2d image navigators (inavs) Search Results


coronal 2d image navigators  (Respiratory Motion)
90
Respiratory Motion coronal 2d image navigators
Coronal 2d Image Navigators, supplied by Respiratory Motion, used in various techniques. Bioz Stars score: 90/100, based on 1 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
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non-rigid respiratory motion-compensated cmra approach  (Respiratory Motion)
90
Respiratory Motion non-rigid respiratory motion-compensated cmra approach
Description of patient studies on plaque imaging with PET/MRI
Non Rigid Respiratory Motion Compensated Cmra Approach, supplied by Respiratory Motion, used in various techniques. Bioz Stars score: 90/100, based on 1 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
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non-rigid respiratory motion-compensated cmra approach - by Bioz Stars, 2026-03
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2d inav  (Respiratory Motion)
90
Respiratory Motion 2d inav
PET and MRI data are acquired simultaneously. The <t>2D</t> <t>iNAV</t> is only available for part of the complete examination (i.e. during the CMRA acquisition). The feet-head (FH) motion signal is derived from the iNAV to generate the iNAV respiratory signal. The different colors (green, black, red, and cyan) each represent the bin in which the data acquired during this time window will be allocated. The breathing signal from the respiratory belt (thoracic motion) is available for the entire duration of the scan. By co-registration of the iNAV and belt respiratory signal in the period in which they are acquired simultaneously, the respiratory signal in the entire time period can be used to bin the PET data of the entire PET examination. The µ-map is deformed using the inverse motions fields to match the position of each bin. The deformed µ-map is used to reconstruct PET data for each bin. Next, these PET images are transformed to the end-expiration position using the motion fields again and combined to create the final motion-corrected PET image
2d Inav, supplied by Respiratory Motion, used in various techniques. Bioz Stars score: 90/100, based on 1 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
https://www.bioz.com/result/2d inav/product/Respiratory Motion
Average 90 stars, based on 1 article reviews
2d inav - by Bioz Stars, 2026-03
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sagittal and coronal 2d inavs  (Respiratory Motion)
90
Respiratory Motion sagittal and coronal 2d inavs
Cardiac-triggered 3D cones acquisition scheme. (a) 3D cones data acquisition is preceded by a spiral sagittal iNAV acquisition and fat suppression module. 3D cones interleaves are acquired using an ATR-SSFP readout for additional fat suppression. Multiple imaging phases are acquired during the 3D cones data acquisition period. A spiral coronal iNAV acquisition immediately follows the cones data acquisition. Representative sagittal (b) and coronal (c) <t>iNAVs</t> acquired during one heartbeat of a volunteer study are shown.
Sagittal And Coronal 2d Inavs, supplied by Respiratory Motion, used in various techniques. Bioz Stars score: 90/100, based on 1 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
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Image Search Results


Description of patient studies on plaque imaging with PET/MRI

Journal: Cardiovascular Diagnosis and Therapy

Article Title: PET/MRI of atherosclerosis

doi: 10.21037/cdt.2020.02.09

Figure Lengend Snippet: Description of patient studies on plaque imaging with PET/MRI

Article Snippet: Munoz et al. ( 94 ) utilized a non-rigid respiratory motion-compensated CMRA approach (based on 2D iNAV for respiratory binning) to correct for respiratory motion induced cardiac motion in the simultaneously acquired PET and MR data.

Techniques: Imaging, Functional Assay, Activity Assay, Expressing, Derivative Assay

PET and MRI data are acquired simultaneously. The 2D iNAV is only available for part of the complete examination (i.e. during the CMRA acquisition). The feet-head (FH) motion signal is derived from the iNAV to generate the iNAV respiratory signal. The different colors (green, black, red, and cyan) each represent the bin in which the data acquired during this time window will be allocated. The breathing signal from the respiratory belt (thoracic motion) is available for the entire duration of the scan. By co-registration of the iNAV and belt respiratory signal in the period in which they are acquired simultaneously, the respiratory signal in the entire time period can be used to bin the PET data of the entire PET examination. The µ-map is deformed using the inverse motions fields to match the position of each bin. The deformed µ-map is used to reconstruct PET data for each bin. Next, these PET images are transformed to the end-expiration position using the motion fields again and combined to create the final motion-corrected PET image

