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Factor One, High Frequency vs. Single Phase
Output:
HF doubles effective power.
35mA High Frequency equals the same
effective power as 70mA with a single phase unit. High Frequency
produces twice as much MR output compared to single phase, effectively
doubling the mA. A 300mA single phase unit produces the same MR output
as a 150mA High Frequency unit.
Factor Two, 30” vs. 40” FFD:
FED doubles effective power.
150mA at 40” FFD will produce the same
effective power onto the film as 75mA will produce at a 30” FFD. The
shorter the film focal distance (FFD) the greater the amount of MR
entering the patient. A 30” FFD compared to a 40” FFD will produce twice
the MR entering the patient.
Fac tor
Three, 6:1 vs. 10:1 Grid Ratio:
Grid ratio doubles effective power.
150mA exposure with a 6:1 ratio grid
produces the same effective power at the film as a 300mA exposure using
a 10:1 ratio grid. The lower the grid ratio the less penetrating power
or mA is required to operate the grid. A 6:1 ratio grid requires 1/2 the
exposure to penetrate compared to a 10:1 ratio grid. Grid ratios are
selected and determined by the maximum kVp used. A 100kVp unit can use a
6:1 ratio grid and a 125kVp unit uses a 8:1, or 10:1 ratio grid.
Versa-View™ HF Mobile 100kVp/35mA or 60mA System
Operating at a 30” FFD with a 6:1 ratio grid at 35mA or
60mA maximum, this unit produces approximately the same single phase MR
output power when compared to using a Stationary Single Phase unit with
a 10:1 ratio grid and 40” FFD. 10035 HF
Unit 100kVp/35mA High Frequency
unit requires 120vAc, 20 Amps of input power. The
10060HF Unit, 100kVp/60mA
High frequency unit requires 220VAC,
20amp of input power.
Single Phase Stationary Radiographic Unit
Operating at a 40” FFD with a 10:1 ratio grid, this unit
produces comparable MR at the film as a self contained mobile High
Frequency system with a 6:1 ratio grid and 30” FFD.
A
300mA/125kVp stationary unit requires
208 VAC, 75 Amps input power.
Factors one, two, and three each will double the
effective power of a portable, high frequency, self contained mobile
x-ray system. 35mA x 2 =70mA, 70mA x 2 = 140mA, 140mA x 2 = 280mA
of single phase output power .
Calculations are an estimate for comparative purposes. Actual
results may vary.
| 1-800-346-9729 |
www.vetxray.com |
Sales@vetxray.com |
Diagnostic Imaging Systems,
Inc.
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