By Warren J. Manning MD, Dudley J. Pennell MD FRCP FACC
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Extra resources for Cardiovascular Magnetic Resonance, Second Edition
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To understand many of the issues in CMR, we need to further understand T2. In general, two distinct processes contribute to the dephasing of spins in the heart. The first mechanism is the true spin-spin interaction (T2) that is unavoidable, irreversible, and dependent on the molecular interactions within the sample. The second process is called T2* (“T2 star”) decay and includes T2 relaxation and also relaxation as a result of the inhomogeneity of the main magnetic field (B0) within the sample.
These phase differences allow the locations of the spins to be determined. 10 Cardiovascular Magnetic Resonance All of the steps are combined into a single acquisition scheme (Fig. 1-12). A separate echo is collected for each phase encoding step. The phase encoding step is most commonly applied immediately after the slice selection process, frequently at the same time that the dephasing gradient for readout occurs (as shown in Fig. 1-12). All of the frequency and phase encoded raw data are combined to create k-space (Fig.
Cardiovascular Magnetic Resonance, Second Edition by Warren J. Manning MD, Dudley J. Pennell MD FRCP FACC