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
StatePublished - 1991
Externally publishedYes

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Gadolinium DTPA
Contrast Media

ASJC Scopus subject areas

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

Cite this

Paradoxically decreased signal intensity on postcontrast short-TR MR images. / Yousem, David Mark; Ihmeidan, I.; Quencer, R.; Atlas, S. W.

In: American Journal of Neuroradiology, Vol. 12, No. 5, 1991, p. 875-880.

Research output: Contribution to journalArticle

Yousem, David Mark ; Ihmeidan, I. ; Quencer, R. ; Atlas, S. W. / Paradoxically decreased signal intensity on postcontrast short-TR MR images. In: American Journal of Neuroradiology. 1991 ; Vol. 12, No. 5. pp. 875-880.
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