title: Relations between radiograph texture analysis and microcomputed tomography in two rat models of bone metastases.
abstract: OBJECTIVE
  Osteolytic (Walker 256, W256) and osteoblastic (MatLyLu, MLL) metastases were induced to investigate their effect on bone architecture by microcomputed tomography (microCT) and texture analysis of radiographs.
  
  
  METHODS
  Fischer and Copenhagen rats received an intracardiac injection with W256/MLL cells, respectively. Femur and tibia radiographs were analyzed by texture analysis with run lengths and fractal algorithms. Microarchitecture was analyzed on primary and secondary spongiosa by microCT.
  
  
  RESULTS
  W256 and MLL induced a decrease of trabecular bone mass, a disconnection of trabeculae and an increased conversion of plates into pillars. On radiographs and 3-dimensional models of W256 rats, a disappearance of the primary spongiosa was observed. On radiographs and 3-dimensional models of MLL rats, osteolytic lesions were observed as disseminated dark areas. Run length and fractal analyses were altered in both metastases.
  
  
  CONCLUSIONS
  W256 and MLL cells induced two different patterns of osteolysis. Texture analysis of radiographs is a useful technique to explore trabecular bone changes.
authors.affiliation: INSERM, EMI 0335, LHEA, Faculté de Médecine, Angers, France.
authors.forename: S
authors.initials: S
authors.lastname: Blouin
authors.forename: M F
authors.initials: MF
authors.lastname: Moreau
authors.forename: M F
authors.initials: MF
authors.lastname: Baslé
authors.forename: D
authors.initials: D
authors.lastname: Chappard
mesh_terms: D000818:Animals; D001859:Bone Neoplasms / Q000000981:diagnostic imaging* / Q000556:secondary; D001842:Bone and Bones / Q000000981:diagnostic imaging* / Q000473:pathology; D002279:Carcinoma 256, Walker / Q000000981:diagnostic imaging / Q000473:pathology; D005269:Femur / Q000000981:diagnostic imaging / Q000473:pathology; D008297:Male; D009368:Neoplasm Transplantation; D010014:Osteolysis / Q000000981:diagnostic imaging / Q000473:pathology; D011471:Prostatic Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D011897:Random Allocation; D051381:Rats; D011916:Rats, Inbred F344; D013977:Tibia / Q000000981:diagnostic imaging / Q000473:pathology; D014057:Tomography, X-Ray Computed / Q000379:methods