PT - JOURNAL ARTICLE AU - S. Haller TI - The Concept of “Number Needed to Image” AID - 10.3174/ajnr.A5276 DP - 2017 Jun 15 TA - American Journal of Neuroradiology 4099 - http://www.ajnr.org/content/early/2017/06/15/ajnr.A5276.short 4100 - http://www.ajnr.org/content/early/2017/06/15/ajnr.A5276.full