Abstract
Delineation of neoplasms from normal tissue is possible using Flash sequences. These sequences prove useful in preoperative staging of bone tumours and soft tissue tumours. However, contrast between neoplastic and surrounding normal tissue is lower than in optimal selected spin-echo sequences. Flash-90 sequence is superior to Flash-10 sequence in the demonstration of intraosseous extension of predominantly sclerotic, calcified and purely fibrous tumours. In contrast, Flash-10 sequence proves superior for the demarcation of osteolytic tumours with minimal fibrous tissue content. Delineation of extraosseous tumour masses against muscle can best be achieved using Flash-90 sequence after intravenous administration of Gadolinium-DTPA. Flash-90 sequence enables sharp demarcation of extraosseous masses of bone tumours against surrounding fat, whereas Flash-10 sequence proves useful in the delineation of non-lipomatous soft tissue tumours against normal fat.
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