Power Output, frame rate, and wall filter. When you adjust the velocity scale, CINE memory is cleared. BioeffectsChanging the PRF range may change the TI and/or MI. Observe the output display for possible effects.
Optimizing Color Flow LOGIQ 5 Basic User Manual 5-43 Direction 2300002-100 Rev. 2 Wall Filter DescriptionFilters out low flow velocity signals in order to hide unusable motion. It helps get rid of motion artifacts caused from breathing and other patient motion. AdjustingTo raise/lower the wall filter, press PRF/Wall Filter until you reach Wall Filter, then adjust Wall Filter left/right. Va l u e sValues vary, depending upon probe, application, and packet size. The wall filter is shown graphically on the color bar and is displayed numerically on the monitor (cm/s). Wall Filter values vary by probe and application and are returned to factory or user preset value when you change: Probe, Exam Category, Exam Calcs, or New Patient. BenefitsGets rid of excess, unnecessary low frequency signals caused by motion. Scan Area DescriptionScan Area sizes and positions the color window. AdjustingThe window grows from the center of the color flow window. To adjust the size, press Scan Area (Size appears in the Trackball Status area on the monitor display) then move the Trackball left/ right, up/down. To adjust the position, press Scan Area (Pos appears in the Trackball Status area on the monitor display) then move the Trackball to position the color window. Va l u e sSector and Convex Probes. Ranges from 20 degrees to 120 degrees in 1 degree to 2 degree increments. Linear Probe. Ranges from 10% to full B-Mode image. BenefitsIncrease the color window to see a larger area; decrease the color window to improve frame rate. Affect on other controlsThe smaller the color window, the faster the frame rate and vice versa. BioeffectsSizing the color window may change the TI and/or MI. Observe the output display for possible effects.
Optimizing the Image 5-44 LOGIQ 5 Basic User Manual Direction 2300002-100 Rev. 2 Invert (Color Invert) DescriptionLets you view blood flow from a different perspective, e.g., red away (negative velocities) and blue toward (positive velocities). You can invert a real-time or frozen image. NOTE: Invert reverses the color map, NOT the color PRF. AdjustingTo reverse the color flow, press Invert (Color Invert) . In Triplex, both Color Flow and Doppler Mode velocity scales are inverted. Va l u e sInvert and non-Invert. Values vary by probe and application. Invert values are returned to the factory or user preset value when you change the following: Probe, Exam Category, Exam Calcs, or New Patient. BenefitsAllows you to view blood flow according to your personal preference. Baseline DescriptionChanges the Color Flow or Doppler spectrum baseline to accommodate higher velocity blood flow. Minimizes aliasing by displaying a greater range of forward flow with respect to reverse flow, or vice versa. Baseline adjusts the alias point. The default baseline is at the midpoint of the color display and at the midpoint of the color bar reference display. AdjustingTo adjust the baseline, adjust Baseline left/right, as necessary. Va l u e sZero velocity follows the baseline. The total PRF range remains the same. Values vary by probe and application. Baseline values are returned to the factory or user preset value when you change the following: Probe, Exam Category, Exam Calcs, or New Patient. BenefitsUnwraps the alias during color flow imaging. Higher velocities can be displayed without reversal of colors.
Optimizing Color Flow LOGIQ 5 Basic User Manual 5-45 Direction 2300002-100 Rev. 2 Angle Steer and Fine Angle Steer DescriptionYou can slant the B-Mode or Color Flow linear image left or right to get more information without moving the probe. AdjustingTo slant the linear image to the left/right, adjust Angle Steer. Press Angle Steer to access Fine Angle Steer. Va l u e sLinear probes can be steered left, center, or right up to a maximum of 20 degrees, depending on the probe. Angle Steer values vary by probe and application and are returned to factory or user preset value when you change: Probe, Exam Category, Exam Calcs, or New Patient. Fine Angle Steer steers the Doppler cursor left/right 30 degrees in one degree increments. BenefitsProvides a Doppler cursor angle suitable for linear probe orientation. Beneficial in Vascular applications. BioeffectsActivating angle steer may change the TI and/or MI. Observe the output display for possible effects. Color Flow Line Density DescriptionOptimizes the Color Flow frame rate or spatial resolution for the best possible color image. AdjustingTo adjust the line density, press Line Density Touch Panel key. Va l u e sThe current frame rate is shown on the Touch Panel. Frame Rate/Resolution values vary by: Probe, Exam Category, Exam Calcs, New Patient, and Frequency. Settings are returned to factory or user preset value when you change any of the above. BenefitsFrame rate is useful in fetal heartbeat, adult cardiac applications and in clinical Radiology applications requiring significantly higher frame rates. High resolution is useful in situations where very small vessels are being imaged, e.g., thyroid, testicles. Affect on other controlsFrame rate changes the vector density and frame rate. BioeffectsActivating color flow frame rate/high resolution may change the TI and/or MI. Observe the output display for possible effects.
Optimizing the Image 5-46 LOGIQ 5 Basic User Manual Direction 2300002-100 Rev. 2 Map DescriptionBrings out the tissue behind the color map. AdjustingPress Duplex to adjust. Va l u e sOn/Off. Variance Maps (VV). Provides a measure of turbulence (stenosis). Adds green to velocity maps. Symmetric Velocity Imaging Map. Map V3 shows both positive and negative velocities using the same colors. BenefitsShows the direction of the flow and highlights the higher velocity flows.