!! MRI Part3 アーチファクトの ... - kanamri.umin.ne.jp

1 !! MRI Part3 2014 2 7 26 MRI (motion artifact) chemical shift artifact (magnetic susceptibility artifact) truncation artifact aliasing artifact (zipper artifact) (crosstalk artifact) H-MRS MRI MRI ppm ppm parts per million 100 1 100 B MHz/T B MHz/T T 10 224Hz MHz

2 10 MHz 10 149Hz 224Hz 447Hz 1 32kHz/256 125Hz/pix 125Hz 224Hz 224Hz/125Hz 256 32kHz 1 125Hz/pix 149Hz 125Hx/pix 224Hz 125Hx/pix 447Hz 125Hx/pix Hz 16kHz 1 125Hz/pix FOV128mm SE TR500 TE14 BW 50Hz/pix BW 98Hz/pix BW 150Hz/pix BW 25kHz 195Hz/pix BW 50kHz 391Hz/pix FOV128mm SE TR500 TE14 BW 50Hz/pix BW 98Hz/pix BW 150Hz/pix BW 25kHz 195Hz/pix BW 50kHz 391Hz/pix BW 279Hz/pix 2 2 In phase opposed phase 0msec 224Hz 1/224Hz 2 TE TE magnetic Susceptibility 3

3 RF A B A B A B A B A A B A B A B EPI 1 2 SE TR 3000 TE 78 SE SE GRE EPI SE SE GRE EPI GE SE GRE EPI BW 50Hz/pix BW 100Hz/pix BW 200Hz/pix BW 800Hz/pix TR3000 TE100 ETL16 EPI SE Single-shot EPI 3 2 1 1 GRE T2* T2

4 SWI SIEMENS SWAN GE 2 MRI MRI MRI MRI MRI MRI