Frequency domain discrimination and counting technique

Details Frequency domain discrimination and counting technique Frequency domain discrimination and counting technique

1975-11-04

1977-08-16

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Interference pattern analysis

250222PC, 250570, G06M 700, G02B 2738

Patent

active

040428290

ABSTRACT:
An apparatus and method for counting the number of objects-of-interest present in a selected sample by scanning the sample with a rotating reticle of preselected design to measure the spatial frequency components in the field-of-view, which components are definitive of the number of objects-of-interest present. The spacing within the reticle pattern determines the size of the objects that will be counted. The invention has significant application as a means for counting bone marrow granulocyte precursor colonies in the detection and treatment of leukemia.

REFERENCES:
patent: 3364811 (1968-01-01), Baruch et al.
patent: 3733136 (1973-05-01), Porath-Furedi
patent: 3743427 (1973-07-01), Weiser
patent: 3809478 (1974-05-01), Talbot
patent: 3833864 (1974-09-01), Kiess et al.
Fallon, "Design Consideration for a Linear Microdensitometer", Optical Eneering, vol. 12, No. 6, p. 206.

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