Prostate zonal segmentation in 1.5T and 3T T2W MRI using a convolutional neural network

Carina Jensen, Kristine Storm Sørensen, Cecilia Klitgaard Jørgensen, Camilla Winther Nielsen, Pia Christine Høy, Niels-Christian Langkilde, Lasse Riis Østergaard

Research output: Contribution to journalJournal articleResearchpeer-review

14 Citations (Scopus)
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Abstract

Zonal segmentation of the prostate gland using magnetic resonance imaging (MRI) is clinically important for prostate cancer (PCa) diagnosis and image-guided treatments. A two-dimensional convolutional neural network (CNN) based on the U-net architecture was evaluated for segmentation of the central gland (CG) and peripheral zone (PZ) using a dataset of 40 patients (34 PCa positive and 6 PCa negative) scanned on two different MRI scanners (1.5T GE and 3T Siemens). Images were cropped around the prostate gland to exclude surrounding tissues, resampled to 0.5 × 0.5 × 0.5    mm   voxels and z -score normalized before being propagated through the CNN. Performance was evaluated using the Dice similarity coefficient (DSC) and mean absolute distance (MAD) in a fivefold cross-validation setup. Overall performance showed DSC of 0.794 and 0.692, and MADs of 3.349 and 2.993 for CG and PZ, respectively. Dividing the gland into apex, mid, and base showed higher DSC for the midgland compared to apex and base for both CG and PZ. We found no significant difference in DSC between the two scanners. A larger dataset, preferably with multivendor scanners, is necessary for validation of the proposed algorithm; however, our results are promising and have clinical potential.

Original languageEnglish
Article number014501
JournalJournal of medical imaging (Bellingham, Wash.)
Volume6
Issue number1
Number of pages8
ISSN2329-4302
DOIs
Publication statusPublished - Jan 2019

Keywords

  • Convolutional neural net
  • Magnetic resonance imaging
  • Prostate cancer
  • Zonal segmentation

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