3a) Basic Acquisition Parameters – Acquisition Time
Most of the time, users only change number of scans. But in some cases you may need to adjust other acquisition parameters, for example number of acquired points or acquisition time. This video shows why it is important to collect enough points, and shows common artifacts that appear when you fail to collect enough data.
3b) Basic Acquisition Parameters – Excitation Pulse and Number of Scans
This video goes through two basic acquisition parameter, number of scan averages and excitation pulse / tip angle. You will learn how signal to noise scaless as the square-root of the number of scans (ie, to double your S/N you must quadruple your number of scans). Also, controlling the tip angle (excitation pulse) can control how much signal is acquired for each scan. In many cases, using a smaller excitation pulse will enable cleaner integrations, since your signals can return to equilibrium more quickly. See later video for measuring 90 and 180 degree pulse lengths, and measuring T1 relaxation parameters, for a better understanding.
