GE Logiq P5 User Manual
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LOGIQ 5 Basic User Manual 7-1 Direction 2300002-100 Rev. 2 Chapter 7 General Measurements and Calculations Describes how to perform general measurements and calculations.
General Measurements and Calculations 7-2 LOGIQ 5 Basic User Manual Direction 2300002-100 Rev. 2 Introduction Measurements and calculations derived from ultrasound images are intended to supplement other clinical procedures available to the attending physician. The accuracy of measurements is not only determined by system accuracy, but also by the use of proper medical protocols by the user. When appropriate, be sure to note any protocols associated with a particular measurement or calculation. Formulas and databases used within the system software that are associated with specific investigators are so noted. Be sure to refer to the original article describing the investigators recommended clinical procedures. Overview This section provides information about taking measurements and describes calculations available in each mode. It includes the following topics: • Exam workflow • Location of measurement controls • Description of calipers • List of generic measurements • General information about taking measurements • Mode Measurements: Step-by-step instructions for taking specific measurements, organized by mode • Basic steps to view and edit worksheets
Introduction LOGIQ 5 Basic User Manual 7-3 Direction 2300002-100 Rev. 2 Exam workflow For each patient, the system organizes information by exam category, study, and measurement. The definitions of these terms are as follows: • Exam Category – the highest level of an ultrasound exam. Categories include the following: • Abdomen • Obstetrics • Gynecology • Cardiology • Vascular • Urology • Small Parts • Pediatrics • Study – a logical grouping of measurements. After you choose an exam category, the system allows you to select a study. For example, when you choose the Obstetrics exam category, you can choose one of the following studies: • Generic • OB-1 • OB-2/3 • OB-General • Fetal Heart • OB/GYN Vessel • Measurement – the measurements and calculations needed to analyze an item of anatomy. For example, a femur length is a measurement. A measurement can include several pieces of measurement data. For example, to calculate the area of a gestational sac, you need to measure width, length, and depth.
General Measurements and Calculations
7-4 LOGIQ 5 Basic User Manual
Direction 2300002-100 Rev. 2
Exam workflow (continued)
The following shows a workflow example for an obstetrics exam.
For details on how to start a new patient, See ‘Beginning a New
Patient’ for more information.
NEW PATIENT
(Exam Category)
Abdomen OBSTETRICSGynecology Cardiology Pediatrics
(Study)
Generic OB-1OB-2/3 OB-General Fetal Heart
(Measurement)
GSCRL BPD FL
Introduction LOGIQ 5 Basic User Manual 7-5 Direction 2300002-100 Rev. 2 Location of Measurement Controls Figure 7-1. Locating Measurement Controls 1. Measure. Activates a measurement caliper and the associated calculation package. 2. Set. Fixes the caliper for measurements and completes the measurement sequence. 3. Clear. During a measurement sequence, erases the measuring caliper and measurement data from the display. When not performing a measurement sequence, clears all calipers and measurements from the display. 4. Ellipse. After the first caliper for a distance measurement has been set and the second caliper positioned, activates the area/ellipse measurement function. During the ellipse adjustment, use to increase or decrease the size of the ellipse. 5. Trackball. Moves the measurement calipers, selects the measurement on the Summary Window, or selects items on the Touch Panel. Zoom Scan Area Set M/D Cursor Clear Comment Ellipse Body PatternMeasure 1 5 4 3 2
General Measurements and Calculations 7-6 LOGIQ 5 Basic User Manual Direction 2300002-100 Rev. 2 Description of calipers While you are making a measurement, the measurement caliper is either active (open plus sign) or fixed (closed plus sign). An active caliper is yellow and a fixed caliper is green. The system allows you to identify measurements by number or by unique symbol. If you choose Number as the Cursor Type, after you complete a measurement, it is assigned a number. If you choose Symbol as the Cursor Type, after you complete a measurement, the caliper symbol changes to one of the nine shown below. The symbols are used in sequence as listed. The first symbol is used for the first measurement, the second symbol for the second measurement, and so on. The numbers or symbols also identify measurements in the Results Window. Figure 7-2. Fixed Caliper Symbols For information about how to choose Cursor Type of Number or Symbol, see Table 16-11. Measurement line display While you are making a measurement, the system displays a dotted line to show the measurement. After you press Set to complete the measurement, if Cursor Line Display is On, the dotted line remains on the display. If Cursor Line Display is Off, the system erases the dotted line after you press Set and only the measurement calipers with a number or symbol are displayed. For information about how to turn Cursor Line Display On or Off, see Table 16-11.
