Investigations of internal noise levels for different target sizes, contrasts, and noise structures

Minah Han, Shinkook Choi, Jongduk Baek

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

Abstract

To describe internal noise levels for different target sizes, contrasts, and noise structures, Gaussian targets with four different sizes (i.e., standard deviation of 2,4,6 and 8) and three different noise structures(i.e., white, low-pass, and highpass) were generated. The generated noise images were scaled to have standard deviation of 0.15. For each noise type, target contrasts were adjusted to have the same detectability based on NPW, and the detectability of CHO was calculated accordingly. For human observer study, 3 trained observers performed 2AFC detection tasks, and correction rate, Pc, was calculated for each task. By adding proper internal noise level to numerical observer (i.e., NPW and CHO), detectability of human observer was matched with that of numerical observers. Even though target contrasts were adjusted to have the same detectability of NPW observer, detectability of human observer decreases as the target size increases. The internal noise level varies for different target sizes, contrasts, and noise structures, demonstrating different internal noise levels should be considered in numerical observer to predict the detection performance of human observer.

Original languageEnglish
Title of host publicationMedical Imaging 2014
Subtitle of host publicationImage Perception, Observer Performance, and Technology Assessment
PublisherSPIE
ISBN (Print)9780819498304
DOIs
Publication statusPublished - 2014 Jan 1
EventMedical Imaging 2014: Image Perception, Observer Performance, and Technology Assessment - San Diego, CA, United States
Duration: 2014 Feb 162014 Feb 17

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume9037
ISSN (Print)1605-7422

Other

OtherMedical Imaging 2014: Image Perception, Observer Performance, and Technology Assessment
CountryUnited States
CitySan Diego, CA
Period14/2/1614/2/17

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging

Cite this

Han, M., Choi, S., & Baek, J. (2014). Investigations of internal noise levels for different target sizes, contrasts, and noise structures. In Medical Imaging 2014: Image Perception, Observer Performance, and Technology Assessment [903715] (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 9037). SPIE. https://doi.org/10.1117/12.2042969