Document Detail

Improved left ventricular mass quantification with partial voxel interpolation: in vivo and necropsy validation of a novel cardiac MRI segmentation algorithm.
MedLine Citation:
PMID:  22104165     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Cardiac magnetic resonance (CMR) typically quantifies LV mass (LVM) by means of manual planimetry (MP), but this approach is time-consuming and does not account for partial voxel components--myocardium admixed with blood in a single voxel. Automated segmentation (AS) can account for partial voxels, but this has not been used for LVM quantification. This study used automated CMR segmentation to test the influence of partial voxels on quantification of LVM.
METHODS AND RESULTS: LVM was quantified by AS and MP in 126 consecutive patients and 10 laboratory animals undergoing CMR. AS yielded both partial voxel (AS(PV)) and full voxel (AS(FV)) measurements. Methods were independently compared with LVM quantified on echocardiography (echo) and an ex vivo standard of LVM at necropsy. AS quantified LVM in all patients, yielding a 12-fold decrease in processing time versus MP (0:21±0:04 versus 4:18±1:02 minutes; P<0.001). AS(FV) mass (136±35 g) was slightly lower than MP (139±35; Δ=3±9 g, P<0.001). Both methods yielded similar proportions of patients with LV remodeling (P=0.73) and hypertrophy (P=1.00). Regarding partial voxel segmentation, AS(PV) yielded higher LVM (159±38 g) than MP (Δ=20±10 g) and AS(FV) (Δ=23±6 g, both P<0.001), corresponding to relative increases of 14% and 17%. In multivariable analysis, magnitude of difference between AS(PV) and AS(FV) correlated with larger voxel size (partial r=0.37, P<0.001) even after controlling for LV chamber volume (r=0.28, P=0.002) and total LVM (r=0.19, P=0.03). Among patients, AS(PV) yielded better agreement with echo (Δ=20±25 g) than did AS(FV) (Δ=43±24 g) or MP (Δ=40±22 g, both P<0.001). Among laboratory animals, AS(PV) and ex vivo results were similar (Δ=1±3 g, P=0.3), whereas AS(FV) (6±3 g, P<0.001) and MP (4±5 g, P=0.02) yielded small but significant differences with LVM at necropsy.
CONCLUSIONS: Automated segmentation of myocardial partial voxels yields a 14-17% increase in LVM versus full voxel segmentation, with increased differences correlated with lower spatial resolution. Partial voxel segmentation yields improved CMR agreement with echo and necropsy-verified LVM.
Noel C F Codella; Hae Yeoun Lee; David S Fieno; Debbie W Chen; Sandra Hurtado-Rua; Minisha Kochar; John Paul Finn; Robert Judd; Parag Goyal; Jesse Schenendorf; Matthew D Cham; Richard B Devereux; Martin Prince; Yi Wang; Jonathan W Weinsaft
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Validation Studies     Date:  2011-11-21
Journal Detail:
Title:  Circulation. Cardiovascular imaging     Volume:  5     ISSN:  1942-0080     ISO Abbreviation:  Circ Cardiovasc Imaging     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2012-01-18     Completed Date:  2012-03-19     Revised Date:  2013-06-27    
Medline Journal Info:
Nlm Unique ID:  101479935     Medline TA:  Circ Cardiovasc Imaging     Country:  United States    
Other Details:
Languages:  eng     Pagination:  137-46     Citation Subset:  IM    
Department of Physiology/Biophysics, Weill Cornell Medical College, New York, NY 10021, USA.
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MeSH Terms
Heart Ventricles / pathology*,  ultrasonography
Hypertrophy, Left Ventricular / pathology*,  ultrasonography
Image Processing, Computer-Assisted / methods*
Magnetic Resonance Imaging / methods*
Middle Aged
Observer Variation
Reproducibility of Results
Ventricular Function, Left
Ventricular Remodeling*
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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