Discordance of motion artifacts on magnetic resonance imaging in Creutzfeldt-Jakob disease: comparison of diffusion-weighted and conventional imaging sequences

Purpose. Motion artifact is problematic in the diagnosis of Creutzfeldt-Jakob disease (CJD) because of dementia. The purpose was to compare the occurrence of this artifact between a diffusion-weighted (DW) magnetic resonance ( MR) imaging sequence and conventional sequences. Materials and methods. Ten MR examinations comprising T2- weighted, T1- weighted, DW, and fl uidattenuated inversion recovery imaging in seven CJD patients were retrospectively evaluated. The occurrence of motion artifacts on each sequence were assessed, and the examination was classifi ed into four groups as follows: group A, motion artifact not revealed on DW imaging but revealed on one or more other sequences; group B, revealed on DW imaging and one or more other sequences; group C, not revealed on any sequences; and group D, revealed on DW imaging but not on any other sequences. Results. The 10 MR examinations were classifi ed as eight group A ( 80%), one B ( 10%), one C ( 10%), and zero D ( 0%). Conclusion. Motion artifacts are likely to occur in any conventional imaging sequences in CJD, but the fastimaging ability of DW imaging can reduce this artifact. The combination of an absence of motion artifact on DW imaging and the presence on conventional sequences may be one of the frequent fi ndings of CJD.