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The Dental X-ray Machine. Reference Reading Chapter 2: pp. 15 - 17. X-ray Machine. X-rays are produced within the dental x-ray machine The x-ray machine can be divided into 3 study areas Component Parts The x-ray tube X-ray generating apparatus. Component Parts.

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the dental x ray machine

The Dental X-ray Machine

Reference Reading Chapter 2: pp. 15 - 17

x ray machine
X-ray Machine
  • X-rays are produced within the dental x-ray machine
  • The x-ray machine can be divided into 3 study areas
    • Component Parts
    • The x-ray tube
    • X-ray generating apparatus
component parts
Component Parts
  • The Dental x-ray machine consists of 3 visible component parts:
    • The Control Panel
    • The Extension Arm
    • The Tubehead
the control panel
The Control Panel
  • The Control Panel contains:
    • On-off switch and an indicator light
    • The exposure button and an indicator light
    • Control devices to regulate the x-ray beam
      • Time setting
      • kVp setting
      • mA setting
control panels
Control Panels

Older style

Newer Design

the extension arm
The Extension Arm
  • The extension arm suspends the x-ray tubehead and houses the electrical wires that extend from the control panel to the tubehead
  • The extension arm allows for movement and positioning of the tubehead
tubehead
Tubehead
  • The tubehead is a tightly sealed, heavy metal housing that contains the x-ray tube. The x-ray tube produces the dental x-rays
tubehead1
Tubehead
  • The component parts of the tubehead include:
    • Metal housing
    • Insulating oil
    • Tubehead seal
    • X-ray tube
    • Transformer
    • Aluminum disk/filter
    • Lead collimator
    • Position Indicating Device (P.I.D.)
component parts of the tubehead
Component Parts of the Tubehead
  • The Metal Housing, or body, of the tubehead surrounds the x-ray tube and is filled with oil.
  • It protects the x-ray tube and grounds the high voltage components.

Metal Housing

component parts of the tubehead1
Component Parts of the Tubehead
  • Insulating Oil – the oil that surrounds the x-ray tube.
  • It prevents overheating by absorbing the heat created when x-rays are produced
component parts of the tubehead2
Component Parts of the Tubehead
  • Tubehead Seal – the aluminum or leaded glass covering of the tubehead that permits the exit of x-rays from the tubehead.
  • It seals the oil in the tubehead
component parts of the tubehead3
Component Parts of the Tubehead
  • The X-ray tube – the heart of the x-ray generating system.
component parts of the tubehead4
Component Parts of the Tubehead
  • Aluminum Disks – sheets of 0.5 mm aluminum placed in the path of the x-ray beam.
  • This filters out the longer wavelength, non-penetrating x-rays.
  • Text – p. 15, Fig. 2-14
component parts of the tubehead5
Component Parts of the Tubehead
  • Lead Collimator – a lead plate with a central hole that fits directly over the opening of the metal housing where the x-rays exit the tubehead.
  • Restricts the size of the x-ray beam to 2.75 inches at the patient’s face.
component parts of the tubehead6
Component Parts of the Tubehead
  • Position Indicating Device (P.I.D.) – aims and shapes the x-ray beam as it exits the tubehead.
  • Sometimes called the “cone”

Different tubehead lengths

cathode
Cathode
  • Cathode is the negative electrode of the x-ray tube.
  • The purpose of the electrodes is to supply the electrons necessary to generate x-rays.
  • The cathode consists of:
    • Tungsten filament- generates the electrons that produce the x-rays at the tungsten target
    • Molybdenum cup
anode
Anode
  • The anode is the positive electrode within the x-ray tube
  • The purpose of the anode is to convert the electrons into x-ray photons at the tungsten target.
  • The anode consists of:
    • The tungsten target
    • The copper stem
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