Abstract
The sequence of a multiecho gradient recalled echo (GRE) T2*-weighted imaging (T2*WI) is a relatively new magnetic resonance imaging (MRI) technique. In contrast to T2 relaxation, which acquires a spin echo signal, T2* relaxation acquires a gradient echo signal. The sequence of a GRE T2*WI requires high uniformity of the magnetic field. GRE T2*WI can detect the smallest changes in uniformity in the magnetic field and can improve the rate of small lesion detection. In addition, the T2* value can indirectly reflect changes in tissue biochemical components. Moreover, it can be used for the early diagnosis and quantitative diagnosis of some diseases. This paper reviews the principles and clinical applications as well as the advantages and disadvantages of GRE T2*WI.
Highlights
The sequence of a multiecho gradient recalled echo (GRE) T2∗-weighted imaging (T2∗WI) acquires a gradient echo signal, and depending on the technical characteristics, there are some advantages of this technique
Compared with T2 relaxation, which is based on the principle of the sequence of GRE T2∗WI, the decay of T2∗ relaxation was added as a factor of the main magnetic field
We highlight the clinical applications of GRE T2∗WI
Summary
The sequence of a multiecho gradient recalled echo (GRE) T2∗-weighted imaging (T2∗WI) acquires a gradient echo signal, and depending on the technical characteristics, there are some advantages of this technique. The sequence of GRE T2∗WI requires high uniformity of the magnetic field, independent of the paramagnetic substance or diamagnetic substance. Term is affected by the local susceptibility fields This is the theoretical basis by which the GRE T2∗WI can detect the smallest changes in uniformity in a magnetic field [2]. Compared with T2 relaxation, which is based on the principle of the sequence of GRE T2∗WI, the decay of T2∗ relaxation was added as a factor of the main magnetic field. The sequence of GRE T2∗WI requires high uniformity of the magnetic field. GRE T2∗WI can detect the smallest changes in uniformity in the magnetic field and can improve the detection rate of a small lesion, such as the paramagnetic substance deposition, similar to iron deposition [8]. This process is completed using postprocessing software directly after scanning
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