title: MR microimaging of articular cartilage and contrast enhancement by manganese ions.
abstract: Saline solutions of manganese ions (Mn2+) were used as articular contrast agents in magnetic resonance microscopy (9.4 T) of cartilage of chicken femoral condyles and pig temporomandibular joints. The diffusion of Mn2+ from the articular surface into the cartilage matrix led to a strong contrast enhancement in the cartilage. The combination of the high spatial resolution and the contrast enhancement allowed the visualization of fine structures (tissue types) in the cartilage, which correlate with the tissue zones in histological sections stained with cationic dyes. We assume that the electrostatic interactions between the negatively charged groups of the proteoglycans and Mn2+ are most important for the mechanism of contrast enhancement. Hence, the different signal intensities of the various zones of cartilage indicate differences in density of proteoglycans. The intraarticular injection of the cationic contrast agent could improve the possibility of an early diagnosis of cartilage dysfunction and degeneration.
authors.affiliation: Hauptabteilung Medizintechnik, Fraunhofer-Institut für zerstörungsfreie Prüfverfahren, St. Ingbert, Germany.
authors.forename: Y
authors.initials: Y
authors.lastname: Kusaka
authors.forename: W
authors.initials: W
authors.lastname: Gründer
authors.forename: H
authors.initials: H
authors.lastname: Rumpel
authors.forename: K H
authors.initials: KH
authors.lastname: Dannhauer
authors.forename: K
authors.initials: K
authors.lastname: Gersonde
mesh_terms: D000818:Animals; D001842:Bone and Bones / Q000033:anatomy & histology / Q000378:metabolism; D002358:Cartilage, Articular / Q000033:anatomy & histology* / Q000378:metabolism; D002645:Chickens; D003287:Contrast Media; D005269:Femur; D005682:Gadolinium; D019786:Gadolinium DTPA; D006132:Growth Plate / Q000033:anatomy & histology / Q000378:metabolism; D007089:Image Enhancement / Q000379:methods*; D007719:Knee Joint; D008279:Magnetic Resonance Imaging / Q000379:methods*; D009682:Magnetic Resonance Spectroscopy; D008345:Manganese; D017895:Manganese Compounds; D009942:Organometallic Compounds; D004369:Pentetic Acid; D011509:Proteoglycans / Q000493:pharmacokinetics; D013431:Sulfates; D013552:Swine; D013704:Temporomandibular Joint
chemical_list: D003287:Contrast Media; D017895:Manganese Compounds; D009942:Organometallic Compounds; D011509:Proteoglycans; D013431:Sulfates; D008345:Manganese; D004369:Pentetic Acid; D005682:Gadolinium; D019786:Gadolinium DTPA; C039798:manganese sulfate