IEEE Trans Image Process - A feature-based learning framework for accurate prostate localization in CT images.

Tópicos

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Resumo

Automatic segmentation of prostate in CT images plays an important role in medical image analysis and image guided radiation therapy. It remains as a challenging problem mainly due to three issues: First, the image contrast between the prostate and its surrounding tissues is low in prostate CT images and no obvious boundaries can be observed. Second, the unpredictable prostate motion causes large position variations of the prostate in the treatment images scanned at different treatment days. Third, the uncertainty of the existence of bowel gas in treatment images significantly changes the image appearance even for images taken from the same patient. To address these issues, in this paper we are motivated to propose a feature based learning framework for accurate prostate localization in CT images. The main contributions of the proposed method lie in the following aspects: (1) Anatomical features are extracted from input images and adopted as signatures for each voxel. The most robust and informative features are identified by the feature selection process to help localize the prostate. (2) Regions with salient features but irrelevant to the localization of prostate, such as regions filled with bowel gas are automatically filtered out by the proposed method. (3) An online update mechanism is adopted in this paper to adaptively combine both population information and patient-specific information to localize the prostate. The proposed method is evaluated on a CT prostate dataset of 24 patients to localize the prostate, where each patient has more than 10 longitudinal images scanned at different treatment times. It is also compared with several state-of- the-art prostate localization algorithms in CT images, and the experimental results demonstrate that the proposed method achieves the highest localization accuracy among all the methods under comparison.

Resumo Limpo

automat segment prostat ct imag play import role medic imag analysi imag guid radiat therapi remain challeng problem main due three issu first imag contrast prostat surround tissu low prostat ct imag obvious boundari can observ second unpredict prostat motion caus larg posit variat prostat treatment imag scan differ treatment day third uncertainti exist bowel gas treatment imag signific chang imag appear even imag taken patient address issu paper motiv propos featur base learn framework accur prostat local ct imag main contribut propos method lie follow aspect anatom featur extract input imag adopt signatur voxel robust inform featur identifi featur select process help local prostat region salient featur irrelev local prostat region fill bowel gas automat filter propos method onlin updat mechan adopt paper adapt combin popul inform patientspecif inform local prostat propos method evalu ct prostat dataset patient local prostat patient longitudin imag scan differ treatment time also compar sever stateof theart prostat local algorithm ct imag experiment result demonstr propos method achiev highest local accuraci among method comparison

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