Renal Safety of CT Angiography and Perfusion Imaging in the Emergency Evaluation of Acute Stroke ● J.J. Hopyan, D.J. Gladstone, G. Mallia, J. Schiff, A.J. Fox, S.P. Symons, B.H. Buck, S.E. Black, and R.I. Aviv
http://www.ajnr.org/cgi/content/full/29/10/1826
With increasing usage of CT in the Emergency Department to image patients suspected of having an acute cerebral infarction a bigger quantity of iodinated contrast material is being used. This is particularly true when CTA and followed by CT perfusion. In this article the authors examined serial creatinine serum levels in 198 such patients. They found that contrast-induced nephropathy developed in only 2% of their patients and concluded a repeat dose of contrast is safe in most patients being imaged for acute stroke.
Patterns of Brain Activation during Visually Evoked Sexual Arousal Differ between Homosexual and Heterosexual Men ● S.-h. Hu, N. Wei, Q.-D. Wang, L.-q. Yan, E.-Q. Wei, M.-M. Zhang, J.-B. Hu, M.-l. Huang, W.-h. Zhou, andY. Xu
http://www.ajnr.org/cgi/content/full/29/10/1890
This article will certainly be controversial! Differences in the way the brain works between heterosexual and homosexual males are mostly unknown. Here the authors study patterns of brain activation in both male groups during visually evoked sexual arousal. Both groups were shown heterosexual, male homosexual, and female homosexual movies and were also asked to grade their degree of sexual arousal. They authors found that different neural circuits were active in both groups.
Collateral Circulation Imaging: MR Perfusion Territory Arterial Spin-Labeling at 3T ● B. Wu, X. Wang, J. Guo, S. Xie, E.C. Wong, J. Zhang, X. Jiang, and J. Fang
http://www.ajnr.org/cgi/content/full/29/10/1855
Collateral arterial brain circulation plays an important role particularly in disease states but little is known about it and evaluating it is difficult. The authors used 3T ASL MR perfusion to assess patients with known ICA or MCA stenoses and color-coded the different circulation territories. Their technique was able to show collaterals not only through the circle of Willis but leptomeningeal too. They concluded that vessel-encoded ASL perfusion shows the presence, the origin and distal function of cerebral collateral flow.
