Visual detection measurements in ultrasonography

M. F. Insana, T. J. Hall, M. E. Stevenson, M. A. McFadden, G. G. Cox

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The efficiencies for detecting low-contrast circular targets in acoustic speckle fields are measured for human observers. Cone-shaped targets of known contrast were scanned in cross section at 5 MHz to generate B-scan images. Target images were paired with uniform speckle fields and presented to observers who were asked to identify which of the two images contained the target. In these two-alternative forced-choice (2AFC) observer experiments, the image data were specified exactly. Signal-to-noise ratios (SNR) defined the average observer performance. SNR values were computed from the fraction of correct observer responses and compared with the corresponding SNR for the ideal observer to estimate detection efficiencies. The average human-observer detection efficiency is approximately 50% for both positive- and negative-contrast targets. These results using commercial imaging systems are in basic agreement with those obtained previously using simulated images, although the added experimental uncertainty, particularly uncertainty about the exact position of the target, marginally decreased relative performance and increased observer variability.

Original languageEnglish (US)
Title of host publicationProceedings of the IEEE Ultrasonics Symposium
PublisherPubl by IEEE
Number of pages4
ISBN (Print)0780312783
StatePublished - 1993
Externally publishedYes
EventProceedings of the IEEE 1993 Ultrasonics Symposium - Baltimore, MD, USA
Duration: Oct 31 1993Nov 3 1993

Publication series

NameProceedings of the IEEE Ultrasonics Symposium
ISSN (Print)1051-0117


OtherProceedings of the IEEE 1993 Ultrasonics Symposium
CityBaltimore, MD, USA

ASJC Scopus subject areas

  • Acoustics and Ultrasonics


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