The Problem of Metal Needles in Acupuncture-fMRI Studies

Figure 1

The different acupuncture needles compared in this study: (1) standard acupuncture needle, (2) non-ferromagnetic needle, and (3) modified peripheral I.V. catheter: (a) catheter without mandrin, (b) catheter with mandrin, (c) steel mandrin (to be removed after insertion and before application in MR environment).