High Sensitivity and High Throughput Magnetic Flow CMOS Cytometers With 2D Oscillator Array and Inter-Sensor...

Area of Science:

• Biomedical Engineering
• Microfluidics
• Sensor Technology

Background:

• Traditional flow cytometry faces limitations in high-throughput rare cell detection due to sensitivity and specificity trade-offs.
• Hydrodynamic focusing is often required, limiting sample flow and increasing complexity.

Purpose of the Study:

• To develop an integrated flow cytometer with a 2D magnetic sensor array for high-throughput, sensitive, and specific rare cell detection.
• To overcome the sensitivity-specificity trade-off inherent in high-throughput analysis.

Main Methods:

• An integrated flow cytometer chip utilizing a 2D array of magnetic sensors based on dual-frequency oscillators in a 65-nm CMOS process.
• Advanced signal processing, including inter-site cross-correlation of sensor spectrograms and two distinct methods for suppressing low-frequency drifts.
• Demonstration using magnetically tagged dielectric particles and cultured lymphoma cancer cells on a 7x7 sensor array.

Main Results:

• Achieved high throughput without hydrodynamic focusing, allowing uninhibited sample flow.
• Drastically suppressed false detection probability through inter-site cross-correlation, reaching theoretical sensitivity towards sub-parts per million (sub-ppM) levels.
• Successfully demonstrated the system's capability in detecting magnetically tagged particles and cancer cells.

Conclusions:

• The integrated flow cytometer with a 2D magnetic sensor array offers a promising platform for sensitive and specific rare cell detection.
• The developed signal processing techniques are crucial for achieving high throughput while maintaining accuracy.
• This technology has significant potential for applications in early cancer diagnosis and monitoring, such as circulating tumor cell detection.