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Phantom measurements and error estimation in volume determination with electrocardiogram triggered cardio computed tomography

Phantom measurements and error estimation in volume determination with electrocardiogram triggered cardio computed tomography

Medical Progress Through Technology 10(1): 55-62

The ECG-triggered CT[computed tomography]-imaging-procedure (CT system SOMATOM with ECG unit) provides the possibility of displaying the beating heart in each of its individual mobility phases. Thus, the telediastolic and telesystolic volumes of the left ventricle can be determined approximately and from this its ejection fraction. Measurements on moving phantoms (acryl plate, fluid-filled balloon) were described. They give an estimation of the accuracy with which cross-sectional areas can be determined by the above-mentioned CT-system as a function of the frequency of the movement and of the number of tube rotations per slice. Basing on those models and not paying regard to further sources of error as, for example, an irregular heartbeat, it was found that the ejection fraction can be determined with a relative error of .+-.11%..+-.13% depending on the beat frequency. [Implications with respect to the use of this technique as a diagnostic modality in humans are presented.].

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