Games usually have a goal that a player aims to achieve. Early board games represented a battle between two armies, and most modern board games are still based on defeating opponents in terms of counters, winning position, or accrual of points. There are many varieties of board games.
MRIs also notice the strength of these radio signals. Where there is a lot of water, for example in muscle, the signal is strong, and where there is less water, for example in bone, the signal is weak. The different strengths of the radio waves enable the MRI to fill in the image with the proper shades of gray.An MRI is noisy because its magnetic field is created by running electrical current through a coiled wireâan electromagnet. When the current is switched on, there is an outward force all along the coil.And because the magnetic field is so strong, the force on the coil is very large.he frequency of the proton's radio wave is determined by its wobbling rate; so the protons in water emit a radio frequency of about 50 million cycles per second. The heart of an MRI is basically just a strong magnet and a radio transmitter and receiver, plus a lot of electronics to coordinate their operation.
A single scan may take from a few seconds to three or four minutes. You may be asked to hold your breath during short scans. Depending on the size of the area being scanned and how many images are taken, the whole procedure will take 15 to 90 minutes.The MRI scanner will make loud tapping noises at certain times during the procedure. This is the electric current in the scanner coils being turned on and off.epending on the size of the area being scanned and how many images are taken, the whole procedure will take 15 to 90 minutes. The MRI scanner will make loud tapping noises at certain times during the procedure.