GE Logiq P5 User Manual
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Optimizing B-Mode LOGIQ 5 Basic User Manual 5-7 Direction 2300002-100 Rev. 2 Gain DescriptionB-Mode Gain increases or decreases the amount of echo information displayed in an image. It may have the effect of brightening or darkening the image if sufficient echo information is generated. AdjustingGain values vary depending on the probe; they are not associated with a particular position of the knob. NOTE: B-Mode gain is independent of M-Mode and Doppler and Color Flow Gain. Changing the gain while in M-Mode does not affect the B-Mode image gain. To decrease/increase Gain, adjust dial to the left/right. Va l u e sGain displays on the monitor in G (dB). Gain increments by 1 dB. Maximum gain varies by probe. The current gain value is displayed. Gain values vary by probe, application, and frequency setting. NOTE: Maximum gain is factory preset to an optimum setting to eliminate noise in the display. Gain values are returned to the factory or user preset value when you change the following: Probe, Exam Category/Exam Calc, New Patient, or Frequency. BenefitsGain allows you to balance echo contrast so that cystic structures appear echo-free and reflecting tissue fills in. Affect on other controlsAfter you adjust the Power Output, you may need to adjust the gain. Generally speaking, if you increase the Power Output, you need to decrease the gain; if you decrease the Power Output, you need to increase the gain. Gain and TGC interact by adding together. BioeffectsGain has no affect on Power Output. However, with increased gain, the output level can usually be reduced to produce an equivalent image quality. NOTE: Always optimize gain before increasing the Power Output.
Optimizing the Image 5-8 LOGIQ 5 Basic User Manual Direction 2300002-100 Rev. 2 Focus DescriptionIncreases the number of focal zones or moves the focal zone(s) so that you can tighten up the beam for a specific area. A graphic caret corresponding to the focal zone position(s) appears on the right edge of the image. AdjustingTo increase/decrease the number of focal zones, adjust Focus Number. NOTE: Focus Position and Focus Number share the same control. Press the control to toggle between Focus Position and Focus Number. To move the focal zone to the near/far field, adjust Focus Position. NOTE: Each adjustment cycles you to the next setting. Va l u e sEight focal zones over twelve focal positions. In B Flow only one focus zone. Focus zone number and position vary depending on the depth, zoom, probe, application, and frequency setting selected. Focal zone number values are returned to the factory or user preset value when you change the following: Probe, Exam Category, Exam Calc, or New Patient. BenefitsFocus optimizes the image by increasing the resolution for a specific area. Affect on other controlsChanging the focal number affects the frame rate. The greater number of focal zones, the slower the frame rate. BioeffectsChanging the focal zone may change the TI and/or MI. Observe the output display for possible effects.
Optimizing B-Mode LOGIQ 5 Basic User Manual 5-9 Direction 2300002-100 Rev. 2 Auto Optimize (Auto) DescriptionAuto lets you optimize the image based upon a specified region of interest or anatomy within the B-Mode image or Spectral Doppler in order to improve the contrast of the displayed image data. Auto Optimize is available in B-Mode, specifically in single or multi image, on live, frozen or CINE images, and while in zoom and in Spectral Doppler. However, it is not available in Display Zoom or while CINE is playing a CINE Loop. Auto in Doppler Mode optimizes the spectral data. Auto adjusts the Velocity Scale/PRF, baseline shift, dynamic range, gray maps, and invert (if preset). The benefit of Auto can be found in reduced optimization time and a more consistent and accurate optimization process. Upon deactivation, the spectrum is returned to the original map and dynamic range; however, the velocity scale, baseline, and angle is still optimized. AdjustingTo activate, press the left Auto control. Va l u e sAuto Optimize is active until you deactivate it. However, Auto Optimize values are returned to the factory or user preset value when you change the following: Probe, Exam Category, Exam Calc, New Patient, or Multi Frequency. Affect on other controlsYou may need to adjust the Gain.
