Tungsten Used in Medical Imaging Technology

Due to tungsten alloy has high density, excellent radiation attenuation properties, and environmental friendly, it is widely used in medical imaging technology. Medical imaging technology has tended to become more integrated over the past decade. While combined Positron Emission Tomography and Magnetic Resonance Imaging (PET/MRI) is rapidly gaining popularity, no commercial systems for combining the complementary functional imaging techniques of Single Photon Emission Computed Tomography (SPECT) and MRI have been developed. This is mainly due to the physical space constraint, magnetic incompatibility of collimators and the required rotation mechanism inside the MRI bore. Some approaches investigated this integration but no one focused on the development of preclinical SPECT systems and their integration with pre-clinical MRI without compromising image quality and taking into account the MR-compatibility of the collimator material. This study investigates eddy currents in the collimator due to the magnetic field gradients, for different resistivities of tungsten, for small animal SPECT/MRI. Collimator resistivity can be tuned nowadays through tungsten additive.

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