AJDRAJNR - American Journal of Neuroradiology

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American Journal of Neuroradiology, Vol 12, Issue 5 875-880, Copyright © 1991 by American Society of Neuroradiology

ARTICLES

Paradoxically decreased signal intensity on postcontrast short-TR MR images

DM Yousem, I Ihmeidan, R Quencer and SW Atlas
Department of Radiology, Neuroradiology Section, Hospital of the University of Pennsylvania, Philadelphia 19104.

Seven lesions are presented in which short TR/short TE images obtained immediately after IV administration of gadopentetate dimeglumine demonstrated an apparent decrease in signal intensity compared with precontrast short TR/short TE images. All seven lesions were hyperintense on precontrast short TR/short TE images. In four cases in which long TR/long TE scans were also obtained, the lesions were hypointense. This phenomenon may be due to a dominant T2 shortening effect by the contrast material that "overwhelms" T1 shortening even on short TR/short TE scans. Other compounding factors may include variations in scanning variables, receive and transmit attenuations, or a photographic phenomenon due to window widths and center levels.




Copyright © 2008 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X