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OCR: oton The strength of the signal depends on p und T2. T1 density and on two relaxation times, T1 return to depends on the time the protons take to ends on thethe axis of the magnetic field and T2 dep reighted time the protons take to dephase. A T1-1 en tissues image is one in which the contrast betw erties is mainly due to their T1 relaxation prop et is due to while in a T2-weighted image the contra the T2 relaxation properties, Routinely, ind after T1-weighted images are obtained before intravenous contrast administration of gadolinium chelate (i.e. gadopentatate obtained dimeglumine). T2-weighted images are when further tumour delineation or are characterisation is felt necessary: images es. acquired in the coronal and sagittal plan