We describe a new optical detection technique, termed "spatially modulated fluorescence emission," that delivers high signal-to-noise discrimination without precision optics to enable a flow cytometer that can combine high performance, robustness, compactness, low cost, and ease of use. The detection technique is demonstrated with measurements of absolute CD4+ and percentage CD4 counts in human blood. Benchmarking against a commonly used commercial instrument for this test yields excellent agreement for both absolute CD4 and percentage CD4.
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Kiesel et al. (2011) studied this question.
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