Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Role of phase information and eye pursuit in the detection of moving objects in noise

Not Accessible

Your library or personal account may give you access

Abstract

As part of an ongoing study that uses objective image quality measures to optimize medical imaging x-ray fluoroscopy, we investigated two basic features of the detection of moving cylinders that mimic arteries, catheters, and guide wires. First, we compared detection with and without a phase cue consisting of a nearby alternating light and dark square. Depending on object size and velocity, phase cuing improved detection from 1% to 15% and gave an average of 6%, an effect much smaller than the 38% predicted from a Monte Carlo simulation of the ideal observer. Evidently, humans were limited in their ability to incorporate knowledge of the phase cue. Second, we evaluated the effect of eye pursuit of a fixation point that moved with the target. In general, motion at the highest velocity degraded (74%) and enhanced (68%) detection of small and large objects, respectively. With eye pursuit, both effects were substantially reduced in a manner consistent with a reduced retinal velocity. Our data compared favorably with a human observer model that included a spatiotemporal contrast sensitivity response and smooth-pursuit eye movements with a gain of 0.8. These mechanisms of perception are thought to be present in coronary artery x-ray fluoroscopy imaging, where phase information is available from the moving heart and where motion markers are available from x-ray opaque markers incorporated in thin catheters and guide wires.

© 1999 Optical Society of America

Full Article  |  PDF Article
More Like This
Detection of moving objects in pulsed-x-ray fluoroscopy

Ping Xue and David L. Wilson
J. Opt. Soc. Am. A 15(2) 375-388 (1998)

Effect of inherent location uncertainty on detection of stationary targets in noisy image sequences

Ravindra M. Manjeshwar and David L. Wilson
J. Opt. Soc. Am. A 18(1) 78-85 (2001)

Detection improvement in spatially filtered x-ray fluoroscopy image sequences

Kadri N. Jabri and David L. Wilson
J. Opt. Soc. Am. A 16(3) 742-749 (1999)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (8)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (7)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved