Evaluation of ECG-gated [(11)C]acetate PET for measuring left ventricular volumes, mass, and myocardial external efficiency.
Noninvasive estimation of myocardial external efficiency (MEE) requires measurements of left ventricular (LV) oxygen consumption with [(11)C]acetate PET in addition to LV stroke volume and mass with cardiovascular magnetic resonance (CMR). Measuring LV geometry directly from ECG-gated [(11)C]acetate PET might enable MEE evaluation from a single PET scan. Therefore, we sought to establish the accuracy of measuring LV volumes, mass, and MEE directly from ECG-gated [(11)C]acetate PET.



Thirty-five subjects with aortic valve stenosis underwent ECG-gated [(11)C]acetate PET and CMR. List mode PET data were rebinned into 16-bin ECG-gated uptake images before measuring LV volumes and mass using commercial software and compared to CMR. Dynamic datasets were used for calculation of mean LV oxygen consumption and MEE.



LV mass, volumes, and ejection fraction measured by CMR and PET correlated strongly (r = 0.86-0.92, P < .001 for all), but were underestimated by PET (P < .001 for all except ESV P = .79). PET-based MEE, corrected for bias, correlated fairly with PET/CMR-based MEE (r = 0.60, P < .001, bias -3 ± 21%, P = .56). PET-based MEE bias was strongly associated with LV wall thickness.



Although analysis-related improvements in accuracy are recommended, LV geometry estimated from ECG-gated [(11)C]acetate PET correlate excellently with CMR and can indeed be used to evaluate MEE.
Department of Cardiology, Aarhus University Hospital, Aarhus C, Denmark. nilhan@rm.dk.
Nils Henrik
NH
Hansson
Department of Nuclear Medicine & PET-Centre, Aarhus University Hospital, Aarhus C, Denmark.
Lars
L
Tolbod
Department of Nuclear Medicine & PET-Centre, Aarhus University Hospital, Aarhus C, Denmark.
Hendrik Johannes
HJ
Harms
Department of Cardiology, Aarhus University Hospital, Aarhus C, Denmark.
Henrik
H
Wiggers
Department of Cardiology, Aarhus University Hospital, Aarhus C, Denmark.|MR Research Centre, Aarhus University Hospital, Aarhus C, Denmark.
Won Yong
WY
Kim
MR Research Centre, Aarhus University Hospital, Aarhus C, Denmark.|Danish Diabetes Academy, Odense, Denmark.
Esben
E
Hansen
Department of Cardiology, Aarhus University Hospital, Aarhus C, Denmark.
Tomas
T
Zaremba
Department of Nuclear Medicine & PET-Centre, Aarhus University Hospital, Aarhus C, Denmark.
Jørgen
J
Frøkiær
Department of Nuclear Medicine & PET-Centre, Aarhus University Hospital, Aarhus C, Denmark.
Steen
S
Jakobsen
Department of Nuclear Medicine & PET-Centre, Aarhus University Hospital, Aarhus C, Denmark.
Jens
J
Sørensen
D000085:Acetates; D002250:Carbon Radioisotopes; D057791:Cardiac Imaging Techniques / Q000379:methods; D055424:Cardiac-Gated Imaging Techniques / Q000379:methods*; D005260:Female; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods; D008297:Male; D008875:Middle Aged; D009929:Organ Size; D010101:Oxygen Consumption; D049268:Positron-Emission Tomography / Q000379:methods*; D019275:Radiopharmaceuticals; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013318:Stroke Volume; D018487:Ventricular Dysfunction, Left / Q000000981:diagnostic imaging* / Q000503:physiopathology*
D000085:Acetates; D002250:Carbon Radioisotopes; D019275:Radiopharmaceuticals
Myocardial external efficiency; PET imaging; magnetic resonance imaging; metabolism: PET