Presentation on theme: "Reference Reading Chapter 2: pp. 15 - 17. X-rays are produced within the dental x-ray machine The x-ray machine can be divided into 3 study areas."— Presentation transcript:
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
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
The tubehead is a tightly sealed, heavy metal housing that contains the x-ray tube. The x-ray tube produces the dental x- rays
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.)
Metal Housing 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.
Insulating Oil – the oil that surrounds the x- ray tube. It prevents overheating by absorbing the heat created when x-rays are produced
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
The X-ray tube – the heart of the x-ray generating system.
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
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.
Different tubehead lengths Position Indicating Device (P.I.D.) – aims and shapes the x-ray beam as it exits the tubehead. Sometimes called the “cone”
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
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