Characterization of hardware-related spatial distortions for IR-PETRA pulse sequence using a brain specific phantom





Inversion recovery-pointwise encoding time reduction with radial acquisition (IR-PETRA) is an effective magnetic resonance (MR) pulse sequence in generating pseudo-CTs. The hardware-related spatial-distortion (HRSD) in MR images potentially deteriorates the accuracy of pseudo-CTs. Thus, we aimed at characterizing HRSD for IR-PETRA.

Materials and methods

gross-HRSDoverall (Euclidean-sum of gross-HRSDi (i = xyz)) for IR-PETRA was assessed using a brain-specific phantom for two MR scanners (1.5 T-Aera and 3.0 T-Prisma). Moreover, hardware imperfections were analyzed by determining gradient-nonlinearity spatial-distortion (GNSD) and B0-inhomogeneity spatial-distortion (B0ISD) for magnetization-prepared rapid acquisition gradient-echo (MP-RAGE) which has well-known distortion characteristics.


In 3.0 T, maximum of gross-GNSDoverall (Euclidean-sum of gross …

s IR-PETRA · Hardware-related spatial distortion · Pseudo-CTs · Brain-specifc phantom

Sima Ahmadian, Iraj Jabbari, Seyed Mehdi Bagherimofidi, Hamidreza Saligheh Rad

Magnetic Resonance Materials in Physics, Biology and Medicine
Scroll to Top