Optimizing the Image 5-10 LOGIQ 5 Basic User Manual Direction 2300002-100 Rev. 2 B Flow DescriptionB Flow is intended to provide a more intuitive representation of non-quantitative hemodynamics in vascular structures. B Flow is available on the 10L probe. All B-Mode measurements are available with B Flow active: depth, distance along a straight line, % stenosis, volume, trace, circumference, and enclosed area. ActivatingTo activate/deactivate B Flow, press B Flow. Doppler Mode is available while in B Flow; however, M-Mode and Color Flow/PDI Modes are not available. See Chapter 17 for probe availability. Using B FlowTo optimize the image: Scanning HintsB Flow is especially intuitive when viewing blood flow, for acute thrombosis, parenchymal flow, and jets. B Flow helps you visualize complex hemodynamics and highlights moving blood and tissue. B Flow was implemented using Digitally Encoded Ultrasound (DEU). There are no artifacts such as bleeding, blooming, or aliasing. The greater the speed, the better the image scatter density and size. If the scan direction is the same as the flow direction, then the image scatter is elongated; if the scan direction is the opposite as the flow direction, then the image scatter is tighter. Therefore, have the scan direction opposite to that of flow direction. Switch the way you hold the probe, with the probe orientation marker inferior to maintain correct orientation on the monitor. Flow starts from where the focal zone is located. Turn off the background when imaging the kidney, liver, and spleen. Keep the focal zone as close to flow as possible. It is beneficial to narrow the sector width and increase the frame rate.Table 5-2: B Flow Instructions StepInstructions 1. Adjust the gain, optimize the image for frame rate/resolution via Line Density, adjust the focal zone, zoom the image, colorize the image, adjust the field of view via Scan Area, select Auto.
Optimizing B-Mode LOGIQ 5 Basic User Manual 5-11 Direction 2300002-100 Rev. 2 B Flow (continued) BenefitsB Flow is less angle-independent, no velocity-aliasing artifacts, and provides better resolution when compared with Color Doppler Mode, and displays a full field of view. B Flow is therefore a more realistic (intuitive) representation of flow information, allowing you to view both high and low velocity flow at the same time. Affect on other controlsWhen you activate B Flow, the image remembers the imaging parameters set while in B-Mode. When you optimize the frame rate via Line Density, you compromise the resolution and when you optimize the resolution, you compromise the frame rate. B Flow is not available in 3DView. BioeffectsWhen you select B Flow, the PRF increases. Adjusting the following controls may affect the Power Output: Focal Zone Position, Depth, Zoom, Line Density, Scan Area, Frequency, or angle steer. Observe the output display for possible effects.
Optimizing the Image 5-12 LOGIQ 5 Basic User Manual Direction 2300002-100 Rev. 2 Coded Harmonic Imaging (CHI) DescriptionHarmonic imaging utilizes Digitally Encoded Ultrasound (DEU). Coded Harmonics enhances near field resolution for improved small parts imaging as well as far field penetration. AdjustingTo activate Coded Harmonic imaging, Press Harmonics. NOTE: Multi frequency is not active when the image is frozen. Va l u e sOn/Off. See Chapter 17 for probe availability. `CHI appears next to the active probe indicator. NOTE: Changing multi frequency resets those parameters which are presettable by frequency to their preset values for the current harmonic frequency. Multi frequency values are returned to the factory or user preset value when you change the following: Probe, Exam Category, Application, or New Patient. BenefitsCoded Harmonics diminishes low frequency high amplitude noise and improves imaging technically difficult patients. Coded Harmonics may be especially beneficial when imaging isoechoic lesions in shallow-depth anatomy in the breast, liver, and hard- to-visualize fetal anatomy. Coded Harmonics may improve B- Mode image quality without introducing a contrast agent. Affect on other controlsYou may need to change the field of view (Depth). DO NOT use contrast agents while in Coded Tissue Harmonics. BioeffectsActivating multi frequency mode may change the TI and/or MI. Observe the output display for possible effects.
Optimizing B-Mode LOGIQ 5 Basic User Manual 5-13 Direction 2300002-100 Rev. 2 Frequency DescriptionMulti Frequency mode lets you downshift to the probes next lower frequency or shift up to a higher frequency. AdjustingTo select a new frequency, 1. Select Frequency. 2. Select the desired frequency. Harmonic frequencies are currently available via Frequency. NOTE: Frequency change is not active when the image is frozen. The selected frequency appears in the upper, right-hand portion of the monitor display. NOTE: Changing frequency resets those parameters which are presettable by frequency to their preset values for the current frequency. Va l u e sVary, depending on the probe and application. Frequency values are returned to the factory or user preset value when you change the following: Probe, Exam Category, Exam Calcs, or New Patient. BenefitsThis optimizes the probes wide band imaging capabilities at multiple frequencies to image at greater depths. BioeffectsActivating multi frequency mode may change the TI and/or MI. Observe the output display for possible effects.
