Proton density (PD) weighted Zero TE (ZTE) MR imaging has been demonstrated to provide accurate bone depiction, segmentation and pseudo CT conversion in the head. However, when applied for the whole-body, discriminating between air and bone appears challenging (primarily because of SNR and RF shading). Here we present a novel method for decomposition of low ZTE signal intensity regions into bone and air based on connected component and shape analysis. The method is demonstrated for whole-body, pseudo CT conversion in three PET/MR patients.
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