Abstract #1835

Two NSA or not two NSA: does perforator artery detection in white matter benefit from signal averaging?

Lennart Geurts¹, Sander Brinkhof¹, Peter R. Luijten¹, and Jaco J.M. Zwanenburg¹

¹Radiology, UMCU, Utrecht, Netherlands

Because cerebral perforating arteries have sub-millimeter diameters and slow blood flow velocities, their blood flow velocity and pulsatility measurements are challenging and limited by noise and partial volume effects. Our previously reported acquisition method used two signal averages (NSA) to increase the signal-to-noise ratio (SNR). We show that decreasing NSA, and thereby reducing scan time by half, has little effect on vessel detection. The NSA=1 coefficients of repeatability (CoR) found in this study are similar to previously published NSA=2 CoR`s. Subject motion and small vessel size likely play together to cause a sub-optimal benefit from increased imaging time.

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