Abstract
Hybrid imaging with PET/MRI combines excellent soft tissue contrast and various functional imaging parameters provided by MR imaging with high sensitivity and quantification of radiotracer uptake provided by PET. While clinical evaluation now is under way, PET/MRI demands for new technologies and innovative methodological solutions, currently subject to interdisciplinary research. Attenuation correction (AC) of the patient tissues has to be MR based since CT attenuation information is missing. MR-based AC, however, is inherently associated with challenges: patient tissues are segmented into only few tissue classes, providing discrete attenuation coefficients, and the bone is substituted as soft tissue in MR-based AC. Additionally, hardware components such as the system’s patient table and radiofrequency (RF) coils for MR imaging need to be considered in AC to maintain quantification of PET imaging. This chapter provides an introduction into current PET/MRI system designs and into physical challenges and methodological solutions for attenuation and motion correction. Furthermore, specific challenges of cardiac PET/MR hybrid imaging are highlighted.
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Quick, H.H. (2015). PET/MRI: Physics, Instrumentation, and Systems. In: Schindler, T., George, R., Lima, J. (eds) Molecular and Multimodality Imaging in Cardiovascular Disease. Springer, Cham. https://doi.org/10.1007/978-3-319-19611-4_1
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DOI: https://doi.org/10.1007/978-3-319-19611-4_1
Publisher Name: Springer, Cham
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