To evaluate the performance of the proposed method quantitatively, a noise-free sensitivity profile is calculated as depicted in Figure-2 (right) employing electromagnetic simulation software FEKO (EMSS - SA). Model parameters: height h=90mm, radius R=37.6mm, α=0° and γ=35°. The coi...
The concurrent PET-MR system for imaging the brain was brought up in the year of 2007, where the PET system with RF coil is fitted within the bore of the magnet (Schlemmer et al.2008). This module of design is adopted by Siemens brain PET insert by using the magnetic field of 3 T ...
a clinical 3 T system (a) was ramped down to 0.75 T (c). In both configurations, the Larmor frequency is equal as the gyromagnetic ratio of1H is approximately four times larger than that of13C. As the scanner software remained
Handler WB, Gilbert KM, Peng H, Chronik BA (2006) Simulation of scattering and attenuation of 511 keV photons in a combined PET/field-cycled MRI system. Phys Med Biol 51:2479–2491 Available from: http://www.ncbi.nlm.nih.gov/pubmed/16675864 Article PubMed Google Scholar Hawkes RC, ...
Based on this simulation, Siemens proposed a nonlinear RG scheme [14] and used it to design a type of signal amplitude compression expander, which was installed in the front-end of the ADC device in an MRI receiver. However, this scheme needs to not only meet the dynamic range and ...
Comparing the simulation results without (Figure 4a) and with (Figure 4b) the RF enhancer also show that inserting the RF enhancer inside the coil causes a slight shift (<1 MHz) in the resonance behavior of the coil.Figure 4. Effect of the RF enhancer on the resonance behavior of the ...
A. Arrangement of potato tubers on a rectangular tray designed for insertion in a box placed in the temperature-regulating device installed inside an RF coil for transverse relaxation time measurements by MRI. B. Redox-potential measurement of tissue from the cross section of a potato tuber. C...
2.3. FDTD EM Simulation: 𝐵+1B1+ Mapping To verify PFT 13C birdcage RF coil performance, B+1B1+ fields were simulated using the 1H body RF coil for transmission and reception for three cases as follows: Body coil with a uniform fat phantom; Body coil with a uniform fat phantom with ...
2.3. FDTD EM Simulation: 𝐵+1B1+ Mapping To verify PFT 13C birdcage RF coil performance, B+1B1+ fields were simulated using the 1H body RF coil for transmission and reception for three cases as follows: Body coil with a uniform fat phantom; Body coil with a uniform fat phantom with ...
Figure 2. Simulation of PSF for CSI and EPI Acquisition. Magnetization decay was modelled across k-space using a pharmacokinetic model. The CSI PSFs resulted in signal blurring in image space whereas the EPI PSF resulted in a delta function. The CSI PSFs for two different flip angles are sh...