Comprehensive Diagnosis of Heart Disease with a Single CT Scan

The team, led by Balazs Ruzsics, M.D., Ph.D., Eric Powers, M.D., medical director of MUSC Heart and Vascular Center, and U. Joseph Schoepf, M.D., director of CT Research and Development at the Medical University of South Carolina (MUSC, Charleston, SC, USA; www.muschealth.com), explored how CT scans can now detect blocked arteries and narrowing of the blood vessels in the heart in addition to poor blood flow in the heart muscle. Their findings were published in the March 4, 2008, issue of the journal Circulation.

The single-scan technique would also provide considerable cost savings, as well as greater convenience and reduced radiation exposure for patients. For their approach, the MUSC physicians used a Dual-Source CT scanner. The MUSC scanner was the first unit worldwide that was enabled to acquire images of the heart with the dual-energy technique. While the CT scan "dissects” the heart into thin layers, enabling clinicians to detect diseased vessels and valves, it could not detect blood flow.

The MUSC researchers added two X-ray spectrums, each emitting varying degrees of energy similar to a series of X-rays, to gain a static image of the coronary arteries and the heart muscle. This dual-energy technique of the CT scan enables mapping the blood distribution within the heart muscle and pinpointing areas with decreased blood supply. All this is accomplished with a single CT scan within one short breath-hold of approximately 15 seconds or less. In addition to diagnosing the heart, the CT scan also allows clinicians to check for other diseases that may be lurking in the lungs or chest wall.

MUSC physicians have long recommended the use of CT scans of the heart to detect blockages or narrowing of heart vessels as harbingers of a heart attack without the need for an invasive heart catheterization. However, for a comprehensive diagnosis of coronary artery disease, MUSC, like most cardiovascular centers, had conventionally relied on several imaging modalities, such as cardiac catheterization, nuclear medicine, or magnetic resonance (MR) scanners.

"This technique could be the long coveted ‘one-stop-shop' test that allows us to look at the heart vessels, heart function, and heart blood flow with a single CT scan and within a single breath-hold,” said Dr. Schoepf, the lead investigator of the study.

Based on their initial observations, Heart and Vascular Center physicians have now launched an intensive research project aimed at systemically comparing the new scanning technique to conventional methods for detecting decreased blood supply in the heart muscle.


Related Links:
Medical University of South Carolina Heart and Vascular Center