Automated tissue image analysis

A stained histologic specimen, sandwiched between a glass microscope slide and coverslip, mounted on the stage of a light microscope.
Microscopic view of a histologic specimen of human lung tissue stained with hematoxylin and eosin.

Automated tissue image analysis is a process by which computer-controlled automatic test equipment is used to evaluate tissue samples, using computations to derive quantitative measurements from an image to avoid subjective errors.

In a typical application, automated tissue image analysis could be used to measure the aggregate activity of cancer cells in a biopsy of a cancerous tumor taken from a patient. In breast cancer patients, for example, automated tissue image analysis may be used to test for high levels of proteins known to be present in more aggressive forms of breast cancers.

Applications

Automated tissue imaging analysis can significantly reduce uncertainty in characterizing tumors compared to evaluations done by histologists,[1] or improve the prediction rate of recurrence of some cancers.[2][3] As it is a digital system, suitable for networking, it also facilitates cooperative efforts between distant sites.[4] Systems for automatically analyzing tissue samples also reduce costs and save time.[1]

High-performance CCD cameras are used for acquiring the digital images. Coupled with advanced widefield microscopes and various algorithms for image restoration, this approach can provide better results than confocal techniques at comparable speeds and lower costs.[5]

Processes

The United States Food and Drug Administration classifies these systems as medical devices, under the general instrumentation category of automatic test equipment.[6]

ATIS have seven basic processes (sample preparation, image acquisition, image analysis, results reporting, data storage, network communication, and self-system diagnostics) and realization of these functions highly accurate hardware and well-integrated, complex, and expensive software.[7]

Preparation

Specimen preparation is critical for evaluating the tumor in the automated system. In the first part of the preparation process the biopsied tissue is cut to an appropriate size (typically 4 mm), fixed in buffered formalin, dehydrated in ethanol-xylene, embedded in paraffin, thin sectioned typically to 4 um slices, then moutned onto at least two barcoded slides (a control and a test). Next the paraffin is removed from the tissue, the tissue is rehydrated, then stained. Any inconsistency in these procedures from case to case may result in uncertainties in the outcome of the analysis. These potential and irreducible inconsistencies in analysis results motivated the development of Automated Tissue Image Systems.

Acquisition

Digital micrographs are acquired of the stained specimen on the glass slide. The images are taken by a set of charge-coupled devices (CCD).[8]

Analysis

Image analysis involves complex computer algorithms which identify and characterize cellular color, shape, and quantity of the tissue sample using image pattern recognition technology based on vector quantization. Vector representations of objects in the image, as opposed to bitmap representations, have superior zoom-in ability. Once the sample image has been acquired and resident in the computer's random access memory as a large array of 0's and 1's, a programmer knowledgeable in cellular architecture can develop deterministic algorithms applied to the entire memory space to detect cell patterns from previously defined cellular structures and formations known to be significant.[9]

The aggregate algorithm outcome is a set of measurements that is far superior to any human sensitivity to intensity or luminance and color hue, while at the same time improving test consistency from eyeball to eyeball.

Reporting

The systems have the capability of presenting the resulting data in text and graphically, including on high definition monitors, to the system user. Computer printers, as relatively low image resolution devices, are used mostly to present final pathology reports that could include text and graphics.

Storage

Storage of the acquired data (graphical digital slide files and text data) involves saving system information in a data storage device system having at least convenient retrieval, and file management capabilities.

Medical imaging industry standards includes the Picture Archiving and Communication Systems (PACS), of European origin, which are image and information management solutions in computer networks that allow hospitals and clinics to acquire, distribute and archive medical images and diagnostic reports across the enterprise. Another standard of European origin is the Data and Picture Archiving and Communication System (DPACS). Although medical images can be stored in various formats, a common format has been Digital Imaging and Communications in Medicine (DICOM).

See also

References

  1. 1 2 O'Gorman, Lawrence; Sanderson, Arthur C.; Preston, Kendall (September 1985). "A System for Automated Liver Tissue Image Analysis: Methods and Results". IEEE Transactions on Biomedical Engineering. BME-32 (9): 696–706. doi:10.1109/TBME.1985.325587. ISSN 0018-9294.
  2. ↑ Teverovskiy, M.; Kumar, V.; Junshui Ma; Kotsianti, A.; Verbel, D.; Tabesh, A.; Ho-Yuen Pang; Vengrenyuk, Y.; Fogarasi, S.; Saidi, O.; Aureon Biosciences Corp., Yonkers, NY, USA (2004-04-18). "Improved prediction of prostate cancer recurrence based on an automated tissue image analysis system". Biomedical Imaging: Nano to Macro, 2004. IEEE International Symposium 1: 257–260. doi:10.1109/ISBI.2004.1398523. ISBN 0-7803-8388-5. CiteSeerX: 10.1.1.58.9929.
  3. ↑ Ali Tabesh, Mikhail Teverovskiy, Ho-Yuen Pang, Vinay P. Kumar, David Verbel, Angeliki Kotsianti, and Olivier Saidi (October 2007). "Multifeature Prostate Cancer Diagnosis and Gleason Grading of Histological Images" (PDF). IEEE Transactions on Medical Imaging 26 (10): 1366–1378. doi:10.1109/TMI.2007.898536. ISSN 0278-0062. PMID 17948727.
  4. ↑ Bruce Mccullough, Xiaoyou Ying, Thomas Monticello and Marc Bonnefoi (2004). "Digital Microscopy Imaging and New Approaches in Toxicologic Pathology". Toxicologic Pathology 32 (2): 49–58. doi:10.1080/01926230490451734.
  5. ↑ Pornchai Phukpattaranont and Pleumjit Boonyaphiphat (2007). "An Automatic Cell Counting Method for a Microscopic Tissue Image from Breast Cancer". IFMBE Proceedings. IFMBE Proceedings 15: 241–244. doi:10.1007/978-3-540-68017-8_63. ISBN 978-3-540-68016-1.
  6. ↑ Testing Computer Systems for FDA/MHRA Compliance - David Stokes - Google Books. Books.google.com. 2003-11-25. ISBN 9780849321634. Retrieved 2012-07-12.
  7. ↑ "Analytica Chimica Acta - Advances in cancer tissue microarray technology: Towards improved understanding and diagnostics". Analytica Chimica Acta 564: 74–81. doi:10.1016/j.aca.2005.11.083.
  8. ↑ MacDonald, J. H.; Wells, K.; Reader, A. J.; Ott, R. J. (February 1997). "A CCD-based tissue imaging system". Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (Nuclear Instruments and Methods in Physics Research) 392 (1–3): 220–226. Bibcode:1997NIMPA.392..220M. doi:10.1016/S0168-9002(97)00297-0.
  9. ↑ Han, J.W., Breckon, T.P., Randell, D.A., Landini, G. (2012). "The Application of Support Vector Machine Classification to Detect Cell Nuclei for Automated Microscopy". Machine Vision and Applications (Springer) 23 (1): 15–24. doi:10.1007/s00138-010-0275-y.
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