Tube arcing

A.Prof Frank Gaillard et al.

Tube arcing occurs when there is a short-circuit within the tube, typically from the cathode to the tube envelope. The result is a temporary loss of x-ray output and a localized artefact. 

A number of causes of tube arcing are recognized 1

  1. insulator surface flashover
  2. insulator breakdown
  3. vacuum flashover
    • most common
    • due to particulate impurities or gas within the tube
    • new tubes are more prone to this problem due to residual gas

A small amount of tube arching is not uncommon and modern scanners have automated processes to remove the artefact from the final images 1,2

Physics and imaging technology: CT
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Article information

rID: 2220
Section: Physics
Tag: ct
Synonyms or Alternate Spellings:

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