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Essentials of Radiographic Physics and Imaging 3rd Edition By James Johnston; Terri L. Fauber $17.99   Add to cart

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Essentials of Radiographic Physics and Imaging 3rd Edition By James Johnston; Terri L. Fauber

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Essentials of Radiographic Physics and Imaging 3rd Edition By James Johnston; Terri L. Fauber

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  • September 13, 2024
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  • 2024/2025
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Test Bank For Essentials of Radiographic Physics and Imaging
3rd Edition By James Johnston; Terri L. Fauber
Which of the following is designed to withstand tremendous heat and maintain a
vacuum? - ANSWER: Glass (or metal) envelope.

By angling a rotating anode target we hope to achieve which of the following? -
ANSWER: A sharper image and large area for heating.

The most common target angle for conventional x-ray tubes is - ANSWER: 12 degrees

What part of the induction motor is outside the glass envelope? - ANSWER: Stator.

What is the radiographer responsible for? - ANSWER: safe operation and proper
maintenance

What is the housing consist of? - ANSWER: -lead lined structure
-prevents against leakage
-only part we can touch
-oil bath
-cooling only (no lubrication)
-cooling fans
-electrical insulation
-large cables
-absorbs stray photons

What is the general purpose x-ray tube is an electronic _______ tube - ANSWER:
vacuum

What does the x-ray tube consist of? - ANSWER: -anode
-cathode
-induction motor
-encased in a glass or metal enclosure

What is the main purpose of the enclosure? - ANSWER: to maintain a vacuum within
the tube to prevent electrical arching

Glass tube variety - ANSWER: generally made of borosilicate glass because it is heat
resistant

used in: CT & Fluoro

disadvantage: can still get arching & break glass
-causes vaporized tungston to group together

, Metal envelope variety - ANSWER: provides a constant electric potential between
the electron stream from the cathode and the enclosure, thereby avoiding the
arching problem and extending tube life

used in: x-ray

Anode - ANSWER: positive end of the x-ray tube

What does the anode serve as? - ANSWER: an electrical and thermal conductor

What is the source of radiation? - ANSWER: the focal spot in the anode

Stationary anode - ANSWER: -old
-only used for mammo & dentistry

-a tungsten button embedded in a copper rod

-disadvantage: the rapidly building heat can damage tube
-hits same spot over & over causing pitting
-electrons stay in pit instead of going to target

Rotating anode - ANSWER: -a rotating tungsten-coated molybdenum dis mounted on
a copper shaft with a molybdenum core

-advantage: spread heat produced during the x-ray production over a larger surface
area
-dissipates heat

In a rotating anode where does the electron stream hit? - ANSWER: the focal tract
-larger surface area

Anode Materials: Copper - ANSWER: used as part of the shaft because it has
excellent thermal and electrical conductive properties

Anode Materials: Molybdenum - ANSWER: used as the disc base and core because it
has low thermal conductivity and it is a light but strong alloy

Tungsten - ANSWER: used because it has a very high melting point and a high atomic
number (74), improving the efficiency of the x-ray

Rhenium - ANSWER: may be added to the tungsten to increase thermal capacity and
tensile strength

How is the anode rotated? - ANSWER: by an induction motor

What are the two major parts of the anode motor? - ANSWER: -stator (outside)
-rotor (inside)

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