Q.All are true regarding intracranial tumour except
a. Fat-containing neoplasms are teratoma and dermoid
b. chemical shift artifact is big hurdle in detecting presence of fat in tumour
c. Fat-selective suppression methods –useless in the
distinction of etiologies of hyperintense tumors on T1W
d. Melanin in tumors is seen as high intensity on
T1W and intermediate intensity on T2W
e. fat is hyperintense on T1W and intermediate
intensity on conventional T2W
ANS.---c
Chemical shift artifact provides
clue to the presence of fat in tumour. This artifact is displayed as a region of signal
void at fat–water interfaces and hyperintensity at water–fat interfaces along the frequency-encoding axis .
Fat-selective suppression methods can
play a role in the distinction of etiologies of hyperintense tumors on
T1-weighted images.
No comments:
Post a Comment