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 language | English (US) |
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Pages (from-to) | 875-880 |
Number of pages | 6 |
Journal | American Journal of Neuroradiology |
Volume | 12 |
Issue number | 5 |
State | Published - Jan 1 1991 |
Externally published | Yes |
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging
- Clinical Neurology