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A prototype RF dosimeter for independent measurement of the average specific absorption rate (SAR) during MRI by John P Stralka; Paul A Bottomley is a Medicine article available to read on EtoBox.

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## Abstract ## Purpose To develop a scanner‐independent dosimeter for measuring the average radio frequency (RF) power deposition and specific absorption rates (SAR) for human MRI exposure. ## Materials and Methods A prototype dosimeter has a transducer with orthogonal conducting loops surrounding a small signal‐generating MRI sample. The loops contain resistors whose values are adjusted to load the scanner's MRI coils equivalent to an average head or body during MRI. The scanner adjusts its power output to normal levels during setup, using the MRI sample. Following calibration, the total power and average SAR deposited in the transducer are measured from the root‐mean‐square (rms) power induced in the transducer during MRI. ## Results A 1.5 Tesla head transducer was adjusted to elicit the same load as the average of nine adult volunteers. Once adjusted, the transducer loads other head coils the same as the head does. The dosimeter is calibrated at up to 20 W total deposited power and 4.5 W/kg SAR in the average head, with about 5% accuracy. ## Conclusion This dosimeter provides a simple portable means of measuring the power deposited in a body‐equivalent sample load, independent o

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Author

John P Stralka; Paul A Bottomley

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 1053-1807)

Published

2007

Language

EN

Field

Medicine (Health Sciences)