Measurement of left ventricular dimensions with contrast-enhanced three-dimensional cine imaging facilitated by k-t SENSE.
OBJECTIVE
To compare three-dimensional (3D) k-t sensitivity encoded (k-t SENSE) cine cardiovascular magnetic resonance (CMR), before and after contrast administration, against standard 2D imaging for the assessment of left ventricular volumes and mass.


METHODS
Twenty-six subjects (14 volunteers, 12 patients) underwent multiple breathhold 2D balanced turbo-field echo cine CMR in addition to k-t SENSE accelerated 3D imaging (acceleration factor 5; 5x k-t SENSE), performed before and after administration of a high-relaxivity gadolinium-based contrast agent (Gadobutrolum). k-t acceleration factors of 7 and 10 were also assessed in six volunteers. Left ventricular end diastolic volume (EDV), end systolic volume (ESV), mass, and ejection fraction (EF) were calculated for each method.


RESULTS
There was at least moderate agreement between the EDV, ESV, mass and EF calculated by 2D and 3D 5x k-t SENSE methods before contrast (concordance coefficients 0.92, 0.95, 0.97, 0.92, respectively). Agreement improved following contrast (concordance coefficients 0.97, 0.99, 0.98, 0.93, respectively). The 3D method underestimated all parameters compared to 2D (mean bias pre-contrast 6.1 ml, 0.6 ml, 3.5 g, 2.0% respectively). 3D image quality scores were significantly poorer than 2D, showing a non-significant trend to improvement following contrast administration. Parameters derived with k-t acceleration factors of 7 and 10 showed poorer agreement with 2D values.


CONCLUSIONS
Left ventricular volumes and mass are reliably assessed using 3D 5x k-t SENSE accelerated CMR. Contrast administration further improves agreement between 5x k-t SENSE and 2D-derived measurements. k-t acceleration factors greater than 5, though feasible, produce poorer agreement with 2D values.
Academic Unit of Cardiovascular Medicine, University of Leeds, Leeds, UK. n.maredia@leeds.ac.uk
Neil
N
Maredia
Sebastian
S
Kozerke
Abdul
A
Larghat
Nik
N
Abidin
John P
JP
Greenwood
Peter
P
Boesiger
Sven
S
Plein
D000328:Adult; D000368:Aged; D003287:Contrast Media; D003327:Coronary Disease / Q000175:diagnosis*; D005260:Female; D006352:Heart Ventricles; D006801:Humans; D021621:Imaging, Three-Dimensional; D019028:Magnetic Resonance Imaging, Cine; D008297:Male; D008875:Middle Aged
D003287:Contrast Media