title: Combining Population and Patient-Specific Characteristics for Prostate Segmentation on 3D CT Images.
abstract: Prostate segmentation on CT images is a challenging task. In this paper, we explore the population and patient-specific characteristics for the segmentation of the prostate on CT images. Because population learning does not consider the inter-patient variations and because patient-specific learning may not perform well for different patients, we are combining the population and patient-specific information to improve segmentation performance. Specifically, we train a population model based on the population data and train a patient-specific model based on the manual segmentation on three slice of the new patient. We compute the similarity between the two models to explore the influence of applicable population knowledge on the specific patient. By combining the patient-specific knowledge with the influence, we can capture the population and patient-specific characteristics to calculate the probability of a pixel belonging to the prostate. Finally, we smooth the prostate surface according to the prostate-density value of the pixels in the distance transform image. We conducted the leave-one-out validation experiments on a set of CT volumes from 15 patients. Manual segmentation results from a radiologist serve as the gold standard for the evaluation. Experimental results show that our method achieved an average DSC of 85.1% as compared to the manual segmentation gold standard. This method outperformed the population learning method and the patient-specific learning approach alone. The CT segmentation method can have various applications in prostate cancer diagnosis and therapy.
authors.affiliation: Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA; School of Computer Science, Beijing Institute of Technology, Beijing.
authors.forename: Ling
authors.initials: L
authors.lastname: Ma
authors.affiliation: Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA.
authors.forename: Rongrong
authors.initials: R
authors.lastname: Guo
authors.affiliation: Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA.
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Tian
authors.affiliation: Department of R&D, Eigen, Grass Valley, CA.
authors.forename: Rajesh
authors.initials: R
authors.lastname: Venkataraman
authors.affiliation: Department of R&D, Eigen, Grass Valley, CA.
authors.forename: Saradwata
authors.initials: S
authors.lastname: Sarkar
authors.affiliation: School of Computer Science, Beijing Institute of Technology, Beijing.
authors.forename: Xiabi
authors.initials: X
authors.lastname: Liu
authors.affiliation: Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA.
authors.forename: Funmilayo
authors.initials: F
authors.lastname: Tade
authors.affiliation: Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA.
authors.forename: David M
authors.initials: DM
authors.lastname: Schuster
authors.affiliation: Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA; Winship Cancer Institute of Emory University, Atlanta, GA; The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA.
authors.forename: Baowei
authors.initials: B
authors.lastname: Fei
keywords: CT; image segmentation; patient-specific characteristics; population characteristics; prostate