Method and apparatus for assessing slide and specimen preparation quality

• US 5,671,288 A
• Filed: 05/31/1995
• Issued: 09/23/1997
• Est. Priority Date: 05/31/1995
• Status: Expired due to Term

• Current Assignee: Tripath Imaging Incorporated (Becton, Dickinson & Co)
• Original Assignee: NeoPath, Inc. (Becton, Dickinson & Co)
• Inventors: Lee, Shih-Jong J., Wilhelm, Paul S.
• Primary Examiner(s): JOHNS, ANDREW W
• Application Number:
  US08/455,182
• Time in Patent Office: 846 Days
• Field of Search: 382/128, 382/133, 382/134, 382/286, 382/289, 382/291, 382/255, 395/924, 348/125, 348/127, 348/128, 356/36, 356/37, 356/38, 356/39, 356/244, 364/413.08, 364/413.13, 209/522, 209/526, 209/528, 427/2.11
• US Class Current: 382/128
• CPC Class Codes: G06T 1/0007 Image acquisition
• CPC Class Codes: G06V 20/69 Microscopic objects, e.g. biological cells or cellular parts

Abstract

An automated biological specimen screener reports an assessment of slide and specimen preparation and quality. The automated biological specimen screener measures, parameters which reflect slide physical characteristics, specimen collection quality, and specimen preparation quality. The automated system reports an objective measure and uses a consistent standard of evaluation. The automated system evaluates characteristics of a slide set from a clinic. The automated system makes a determination of whether these characteristics are within a training capability of a given automated biological screener. Additionally, rather than periodic reviews, slides successfully scanned by the automated system may be used as part of a specimen preparation assessment.

Claims

1. A method for testing a slide set for slide and specimen preparation quality comprising the steps of:

a) evaluating slide and specimen preparation quality for a slide in the slide set to produce an evaluation, wherein the step of evaluating slide and specimen preparation quality further comprises evaluating physical characteristics of the slide; and

b) determining the slide and specimen preparation quality of the slide set based on the evaluation.

2. The method of claim 1 wherein the step of evaluating physical characteristics of a slide further comprises the step of making at least one measurement of slide dimension.

3. The method of claim 1 wherein the step of evaluating physical characteristics of a slide further comprises checking of at least one surface characteristic of a slide coverslip.

4. The method of claim 1 wherein the step of evaluating physical characteristics of a slide further comprises checking whether a length of a slide coverslip is within a set of predetermined limits.

5. The method of claim 1 wherein the step of evaluating physical characteristics of a slide further comprises checking whether a width of a slide coverslip is within predetermined limits.

6. The method of claim 1 wherein the step of evaluating physical characteristics of a slide further comprises checking whether a coverslip area is within predetermined limits.

7. The method of claim 1 wherein the step of evaluating physical characteristics of a slide further comprises checking whether at least one specimen to coverslip top distance is less than a predetermined amount.

8. The method of claim 1 wherein the step of evaluating physical characteristics of a slide further comprises checking whether at least one specimen to coverslip top distance is greater than a predetermined amount.

9. The method of claim 1 wherein the step of evaluating physical characteristics of a slide further comprises checking at least one geometric property of the slide.

10. The method of claim 1 wherein the step of evaluating physical characteristics of a slide further comprises checking whether slide coverslip corners are square to within predetermined limits.

11. The method of claim 1 wherein the step of evaluating physical characteristics of a slide further comprises checking whether a slide coverslip is skewed on the slide more than a predetermined limit.

12. The method of claim 2 wherein the slide is viewed by an automated system having an imager, wherein the imager is capable of focusing on a specimen, the method further including the step of checking whether the imager has focused on the specimen to a predetermined degree of accuracy.

13. The method of claim 1 wherein the step of evaluating slide and specimen preparation quality further comprises evaluating specimen material quality.

14. The method of claim 13 wherein the step of evaluating specimen material quality further comprises the steps of:

a) checking for slide setup related failures; and

b) checking for process suitability failures.

15. The method of claim 13 wherein the step of evaluating specimen material quality further comprises checking for a lack of viewable specimen material in a predetermined central region of a slide.

16. The method of claim 13 wherein the step of evaluating specimen material quality further comprises the step of checking whether there are fewer than a predetermined number of points to focus successfully at low power magnification to create a low power magnification focus surface model.

17. The method of claim 1 wherein the step of evaluating slide and specimen preparation quality further comprises the steps of:

a) testing for preparation quality failures; and

b) testing for slide analysis suitability failures.

18. The method of claim 17 wherein the step of testing for slide analysis suitability failures further comprises the step of counting a number of reference cells and determining if the number of reference cells are within predetermined limits.

19. The method of claim 17 wherein the step of testing for slide analysis suitability failures further comprises the step of checking image saturation.

20. The method of claim 19 wherein the step of checking image saturation further comprises the step of checking image quality for high power magnification image saturation greater than a predetermined amount.

21. The method of claim 19 wherein the step of checking image saturation further comprises the step of checking image quality for low power magnification image saturation greater than a predetermined amount.

