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17 - 96
17.7.1 Factors Affecting Flow Rates
An injector's ability to generate pressure is only one factor affecting maximum flow rates. Other factors include:
Catheter diameter
Viscosity (thickness) of the fluid
Tube length
Number of tubing sections
Tube diameter
Temperature of the fluid, tube, and syringes during the injection
Maximum pressure setting on the injector
If problems are experienced achieving the desired flow rate, please contact a Clinical representative for suggestions
that may increase it.
17.7.2 Maximum Flow Rate Performance
Maximum flow rates were achieved using the following catheters, with inner diameters (ID) and lengths as noted.
Contrast was heated to 37° C ± 1° C. System programmable pressure limit of 325 psi (2241 kPa) was used for
testing.
NOTE: Individual results may vary. Maximum flow rate performance results were met using the
components and conditions described in this section. Different components and/or conditions
may lead to different results.
Table 17 - 2: Steady State Maximum Flow Rate Using 60-inch LPCT from Bayer
18 Gauge
Fluid
ID: 0.876 mm – 0.978 mm
Length: 2.95 cm (1.16 in.)
Ultravist 300
8.5 mL/s
Ultravist 370
8.5 mL/s
0.9% Saline
8.5 mL/s
17.7.3 Programmable Pressure System Performance
Table 17 - 3: Programmable Pressure System Performance
Programmed Pressure
Limit
325 psi (2241 kPa)
300 psi (2068 kPa)
250 psi (1724 kPa)
225 psi (1551 kPa)
200 psi (1379 kPa)
150 psi (1034 kPa)
100 psi (689 kPa)
MEDRAD® Stellant FLEX CT Injection System with Certegra® Workstation
Catheter
20 Gauge
ID: 0.800 mm
Length: 2.54 cm (1.00 in.)
7.0 mL/s
7.0 mL/s
7.0 mL/s
High Pressure Disarm
375 psi (2586 kPa)
350 psi (2413 kPa)
300 psi (2068 kPa)
275 psi (1896 kPa)
250 psi (1724 kPa)
200 psi (1379 kPa)
150 psi (1034 kPa)
22 Gauge
24 Gauge
ID: 0.546 mm – 0.648 mm
ID: 0.445 mm – 0.521 mm
Length: 2.54 cm (1.00 in.)
Length: 1.91 cm (0.75 in.)
6.0 mL/s
4.0 mL/s
5.0 mL/s
3.0 mL/s
6.0 mL/s
4.0 mL/s
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