AMA CPT® Assistant - 1995 Issue 3 (March)

MRI and MRA of the Heart (Fall 1995)

Fall 1995 pages 1-2 MRI and MRA of the Heart Magnetic Resonance Imaging (MRI) technology is based on the principle that protons within body tissues and fluids, when placed in a magnetic field, can absorb and subsequently emit radio frequency signals. Differences in signal strength are then used to generate images. Magnetic Resonance Angiography (MRA) evolved as a modification of MRI technology. In an MRA, the body is placed in a homogeneous magnetic field. A selected volume of flowing blood is magnetically depolarized with a radio frequency pulse and acts as an internal contrast agent to static tissue. It...

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CPT® Assistant content is the official source for CPT® coding guidance. It is an instrumental tool when appealing insurance denials and validating coding to auditors. Monthly issues and an extensive archive provide comprehensive guidance on proper CPT® coding for past, present and upcoming code set releases. Archives date back to 1990 for historical use of codes, changes, rationales, coding tips and trends in the industry.

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