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of CT and is intended to replace conventional x-ray film in cer tain fields. Advantages are high density and contrast resolu tion, a significant reduction of radiation dose and the possibi lity of manipulating the picture. Disadvantages are low spa tial resolution and the impossibility ofdynamic studies. Digital Video Subtraction Angiography permits arteriogra phy by intravenous application ofcontrast media, but still has many drawbacks and cannot replace conventional angiogra phy to date. Nuclear Magnetic Resonance is the most important diag nostic development combining imaging and biochemical an alysis in vivo without ionising radiation.