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J Cardiovasc Magn Reson. 2003;5(2):387-97.

Cardiac pacemakers, ICDs, and loop recorder: evaluation of translational attraction using conventional ("long-bore") and "short-bore" 1.5- and 3.0-Tesla MR systems.

Author information

1
University of Southern California, Keck School of Medicine, and Institute for Magnetic Resonance, Safety, Education, and Research, Los Angeles, California, USA.

Abstract

PURPOSE:

To evaluate magnet-related translational attraction for cardiac pacemakers, ICDs, and an insertable loop recorder in association with exposure to "long-bore" and "short-bore" 1.5- and 3.0-Tesla MR systems.

MATERIALS AND METHODS:

Fourteen cardiac pacemakers, four ICDs, and one insertable loop recorder were evaluated for translational attraction using deflection angle tests performed at the points of the highest spatial gradients for long-bore and short-bore 1.5- and 3.0-Tesla MR systems according to ASTM guidelines.

RESULTS:

Deflection angles ranged from 9-90 degrees for the long-bore and from 11-90 degrees for the short-bore 1.5-T MR system. Deflection angles ranged from 23-90 degrees for the long-bore and from 34-90 degrees for the short-bore 3.0-T MR system. Three of the cardiovascular implants exhibited deflection angles > or = 45 degrees (i.e., indicating that they are potentially unsafe for patients) on the long-bore and short-bore 1.5-T MR systems. Eight implants exhibited deflection angles > or = 45 degrees on the long-bore 3.0-T MR system, while 14 exhibited deflection angles > or = 45 degrees on the short-bore 3.0-T MR system. In general, deflection angles for these cardiovascular implants were significantly (p < 0.01) higher on 1.5- and 3.0-Tesla short-bore compared to the long-bore MR systems.

CONCLUSIONS:

Several of the cardiovascular implants that underwent evaluation may be problematic for patients undergoing MR procedures using 1.5- and 3.0-T MR systems because of risks associated with magnet-related movements. Obviously, additional MR safety issues must also be considered for these implants.

PMID:
12765117
[Indexed for MEDLINE]

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