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Biomedical Physics & Engineering Express

Resumen/Descripción – provisto por la editorial en inglés

A broad, inclusive, rapid review journal devoted to publishing new research in all areas of biomedical engineering, biophysics and medical physics, with a special emphasis on interdisciplinary work between these fields.

Palabras clave – provistas por la editorial

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No detectada	desde jun. 2015 / hasta dic. 2023	IOPScience

Información

Tipo de recurso:

revistas

ISSN electrónico

2057-1976

Editor responsable

IOP Publishing (IOP)

País de edición

Estados Unidos

Fecha de publicación

2015-

Cobertura temática

Ciencias físicas

Tabla de contenidos

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doi: 10.1088/2057-1976/ab6e18

Liver lesion localisation and classification with convolutional neural networks: a comparison between conventional and spectral computed tomography

Nadav Shapira; Julia Fokuhl; Manuel Schultheiß; Stefanie Beck; Felix K Kopp; Daniela Pfeiffer; Julia Dangelmaier; Gregor Pahn; Andreas P Sauter; Bernhard Renger; Alexander A Fingerle; Ernst J Rummeny; Shadi Albarqouni; Nassir Navab; Peter B Noël

<jats:title>Abstract</jats:title> <jats:p> <jats:italic>Purpose</jats:italic>: To evaluate the benefit of the additional available information present in spectral CT datasets, as compared to conventional CT datasets, when utilizing convolutional neural networks for fully automatic localisation and classification of liver lesions in CT images. <jats:italic>Materials and Methods</jats:italic>: Conventional and spectral CT images (iodine maps, virtual monochromatic images (VMI)) were obtained from a spectral dual-layer CT system. Patient diagnosis were known from the clinical reports and classified into healthy, cyst and hypodense metastasis. In order to compare the value of spectral versus conventional datasets when being passed as input to machine learning algorithms, we implemented a weakly-supervised convolutional neural network (CNN) that learns liver lesion localisation without pixel-level ground truth annotations. Regions-of-interest are selected automatically based on the localisation results and are used to train a second CNN for liver lesion classification (healthy, cyst, hypodense metastasis). The accuracy of lesion localisation was evaluated using the Euclidian distances between the ground truth centres of mass and the predicted centres of mass. Lesion classification was evaluated by precision, recall, accuracy and F1-Score. <jats:italic>Results</jats:italic>: Lesion localisation showed the best results for spectral information with distances of 8.22 ± 10.72 mm, 8.78 ± 15.21 mm and 8.29 ± 12.97 mm for iodine maps, 40 keV and 70 keV VMIs, respectively. With conventional data distances of 10.58 ± 17.65 mm were measured. For lesion classification, the 40 keV VMIs achieved the highest overall accuracy of 0.899 compared to 0.854 for conventional data. <jats:italic>Conclusion</jats:italic>: An enhanced localisation and classification is reported for spectral CT data, which demonstrates that combining machine-learning technology with spectral CT information may in the future improve the clinical workflow as well as the diagnostic accuracy.</jats:p>