22. The method of claim 1 wherein at least one parameter is measured further comprising the step of determining whether at least one parameter is within predetermined limits.

23. A method for testing a slide set for slide and specimen preparation quality comprising the steps of:

a) evaluating slide and specimen preparation quality for a slide in the slide set to produce an evaluation, wherein the step of evaluating slide and specimen quality further comprises evaluating handling quality of the slide; and

b) determining the slide and specimen preparation quality of the slide set based on the evaluation.

24. The method of claim 23 wherein the step of evaluating handling quality of the slide further comprises the steps of:

a) checking slide setup related failures; and

b) checking slide analysis suitability failures.

25. The method of claim 24 wherein the step of checking slide setup related failures further comprises the steps of:

a) checking whether a barcode of a slide was read correctly; and

b) checking whether the slide is tilted greater than a predetermined degree.

26. The method of claim 24 wherein the step of checking slide analysis suitability failures further comprises the steps of:

a) checking an image quality of the slide for more than a predetermined amount of striping; and

b) checking for more than a predetermined amount of image saturation.

27. The method of claim 26 wherein the step of checking image saturation further comprises step of checking image quality of the slide for high power magnification image saturation greater than a first predetermined amount.

28. The method of claim 26 wherein the step of checking image saturation further comprises the step of checking image quality of the slide for high power magnification image saturation greater than a second predetermined amount.

29. The method of claim 26 wherein the step of checking image saturation further comprises the step of checking image quality of the slide for low power magnification image saturation greater than a predetermined amount.

30. A method for testing a slide set for slide and specimen preparation quality comprising the steps of:

a) evaluating slide and specimen preparation quality for a slide in the slide set to produce an evaluation of specimen material quality, wherein the step of evaluating specimen material quality further comprises the step of checking whether a distribution of viewable specimen material on the slide meets predetermined criteria; and

b) determining the slide and specimen preparation quality of the slide set based on the evaluation.

31. A method for testing a slide set for slide and specimen preparation quality, and wherein the slide is viewed by an automated system having an imager, and wherein the imager is capable of focusing on a specimen, the method comprising the steps of:

a) evaluating slide and specimen preparation quality for a slide in the slide set to produce an evaluation of specimen material quality, and wherein the step of evaluating specimen material quality further comprises the step of checking whether the automated system has successfully focused on more than a predetermined number of regions of the specimen; and

b) determining the slide and specimen preparation quality of the slide set based on the evaluation.

32. A method for testing a slide set for slide and specimen preparation quality comprising the steps of:

a) evaluating slide and specimen preparation quality for a slide in the slide set to produce an evaluation of specimen material quality, wherein the step of evaluating specimen material quality further comprises the step of checking whether a specimen is tilted more than a predetermined degree; and

b) determining the slide and specimen preparation quality of the slide set based on the evaluation.

33. A method for testing a slide set for slide and specimen preparation quality comprising the steps of:

a) evaluating slide and specimen preparation quality for a slide in the slide set to produce an evaluation of specimen material quality, wherein the step of evaluating specimen material quality further comprises the step of checking whether there are fewer than a predetermined number of fields ranked after a low power magnification scan; and

b) determining the slide and specimen preparation quality of the slide set based on the evaluation.

34. A method for testing a slide set for slide and specimen preparation quality comprising the steps of:

a) evaluating slide and specimen preparation quality for a slide in the slide set to produce an evaluation of specimen material quality, wherein the step of evaluating specimen material quality further comprises the step of checking whether there are fewer than a predetermined number of points for a high power magnification focus surface model to be created; and

b) determining the slide and specimen preparation quality of the slide set based on the evaluation.

35. A method for testing a slide set for slide and specimen preparation quality comprising the steps of:

a) evaluating slide and specimen preparation quality for a slide in the slide set to produce an evaluation of specimen material quality wherein the step of evaluating specimen material quality further comprises the step of checking whether a high power focus surface is more variable than a predetermined amount; and

b) determining the slide and specimen preparation quality of the slide set based on the evaluation.

36. A method for testing a slide set for slide and specimen preparation quality comprising the steps of:

a) evaluating slide and specimen preparation quality for a slide in the slide set to produce an evaluation of specimen material quality wherein the step of evaluating specimen material quality further comprises the step of checking whether there are fewer than a predetermined number of focused fields in a high power scan; and

b) determining the slide and specimen preparation quality of the slide set based on the evaluation of the slide.

37. A method for testing a slide set for slide and specimen preparation quality comprising the steps of:

evaluating slide and specimen preparation quality for a slide in the slide set to produce an evaluation of specimen material quality wherein the step of evaluating specimen material quality further comprises the step of checking whether there are fewer than a predetermined number of reference cells; and

b) determining the slide and specimen preparation quality of the slide set based on the evaluation.

38. A method for testing a slide set for slide and specimen preparation quality comprising the steps of:

a) evaluating slide and specimen preparation quality for a slide in the slide set to produce an evaluation by testing for preparation quality failures wherein the step of testing for preparation quality failures further comprises the step of checking for more bubble area on the slide than a predetermined amount

b) determining the slide and specimen preparation quality of the slide set based on the evaluation.

