The imaging potential of the MR experiment continues to evolve. In recent years, an increasing number of fast and ultrafast imaging strategies has been described. In this evolu tion the definition of the terms fast and ultrafast has been blurred. Hence they are frequently used interchangeably. The evolution of these methods has been based on two related, yet separate developments: an increasingly thorough understand ing of the complexities inherent to pulse sequence design and the increasing availability of stronger and faster gradient sys tems. The combination of these two factors has laid...

One of the most amazing and spectacular developments in modern radiology has been the rapid growth and expansion of so-called interventional radiology, which can also be described as minimally invasive therapy guided by radiological imaging. Many applications of this method are now widely in use in different organs, particularly in the vascular system. Everybody is well aware of the shortcomings and drawbacks of the radiological modalities currently used for guiding minimally invasive procedures. Ultrasound, although it has the advantage of being absolutely harmless to the patient and the...