Journal: EJNMMI Physics

Article Title: Extended MRI-based PET motion correction for cardiac PET/MRI

doi: 10.1186/s40658-024-00637-z

Figure Lengend Snippet: PET and MRI data are acquired simultaneously. The 2D iNAV is only available for part of the complete examination (i.e. during the CMRA acquisition). The feet-head (FH) motion signal is derived from the iNAV to generate the iNAV respiratory signal. The different colors (green, black, red, and cyan) each represent the bin in which the data acquired during this time window will be allocated. The breathing signal from the respiratory belt (thoracic motion) is available for the entire duration of the scan. By co-registration of the iNAV and belt respiratory signal in the period in which they are acquired simultaneously, the respiratory signal in the entire time period can be used to bin the PET data of the entire PET examination. The µ-map is deformed using the inverse motions fields to match the position of each bin. The deformed µ-map is used to reconstruct PET data for each bin. Next, these PET images are transformed to the end-expiration position using the motion fields again and combined to create the final motion-corrected PET image

Article Snippet: A 2D iNAV recorded the respiratory motion of the myocardium during the 3D whole-heart coronary MR angiography (CMRA) acquisition (~ 10 min).

Techniques: Derivative Assay, Transformation Assay

a Feet head motion recorded by the iNAV. b Thoracic motion recorded with the respiratory belt. c Overlapping signal from the iNAV ( a ) and the respiratory belt ( b ). The solid vertical lines represent the R-peak in the ECG signal. The dots on curve in sub-plot a represent the time points at which the iNAV was acquired in the R–R wave. The crosses on curve in sub-plot b represent the corresponding time points signal from the respiratory belt. The shaded horizontal regions in panel a and b represent the 4 bins. All PET data acquired in an R-R interval is allocated to one of the 4 bins. The bin to which the data is allocated is based on the displacement of the heart as determined by the iNAV. For example, in panel a, the data in the first panel is allocated to bin 2 as the iNAV acquired for the R–R interval falls within the bin 2 thresholds. The four colors represent the 4 bins. Red represents bin 1, cyan bin 2, black bin 3 and green bin 4

Journal: EJNMMI Physics

Article Title: Extended MRI-based PET motion correction for cardiac PET/MRI

doi: 10.1186/s40658-024-00637-z

Figure Lengend Snippet: a Feet head motion recorded by the iNAV. b Thoracic motion recorded with the respiratory belt. c Overlapping signal from the iNAV ( a ) and the respiratory belt ( b ). The solid vertical lines represent the R-peak in the ECG signal. The dots on curve in sub-plot a represent the time points at which the iNAV was acquired in the R–R wave. The crosses on curve in sub-plot b represent the corresponding time points signal from the respiratory belt. The shaded horizontal regions in panel a and b represent the 4 bins. All PET data acquired in an R-R interval is allocated to one of the 4 bins. The bin to which the data is allocated is based on the displacement of the heart as determined by the iNAV. For example, in panel a, the data in the first panel is allocated to bin 2 as the iNAV acquired for the R–R interval falls within the bin 2 thresholds. The four colors represent the 4 bins. Red represents bin 1, cyan bin 2, black bin 3 and green bin 4

Article Snippet: A 2D iNAV recorded the respiratory motion of the myocardium during the 3D whole-heart coronary MR angiography (CMRA) acquisition (~ 10 min).

Techniques:

Cardiac-triggered 3D cones acquisition scheme. (a) 3D cones data acquisition is preceded by a spiral sagittal iNAV acquisition and fat suppression module. 3D cones interleaves are acquired using an ATR-SSFP readout for additional fat suppression. Multiple imaging phases are acquired during the 3D cones data acquisition period. A spiral coronal iNAV acquisition immediately follows the cones data acquisition. Representative sagittal (b) and coronal (c) iNAVs acquired during one heartbeat of a volunteer study are shown.

Journal: Magnetic resonance in medicine : official journal of the Society of Magnetic Resonance in Medicine / Society of Magnetic Resonance in Medicine

Article Title: Nonrigid Autofocus Motion Correction for Coronary MR Angiography with a 3D Cones Trajectory

doi: 10.1002/mrm.24924

Figure Lengend Snippet: Cardiac-triggered 3D cones acquisition scheme. (a) 3D cones data acquisition is preceded by a spiral sagittal iNAV acquisition and fat suppression module. 3D cones interleaves are acquired using an ATR-SSFP readout for additional fat suppression. Multiple imaging phases are acquired during the 3D cones data acquisition period. A spiral coronal iNAV acquisition immediately follows the cones data acquisition. Representative sagittal (b) and coronal (c) iNAVs acquired during one heartbeat of a volunteer study are shown.

