The dental x ray machine
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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

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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 component parts of the dental x ray machine

The Component Parts of the Dental X-ray Machine


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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