Related Experiment Video
Updated: Apr 24, 2026
16:10
A TIRF Microscopy Technique for Real-time, Simultaneous Imaging of the TCR and its Associated Signaling Proteins
Published on: March 22, 2012
25.3K
Simple and rapid CD4 testing based on large-field imaging system composed of microcavity array and two-dimensional
Tatsuya Saeki1, Yuriko Sugamura1, Masahito Hosokawa1
1Division of Biotechnology and Life Science, Institute of Engineering, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan.
Biosensors & Bioelectronics
|September 7, 2014
Summary
A new large-field imaging system offers rapid CD4 testing using microcavities to isolate leukocytes. This method provides accurate CD4/CD8 ratios for HIV/AIDS monitoring from small blood samples.
Area of Science:
- Biomedical Engineering
- Immunology
- Medical Diagnostics
Background:
- Accurate CD4 testing is crucial for HIV/AIDS management and treatment monitoring.
- Current CD4 testing methods can be time-consuming and require specialized equipment.
- There is a need for rapid, simple, and accessible CD4 testing solutions.
Purpose of the Study:
- To develop and validate a novel, rapid CD4 testing method using one-shot large-field imaging.
- To assess the system's ability to accurately determine CD4/CD8 T cell ratios.
- To evaluate the potential of this technology for point-of-care HIV/AIDS monitoring.
Main Methods:
- Fabrication of a desk-top sized instrument featuring a microcavity array and a 2D photosensor.
- Utilizing microcavities for leukocyte separation from whole blood based on cell size.
- Implementing dual-color imaging for simultaneous detection of CD4(+) and CD8(+) T cells within a large field of view (64 mm(2)).
Main Results:
- Achieved high signal-to-noise ratio cell signatures due to optimized illumination and metallic substrate blocking.
- Demonstrated dual-color imaging of CD4(+) and CD8(+) T cells in 2 seconds.
- Obtained CD4/CD8 ratios from microliter blood samples (finger-prick equivalent) that correlated well with microscopic analysis.
Conclusions:
- The proposed large-field imaging system offers a simple and rapid method for CD4 testing.
- This technology shows promise for improving accessibility to CD4 counts in HIV/AIDS treatment.
- The system's performance indicates its potential for widespread clinical application.
