A preliminary investigation: The impact of microscopic condenser on depth of field in cytogenetic imaging

Liqiang Ren, Yuchen Qiu, Zheng Li, Yuhua Li, Bin Zheng, Shibo Li, Wei R. Chen, Hong Liu

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


As one of the important components of optical microscopes, the condenser has a considerable impact on system performance, especially on the depth of field (DOF). DOF is a critical technical feature in cytogenetic imaging that may affect the efficiency and accuracy of clinical diagnosis. The purpose of this study is to investigate the influence of microscopic condenser on DOF using a prototype of transmitted optical microscope, based on objective and subjective evaluations. After the description of the relationship between condenser and objective lens and the theoretical analysis of the condenser impact on system numerical aperture and DOF, a standard resolution pattern and several cytogenetic samples are adopted to assess the condenser impact on DOF, respectively. The experimental results of these objective and subjective evaluations are in agreement with the theoretical analysis and show that, under the specific intermediate range of condenser numerical aperture ( NAcond ), the DOF value decreases with the increase of NAcond . Although the above qualitative results are obtained under the experimental conditions with a specific prototype system, the methods presented in this preliminary investigation could offer useful guidelines for optimizing operational parameters in cytogenetic imaging.

Original languageEnglish (US)
Title of host publicationDynamics and Fluctuations in Biomedical Photonics IX
StatePublished - 2013
Externally publishedYes
EventDynamics and Fluctuations in Biomedical Photonics VIII Conference - San Francisco, CA, United States
Duration: Feb 2 2013Feb 4 2013

Publication series

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


ConferenceDynamics and Fluctuations in Biomedical Photonics VIII Conference
Country/TerritoryUnited States
CitySan Francisco, CA


  • Condenser
  • Cytogenetic imaging
  • Depth of field (DOF)

ASJC Scopus subject areas

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


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