Introduction LOGIQ 5 Basic User Manual 7-7 Direction 2300002-100 Rev. 2 List of general measurements The following table shows the types of general measurements available when you press Measure but do not choose a specific calculation. The type of measurement depends on the current scan mode and the number of times Measure is pressed. NOTE: The type of measurement repeats as you press Measure. For example, in M–Mode, when you press Measure the fourth time, the Tissue depth measurement is available, and so on. Table 7-1: General Measurements by Mode If you press Measure (while frozen)MODE B and CF DopplerM Once • Distance • Circumference and area (ellipse)Velocity Tissue depth Twice Circumference and area (trace)TAMAX, TAMIN, and TA M E A NTim e interval Three times Two velocities, slope, and time intervalDepth difference, slope, and time interval Four times Time interval
General Measurements and Calculations 7-8 LOGIQ 5 Basic User Manual Direction 2300002-100 Rev. 2 General Instructions You can take measurements in all modes and image formats, including real-time, frozen, CINE, or VCR playback. After you select an exam category, the available calculations are displayed on the Touch Panel. Measurement and calculation results As you take measurements, each measurement is given a sequential number on the display and in the Results Window. The system can display nine measurements on the screen at one time. While you are taking a measurement, the value in the Results Window updates until you complete the measurement. Once the Results Window has nine measurements, if you make any further measurements, the system erases the first measurement and adds the new measurement (first in, first out). Selecting a calculation When you take measurements, you can select the calculation before you take the measurement or after you take it. For example, in Obstetrics, if you select the calculation before you take the measurement, the estimated fetal age is displayed as you take the measurement. If you select the calculation after you take the measurement, the estimated fetal age is displayed after you complete the measurement. NOTE: After you take a measurement, if you select a calculation and the measurement is not applicable for the calculation, then the system assumes you want to start the calculation. The system then uses the calculation for the next measurement.
Introduction LOGIQ 5 Basic User Manual 7-9 Direction 2300002-100 Rev. 2 Selecting a calculation (continued) If there is a measurement listed in the Results Window that has not been assigned a calculation, to assign the measurement: 1. Press Measure. 2. To select the measurement in the Results Window, move the Trackball to the measurement. The measurement is highlighted. 3. Press Set. The system displays a list of applicable calculations. For example, if it is a distance measurement, the list includes all distance calculations for the current study. 4. To select an item in the list, move the Trackball to highlight the item and press Set. The system assigns the calculation to the measurement. Selecting a measurement in a different category While scanning a patient, you may find that you want to measure an item that is not in the current exam category. To select a calculation from a different exam category: 1. To display studies for the current category, press Measure. 2. On the Touch Panel, select Exam Calcs. 3. On the Touch Panel, select Exam Category. The system lists exam categories. 4. Select the category that has the calculation you want to make. The system displays the Touch Panel for the selected exam category. 5. Select the study and the desired measurement. 6. After you complete the measurement, to return to the original exam category, repeat steps 1–4. NOTE: The measure WILL NOT appear on the original exam category.
General Measurements and Calculations 7-10 LOGIQ 5 Basic User Manual Direction 2300002-100 Rev. 2 Specifying measurement and display options The Options tab allows you to specify the following measurement and display options: • Whether to display the Results Window and Summary Window • The cursor size • The number of heart rate cycles to use to calculate heart rate • Where to position the Results Window on the monitor display • Choose whether the Doppler waveform is automatically or manually traced. Figure 7-3. Measurement and Display Options