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An automatic segmentation for improved visualization of atrial ablation lesions using magnetic resonance imaging

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Delayed-enhancement (DE) MRI is an effective technique for imaging left atrial (LA) ablation lesions following radio-frequency ablation for atrial fibrillation (AF)... Existing techniques for segmentation/visualization of lesions require manual interaction of an expert user making them prone to high observer variability... The aim of our work was to develop a fully-automated approach for LA lesion segmentation/visualization... Five patients with paroxysmal AF (2 male, average age 55 years, LA size 4.2±0.5cm) underwent pulmonary vein (PV) isolation achieving successful electrical isolation of all PVs... Imaging was performed 6-months post-ablation on a Philips 1.5T Achieva with scans including respiratory-navigated and cardiac-gated whole-heart 3D-SSFP and inversion recovery-prepared MRI for visualization of Gd-DTPA DE (complete LA coverage, resolution of 1.3×1.3×2mm)... The endocardial cavity of the LA was segmented from the whole heart SSFP-MRI scan... The segmented LA was registered to the DE-MRI scan using DICOM header data... The DE-MRI images were segmented using the proposed algorithm and by an expert using the approach in... The algorithm segmented scars in less than 30 seconds on a 2.2GHz PC with no user interaction... Table 1 and Figure 1 show that there was good agreement between the results from the novel approach and the expert’s semi-automatic segmentation... This study demonstrates a fully-automatic and rapid segmentation/visualization of post-ablation LA DE-MRI that will minimise the observer variability that is seen with existing approaches that require expert manual interactions.

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(left image) Surface visualization of 3 cases (patients 1, 3 and 5 from Table 1) with red regions indicating detected areas of scar. (right image) 3D voxel-wise segmentation of scar as seen on two selected slices from patient 1.
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Figure 1: (left image) Surface visualization of 3 cases (patients 1, 3 and 5 from Table 1) with red regions indicating detected areas of scar. (right image) 3D voxel-wise segmentation of scar as seen on two selected slices from patient 1.

Mentions: The algorithm segmented scars in less than 30 seconds on a 2.2GHz PC with no user interaction. The total surface area of scar was computed and represented as a percentage of the atrial surface area. Table 1 and Figure 1 show that there was good agreement between the results from the novel approach and the expert’s semi-automatic segmentation.


An automatic segmentation for improved visualization of atrial ablation lesions using magnetic resonance imaging
(left image) Surface visualization of 3 cases (patients 1, 3 and 5 from Table 1) with red regions indicating detected areas of scar. (right image) 3D voxel-wise segmentation of scar as seen on two selected slices from patient 1.
© Copyright Policy - open-access
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC3106548&req=5

Figure 1: (left image) Surface visualization of 3 cases (patients 1, 3 and 5 from Table 1) with red regions indicating detected areas of scar. (right image) 3D voxel-wise segmentation of scar as seen on two selected slices from patient 1.
Mentions: The algorithm segmented scars in less than 30 seconds on a 2.2GHz PC with no user interaction. The total surface area of scar was computed and represented as a percentage of the atrial surface area. Table 1 and Figure 1 show that there was good agreement between the results from the novel approach and the expert’s semi-automatic segmentation.

View Article: PubMed Central - HTML

AUTOMATICALLY GENERATED EXCERPT
Please rate it.

Delayed-enhancement (DE) MRI is an effective technique for imaging left atrial (LA) ablation lesions following radio-frequency ablation for atrial fibrillation (AF)... Existing techniques for segmentation/visualization of lesions require manual interaction of an expert user making them prone to high observer variability... The aim of our work was to develop a fully-automated approach for LA lesion segmentation/visualization... Five patients with paroxysmal AF (2 male, average age 55 years, LA size 4.2±0.5cm) underwent pulmonary vein (PV) isolation achieving successful electrical isolation of all PVs... Imaging was performed 6-months post-ablation on a Philips 1.5T Achieva with scans including respiratory-navigated and cardiac-gated whole-heart 3D-SSFP and inversion recovery-prepared MRI for visualization of Gd-DTPA DE (complete LA coverage, resolution of 1.3×1.3×2mm)... The endocardial cavity of the LA was segmented from the whole heart SSFP-MRI scan... The segmented LA was registered to the DE-MRI scan using DICOM header data... The DE-MRI images were segmented using the proposed algorithm and by an expert using the approach in... The algorithm segmented scars in less than 30 seconds on a 2.2GHz PC with no user interaction... Table 1 and Figure 1 show that there was good agreement between the results from the novel approach and the expert’s semi-automatic segmentation... This study demonstrates a fully-automatic and rapid segmentation/visualization of post-ablation LA DE-MRI that will minimise the observer variability that is seen with existing approaches that require expert manual interactions.

No MeSH data available.


Related in: MedlinePlus