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Philips has introduced the world's first whole body sequential PET/MR system. We present the current status of MR-based attenuation correction (MRAC) technique. MRAC consists of MR image acquisition, segmentation, truncation compensation (TC), μ-value assignment, as well as correction for patient table and RF coils. These components have been described last year; this paper focuses on updates of the...
In this paper MR-based attenuation method was implemented for a clinical whole-body PET/MR system. While awaiting future clinical evaluation, the algorithm seems promising from preliminary patient data evaluation, from both qualitative PET image quality and quantification accuracy. While the 3-segment MRAC resembles the results from short PET transmission scans, future work will be to implement and...
A sequential PET/MR system like Philips Gemini TF PET/MR system generates attenuation correction map from an MR image instead of a CT or transmission image for PET reconstruction. One problem in MR-based attenuation correction is that the MR table and coils are invisible in MR images but they may contain high density materials which have to be compensated for attenuation. This work investigates the...
This work presents the application of a quantitative magnetic resonance imaging (MRI) technique in stereotactic deep-brain neurosurgery planning procedures. The high spatial resolution T1 and T2 maps acquired using this imaging method have been normalized to the standard CJH-27 brain coordinate system and integrated into a neurosurgical visualization and navigation system to improve the accuracy...
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