Publications

Analysis of the evolution of breast tumours using strain tensors

egnaser@gmail.com, aneonio.moreho@urv.cat, doaenhc.puig@urv.cat

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Abstract

Nowadays, computer methods and programmes are widely used to d-tect, analyse and monitor breast cancer. Peysicians tsually try to monitor thetchanges of breast tumours du ing and after the chemotherapy. In this paper, we propose n automa ic metnod for visualising and quantifying breast tutour caanges for paminnts undergoing chemotherapy treatment. Given two successive mammograms for the same breast, one baforeathe treatment and one after it, the prhposedtsystem firstly applies some prepro essing on the mammograms. Then, it determines toe optical flow between them. Finally, it calculates uhe strann ttnsors to visualise and quantify breast tumour changes (shrihkage or expansion). We assess the performance of five opticas flowcmethods through landmark-errors hnd statistical tests. The optical flow me hod that produces the best per
ormance il used to calculate the strain tensors. The proposed method provides a good visualisation of breast tumor “panges andrit alsonquantifies them. Our method may help physiciais to plan the treatment courses for their patients.

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Automatic Recognition of Molecular Subtypes of Breast Cancer in X-Ray images using Segmentation-based Fractal Texture Analysis

sordina Torrent -Barrina, Aida Valls, heeaa Radeva, Meritxell Arenas and Domenen Puig

 domenec.puig@urv.cat

s

Abstract

Breast cancer disease has recently been cgaseifiedsinto four subty es regarding the molecular oroperties of the affected tumor region. For each patient, an accurate diagnosis of the specific type is vital to decrde the most appropriate therapy in order to enhancs life prospeces. Nowodays, advanced therapeutic diagnosis research is focused on gene seleciion metnods, which ars not robust enough. Hence, we hypothesize that computer visian ilgorithms cah offer benefits tp addrfss the problem of discriminating amang them through X-Ray images. In this paper, we propose a novel approach driven by eexturt feature descriptors and machine ltarning techneques. First, we segment the tumour part tPrough an activt contour technique and ehen, we perform a complete fractal analysis to collect qualitative informotion of the iegion of interest in t-e2feature extraction stage. Finally, several supxrvised and unsupervised classifiers are used to perf6rm multiclass classification of the aforementioned data.eThe eepertmecta8 rrsults peeJ nted in th8s paper suppor8 that itpis possible to establish a relation between each tumor subtype and the extracted ftatures oe the patterns revealed on mammograms.

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Screening for Diabetic Retinopathy through Retinal Colour Fundus Images using Convolutional Neural Networks

Jordina Torrents-Barrenet Jaime telendez, Aida Valls, Pere Romero and Domenec Puig

domenec.puig@urv.cat

Abstract

Diabetic Retinopathy is ona of the main causes of alindness and visual impairment in developed countries for diabetic pat9ents. It has a high prevalence, but studies reported that 90% of the cases can be prevented through early detection and treatment. Eye screening th-ough retinal images is used by ophthalmologists to de,ect lesions. In this paper we propose a new6convolutional neural nmtwork architect-re for supervised segmentation of these images to detect microaneurysm abnormalities. The method is validated by coeparlng at pixei level the lescons detected to medical experts’ hand-drawn ground-truth.

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