A quantification strategy for missing bone mass in case of osteolytic bone lesions

Purpose: Most of the patients who died of breast cancer have developed bone metastases. To understand the pathogenesis of bone metastases and to analyze treatment response of different bone remodeling therapies, preclinical animal models are examined. In breast cancer, bone metastases are often bone...

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Hauptverfasser: Fränzle, Andrea (VerfasserIn) , Bretschi, Maren (VerfasserIn) , Bäuerle, Tobias (VerfasserIn) , Giske, Kristina (VerfasserIn) , Hillengaß, Jens (VerfasserIn) , Bendl, Rolf (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 11 November 2013
In: Medical physics
Year: 2013, Jahrgang: 40, Heft: 12, Pages: 123501-1-123501-8
ISSN:2473-4209
DOI:10.1118/1.4828843
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1118/1.4828843
Verlag, lizenzpflichtig, Volltext: https://doi.org/https://doi.org/10.1118/1.4828843
Verlag, lizenzpflichtig, Volltext: https://aapm.onlinelibrary.wiley.com/doi/abs/10.1118/1.4828843
Volltext
Verfasserangaben:Andrea Fränzle, Maren Bretschi and Tobias Bäuerle, Kristina Giske, Jens Hillengass, Rolf Bendl

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520 |a Purpose: Most of the patients who died of breast cancer have developed bone metastases. To understand the pathogenesis of bone metastases and to analyze treatment response of different bone remodeling therapies, preclinical animal models are examined. In breast cancer, bone metastases are often bone destructive. To assess treatment response of bone remodeling therapies, the volumes of these lesions have to be determined during the therapy process. The manual delineation of missing structures, especially if large parts are missing, is very time-consuming and not reproducible. Reproducibility is highly important to have comparable results during the therapy process. Therefore, a computerized approach is needed. Also for the preclinical research, a reproducible measurement of the lesions is essential. Here, the authors present an automated segmentation method for the measurement of missing bone mass in a preclinical rat model with bone metastases in the hind leg bones based on 3D CT scans. Methods: The affected bone structure is compared to a healthy model. Since in this preclinical rat trial the metastasis only occurs on the right hind legs, which is assured by using vessel clips, the authors use the left body side as a healthy model. The left femur is segmented with a statistical shape model which is initialised using the automatically segmented medullary cavity. The left tibia and fibula are segmented using volume growing starting at the tibia medullary cavity and stopping at the femur boundary. Masked images of both segmentations are mirrored along the median plane and transferred manually to the position of the affected bone by rigid registration. Affected bone and healthy model are compared based on their gray values. If the gray value of a voxel indicates bone mass in the healthy model and no bone in the affected bone, this voxel is considered to be osteolytic. Results: The lesion segmentations complete the missing bone structures in a reasonable way. The mean ratiovr/vm of the reconstructed bone volume vr and the healthy model bone volume vm is 1.07, which indicates a good reconstruction of the modified bone. Conclusions: The qualitative and quantitative comparison of manual and semi-automated segmentation results have shown that comparing a modified bone structure with a healthy model can be used to identify and measure missing bone mass in a reproducible way. 
650 4 |a Acceleration measurement 
650 4 |a Analysing materials by determining density or specific gravity 
650 4 |a Biological material 
650 4 |a Biomedical modeling 
650 4 |a bone 
650 4 |a bone metastasis 
650 4 |a Cancer 
650 4 |a Computed tomography 
650 4 |a Computer modeling 
650 4 |a Computer software 
650 4 |a Computerised tomographs 
650 4 |a computerised tomography 
650 4 |a Decision trees 
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650 4 |a image reconstruction 
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650 4 |a in general 
650 4 |a Investigating density or specific gravity of materials 
650 4 |a mass measurement 
650 4 |a Mass measurement 
650 4 |a medical image processing 
650 4 |a Medical image segmentation 
650 4 |a Medical imaging 
650 4 |a osteolytic lesions 
650 4 |a physiological models 
650 4 |a preclinical animal model 
650 4 |a Reconstruction 
650 4 |a Registration 
650 4 |a segmentation 
650 4 |a Segmentation 
650 4 |a specially adapted for specific applications 
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