Image quality in CT perfusion imaging of the brain. The role of iodine concentration.
The purpose of this study was to evaluate the impact of various iodine contrast concentrations on image quality in computed tomography (CT) perfusion studies. Twenty-one patients with suspicion of cerebral ischemia underwent perfusion CT using two different iodine contrast concentrations: 11 patients received iomeprol 300 (iodine concentration: 300 mg/ml ) while ten received the same volume of iomeprol 400 (iodine concentration: 400 mg/ml). Scan parameters were kept constant for both groups. Maps of cerebral blood flow (CBF), cerebral blood volume (CBV), and time to peak (TTP) were calculated from two adjacent slices. Quantitative comparisons were based on measurements of the maximum enhancement [Hounsfield units (HU)] and signal-to-noise index (SNI) on CBF, CBV, and TTP images. Determinations of grey-to-white-matter delineation for each iodine concentration were performed by two blinded readers. Only data from the non-ischemic hemispheres were considered. Both maximum enhancement and SNI values were higher after iomeprol 400, resulting in significantly better image quality in areas of low perfusion. No noteworthy differences were found for normal values of CBF, CBV, and TTP. Qualitative assessment of grey/white matter contrast on CBF and CBV maps revealed better performance for iomeprol 400. For brain perfusion studies, highly concentrated contrast media such as iomeprol 400 is superior to iomeprol 300.
König
Matthias
M
Department of Diagnostic and Interventional Radiology and Nuclear Medicine, Ruhr-University Bochum, Knappschaftskrankenhaus Langendreer, In der Schornau 23-25, 44892 Bochum, Germany. matthias.koenig@ruhr-uni-bochum.de
Bültmann
Eva
E
Bode-Schnurbus
Lucas
L
Koenen
Dirk
D
Mielke
Eckhart
E
Heuser
Lothar
L
D002545:Brain Ischemia / Q000000981:diagnostic imaging*; D002560:Cerebrovascular Circulation; D003287:Contrast Media / Q000008:administration & dosage*; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D007479:Iopamidol / Q000008:administration & dosage / Q000031:analogs & derivatives*; D008297:Male; D008875:Middle Aged; D014057:Tomography, X-Ray Computed
D003287:Contrast Media; C057937:iomeprol; D007479:Iopamidol