What is the line voltage compensator?
The Line Voltage Compensator compensates or adjusts variations in voltage coming from power company. What is the autotransformer on the low voltage side of the main x-ray circuit do? the autotransformer selects kV. Describe the autotransformer on the low voltage side of the main x-ray circuit and how it operates.
Why is line voltage compensation necessary in x-rays?
Line Voltage Compensation: Most x-ray machines operate on a 220 Volt power source, but power companies cannot supply a perfect supply of 220 Volt power continuously throughout the day. 117 Power consumption in the clinic/hospital is not uniform, resulting in variations in incoming power supplied to the x-ray machine.
Where is the line voltage compensator?
Physic2 x-ray ciruit
| Question | Answer |
|---|---|
| Where is the line voltage compensator located | on the primary side of the autotransformer |
| What does the line voltage compensator do | It adjust the voltage(as there are are variations in line voltage sometimes) so that a consistent level of voltage is always supplied to the autotransformer |
What does kV do in radiography?
This is the highest voltage (measured in thousands of volts) that will be produced by the x-ray machine during an exposure. For example, if 60 kVp is selected, 60 kilovolts (60,000 volts) is the maximum strength of x-rays produced in this exposure.
What is cathode in xray tube?
The cathode is part of an x-ray tube and serves to expel the electrons from the circuit and focus them in a beam on the focal spot of the anode. It is a controlled source of electrons for the generation of x-ray beams.
What is the purpose of line compensation?
The purpose of series compensation is to cancel part of the series inductive reactance of the line using series capacitors. This helps in (i) increase of maximum power transfer (ii) reduction in power angle for a given amount of power transfer (iii) increased loading.
Why do we use high kV technique in CXR?
A high kilovoltage technique enhances the visibility of the lungs by reducing the contrast of the bony thorax and also has the advantage of better penetration of the mediastinum (4,6). For proper visualization of the mediastinum an additional penetrated film is often required (Fig. 3.1).
What is heel effect in radiology?
The anode heel effect in radiography is a well-described physical phenomenon,1,2 whereby radiation intensity varies along the anodeecathode axis of the X-ray tube, decreasing towards the anode. Photons emitted towards the tube’s anode side are attenu- ated more than those emitted towards the cathode.
How does kV affect image quality?
As milliampere seconds increase, perceptual image quality increases gradually from 0.4 mAs to 4 mAs, after which perceptual image quality begins to deteriorate. When kilovoltage increases to within the range of 40 kV to 55 kV, perceptual image quality increases; image quality remains stable after 55 kV.
Why do we need shunt compensation?
Shunt compensation is applied by using shunt capacitors and shunt reactors that are permanently connected to the network or switched on and off according to operating conditions. Shunt capacitors help increase the system load ability and reduce the voltage drop in the line by improving the power factor.
What is the kV for chest xray?
High kilovoltage radiography had its beginning with super-voltage technique and is presently accomplished with the 350 KV chest x-ray system.
What is high kV technique in radiography?
Contrast control Hence the high kV technique of the chest x-ray is employed to present a more uniformly dense image to better appreciate the lung markings. A 15% increase in kV will essentially correlate to an increase in density similar to double the mAs 2.
What are cathodes and anodes?
The Anode is the negative or reducing electrode that releases electrons to the external circuit and oxidizes during and electrochemical reaction. The Cathode is the positive or oxidizing electrode that acquires electrons from the external circuit and is reduced during the electrochemical reaction.
Which device is used in compensation technique?
Solution: Compensation techniques refer to the use of temperature sensitive devices such as thermistors, diodes, transistors, sensistors etc to compensate variation in currents.
What is meant by line compensation?
Line Compensation – Ideal voltage profile for a transmission line is flat, which can only be achieved by loading the line with its surge impedance loading while this may not be achievable, the characteristics of the line can be modified by line compensators so that. Ferranti effect is minimized.
What is difference between series and shunt compensation?
The shunt capacitor does it by changing the power factor of the load, whereas the series capacitor does it by directly offsetting the inductive reactance of the circuit to which it is applied.
What is keV xray?
Kilovoltage peak (kVp) is the peak potential applied to the x-ray tube, which accelerates electrons from the cathode to the anode in radiography or computed tomography. Tube voltage, in turn, determines the quantity and quality of the photons generated.