Week 2b Chapter 08 The Console and high voltage section 73

Week 2b Chapter 08 The Console and high voltage section 73...

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Chapter 8 The Console The Console is the part of the machine that the operator controls the operation of the x-ray machine. All machine console are a little different but there are always similarities. The console is where we control x-ray tube current and voltage.
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The Console Controls The console will have controls for: mA and time or mAs kVp Focal Spot Line Voltage Compensation Automatic Exposure Control
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Symbols Used to Draw Circuits We will be using the symbols to define the circuits in the x-ray machine
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Console Circuits
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Line Compensation At the bottom left is the controls for line voltage compensation. Most machine are designed to operate at 220 volts while some will work with 110 volts or 440 volts
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Line Compensation The power company often cannot provide exactly 220 volts at all times. Elevators and Air Conditioners may reduce the voltage available for the x-ray unit.
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Line Compensation Older machine have a meter to monitor the line voltage attached to the autotransformer. The operator can adjust the taps on the transformer to account for low or high incoming voltage.
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Line Compensation More modern units automatically adjusts for the incoming power so a meter is not provided. Often over looked by the operator. Results in improper exposure.
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Autotransformer The autotransformer is designed to supply voltage of varying magnitude to several different circuits of the x-ray machine including both the filament circuit and high voltage circuits.
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Autotransformer The autotransformer has only one winding and one core. The single winding has a number of connection or electric taps.
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kVp Adjustment Most consoles will have one or two knobs that change the taps on the autotransformer for major and minor kVp. Modern units have a LED readout of kVp.
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kVp Adjustment Setting the desired kVp will determine the voltage applied to the step-up transformer in the high voltage section of the machine.
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kVp Adjustment If a meter is provided, it is placed across the output terminals of the autotransformer and therefore it reads voltage and not kVp. The scale will read in kVp.
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mA Control The tube current, the number of electrons crossing from the cathode to anode per second is measured in milliapmeres (mA). The quantity of electrons is determined by filament temperature.
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mA Control The filament normally operates at currents between 3 and 6 A. The Tube Current is controlled through a separate circuit called the filament circuit
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mA Control Voltage is provided by taps of the autotransformer. This voltage is reduced with precise resisters to a value corresponding to the mA stations available.
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Tube current is usually not continuously variable, usually only currents of 50, 100, 150, 200 & 300 mA and higher are provided. Newer units are
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Week 2b Chapter 08 The Console and high voltage section 73...

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