Abstract
Purpose
Ultrasound imaging is routinely used in prostate biopsy, which involves obtaining prostate tissue samples using a systematic, yet, non-targeted approach. This approach is blinded to individual patient intraprostatic pathology, and unfortunately, has a high rate of false negatives.
Methods
In this paper, we propose a deep network for improved detection of prostate cancer in systematic biopsy. We address several challenges associated with training such network: (1) Statistical labels: Since biopsy core’s pathology report only represents a statistical distribution of cancer within the core, we use multiple instance learning (MIL) networks to enable learning from ultrasound image regions associated with those data; (2) Limited labels: The number of biopsy cores are limited to at most 12 per patient. As a result, the number of samples available for training a deep network is limited. We alleviate this issue by effectively combining Independent Conditional Variational Auto Encoders (ICVAE) with MIL. We train ICVAE to learn label-invariant features of RF data, which is subsequently used to generate synthetic data for improved training of the MIL network.
Results
Our in vivo study includes data from 339 prostate biopsy cores of 70 patients. We achieve an area under the curve, sensitivity, specificity, and balanced accuracy of 0.68, 0.77, 0.55 and 0.66, respectively.
Conclusion
The proposed approach is generic and can be applied to several other scenarios where unlabeled data and noisy labels in training samples are present.
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This work is funded in part by the Canadian Institutes of Health Research (CIHR) and in part by the Natural Sciences and Engineering Research Council of Canada (NSERC)
Golara Javadi and Samareh Samadi are Joint first authors. Parvin Mousavi, Peter Black and Purang Abolmaesumi are Joint senior authors.
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Javadi, G., Samadi, S., Bayat, S. et al. Multiple instance learning combined with label invariant synthetic data for guiding systematic prostate biopsy: a feasibility study. Int J CARS 15, 1023–1031 (2020). https://doi.org/10.1007/s11548-020-02168-1
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DOI: https://doi.org/10.1007/s11548-020-02168-1