76 Chapter 4: Measurements and Calculations
Meas. & Calcs
Volume Flow Calculation
The following table shows the transducers and exam types that provide a volume flow calculation.
The following table shows the measurements required to complete the volume flow calculation.
Volume flow measurements are done in 2D and Doppler. Both measurements are required for the
volume flow calculation. The Doppler sample volume should completely insonate the vessel.
Note: The following factors should be considered when acquiring volume flow measurements:
• Users should follow current medical practice for volume flow calculation applications.
• The accuracy of the volume flow calculation is largely dependent on the user.
• The factors identified in the literature that affect the accuracy are:
• Using the diameter method for 2D area
• Difficulty ensuring uniform insonation of the vessel—The TITAN system is limited to the sample
volume sizes listed in Table 4.
• Precision in placing the caliper
• Accuracy in angle correction
The considerations and degree of accuracy for volume flow measurements and calculations are
discussed in the following reference:
Allan, Paul L. et al. Clinical Doppler Ultrasound, 4th Edition, Harcourt Publishers Limited. 2000,
pp. 36-38.
Warning: Verify the patient information, date, and time settings are accurate.
Before starting a new calculation, start a new patient exam to delete the previous
measurements. See “New Patient” on page 41.
Table 4: Transducers and Exam Types for Volume Flow
Transducer Exam Types Gate Sizes (mm)
C60 Abdomen 2, 3, 5, 8, 10, 12
L38/HST Vascular 1, 3, 5, 7, 10, 12
Table 5: Volume Flow Calculation
Measurement Calculation Result
D (2D distance)
TAM (Doppler auto trace)
VF (Volume Flow)
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