PET motion correction using MR-derived motion parameters

Bickell, Matthew; Koesters, Thomas; Boada, Fernando E.

doi:10.1186/2197-7364-1-s1-a53

Cited by 2 publications

(3 citation statements)

References 4 publications

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“…Previous studies that have used MRI based approaches for motion correction in hybrid PET/MRI of the brain were also successful in correcting the PET data (Catana et al 2011, Bickell et al 2014, Huang et al 2014b, Chen et al 2018. These applications however used the MRI solely for the purposes of motion correction and did not acquire any diagnostic MR images.…”

Section: Discussionmentioning

confidence: 99%

“…While successful at respiratory motion correction, these techniques are not suitable for the spontaneous and unpredictable motion that can occur during head imaging. Previous studies which have successfully developed MRI based motion correction techniques for brain PET using navigators (Catana et al 2011), image registration (Bickell et al 2014, Chen et al 2018 and active markers (Huang et al 2014a), used the MRI solely for motion correction and did not acquire diagnostic MRI images simultaneously with the PET.…”

Section: Introductionmentioning

confidence: 99%

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Rigid-body motion correction in hybrid PET/MRI using spherical navigator echoes

et al. 2019

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Integrated positron emission tomography and magnetic resonance imaging (PET/MRI) is an imaging technology that provides complementary anatomical and functional information for medical diagnostics. Both PET and MRI are highly susceptible to motion artifacts due, in part, to long acquisition times. The simultaneous acquisition of the two modalities presents the opportunity to use MRI navigator techniques for motion correction of both PET and MRI data. For this task, we propose spherical navigator echoes (SNAVs)—3D k-space navigators that can accurately and rapidly measure rigid body motion in all six degrees of freedom. SNAVs were incorporated into turbo FLASH (tfl)—a product fast gradient echo sequence—to create the tfl-SNAV pulse sequence. Acquiring in vivo brain images from a healthy volunteer with both sequences first compared the tfl-SNAV and product tfl sequences. It was observed that incorporation of the SNAVs into the image sequence did not have any detrimental impact on the image quality. The SNAV motion correction technique was evaluated using an anthropomorphic brain phantom. Following a stationary reference image where the tfl-SNAV sequence was acquired along with simultaneous list-mode PET, three identical PET/MRI scans were performed where the phantom was moved several times throughout each acquisition. This motion—up to 11° and 14 mm—resulted in motion artifacts in both PET and MR images. Following SNAV motion correction of the MRI and PET list-mode data, artifact reduction was achieved for both the PET and MR images in all three motion trials. The corrected images have improved image quality and are quantitatively more similar to the ground truth reference images.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rigid-body motion correction in hybrid PET/MRI using spherical navigator echoes

et al. 2019

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“…PET-MR is a hybrid imaging modality that has generated substantial interest in recent years. This marriage of two modalities with very different physics allows the development of many novel synergistic techniques and applications including MR-assisted PET motion correction (Bickell et al 2014, Fayad et al 2014, Polycarpou et al 2014, Fürst et al 2015, MR-assisted partial volume correction (Wang and Fei 2012, Bickell et al 2014, Yan et al 2015, PET guided MR spectroscopy (Zhang et al 2014), and PET-MR joint reconstruction (Knoll et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Continuous MR bone density measurement using water- and fat-suppressed projection imaging (WASPI) for PET attenuation correction in PET-MR

et al. 2015

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Due to the lack of signal from solid bone in normal MR sequences for the purpose of MR-based attenuation correction, investigators have proposed using the ultrashort echo time (UTE) pulse sequence, which yields signal from bone. However, UTE-based segmentation approach might not fully capture the intra- and inter-subject bone density variation, which will inevitably lead to bias in reconstructed PET images. In this work, we investigated using the Water- And fat-Suppressed proton Projection Imaging (WASPI) sequence to obtain accurate and continuous attenuation for the bones. This approach is capable to account for intra- and inter-subject bone attenuation variations. Using data acquired from a phantom, we have found that that attenuation correction based on WASPI sequence is more accurate and precise when compared to either conventional MR attenuation correction or UTE based segmentation approaches.

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PET motion correction using MR-derived motion parameters

Cited by 2 publications

References 4 publications

Rigid-body motion correction in hybrid PET/MRI using spherical navigator echoes

Rigid-body motion correction in hybrid PET/MRI using spherical navigator echoes

Continuous MR bone density measurement using water- and fat-suppressed projection imaging (WASPI) for PET attenuation correction in PET-MR

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