A new anisotropy index on trabecular bone radiographic images using the fast Fourier transform

Autor: Claude Laurent Benhamou, Rachid Harba, Gérald Lemineur, Barbara Brunet-Imbault, Christine Chappard
Přispěvatelé: Maylin, Françoise, Caractérisation du tissu osseux par imagerie : techniques et applications, Université d'Orléans (UO)-Centre Hospitalier Régional d'Orléans (CHRO)-Institut National de la Santé et de la Recherche Médicale (INSERM), Laboratoire d'Electronique, Signaux, Images, Université d'Orléans (UO)
Jazyk: angličtina
Rok vydání: 2005
Předmět:
Pathology
medicine.medical_specialty
[SDV.BIO]Life Sciences [q-bio]/Biotechnology
lcsh:Medical technology
Radiography
Fast Fourier transform
030209 endocrinology & metabolism
03 medical and health sciences
0302 clinical medicine
Nuclear magnetic resonance
Region of interest
medicine
Radiology
Nuclear Medicine and imaging
Anisotropy
030304 developmental biology
Femoral neck
[SDV.IB] Life Sciences [q-bio]/Bioengineering
0303 health sciences
Reproducibility
[SDV.MHEP.RSOA] Life Sciences [q-bio]/Human health and pathology/Rhumatology and musculoskeletal system
business.industry
Isotropy
[SDV.BIO] Life Sciences [q-bio]/Biotechnology
medicine.anatomical_structure
[SDV.MHEP.RSOA]Life Sciences [q-bio]/Human health and pathology/Rhumatology and musculoskeletal system
lcsh:R855-855.5
Radiology Nuclear Medicine and imaging
[SDV.IB]Life Sciences [q-bio]/Bioengineering
Calcaneus
business
Research Article
Zdroj: BMC Medical Imaging, Vol 5, Iss 1, p 4 (2005)
BMC Medical Imaging
BMC Medical Imaging, BioMed Central, 2005, 5, pp.4. ⟨10.1186/1471-2342-5-4⟩
ISSN: 1471-2342
DOI: 10.1186/1471-2342-5-4⟩
Popis: Background The degree of anisotropy (DA) on radiographs is related to bone structure, we present a new index to assess DA. Methods In a region of interest from calcaneus radiographs, we applied a Fast Fourier Transform (FFT). All the FFT spectra involve the horizontal and vertical components corresponding respectively to longitudinal and transversal trabeculae. By visual inspection, we measured the spreading angles: Dispersion Longitudinal Index (DLI) and Dispersion Transverse Index (DTI) and calculated DA = 180/(DLI+DTI). To test the reliability of DA assessment, we synthesized images simulating radiological projections of periodic structures with elements more or less disoriented. Results Firstly, we tested synthetic images which comprised a large variety of structures from highly anisotropic structure to the almost isotropic, DA was ranging from 1.3 to 3.8 respectively. The analysis of the FFT spectra was performed by two observers, the Coefficients of Variation were 1.5% and 3.1 % for intra-and inter-observer reproducibility, respectively. In 22 post-menopausal women with osteoporotic fracture cases and 44 age-matched controls, DA values were respectively 1.87 ± 0.15 versus 1.72 ± 0.18 (p = 0.001). From the ROC analysis, the Area Under Curve (AUC) were respectively 0.65, 0.62, 0.64, 0.77 for lumbar spine, femoral neck, total femoral BMD and DA. Conclusion The highest DA values in fracture cases suggest that the structure is more anisotropic in osteoporosis due to preferential deletion of trabeculae in some directions.
Databáze: OpenAIRE
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