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Temperature measurement on neurological pulse generators during MR scans.

Kainz W, Neubauer G, Uberbacher R, Alesch F, Chan DD - Biomed Eng Online (2002)

Bottom Line: Temperature increases in other locations were low compared to the one at the lead tip.The measured temperature increase of 2.1 degrees C can not be considered as harmful to the patient.Comparison with the results of other studies revealed the avoidance of loops as a practical method to reduce heating during MRI procedures.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mobile Communications Safety, ARC Seibersdorf Research, Austria. kainz@gmx.com

ABSTRACT
According to manufacturers of both magnetic resonance imaging (MRI) machines, and implantable neurological pulse generators (IPGs), MRI is contraindicated for patients with IPGs. A major argument for this restriction is the risk to induce heat in the leads due to the electromagnetic field, which could be dangerous for the surrounding brain parenchyma. The temperature change on the surface of the case of an ITREL-III (Medtronic Inc., Minneapolis, MN) and the lead tip during MRI was determined. An anatomical realistic and a cubic phantom, filled with phantom material mimicking human tissue, and a typical lead configuration were used to imitate a patient who carries an IPG for deep brain stimulation. The measurements were performed in a 1.5 T and a 3.0 T MRI. 2.1 degrees C temperature increases at the lead tip uncovered the lead tip as the most critical part concerning heating problems in IPGs. Temperature increases in other locations were low compared to the one at the lead tip. The measured temperature increase of 2.1 degrees C can not be considered as harmful to the patient. Comparison with the results of other studies revealed the avoidance of loops as a practical method to reduce heating during MRI procedures.

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Temperature at the lead tip as a function of time for the measurements at the 3.0 T MRI (MR-scan: from 300 to 1001 seconds)
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Figure 4: Temperature at the lead tip as a function of time for the measurements at the 3.0 T MRI (MR-scan: from 300 to 1001 seconds)

Mentions: The results were similar to the results at the 1.5 T machine: slight and slow temperature increase at the implant and fast and higher temperature increase at the lead tip. The increase of the implant itself was 0.2°C. Almost the same was measured in the realistic phantom at 1.5 T. At the lead tip, the temperature increased 0.8°C. The temperature at the lead tip versus time is shown in Figure 4.


Temperature measurement on neurological pulse generators during MR scans.

Kainz W, Neubauer G, Uberbacher R, Alesch F, Chan DD - Biomed Eng Online (2002)

Temperature at the lead tip as a function of time for the measurements at the 3.0 T MRI (MR-scan: from 300 to 1001 seconds)
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC130994&req=5

Figure 4: Temperature at the lead tip as a function of time for the measurements at the 3.0 T MRI (MR-scan: from 300 to 1001 seconds)
Mentions: The results were similar to the results at the 1.5 T machine: slight and slow temperature increase at the implant and fast and higher temperature increase at the lead tip. The increase of the implant itself was 0.2°C. Almost the same was measured in the realistic phantom at 1.5 T. At the lead tip, the temperature increased 0.8°C. The temperature at the lead tip versus time is shown in Figure 4.

Bottom Line: Temperature increases in other locations were low compared to the one at the lead tip.The measured temperature increase of 2.1 degrees C can not be considered as harmful to the patient.Comparison with the results of other studies revealed the avoidance of loops as a practical method to reduce heating during MRI procedures.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mobile Communications Safety, ARC Seibersdorf Research, Austria. kainz@gmx.com

ABSTRACT
According to manufacturers of both magnetic resonance imaging (MRI) machines, and implantable neurological pulse generators (IPGs), MRI is contraindicated for patients with IPGs. A major argument for this restriction is the risk to induce heat in the leads due to the electromagnetic field, which could be dangerous for the surrounding brain parenchyma. The temperature change on the surface of the case of an ITREL-III (Medtronic Inc., Minneapolis, MN) and the lead tip during MRI was determined. An anatomical realistic and a cubic phantom, filled with phantom material mimicking human tissue, and a typical lead configuration were used to imitate a patient who carries an IPG for deep brain stimulation. The measurements were performed in a 1.5 T and a 3.0 T MRI. 2.1 degrees C temperature increases at the lead tip uncovered the lead tip as the most critical part concerning heating problems in IPGs. Temperature increases in other locations were low compared to the one at the lead tip. The measured temperature increase of 2.1 degrees C can not be considered as harmful to the patient. Comparison with the results of other studies revealed the avoidance of loops as a practical method to reduce heating during MRI procedures.

Show MeSH
Related in: MedlinePlus