Theoretical formulation on thermally generated magnetic field noise measured with atomic magnetometer

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  • 原子磁気センサを用いた生体熱雑音磁場計測の理論的検討
  • ゲンシ ジキ センサ オ モチイタ セイタイ ネツ ザツオン ジバ ケイソク ノ リロンテキ ケントウ

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Abstract

In recent years, there has been considerable interest in applying atomic magnetometer (AM) to biomagnetic measurement including MRI. However, a precise estimation of the thermal noise generated from biological object has not been carried out. Conventionally, the thermal noise has been estimated by considering a resistor that is electrically equivalent to a biological-conductive sample and is connected in series to a pickup coil. However, this method has major limitations in that the receiver has to be a coil and that it cannot be applied directly to a system using AM. In this paper, we propose a method to estimate the thermal noise measured by AM. We calculate the thermal noise from the variance of the magnetic sensor output produced by current-dipole moments that simulate thermally fluctuating current sources in a biological sample. We validate the proposed method by comparing our results with those obtained by conventional method with the system using the pickup coil as the sensor. Then, we apply the proposed method to the system using AM as the receiver with realistic head model and estimate the thermal noise.

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