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Abstract #5103

DIR Imaging Using GRAPPA for Cortical Thickness Estimation

Narae Choi1, Yoonho Nam1, Dong-Hyun Kim1,2

1Electrical and Electronic Engineering, Yonsei University, Sinchon dong, Seoul, Korea, Republic of; 2Radiology, Yonsei University, Sinchon dong, Seoul, Korea, Republic of

Most gray matter volumetric studies use T1-weighted imaging such as MP-RAGE because it provides good contrast between white matter and cortex. However, due to susceptibility artifact coming from the air-tissue interface, a reliable and accurate measurement is difficult in the regions near the air-bone interface for T1-wieghted schemes. One way to alleviate this problem is to perform gray matter spin-echo imaging through DIR sequence. One drawback of the DIR sequence, however, is its long scan time. We applied one of the parallel imaging reconstruction schemes, GRAPPA scheme, to DIR imaging to evaluate measurement changes as a function of reduction factor.