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jim.voyvodic Posted - Sep 22 2003 : 09:13:21 AM
As promised, we have switched the audio headphones between the 1.5T and 4T BIAC scanners (effective 9/21/03). Both headphones provide loud high quality sound. The headphones on the 4T are now the pneumatic set with no electrical components in the headset itself. The headphones on the 1.5T have the electrical speakers within the headset. The frequency response of the electrical set is somewhat better than for the pneumatic set. At 4T the electrical headphones produce a slight MR image artifact in functional imaging on phantoms, although this is not detectable on human subjects (because of the susceptibility artifacts already present at the ear canal). With the current setup we should have very good sound quality on both scanners and no imaging artifacts at all.

Jim

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