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) |
|---|---|
| Pages (from-to) | 875-880 |
| Number of pages | 6 |
| Journal | American Journal of Neuroradiology |
| Volume | 12 |
| Issue number | 5 |
| Publication status | Published - 1991 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Clinical Neurology
- Radiology Nuclear Medicine and imaging
- Radiological and Ultrasound Technology
Cite this
Yousem, D. M., Ihmeidan, I., Quencer, R., & Atlas, S. W. (1991). Paradoxically decreased signal intensity on postcontrast short-TR MR images. American Journal of Neuroradiology, 12(5), 875-880.