5.2.3.2 NDAEB Describe Factors That Affect The
Quantity And Quality Of The X Ray Beam: Q’s And A’s
Wavelength Right Ans - X ray with shorter wavelengths have more
penetrating power, whereas those with longer wavelengths are less
penetrating and more likely to be absorbed by matter.
X ray beam quality Right Ans - used to describe the mean energy or
penetrating ability of the x ray beam.
Factors that affect quality of x ray beam Right Ans - voltage
kilovoltage peak ( kvp )
density
contrast exposure time
Voltage Right Ans - measurement of electrical force that causes electrons to
move from the negative cathode to the positive anode.
how voltage affects x ray beam Right Ans - voltage determines the speed of
electrons that travel from cathode to anode.
When the speed of the electrons is increased , the electrons strike the target
with greater force & energy, resulting in a penetrating x ray beam with short
wavelength.
voltage is measured in Right Ans - volts (v)or kilovolts (kV)
Volt (v ) Right Ans - is the unit of measurement used to describe the
potential that drives an electrical current through a circuit. Dental x ray
equipment requires the use of high voltages.
1kV = Right Ans - 1000 volts
Kilovoltage Right Ans - can be adjusted according to the individual
diagnostic needs of the patients.
A higher kV should be used when the area to be examined is dense or thick.
85-100 kV Right Ans - produces more penetrating dental x rays with
greater energy and shorter wavelength
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