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 |
| State | 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
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 journal › Article
}
TY - JOUR
T1 - Paradoxically decreased signal intensity on postcontrast short-TR MR images
AU - Yousem, David Mark
AU - Ihmeidan, I.
AU - Quencer, R.
AU - Atlas, S. W.
PY - 1991
Y1 - 1991
N2 - 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.
AB - 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.
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M3 - Article
C2 - 1950915
AN - SCOPUS:0025998930
VL - 12
SP - 875
EP - 880
JO - American Journal of Neuroradiology
JF - American Journal of Neuroradiology
SN - 0195-6108
IS - 5
ER -