Data frame selection for cytometer analysis

• US 20060066852A1
• Filed: 09/27/2004
• Published: 03/30/2006
• Est. Priority Date: 09/27/2004
• Status: Active Grant

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Padmanabhan, Aravind, Fritz, Bernard S., Reutiman, Peter
• Granted Patent: US 7,130,046 B2
• Time in Patent Office: Days
• US Class Current: 356/343
• CPC Class Codes: G01N 15/1404 Handling flow, e.g. hydrodynamic focusing
• CPC Class Codes: G01N 15/1459 the analysis being performed on a sample stream
• CPC Class Codes: G01N 15/1484 microstructural devices
• CPC Class Codes: G01N 2015/1027 Determining speed or velocity of a particle
• CPC Class Codes: G01N 2015/1413 Hydrodynamic focussing
• CPC Class Codes: G01N 2015/1477 Multiparameters
• CPC Class Codes: G01N 2015/1486 Counting the particles
• CPC Class Codes: G01N 2015/1493 Particle size

Abstract

A system for detecting when a core stream in a channel of a flow device is adequate for sufficient data accession. The system may determine the time period from the beginning of a sample run in a channel of a flow device to when the core stream is adequate. Data of detected FALS versus SALS light scattered by particles of the core stream may be plotted in data frames during a series of time intervals. The quality of the grouping and count rate of the data may indicate which frame and corresponding time interval reveal an adequate core stream.

Claims

1. A method for detecting an optimum core stream in a channel, comprising:

at a starting time, providing a sample of particles to form a core stream that flows in a channel;

directing light at the particles of the core stream flowing in the channel;

detecting light scattered by the particles in the core stream during a series of time intervals;

converting the light scattered by the particles detected at a forward angle light scattering (FALS) angle and a small angle light scattering (SALS) angle, into FALS versus SALS data for each interval of time of the series of time intervals after the starting time;

analyzing the FALS versus SALS data for each interval of time; and

selecting a time duration from the series of time intervals where the FALS versus SALS data exhibit an approximately certain count and grouping of data.

2. The method of claim 1, wherein the certain count and grouping of data indicate a core stream sufficient for data acquisition.

3. The method of claim 2, wherein the optimum core stream is a core stream sufficient for adequate data accession.

4. The method of claim 3, wherein the particles have approximately the same size.

5. The method of claim 3, wherein the particles have at least two different sizes.

6. The method of claim 5, wherein the core stream is stabilized at the time interval the where FALS versus SALS data reveal at least two significantly tight groupings and an approximately certain count.

7. The method of claim 6, wherein a stabilized core stream is sufficient for adequate data accession.

8. The method of claim 1, wherein the certain grouping of data reveals a core stream sufficient for data taking by a flow device.

9. The method of claim 8, wherein:

the channel is of a flow device; and

the selected time duration is a characteristic of the flow device.

10. The method of claim 9, wherein the flow device is a cytometer.

11. The method of claim 9, wherein the flow device is for hematology applications.

12. The method of claim 9, wherein the flow device is for environmental applications.

13. The method of claim 9, wherein the flow device is for biological warfare applications.

14. The method of claim 9, further comprising detecting a core stream, sufficient for data taking, in a channel of another flow device, in accordance with claims 1, 8 and 9.

15. An optimization detection system comprising:

a processor connected to a FALS and SALS detector mechanism situated proximate to a light source arrangement having a flow channel situated between the FALS and SALS detector mechanism and the light source arrangement; and

wherein the processor is for recording signals from the FALS and SALS detector mechanism.

16. The system of claim 15, wherein the processor is further for providing an output comprising a FALS signal versus a SALS signal for each particle detected in the flow channel.

17. The system of claim 16, wherein:

the output comprises a plurality of frames;

each frame of the plurality of frames contains a plot of the FALS signal versus the SALS signal for each particle detected in the flow channel for a time interval; and

the time interval is of a series of time intervals beginning at an entry of particles into the flow channel to form a core stream.