Article Snippet: To enable the measurement and subsequent correction of superior-inferior (SI), anterior-posterior (AP), and right-left (RL) translation of the heart due to respiratory motion, sagittal and coronal 2D iNAVs are acquired before and after cones data acquisition every heartbeat, respectively.

Techniques: Imaging

Block diagram of the autofocus motion correction algorithm. (a) A normalized mutual information metric is used to estimate SI, AP, and RL displacements from sagittal and coronal iNAVs. (b) A set of motion basis waveforms is constructed by amplitude-scaling the measured SI, AP, and RL displacements. (c) For each set of motion basis waveforms, 3D translational correction is applied in k-space via phase modulation. (d) Motion-compensated images are reconstructed using 3D gridding followed by a 3D FFT. (e) A localized gradient entropy focusing metric is computed for each image. (f) Pixelwise minimization of the focusing metric yields the final image and SI, AP, and RL motion maps.

Journal: Magnetic resonance in medicine : official journal of the Society of Magnetic Resonance in Medicine / Society of Magnetic Resonance in Medicine

Article Title: Nonrigid Autofocus Motion Correction for Coronary MR Angiography with a 3D Cones Trajectory

doi: 10.1002/mrm.24924

Figure Lengend Snippet: Block diagram of the autofocus motion correction algorithm. (a) A normalized mutual information metric is used to estimate SI, AP, and RL displacements from sagittal and coronal iNAVs. (b) A set of motion basis waveforms is constructed by amplitude-scaling the measured SI, AP, and RL displacements. (c) For each set of motion basis waveforms, 3D translational correction is applied in k-space via phase modulation. (d) Motion-compensated images are reconstructed using 3D gridding followed by a 3D FFT. (e) A localized gradient entropy focusing metric is computed for each image. (f) Pixelwise minimization of the focusing metric yields the final image and SI, AP, and RL motion maps.

Article Snippet: To enable the measurement and subsequent correction of superior-inferior (SI), anterior-posterior (AP), and right-left (RL) translation of the heart due to respiratory motion, sagittal and coronal 2D iNAVs are acquired before and after cones data acquisition every heartbeat, respectively.

Techniques: Blocking Assay, Construct

Free-breathing study with resolution phantom. (a) Photograph showing the resolution phantom strapped around the chest of a volunteer. The phantom consisted of five groups of five equally spaced vials, with inner diameters of 6, 4, 2.25, 1.5, and 0.75 mm. (b) An axial slice through the phantom is shown using a static 3D cones acquisition with the phantom strapped around a large doped-water phantom. The inner diameters of each vial are labeled. (c–e) A free-breathing 3D cones acquisition was carried out with the phantom strapped around the chest of a volunteer. An axial slice through the phantom is shown from images reconstructed with (c) no motion correction, (d) rigid-body translational motion correction using SI, AP, and RL trajectories derived from iNAVs located on the volunteer’s heart, and (e) autofocus motion correction using the same iNAV measurements as (d).

Journal: Magnetic resonance in medicine : official journal of the Society of Magnetic Resonance in Medicine / Society of Magnetic Resonance in Medicine

Article Title: Nonrigid Autofocus Motion Correction for Coronary MR Angiography with a 3D Cones Trajectory

doi: 10.1002/mrm.24924

Figure Lengend Snippet: Free-breathing study with resolution phantom. (a) Photograph showing the resolution phantom strapped around the chest of a volunteer. The phantom consisted of five groups of five equally spaced vials, with inner diameters of 6, 4, 2.25, 1.5, and 0.75 mm. (b) An axial slice through the phantom is shown using a static 3D cones acquisition with the phantom strapped around a large doped-water phantom. The inner diameters of each vial are labeled. (c–e) A free-breathing 3D cones acquisition was carried out with the phantom strapped around the chest of a volunteer. An axial slice through the phantom is shown from images reconstructed with (c) no motion correction, (d) rigid-body translational motion correction using SI, AP, and RL trajectories derived from iNAVs located on the volunteer’s heart, and (e) autofocus motion correction using the same iNAV measurements as (d).

Article Snippet: To enable the measurement and subsequent correction of superior-inferior (SI), anterior-posterior (AP), and right-left (RL) translation of the heart due to respiratory motion, sagittal and coronal 2D iNAVs are acquired before and after cones data acquisition every heartbeat, respectively.

Techniques: Labeling, Derivative Assay