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Issue #371 resolved

Mammo tube current recorded incorrectly

Ed McDonagh
created an issue

Mam.py incorrectly puts the XrayTubeCurrent into the average_x-ray_tube_current field, and doesn't populate the x-ray_tube_current field in the tube current table.

Rdrs.py does populate the fields correctly.

Therefore when display and export look to the average field, the RDSR imported mammo doesn't have any content.

Comments (11)

  1. Ed McDonagh reporter

    The tube current in a GE mammo image, when multiplied with the exposure time, does not add up to the 'Exposure' or the 'Exposure in μAs'. This might suggest that the 'pre-exposure' is included in the Exposure values but the mA and time only refer to the main exposure?

  2. Ed McDonagh reporter

    The same is true for Hologic 2D AEC exposures. So I think we know about one tube current event within an exposure, but we don't know the average tube current for the exposure as we've no record of the relative contributions of time and current to the difference in recorded mAs.

    Propose:

    • put the tube current recorded in the RDSR into the tube current field, then for mammo only populate the average tube current field, if it isn't populated, by the average of the tube currents for that exposure. Which for all systems I've seen so far, would be the single value entered. The existing display and export of average mA would continue to work.
    • Start populating the xray_tube_current field in addition to the average for mammo images.
  3. Ed McDonagh reporter

    Changed the pulse_width, kVp, tube_current and X-ray filters recording so that multiple values can be recorded, as had been intended. Previously only the final value in any irradiation event would be recorded. Also changed all but first if to elif to reduce computation time. Refs #371

    → <<cset d0ebec1ee935>>

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