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Abstract #0487

Myocardial Tagging in the Polar Coordinate System; Initial Clinical Results

Sarah N. Khan1, Abbas N. Moghaddam2, Razieh Kaveh2, Ali Nsair3, Mona Bhatia4, J. Paul Finn5

1Diagnostic Cardiovascular Imaging, Department of Radiology,, UCLA, Los Angeles, CA, United States; 2Biomedical Engineering, Amirkabir University of Technology, Tehran, Iran; 3Department of Cardiology, UCLA, Los Angeles, CA, United States; 4Diagnostic Cardiovascular Imaging, Department of Radiology, UCLA, Los Angeles, CA, United States; 5Diagnostic Cardiovascular Imaging, Department of Radiology, University of California Los Angeles, Los Angeles, CA, United States

We compared grid, radial and circular tagging patterns for assessment of radial and circumferential myocardial displacement in 10 volunteers and 18 patients (10 congenital heart disease (CHD) and 8 cardiomyopathy (CM)). Images were scored subjectively and processed quantitatively for circumferential and radial strain. Polar tagging was easier to interpret (ave 3.6) than grid tagging (ave 2.9). Tag quality and confidence in strain assessment was similar among the three tag groups. Patients with CM had diminished radial strain rate (1.190.26 sec-1) when compared to volunteers (1.640.61 sec-1). We conclude that polar tagging has advantages for the visual and quantitative assessment of myocardial strain.

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Keywords

accelerated advantages affecting among assessment assigned automated axis biomedical cardiac cardiology cardiovascular cine circle circular circumferential clinical components confidence congenital coordinate curved deformation degree described diagnostic diastolic differently difficult diminished disease displacement displacements distortion ease easier ejection engineering evaluates findings fraction frequently give global grid healthy heart highest ideal infarction initial insight interpret interpretation isolate journal khan looking lowest make mild myocardial observers overall overview parallel pathologic patient patients pattern patterns polar potential previously quality quantification quantitative radial radiology rather regional representing scale scored scores segments semi separation septum severe short significantly simulation slice specifically straight strain strains subjects system systolic tagging tags technology tool underwent ventricle ventricular visual visualization visually volunteer volunteers year