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28 July, 04:28

Select the three factors from the choices below that determine the size of the actual focal spot on the target anode.

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  1. 28 July, 07:03
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    Answer: A focal spot in the x-ray setup is the area of the anode surface which receives the beam of electrons from the cathode. It is the apparent source of x-rays.

    Below are some of the factors that affect its size.

    Explanation:

    Size of the focal spot depends on

    * angle of the anode

    Other prime factors that affect x-ray emission; under the control of the radiographer includes;

    • Miliamperage-second (mAs) (tube current measurement)

    • Kilovoltage (kVp) Controls both the quantity and quality of the x-ray beam with the speed and energy.

    • Distance (d) - Related to tube design and construction.

    • Tube housing

    • Target material

    • Filtration

    • Voltage waveform
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