Paradoxically decreased signal intensity on postcontrast short-TR MR images

David Mark Yousem, I. Ihmeidan, R. Quencer, S. W. Atlas

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish (US)
Pages (from-to)875-880
Number of pages6
JournalAmerican Journal of Neuroradiology
Volume12
Issue number5
Publication statusPublished - 1991
Externally publishedYes

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ASJC Scopus subject areas

  • Clinical Neurology
  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

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