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2014 ; 18
(7
): 1082-100
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On combining image-based and ontological semantic dissimilarities for medical
image retrieval applications
#MMPMID25036769
Kurtz C
; Depeursinge A
; Napel S
; Beaulieu CF
; Rubin DL
Med Image Anal
2014[Oct]; 18
(7
): 1082-100
PMID25036769
show ga
Computer-assisted image retrieval applications can assist radiologists by
identifying similar images in archives as a means to providing decision support.
In the classical case, images are described using low-level features extracted
from their contents, and an appropriate distance is used to find the best matches
in the feature space. However, using low-level image features to fully capture
the visual appearance of diseases is challenging and the semantic gap between
these features and the high-level visual concepts in radiology may impair the
system performance. To deal with this issue, the use of semantic terms to provide
high-level descriptions of radiological image contents has recently been
advocated. Nevertheless, most of the existing semantic image retrieval strategies
are limited by two factors: they require manual annotation of the images using
semantic terms and they ignore the intrinsic visual and semantic relationships
between these annotations during the comparison of the images. Based on these
considerations, we propose an image retrieval framework based on semantic
features that relies on two main strategies: (1) automatic "soft" prediction of
ontological terms that describe the image contents from multi-scale Riesz
wavelets and (2) retrieval of similar images by evaluating the similarity between
their annotations using a new term dissimilarity measure, which takes into
account both image-based and ontological term relations. The combination of these
strategies provides a means of accurately retrieving similar images in databases
based on image annotations and can be considered as a potential solution to the
semantic gap problem. We validated this approach in the context of the retrieval
of liver lesions from computed tomographic (CT) images and annotated with
semantic terms of the RadLex ontology. The relevance of the retrieval results was
assessed using two protocols: evaluation relative to a dissimilarity reference
standard defined for pairs of images on a 25-images dataset, and evaluation
relative to the diagnoses of the retrieved images on a 72-images dataset. A
normalized discounted cumulative gain (NDCG) score of more than 0.92 was obtained
with the first protocol, while AUC scores of more than 0.77 were obtained with
the second protocol. This automatical approach could provide real-time decision
support to radiologists by showing them similar images with associated diagnoses
and, where available, responses to therapies.
|*Semantics
[MESH]
|*Tomography, X-Ray Computed
[MESH]
|Algorithms
[MESH]
|Humans
[MESH]
|Imaging, Three-Dimensional
[MESH]
|Information Storage and Retrieval/*methods
[MESH]