Attentional perceptual thresholds for manipulated digitized mammograms

Anthony Maeder, Clinton Fookes

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


This paper describes a series of experiments to investigate influence of perceptual response in skilled observers, due to subtle pixel intensity transforms in radiological images. Contrast and edge enhancement operations were applied to digitized mammograms. in order to determine thresholds at which variations in attentional behaviour not consciously identified by the observer were detected, during normal visual scanning procedures in a typical screening viewing situation. Continuous tracking of eye movements was undertaken to obtain patterns of fixation sequences and durations for three different observers, and both qualitative and quantitative analyses were applied to this data. Consistent thresholds at which attentional perturbation occurred were established based on levels of aggregated pixel errors determined by SNR values, across the different methods of image manipulation considered.

Original languageEnglish
Article number11
Pages (from-to)100-109
Number of pages10
JournalProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Issue number26
Publication statusPublished - 4 May 2004
Externally publishedYes
EventMedical Imaging 2004 - Image Perception, Observer Performance, and Technology Assessment - San Diego, CA, United States
Duration: 17 Feb 200419 Feb 2004


  • Attention
  • Eye movement
  • Fixation
  • Image enhancement
  • Mammogram
  • Screening


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