Vascular Calculations
7-2 ACUSON Cypress™ Operator’s Manual
Overview of Vascular Measurements
The Cypress system provides a range of vascular measurements and derived
calculations for diagnostic ultrasound. There are two types of vascular calcula-
tions:
îš„ General: Simple general measurements, such as a distance or area, that are
not associated with a particular calculation and are not saved to the Patient
Report. Table 32 lists the general measurements by each mode type.
îš„ Specific: Measurements that are a part of a formulaic calculation. These typ-
ically involve multiple measurements and the calculation of a clinical index
such as Pulsatility Index. These calculations are saved in the Patient Report.
Table 33 on page 7-3 lists the specific calculations by each mode type.
NOTE General measurements are designed to be a quick way to perform
calculations that you do not need to assign to a site for a report.
Specific measurements are assigned to a site and generate a
Report.
Types of General Vascular Measurements
Table 32 shows the general vascular measurements for each mode.
TABLE 32. General Vascular Measurements by Mode
Mode General Measurements
2D
îš„ Distance
îš„ Area
M-Mode
îš„ Distance
îš„ Time
Spectral Doppler
îš„ Velocity
îš„ PI: PS (Peak Systolic), ED (End Diastolic), S/D
(Systolic/Diastolic), PI (Pulsatility Index), RI
(Resistance Index), TAVmax (Time-Averaged
Maximum Velocity)
îš„ RI: PS (Peak Systolic), ED (End Diastolic), S/D
(Systolic/Diastolic), RI (Resistance Index)
îš„ Acceleration: Vel (Velocity), Time
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