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S Kaushikkar

Publications and source records attributed to S Kaushikkar.

4 recordsLinked to original sources
PubMed1998

Detection of coronary stenoses on source and projection images using three-dimensional MR angiography with retrospective respiratory gating: preliminary experience.

OBJECTIVE: Our objective was to study the ability of three-dimensional MR angiography with retrospective respiratory gating to reveal stenoses in proximal coronary arteries on source and projection images. CONCLUSION: Proximal coronary artery stenoses can be identified using three-dimensional MR angiography with retrospective respiratory gating, both with projection images and on source images alone. Reasons for missed lesions included collateral vessels and retrograde flow distal to complete occlusion and volume averaging of vessels with adjacent structures. Causes of false-positive interpretations included small foci of decreased signal intensity distal to complete occlusion, partial volume effects on individual partitions, and regions of distal vessels leaving the imaging plane.

Aged↗
PubMed1996

Coronary arteries: three-dimensional MR imaging with retrospective respiratory gating.

Thin-section, three-dimensional (3D) gradient-echo magnetic resonance imaging of the coronary arteries was performed without and with retrospective respiratory gating in 12 healthy volunteers and one patient. In all examinations, results were improved with gating. In five of seven volunteer examinations, coronary artery delineation on images reconstructed by using the least-squares method for motion detection with navigator echoes was found to be equal to that obtained by using edge detection. Images in five other volunteers covered the entire heart with multiple overlapping 3D slabs. The arteries were segmented from the background and could be viewed from any orientation. The lengths of contiguously visible vessels were as follows: left main coronary artery, 11.5 mm +/- 0.4 (mean +/- standard deviation); left anterior descending branch, 115.9 mm +/- 19.7; left circumflex branch, 97.2 mm +/- 12.5; and right coronary artery, 125.9 mm +/- 18.8. This respiratory gating technique clearly improved depiction of the coronary arteries.

Adult↗
PubMed1995

Cardiac MR imaging: principles and techniques.

Magnetic resonance (MR) imaging is becoming an important tool in diagnosing cardiovascular disease. Many technical advances have contributed to the improved capability of MR imaging in this arena. In this article, we review the technical concepts and recent advances for a variety of cardiovascular applications, including evaluation of congenital heart and great vessel disease, global cardiac function using cine acquisitions and automated ventricular volume segmentation, valvular heart disease, myocardial wall motion detection with magnetization tagging, two-dimensional and three-dimensional coronary artery imaging, and myocardial perfusion. Sequence diagrams are shown and important technical issues are discussed. Example images are shown to demonstrate the current status of research and future potential. Most results shown here are high-resolution scans acquired with new gradient coil systems, including coronary artery imaging using an in-plane resolution of 350 microns x 600 microns. This review serves as an introduction to the discussion of various clinical applications of cardiovascular MR imaging provided in this issue.

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