SSC07-04

Deep Learning-Based Automated Segmentation of Prostate Cancer on Multiparametric MRI: Comparison with Experienced Uroradiologists

Monday, Dec. 2 11:00AM - 11:10AM Room: E260



Participants
Wonmo Jung, Seoul, Korea, Republic Of (Presenter) Nothing to Disclose
Sung Il Hwang, MD, Seongnam, Korea, Republic Of (Abstract Co-Author) Nothing to Disclose
Sejin Park, MS, Seoul, Korea, Republic Of (Abstract Co-Author) Nothing to Disclose
Jin-Kyeong Sung, MD, Seoul, Korea, Republic Of (Abstract Co-Author) Employee, VUNO Inc
Kyu-Hwan Jung, PhD, Seoul, Korea, Republic Of (Abstract Co-Author) Employee, VUNO Inc
Hyungwoo Ahn, MD, Seongnam, Korea, Republic Of (Abstract Co-Author) Nothing to Disclose
Hak Jong Lee, MD, PhD, Seongnam, Korea, Republic Of (Abstract Co-Author) Nothing to Disclose
Sang Youn Kim, Seoul, Korea, Republic Of (Abstract Co-Author) Nothing to Disclose
Myoung Seok Lee, MD, Seoul, Korea, Republic Of (Abstract Co-Author) Nothing to Disclose
Younggi Kim, Seongnam , Korea, Republic Of (Abstract Co-Author) Nothing to Disclose

For information about this presentation, contact:

wm.jung@vuno.co

PURPOSE

To compare the performance of deep learning based prostate cancer (PCa) segmentation with manual segmentation of experienced uroradiologists.

METHOD AND MATERIALS

From 2011 Jan to 2018 Apr, 350 patients who underwent prostatectomy for prostate cancer were enrolled retrospectively. To collect histopathological ground truth, pathologic slides of whole resected prostate were scanned and PCa lesions were drawn by a uropathologist with 25 years' experience. With reference to the histopathological lesion, radiological ground truth of PCa was drawn on the T2 weighted image by a uroradiologist with 19 years' experience. A U-Net type deep neural network, in which the encoder part has more convolution blocks than the decoder, was trained for segmentation. Four different MR sequences including T2 weighted images, diffusion weighted images (b = 0, 1000), and apparent diffusion coefficient (ADC) images, were used as input images after affine registration. Besides the automatic segmentation by the deep neural network, two experienced uroradiologists marked suspected sectors of PCa among 39 sectors provided by PIRADS-v2 after reviewing same images of four MR sequences. The manual segmentation performance of uroradiologists was measured using the number of sectors that coincided with the ground truth PCa lesion.

RESULTS

The dice coefficient scores (DCSs) achieved by two uroradiologists were 0.490 and 0.310 respectively. The DCS was calculated based on the number of sectors. The DCS of automatic segmentation by a deep neural network was 0.558 (calculated by the number of pixels) which is slightly better than the average (0.40) DCSs of uroradiologists.

CONCLUSION

Automated segmentation of PCa on multiparametric MR based on histopathologically confirmed lesion label achieved comparable performance with experienced uroradiologist.

CLINICAL RELEVANCE/APPLICATION

The automated segmentation of prostate cancer using a deep neural network not only reduce time consuming work but also provide reliable location and size information required for treatment decision.

Printed on: 12/06/19