Imaging parameters

In MRI, many different pulse sequences are available. The choice of the sequence parameters will have an influence on the amount of signal coming from the object and hence will affect the SNR. These parameters include the echo time TE, the inversion time TI, the repetition time TR, the flip angle $\alpha$, the shape of the radio frequent pulses, etc. The actual relationship between those parameters and the SNR was investigated by Edelstein et al. for a spin echo (SE) and inversion recovery (IR) imaging sequence [9]. Also the data sampling period is an important parameter affecting the signal-to-noise ratio (SNR). A detailed discussion was provided by Mugler and Brookeman [10].