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Deformable left-ventricle mesh model for motion-compensated filtering in cardiac gated SPECT
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10.1118/1.3483098
/content/aapm/journal/medphys/37/10/10.1118/1.3483098
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/37/10/10.1118/1.3483098

Figures

Image of FIG. 1.
FIG. 1.

Mesh model defined on the left ventricle. (a) Transverse and sagittal cross-sections of FBP reconstructed images. (b) Cross-sections with highlighted detected myocardial surfaces. (c) Myocardial surfaces and sampled mesh nodes (dots for support nodes and circles for myocardial nodes). (d) Mesh elements (tetrahedrons) shown between myocardial surfaces.

Image of FIG. 2.
FIG. 2.

Shape of the temporal window controlled by the parameter .

Image of FIG. 3.
FIG. 3.

Estimated mesh structure for the NCAT phantom at end systole with motion vectors (black arrows) between end systole and end diastole.

Image of FIG. 4.
FIG. 4.

Horizontal long-axis view of images filtered after FBP reconstruction at the ED and ES frames. (a) Reconstruction from noiseless projections, (b) spatial only, (c) 121 method, and (d) proposed method.

Image of FIG. 5.
FIG. 5.

Short-axis view of images filtered after FBP reconstruction at the ED and ES frames. (a) Reconstruction from noiseless projections, (b) spatial only, (c) 121 method, and (d) proposed method.

Image of FIG. 6.
FIG. 6.

Horizontal long-axis views of images filtered after EM reconstruction at the ED and ES frames. (a) Reconstruction from noiseless projections, (b) spatial only, (c) 121 method, and (d) proposed method.

Image of FIG. 7.
FIG. 7.

Short-axis views of images filtered after EM reconstruction at the ED and ES frames. (a) Reconstruction from noiseless projections, (b) spatial only, (c) 121 method, and (d) proposed method.

Image of FIG. 8.
FIG. 8.

Horizontal long-axis views for five clinical data sets at the ED and ES frames filtered by (a) spatial only, (b) 121 method, and (c) proposed method. Note that patient D is affected by a severe perfusion detect in the apical region.

Image of FIG. 9.
FIG. 9.

PSNR as a function of the temporal filter strength for (a) a spatial filter fixed at its optimal cutoff frequency and (b) a temporal filter fixed at its optimal strength . Images were reconstructed via FBP.

Image of FIG. 10.
FIG. 10.

PSNR as a function of the temporal filter strength for (a) a spatial filter fixed at its optimal cutoff frequency and (b) a temporal filter fixed at its optimal strength . Images were reconstructed via EM.

Image of FIG. 11.
FIG. 11.

Region of interest used for bias-standard deviation curve at the ED.

Image of FIG. 12.
FIG. 12.

Bias-standard deviation curve for FBP images at the ED with (a) varying temporal filter strength and (b) varying spatial cutoff frequency. For (a), the cutoff frequency of the spatial filter was fixed to . For (b), the temporal filter parameter was fixed to .

Image of FIG. 13.
FIG. 13.

Bias-standard deviation curve for FBP images at the ED with (a) varying temporal filter strength and (b) varying spatial cutoff frequency. For (a), the cutoff frequency of the spatial filter was fixed to . For (b), the temporal filter parameter was fixed to .

Tables

Generic image for table
TABLE I.

Ejection fraction measurement for the different methods (FBP reconstruction). Values were obtained using the INVIA CORRIDOR4DM software (except for the true NCAT value obtained from the NCAT program).

Generic image for table
TABLE II.

Ejection fraction measurement for the different methods (EM reconstruction). Values were obtained using the INVIA CORRIDOR4DM software (except for the true NCAT value obtained from the NCAT program).

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/content/aapm/journal/medphys/37/10/10.1118/1.3483098
2010-09-28
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Deformable left-ventricle mesh model for motion-compensated filtering in cardiac gated SPECT
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/37/10/10.1118/1.3483098
10.1118/1.3483098
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