LAUSR

BACKGROUND A touchscreen interface permits rich user interactions for research in many fields, but is rarely found within a Magnetic Resonance Imaging (MRI) environment due to difficulties adapting conventional technologies to the strong electromagnetic fields. Conventional MR-compatible video display technology uses either large-screen displays that are placed outside of the bore of the MRI itself, or projectors located beyond the participant's reach, making touch interfaces impossible. NEW METHOD Here, we describe the MR-compatibility of the 'MRItab' in terms of MR safety and image quality. The MRItab adapts inexpensive off-the-shelf components with special signal-driver circuitry and shielding to bring the touchscreen interface into the MR environment, without adversely affecting MRI image quality, thereby making touch interfaces possible. RESULTS Our testing demonstrated that the functioning of the MRItab was not affected by the functioning of the MRI scanner and that the MRItab did not adversely affect the image data acquired. Participants were able to interact naturally with the MRItab during MRI scanning. COMPARISON WITH OTHER METHOD (S) The MRItab is the first MR-compatible touchscreen device with video-display screen capabilities designed for use in the MRI environment. This interactive digital device is the first to allow participants to see their hands directly as they interact with a touch-sensitive display screen, resulting in high ecological validity. CONCLUSIONS The MRItab provides a methodological advantage for research in many fields, given the realistic human-computer interaction it supports.