title: [Fast MRI contrast medium dynamics for characterization of tumors. Experiences with functional MR-mammography].
abstract: METHODS
  MRI studies with high temporal resolution can be achieved with an optimized saturation recovery TurboFLASH sequence, which allows a more detailed characterization of contrast enhancement in tissue as is available with the current FLASH 3D techniques. A two compartment model allows characterization of signal time curves with three parameters, Amp (amplitude), k21 (distribution rate constant) and kel (elimination rate constant).
  
  
  RESULTS
  In a prospective study on 314 patients with indetermined breast lesions signal-time-curves revealed differences in the k21 parameter between benign (0.56 +/- 0.46) and malignant lesions (1.25 +/- 0.80) (p < 0.0001) as well as between different histological classifications.
  
  
  CONCLUSIONS
  The introduced MR-technique enables a better evaluation of the vascular permeability for the MR contrast media in lesions. Distinct differences were detected, which are influenced by elevated expression of angiogenesis factors such as the vascular endothelial growth factor.
authors.affiliation: Forschungsschwerpunkt Radiologische Diagnostik und Therapie, Deutsches Krebsforschungszentrum Heidelberg.
authors.forename: M V
authors.initials: MV
authors.lastname: Knopp
authors.forename: U
authors.initials: U
authors.lastname: Hoffmann
authors.forename: G
authors.initials: G
authors.lastname: Brix
authors.forename: H
authors.initials: H
authors.lastname: Hawighorst
authors.forename: H J
authors.initials: HJ
authors.lastname: Junkermann
authors.forename: G
authors.initials: G
authors.lastname: van Kaick
mesh_terms: D001940:Breast / Q000098:blood supply / Q000473:pathology; D001943:Breast Neoplasms / Q000098:blood supply / Q000175:diagnosis*; D018270:Carcinoma, Ductal, Breast / Q000098:blood supply / Q000175:diagnosis; D002285:Carcinoma, Intraductal, Noninfiltrating / Q000098:blood supply / Q000175:diagnosis; D018275:Carcinoma, Lobular / Q000098:blood supply / Q000175:diagnosis; D005260:Female; D006801:Humans; D007089:Image Enhancement / Q000295:instrumentation*; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation*; D008279:Magnetic Resonance Imaging / Q000295:instrumentation*; D009389:Neovascularization, Pathologic / Q000175:diagnosis; D011446:Prospective Studies; D012039:Regional Blood Flow / Q000502:physiology; D015203:Reproducibility of Results