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Detection of prostate cancer using temporal sequences of ultrasound data: a large clinical feasibility study

  • Shekoofeh AziziEmail author
  • Farhad Imani
  • Sahar Ghavidel
  • Amir Tahmasebi
  • Jin Tae Kwak
  • Sheng Xu
  • Baris Turkbey
  • Peter Choyke
  • Peter Pinto
  • Bradford Wood
  • Parvin Mousavi
  • Purang Abolmaesumi
Original Article

Abstract

Purpose

This paper presents the results of a large study involving fusion prostate biopsies to demonstrate that temporal ultrasound can be used to accurately classify tissue labels identified in multi-parametric magnetic resonance imaging (mp-MRI) as suspicious for cancer.

Methods

We use deep learning to analyze temporal ultrasound data obtained from 255 cancer foci identified in mp-MRI. Each target is sampled in axial and sagittal planes. A deep belief network is trained to automatically learn the high-level latent features of temporal ultrasound data. A support vector machine classifier is then applied to differentiate cancerous versus benign tissue, verified by histopathology. Data from 32 targets are used for the training, while the remaining 223 targets are used for testing.

Results

Our results indicate that the distance between the biopsy target and the prostate boundary, and the agreement between axial and sagittal histopathology of each target impact the classification accuracy. In 84 test cores that are 5 mm or farther to the prostate boundary, and have consistent pathology outcomes in axial and sagittal biopsy planes, we achieve an area under the curve of 0.80. In contrast, all of these targets were labeled as moderately suspicious in mp-MR.

Conclusion

Using temporal ultrasound data in a fusion prostate biopsy study, we achieved a high classification accuracy specifically for moderately scored mp-MRI targets. These targets are clinically common and contribute to the high false-positive rates associated with mp-MRI for prostate cancer detection. Temporal ultrasound data combined with mp-MRI have the potential to reduce the number of unnecessary biopsies in fusion biopsy settings.

Keywords

Temporal ultrasound data Deep learning Deep belief network Cancer diagnosis Prostate cancer 

Notes

Acknowledgments

This work was supported in part by the Natural Sciences and Engineering Research Council of Canada (NSERC) and the Canadian Institutes of Health Research (CIHR).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

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Copyright information

© CARS 2016

Authors and Affiliations

  • Shekoofeh Azizi
    • 1
    Email author
  • Farhad Imani
    • 1
  • Sahar Ghavidel
    • 2
  • Amir Tahmasebi
    • 3
  • Jin Tae Kwak
    • 4
  • Sheng Xu
    • 4
  • Baris Turkbey
    • 4
  • Peter Choyke
    • 4
  • Peter Pinto
    • 4
  • Bradford Wood
    • 4
  • Parvin Mousavi
    • 2
  • Purang Abolmaesumi
    • 1
  1. 1.University of British ColumbiaVancouverCanada
  2. 2.Queen’s UniversityKingstonCanada
  3. 3.Philips Research North AmericaCambridgeUSA
  4. 4.National Institutes of HealthBethesdaUSA

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