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Evaluation of camera requirements for comparative genomic hybridization
M Tirkkonen1, R Karhu, O Kallioniemi
1Laboratory of Cancer Genetics, University of Tampere, Finland.
Cytometry
|December 1, 1996
Summary
Minimal camera requirements for comparative genomic hybridization (CGH) are not stringent. Lower resolution cameras, even inexpensive video-rated ones, are sufficient for accurate CGH analysis and interpretation of genetic changes.
Area of Science:
- Genetics
- Molecular Biology
- Imaging Technology
Background:
- Comparative genomic hybridization (CGH) relies on digital image analysis of fluorescence intensities from metaphase chromosomes.
- High-quality CCD cameras are typically used for CGH image acquisition, but their minimal requirements remain undefined.
Purpose of the Study:
- To determine the minimal spatial and dynamic resolution requirements for CCD cameras used in CGH.
- To assess the impact of reduced image resolution on CGH profile accuracy and interpretation.
Main Methods:
- Artificially reduced the spatial and dynamic resolution of images from a scientific-grade CCD camera (Xillix MicroImager).
- Compared CGH profiles from reduced-resolution images to original images.
- Performed a practical test comparing a scientific-grade camera with two 8-bit video-rated CCD cameras (Cohu 4910, Photometrics ImagePoint) in a real CGH setting.
Main Results:
- Reducing dynamic resolution from 12-bit (4,096 gray levels) to 8-bit (256 gray levels) had negligible effect on CGH profiles and interpretation.
- Reducing spatial resolution (pixel count) resulted in virtually identical CGH profiles.
- Both video-rated cameras identified the same genetic changes as the scientific-grade camera in real CGH experiments.
Conclusions:
- CGH analysis is not stringent regarding camera resolution requirements.
- Low-priced, 8-bit video-rated CCD cameras with frame integration capabilities are sufficient for CGH.
- This finding may reduce the cost of equipment for CGH analysis.