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Fig. 5 | BioMedical Engineering OnLine

Fig. 5

From: Respiratory motion correction of PET using MR-constrained PET-PET registration

Fig. 5

The effects of motion correction on large lesions in positions 2, 5, and 8 in coronal views of volunteer 4. Refer to Fig. 3 for lesion positions. Effects are shown for the uncorrected PET (UC), the indirect correspondence model proposed in this paper (IC), the direct correspondence method from [29] (DC), unconstrained PET-PET registration (PT) and the gold-standard set by motionless PET (ML). Note that L2 does not move much. This agrees with the observation reported by [3] that lesions in the upper lung move by around \(2\,\mathrm {mm}\): below PET image resolution. However, L5 and L8 have lost contrast due to respiratory motion, which is recovered with varying success by correction methods IC, DC and PT. Profiles of these lesions are displayed in Fig. 6

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