39. A method for testing a slide set for slide and specimen preparation quality comprising the steps of:

a) evaluating slide and specimen preparation quality for a slide in the slide set to produce an evaluation by testing for preparation quality failures wherein the step of testing for preparation quality failures further comprises the step of checking staining quality; and

b) determining the slide and specimen preparation quality of the slide set based on the evaluation.

40. The method of claim 39 wherein the step of checking staining quality further comprises checking whether nuclear staining average is within predetermined limits.

41. The method of claim 39 wherein the step of checking staining quality further comprises checking whether cytoplasm staining is within predetermined limits.

42. The method of claim 39 wherein the step of checking staining quality further comprises nuclear staining detail is within predetermined limits.

43. The method of claim 39 wherein the step of checking staining quality further comprises checking whether nuclear-cytoplasm contrast is within predetermined limits.

44. A method for testing a slide set for slide and specimen preparation quality comprising the steps of:

a) evaluating slide and specimen preparation quality for a slide in the slide set to produce an evaluation where at least one parameter is measured, further comprising the step of determining whether the at least one parameter is within a training range of a preselected automated system; and

b) determining the slide and specimen preparation quality of the slide set based on the evaluation.

45. An apparatus for analyzing slide and specimen preparation quality for a population of slides comprising:

a) an image gathering means for obtaining image data, wherein the image data is representative of the population of slides;

b) a means for calculating at least one slide quality measurement connected to receive the image data, having a slide quality data output and further comprising a means for testing slide physical characteristics connected to receive the image data and providing a slide physical characteristics data output connected to the slide quality data output; and

c) a data processing system connected to receive and integrate the slide quality data output wherein the data processing system provides a population suitability data output.

46. The apparatus of claim 45 wherein the means for calculating at least one slide quality measurement comprises a means for testing specimen material quality connected to receive the image data and providing a specimen material quality data output connected to the slide quality data output.

47. The apparatus of claim 45 wherein the image gathering means further comprises an automated microscope.

48. An apparatus for analyzing slide and specimen preparation quality for a population of slides comprising:

a) an image gathering means for obtaining image dam, wherein the image data is representative of the population of slides;

b) a means for calculating at least one slide quality measurement connected to receive the image data, having a slide quality data output further comprising a means for testing slide handling quality connected to receive the image data and providing a slide handling quality data output connected to the slide quality data output; and

c) a data processing system connected to receive and integrate the slide quality data output wherein the data processing system provides a population suitability data output.

49. An apparatus for analyzing slide and specimen preparation quality for a population of slides comprising:

a) an image gathering means for obtaining image data, wherein the image data is representative of the population of slides;

b) a means for calculating at least one slide quality measurement connected to receive the image data, having a slide quality data output further comprising a means for testing system accuracy connected to receive the image data and providing a system accuracy data output connected to the slide quality data output; and

c) a data processing system connected to receive and integrate the slide quality data output wherein the dam processing system provides a population suitability data output.

50. An apparatus for analyzing slide and specimen preparation quality for a population of slides comprising:

a) an image gathering means for obtaining image data, wherein the image data is representative of the population of slides;

b) a means for calculating at least one slide quality measurement connected to receive the image data, having a slide quality data output; and

c) a data processing system connected to receive and integrate the slide quality data output wherein the data processing system provides a population suitability data output further comprising a means for providing a recommendation for changes in slide handling techniques.

51. An apparatus for analyzing slide and specimen preparation quality for a population of slides comprising:

a) an image gathering means for obtaining image data, wherein the image data is representative of the population of slides;

b) a means for calculating at least one slide quality measurement connected to receive the image data, having a slide quality data output; and

c) a data processing system connected to receive and integrate the slide quality data output wherein the data processing system provides a population suitability data in specimen preparation techniques output further comprising a means for providing a recommendation for changes in specimen preparation techniques.

52. A method for testing a slide set for slide and specimen preparation quality comprising the steps of:

a) evaluating slide and specimen preparation quality for a slide in the slide set to produce an evaluation of specimen material quality by checking whether there is less than a predetermined percentage of fields focused on an at least one initial try; and

b) determining the slide and specimen preparation quality of the slide set based on the evaluation.

53. A method for testing a slide set for slide and specimen preparation quality comprising the steps of:

a) evaluating slide and specimen preparation quality for a slide in the slide set to produce an evaluation of specimen material quality by checking whether there is more than a predetermined percentage of fields never focused; and

b) determining the slide and specimen preparation quality of the slide set based on the evaluation.

54. A method for testing a slide set for slide and specimen preparation quality comprising the steps of:

a) evaluating slide and specimen preparation quality for a slide in the slide set to produce an evaluation by testing for preparation quality failures by checking for fewer fields with sufficient ranking after a low power magnification scan than a predetermined amount; and

b) determining the slide and specimen preparation quality of the slide set based on the evaluation of the slide.