Optimizing the Image 5-14 LOGIQ 5 Basic User Manual Direction 2300002-100 Rev. 2 Virtual Convex DescriptionOn Linear and Sector probes, Virtual Convex provides a larger field of view in the far field. NOTE: Color Flow can be steered when in straight fire, but not in Virtual Convex. AdjustingTo activate/deactivate Virtual Convex, select Virtual Convex. Va l u e sOn/Off. BenefitsVirtual Convex can be especially helpful in Obstetrics. Available in B-Mode, Color Flow Mode, and Doppler Mode. BioeffectsActivating Virtual Convex may change the TI and/or MI. Observe the output display for possible effects. TGC DescriptionTGC amplifies returning signals to correct for the attenuation caused by tissues at increasing depths. TGC slide pots are spaced proportionately to the depth. The area each pot amplifies varies as well. A TGC curve may appear on the display (if preset), matching the controls that you have set (except during zoom and 90 degrees and 270 degrees rotate). You can choose to deactivate the TGC curve on the image. AdjustingTo decrease/increase TGC, move slide pot to the left/right. NOTE: On some systems, active slide pots backlight. TGC adjusts automatically when using zoom. The TGC curve does not change while in CINE. Va l u e sWhen you change the depth, TGC is rescaled across the new depth range. Each pot is proportionately scaled across the depth. BenefitsTGC balances the image so that the density of echoes is the same throughout the image.
Optimizing B-Mode LOGIQ 5 Basic User Manual 5-15 Direction 2300002-100 Rev. 2 Scan Area DescriptionYou can widen or narrow the size of the sector angle to maximize the images region of interest (ROI). AdjustingTo narrow/widen the angle, press Scan Area and move the Trackball. Va l u e sVaries, depending upon the probe (not applicable to linear probes) and application. BenefitsIncrease the sector angle to see a wide field of view; decrease the sector angle when you need to have a faster frame rate, as in fetal heartbeat. Affect on other controlsChanging the sector angle affects the frame rate. The narrower the sector angle, the faster the frame rate. BioeffectsChanging the sector angle may change the TI and/or MI. Observe the output display for possible effects. Angle Steer DescriptionYou can steer the B-Mode, B-Mode Doppler, M-Mode, or B- Mode Color Flow sector angle to get more information without moving the probe. AdjustingTo steer the angle to the left/right, press Scan Area, then move the Trackball to the left/right. Va l u e sVaries, depending on the probe. BenefitsAllows you to move a reduced sector angle laterally, without moving the probe. Beneficial in GYN. And it allows you to vary the angle so the scan is not perpendicular to the direction of the flow. BioeffectsSteering the sector angle may change the TI and/or MI. Observe the output display for possible effects.
Optimizing the Image 5-16 LOGIQ 5 Basic User Manual Direction 2300002-100 Rev. 2 Reverse DescriptionFlips the image 180 degrees left/right. AdjustingTo flip the image 180 degrees, press Rotate. Linear probes do not rotate. Va l u e sThe image rotates in 180 degrees left/right. Rotation settings vary by probe and application. Rotation settings are returned to the factory or user preset value when you change the following: Probe, Exam Category, Exam Calcs, or New Patient. BenefitsUsed for anatomical correctness. Dynamic Range (Compression) DescriptionDynamic Range controls how echo intensities are converted to shades of gray, thereby increasing the adjustable range of contrast. The Dynamic Range control name changes to Compression on frozen images. AdjustingTo increase/decrease, adjust Dynamic Range. Va l u e sThe settings cycle in 3dB steps from 30 dB to 120 dB. The current value displays on the display and on the Touch Panel. Dynamic Range values vary by probe, application, and frequency setting. Dynamic Range levels are returned to the factory or user preset value when you change the following: Probe, Exam Category, Exam Calcs, New Patient, or Multi Frequency. BenefitsDynamic Range is useful for optimizing tissue texture for different anatomy. Dynamic Range should be adjusted so that the highest amplitude edges appear as white while lowest levels (such as blood) are just visible. Affect on other controlsDynamic range operates only in realtime, not in Freeze, CINE, CINE Timeline, or VCR playback and affects Gain. CAUTIONWhen reading a rotated image, be careful to observe the probe orientation to avoid possible confusion over scan direction or left/right image reversal.