GE AMX-4+ Technical Publications page 33

GE MEDICAL SYSTEMS

REV 10

Important:

Note:

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Should you reach a maximum or minimum value, kVp / mAs MAX or kVp /

mAs MIN will briefly appear on the message display to alert you.

Carefully check the digital display (see Illustration 5−9) before making

an exposure to ensure that the factors selected are those that are in-

tended. Pay particular attention to the placement of the decimal point in

the mAs setting to ensure that whole numbers are not mistaken for an in-

tended mAs fractional number.

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The kVp ranges from 50 to 125 kVp, in 24 steps:

50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 80, 85, 90, 95, 100, 105, 110,

115, 120 and 125.

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The mAs ranges from 0.40 to 320 mAs, in 30 steps:

0.4, 0.5, 0.64, 0.8, 1, 1.25, 1.6, 2, 2.5, 3.2, 4, 5, 6.40, 8, 10, 12.5, 16, 20, 25, 32,

40, 50, 64, 80, 100, 125, 160, 200, 250 and 320. Refer to the chart below for

maximum technique ratings.

Maximum kVp and mAs Ratings

kVp

110 to 125

95 to 105

50 to 90

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It's important to note that the kVp setting takes precedence over your mAs set-

ting. That is, if your technique would generate too much heat for the x−ray

tube anode, the mAs setting will automatically decrease to permit the se-

lected kVp.

For instance, if kVp is set at 110 then your maximum mAs will not exceed 200.

The maximum allowable kVp and mAs ratings stated within this operation

manual and as allowed by the equipment, may appear to exceed the tube rat-

ings. (Reference Direction 46−017226, Tube Ratings HRT X−ray Tube 50 &

60 Hz or 2236721−100, Product Data Sheet Maxiray 75 TH 11 X−ray Tube).

The reason for this apparent discrepancy is that the tube rating charts in

Direction 46−017226 or Product Data Sheet 2236721−100 are based upon a

25% heated tube assembly (75% heat units remaining), while the actual maxi-

mum allowable kVp and mAs ratings are based upon a cold tube assembly.

The AMX−4+ generator contains a proprietary heat loading algorithm

which protects the tube assembly for all heat loading conditions.

5−9

(MODEL 2169360, 2236420 & 2275938 SERIES)

mAs

200

250

320

AMX−4+ OPERATION

om 2166913−100