Table of Contents
What is TE and TR MRI?
Repetition Time (TR) is the amount of time between successive pulse sequences applied to the same slice. Time to Echo (TE) is the time between the delivery of the RF pulse and the receipt of the echo signal. Tissue can be characterized by two different relaxation times – T1 and T2.
What does TrueFISP stand for?
True fast imaging with steady state precession (TrueFISP) is a coherent technique that uses a fully balanced gradient waveform.
What does ti mean in MRI?
The time between the 180° inverting pulse and the 90°-pulse is called the inversion time (TI). The repetition time (TR) and echo time (TE) are defined as they are for spin echo. Comparison of Spin Echo (SE) and Inversion Recovery (IR).
What is T1 T2 and PD in MRI?
Different contrasts in the area being imaged can be selected for by running different sequences with different weightings. The main three sequences are: T1-weighted (maximum T1 contrast shown) T2-weighted (maximum T2 contrast shown) Proton density (PD) weighting (density of hydrogen protons shown)
What is T2 GRE?
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.
What is FFE MRI?
In this situation, a different image contrast can be obtained, depending on details of the sequence. Four essentially different versions of the basic Fast Field Echo (FFE) sequence can be distinguished and are described systematically in this article. For these sequences, image contrast formulas are presented.
What is magnetic magnetization transfer imaging?
Magnetization transfer (MT) imaging is an MRI technique that can be used to exploit the contrast between tissues where 1 H protons are present in three states 1: 1 bound to macromolecules 2 in free water 3 as water in the hydration layer between the macromolecules and the free water
What is magnetic transfer imaging (MTI)?
Magnetization transfer imaging (MTI) is a technique by which radiofrequency (RF) energy is applied exclusively to the bound pool using specially designed MT pulse (s). Some of this energy is then transferred to the free water pool primarily via dipole-dipole interactions.
What is magnetization transfer contrast (MTC)?
The relative difference in signal between two adjacent tissues (A and B) is known as magnetization transfer contrast (MTC). It should be noted that MTR measurements are not absolute, are susceptible to motion-related errors, and vary significantly as a function of the shape, bandwidth, and frequency offset of the MT pulse.
What is the magnetization transfer ratio (MTR)?
The difference between the signals achieved with and without the off-resonance pulse can be compared and is referred to as the Magnetization Transfer Ratio (MTR). References