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A device for a noninvasive evaluation of coronary bypass grafts

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3 Author(s)
McInerney, J.J. ; Dept. of Bioeng., Pennsylvania State Univ., Hershey, PA, USA ; Lamser, D.G. ; Herr, M.D.

A new device is presented for evaluating the patency of coronary bypass grafts. Bypass grafts are located within the chest cavity using a Compton backscatter imaging (CBI) technique that creates frontal plane tomographic images. The tomographic image pixels are mapped into computer memory and displayed. A display pointer is used to mark the position of the bypass graft. The computer uses that information to subsequently position a radiation detector, such that it “looks” at the location of the bypass graft within the closed chest. The patency of the graft is then evaluated by monitoring an X-ray induced iodine fluorescence transient in the graft, subsequent to a peripheral intravenous contrast injection. This imaging and graft evaluation device is relatively inexpensive and its application does not require cutdowns or catheterization. The associated radiation dose is 1/10 to 1/50 of that associated with alternative X-ray graft patency evaluation techniques. Preliminary testing has been performed on mechanical and animal models

Published in:

Medical Imaging, IEEE Transactions on  (Volume:13 ,  Issue: 4 )