A biexponential DWI study in rat brain intracellular oedema

Steier, Roy and Aradi, Mihály and Pál, József and Perlaki, Gábor and Orsi, Gergely and Bogner, Péter and Gallyas, Ferenc and Bukovics, Péter and Janszky, József and Dóczi, Tamás and Schwarcz, Attila (2011) A biexponential DWI study in rat brain intracellular oedema. European Journal of Radiology.

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Abstract

Purpose: To examinethechangesinMRparametersderivedfromdiffusionweightedimaging(DWI) biexponential analysisinaninvivointracellularbrainoedemamodel,andtoapplyelectronmicroscopy (EM) toshedmorelightonthemorphologicalbackgroundofMR-relatedobservations. Materials andmethods: Intracellular oedemawasinducedintenmaleWistarrats(380–450g)bywayof water load,usinga20%bodyweightintraperitonealinjectionof140mmol/Ldextrosesolution.A3TMRI instrument wasusedtoperformserialDWI,andMRspecroscopy(watersignal)measurements.Following the MRexaminationthebrainsoftheanimalswereanalyzedforEM. Results: Following thewaterloadinduction,apparentdiffusioncoefficient(ADC)valuesstarteddeclining from 724±43�m2/s to682±26�m2/s (p < 0.0001). ADC-fast valuesdroppedfrom948±122 to840±66�m2/s (p < 0.001).ADC-slowshowedadecrease from 226±66 to191±74�m2/s (p < 0.05). There wasashiftfromtheslowtothefastcomponentat110mintimepoint.Thepercentageofthefast component demonstratedmoderate,yetsignificantincreasefrom76.56±7.79% to81.2±7.47% (p < 0.05). The watersignalwasincreasingby4.98±3.52% comparedtothebaseline(p < 0.01). The resultsoftheE.M.revealedthatwaterwasdetectedintracellularly,withinastrocyticpreivascular end-feet andcellbodies. Conclusion: The unexpectedvolumefractionchanges(i.e.increaseinfastcomponent)detectedinhypo- tonic oedemaappeartobesubstantiallydifferentfromthoseobservedinstroke.ItmaysuggestthatADC decrease instroke,incontrasttogeneralpresumptions,cannotbeexplainedonlybywatershiftfrom extra tointracellularspace(i.e.intracellularoedema).

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