preparation rf module when sampling a central region of k space during the readout procedure the image set is reconstructed into an image of the vascular structure wherein blood within the vascular structure is reflected as a gray blood image application_number US 201313782658 A description referring particularly to fig1 an example of a magnetic resonance imaging u201c mri u201d system 100 is illustrated the workstation 102 includes a processor 108 such as a commercially available programmable machine running a commercially available operating system the workstation 102 provides the operator interface that enables scan prescriptions to be entered into the mri system 100 the workstation 102 is coupled to four servers a pulse sequence server 110 a data acquisition server 112 a data processing server 114 and a data store server 116 the workstation 102 and each server 110 112 114 and 116 are connected to communicate with each other the pulse sequence server 110 functions in response to instructions downloaded from the workstation 102 to operate a gradient system 118 and a radiofrequency u201c rf u201d system 120 gradient waveforms necessary to perform the prescribed scan are produced and applied to the gradient system 118 which excites gradient coils in an assembly 122 to produce the magnetic field gradients gx gy and gz used for position.