MRI is an useful technique for medical diagnosis. However it is not accessible in specific occasions, such as in an ambulance, in intensive care units (ICU) or in remote areas because of its heavy weight and strict environmental requirements. Recently, several research groups have been developing portable MRI scanners and achieved crude 2-D images using rotating inhomogeneous magnetic field for spatial encoding. However, there are some aspects that could be improved. For example, for just constructing 2-D image, the measurement time is long due to the single channel receiver and low transmission speed for large volume data. The purpose of this project is to build a complete movable MRI system using an inhomogeneous magnetic field and address those problems by redesigning the hardware. 3-D imaging will be realized by adding TRansmit Array Spatial Encoding-TRASE coils, parallel imaging will be achieved through using quad-channel receivers and high speed transmission will be fulfilled by using Peripheral Component Interconnect Express (PCIe). In addition to the creative ideas,to build a whole MRI system scanner, some other integral parts need to be considered as well. For example, excitation and refocus pulses for inhomogeneous magnetic field will be researched by referring to the experience in single-sided NMR, such as mobile universal surface explorer (MOUSE) and NMR logging apparatus in which the magnetic field is also inhomogeneous.