Mr. Aaron So Profile

Aaron So

at Robarts Research Institute

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Proceedings Article | 2 May 2003 Paper

Manual and semi-automatic registration vs retrospective ECG gating for correction of cardiac motion

Aaron So, Vincent Adam, Kishor Acharya, Tin-Su Pan, Ting-Yim Lee

Proceedings Volume 5031, (2003) https://doi.org/10.1117/12.480398

KEYWORDS: Image registration, Heart, Electrocardiography, Tissues, Computed tomography, Image enhancement, Visualization, Motion measurement, Neodymium, Imaging systems

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A manual and a semi-automatic image registration method were compared with retrospective ECG (rECG) gating to correct for cardiac motion in myocardial perfusion (MBF) measurement. 5 beagles were used in 11 experiments. For each experiment a 30 s cine CT scan of the heart was acquired after contrast injection. For the manual method, a reference end-diastole (ED) image was selected from the first cardiac cycle. ED images in subsequent cardiac cycles were manually selected to match the shape of the reference ED image. For each cardiac cycle in the semi-automatic method, the image with the maximum area and the most similar shape to the selected image of the previous cardiac cycle was chosen as ED image. MBFs were calculated from the images registered by the three methods and compared. The averages of the difference of MBF_manual and MBF_semi-auto and MBF_rECG in the lateral free wall of LV were 3.6 and 3.4 ml/min/100g respectively. The corresponding standard deviations from the mean were 9.1 and 28.3 ml/min/100g respectively. We concluded from these preliminary results that image registration methods were better than rECG gating for correcting heart, which should facilitate more precise measurement of MBF.

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