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Breast Cancer Research

, 2:A64 | Cite as

Investigation into possible causes of blurring in mammograms

  • D Seddon
  • KA Schofield
  • CA Waite
Meeting abstract

Keywords

Cancer Research Rhodium Full Text Compression Force Longe Exposure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Full text

Technical recalls cause unnecessary anxiety to the women concerned and an increased workload for the screening unit. A review of technical recalls at Bolton Breast Unit found that over 90% were due to blurred images. This study aimed to identify causes of blurring and to reduce the number of technically inadequate films. X-rays were taken using static IGE DMR & 800T units and Kodak Min-R 2000 film/screen combination. Exposure factors (kVp, mAs, target & filter) were selected automatically, using 'Standard' mode. Two groups of films were examined; group 1 (n = 45) were identified as blurred at reporting stage and group 2 (n = 45) were technically adequate films selected randomly.

Analysis showed that the mean compression force applied was 10 dN and 13 dN for the blurred and adequate films, respectively, which is a significant difference (P < 0.01). The breast thickness and mAs were significantly higher in the blurred group (P < 0.01). With the 800T unit, the rhodium filter was selected for 90% of blurred films compared to 36% of adequate films. Inadequate compression in the blurred group (which would result in greater breast thickness, longer exposures and earlier selection of rhodium target/filter) is suspected. A minimum compression force has been recommended at the unit.

Copyright information

© Current Science Ltd 2000

Authors and Affiliations

  • D Seddon
    • 1
  • KA Schofield
    • 1
  • CA Waite
    • 1
  1. 1.Bolton Breast UnitRoyal Bolton HospitalBoltonUK

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