18. The system of claim 17, wherein the frames of plots of the FALS signals versus the SALS signals are reviewable for determination of a condition of a core stream of particles in the flow channel during each time interval.

19. The system of claim 18, wherein:

the condition of the core stream determines whether adequate data may be taken from the core stream;

if the condition of the core stream indicates that adequate data may be taken form the core stream, then a time interval of that condition is identified;

a duration of time is identified between the time interval and the entry of particles into the flow channel; and

the duration of time indicates when adequate data accession of the particles may be performed.

20. The system of claim 15, wherein the processor comprises an algorithm for processing the signals from the FALS and SALS detector mechanism to detect when a core stream is adequate for data taking.

21. A method for detecting an optimum core stream in a flow channel, comprising:

beginning an insertion of particles to form a core stream sheathed by a fluid to flow in a channel;

directing light at the particles in the channel;

detecting and converting light scattered by the particles into electrical signals; and

processing the electrical signals in accordance with an algorithm for a determination of when the core stream is optimum for data taking.

22. The method of claim 21, further comprising measuring the lapsed time between the insertion of particles to form the core stream and when the core steam is optimum for data taking.

23. The method of claim 22, wherein the detecting light scattered by the particles is of light at a forward angle light scattering (FALS) angle and a small angle light scattering (SALS) angle.

24. The method of claim 23, further comprising:

plotting the electrical signals as FALS versus SALS data in a frame during a time interval; and

wherein;

a series of time intervals occur during the lapsed time after the insertion of particles; and

the frames of the time intervals are evaluated and an at least one frame is selected indicating that the core stream is optimum for data taking.

25. The method of claim 24, wherein:

the at least one frame selected is of an identifiable time interval of the series of time intervals;

the time intervals have equal durations; and

a duration of time after the insertion of particles is determined according to a number of time intervals since the insertion of particles to the identifiable time interval.

26. The method of claim 25, the duration of time is the amount of time after the insertion of particles that the core stream is sufficiently stable for data taking from the channel.

27. The method of claim 26, wherein:

the channel is of a flow device; and

the duration of time is a characteristic of the flow device.

28. The method of claim 27, further comprising detecting an optimum core stream in a channel of another flow device in accordance with claims 21 through 27.

29. The method of claim 27, wherein the flow device is a cytometer.

30. The method of claim 27, wherein the flow device is for hematology applications.

31. The method of claim 27, wherein the flow device is for biological warfare applications.

32. The method of claim 27, wherein the flow device is for environmental applications.

33. The method of claim 25, wherein the particles are beads of similar sizes.

34. The method of claim 25, wherein the particles are beads of several different sizes.

35. Means for detecting an optimum core stream in a channel of a flow device, comprising:

means for providing particles to form a core stream that flows in a channel starting at time zero;

means for directing light at the particles of the core stream flowing in the channel; and

means for determining an optimum core stream from light scattered by the particles.

36. The means of claim 35, wherein the means for determining an optimum core stream comprises:

means for detecting light scattered by the particles at a set of scattering angles;

means for converting detected light into data signals;

means for analyzing the data signals for each time interval after time zero; and

means for selecting a time interval where the data signals indicate an optimum core stream sufficient for data accession.

37. The means of claim 36, wherein the particles are about the same size.

38. The means of claim 36, wherein the flow device is a cytometer.

39. The means of claim 36, wherein the flow device is for hematology applications.

40. The means of claim 36, wherein the flow device is a for biological warfare applications.

41. The means of claim 36, wherein the flow device is for environmental applications.

42. A data frame selection system comprising:

a processor connected to a light scatter detector mechanism proximate to a light source arrangement having a flow channel situated between the light source arrangement and the light scatter detector mechanism; and

wherein the processor comprises an analyzer for identifying an optimum flow of a core stream in the flow channel sufficient for data taking.