System and method for estimating extracorporeal blood volume in a physical sample

• US 8,792,693 B2
• Filed: 07/09/2012
• Issued: 07/29/2014
• Est. Priority Date: 07/09/2011
• Status: Active Grant

• Current Assignee: Gauss Surgical, Gauss Surgical, Inc. (Stryker Corporation)
• Original Assignee: Gauss Surgical
• Inventors: Satish, Siddarth, Zhao, Charles, Miller, Kevin, Zandifar, Ali, Abdulla, Amer, Hsieh, Michael, Rempel, David, Gonzalgo, Mark
• Primary Examiner(s): BHATNAGAR, ANAND P
• Application Number:
  US13/544,646
• Publication Number:
  US 20130011042A1
• Time in Patent Office: 750 Days
• Field of Search: 382128-134, 382141-143, 128/922, 378/51, 378/52, 378/53, 378/54, 378/62, 348/86, 348/91, 348/92, 348/143, 356/4.01, 356/27, 356/28.5, 356 39- 42, 356/300, 356/302, 356/303, 73/10.2, 73/17.3, 702/55, 702/156
• US Class Current: 382/128
• CPC Class Codes: A61B 5/02042 Determining blood loss or bleeding, e.g. during a surgical procedure
• CPC Class Codes: G06T 2207/10024 Color image
• CPC Class Codes: G06T 2207/30004 Biomedical image processing
• CPC Class Codes: G06T 5/00 Image enhancement or restoration
• CPC Class Codes: G06T 7/62 of area, perimeter, diameter or volume

Abstract

One method for estimating the extracorporeal blood volume in a portion of a physical sample includes: comparing a portion of an image of the sample with a template image of known extracorporeal blood volume indicator; tagging the portion of the image of the sample with a blood volume indicator according to the template image that is matched to the portion of the image of the sample; and estimating the extracorporeal blood volume in at least a portion of the physical sample, associated with the portion of the image of the sample, according to the blood volume indicator.

Claims

1. A method for estimating the extracorporeal blood volume in a portion of a physical sample, the method comprising:

comparing a portion of an image of the sample with a template image of known extracorporeal blood volume indicator;

tagging the portion of the image of the sample with a blood volume indicator according to the template image that is matched to the portion of the image of the sample; and

estimating the extracorporeal blood volume in at least a portion of the physical sample, associated with the portion of the image of the sample, according to the blood volume indicator.

2. The method of claim 1, further comprising identifying the physical sample in the image as a type of absorbent gauze sponge.

3. The method of claim 2, further comprising indexing a sample counter for the physical sample that is identified as an absorbent gauze sponge.

4. The method of claim 3, further comprising identifying the physical sample as a physical sample identified in a previous image, wherein the sample counter is indexed when the physical sample is identified as unique amongst the physical samples in the previous images.

5. The method of claim 2, wherein comparing the portion of the image of the sample with the template image comprises selecting the template image for comparison based upon the type of absorbent gauze sponge of the physical sample.

6. The method of claim 1, wherein estimating the extracorporeal blood volume in at least the portion of the sample comprises estimating the total extracorporeal blood volume in the physical sample based upon aggregated blood volume indicator tags of the portion of the image of the sample and substantially all other portions of the image.

7. The method of claim 6, further comprising estimating patient blood loss by aggregating the estimated total extracorporeal blood volume in the physical sample and estimated total extracorporeal blood volumes in additional physical samples in additional images.

8. The method of claim 1, wherein comparing the portion of the image of the sample with the template image comprises pairing the portion of the image of the sample and the template image via template matching.

9. The method of claim 8, wherein comparing the portion of the image of the sample with the template image comprises selecting the template image from a library of template images of known extracorporeal blood volume indicators.

10. The method of claim 8, wherein comparing the portion of the image of the sample with the template image comprises calculating the absolute difference in pixel intensity for a plurality of pixels in each of the portion of the image of the sample and the template image.

11. The method of claim 1, wherein comparing the portion of the image of the sample with the template image comprises calculating a color intensity value in a color component space for each pixel of the portion of the image of the sample, generating a histogram of the nearest-patch-centroid indices around each pixel, and pairing the portion of image of the sample with the template image based upon a comparison of pixel centroid histograms.

12. The method of claim 1, wherein comparing the portion of the image of the sample with the template image comprises accessing the template image that comprises a color model paired with the blood volume indicator and generating the blood volume indicator tag that is a composite of the known blood volume indicators of the template image and a second template image, wherein the second template image comprises a second color model paired with a second blood volume indicator.

13. The method of claim 1, wherein tagging the portion of the image of the sample with the blood volume indicator comprises tagging the portion of the image of the sample with an estimated hemoglobin mass.

14. The method of claim 13, wherein estimating the extracorporeal blood volume in at least the portion of the physical sample comprises estimating the extracorporeal blood volume in at least the portion of the physical sample according to the hemoglobin mass and an estimated hematocrit of blood in the physical sample.

15. The method of claim 1, further comprising capturing the image through an optical sensor arranged within a mobile electronic device.

16. The method of claim 15, further comprising displaying, on a display of the mobile electronic device, the estimated extracorporeal blood volume in at least the portion of the physical sample.

17. The method of claim 1, further comprising updating a digital medical record of a patient with estimated blood volume in at least the portion of the physical sample.

18. The method of claim 1, wherein estimating the extracorporeal blood volume in at least the portion of the physical sample comprises associating a physical dimension of the physical sample with the portion of the image of the sample by transforming the portion of the image according to at least one of an estimated distance and an estimated angle between a capture origin of the image and the physical sample.

19. A system for determining the extracorporeal blood volume in a physical sample, the system comprising:

an optical sensor that captures an image of the physical sample;

a processor that compares a portion of the image of the sample with a template image of known blood volume indicator, tags the portion of the image of the sample with a blood volume indicator according to the template image that is matched to the portion of the image of the sample, and estimates the extracorporeal blood volume in at least a portion of the physical sample, associated with the portion of the image of the sample, according to the blood volume indicator; and

a display that depicts the estimated blood volume in at least the portion of the physical sample.

20. The system of claim 19, wherein the optical sensor is a camera, and wherein the processor is further configured to determine at least one of the angle of the camera relative to the physical sample and the distance between the camera and the physical sample at the time of the image was captured.

21. The system of claim 19, wherein the optical sensor is configured to be mounted overhead a surgical operating table.

22. The system of claim 19, further comprising a handheld housing configured to contain the optical sensor, the processor, and the display.

23. The system of claim 22, further comprising a wireless communication module that communicates the estimated blood volume in the portion of the physical sample to a remote server configured to store an electronic medical record of a patient.

24. The system of claim 19, further comprising a data storage module configured to store a library of template images of known blood volume indicators, wherein the processor is configured to access the template image from the data storage module for comparison with the portion of the image of the sample.