MCQ -----Magnetization transfer

6.All are true regarding magnetization transfer sequences except

a.involves irradiating the tissue with off-resonance RF

b.a decrease in detectable water signal after the MTC pulse implies absence of macromolecules

c.may enhance the contrast obtained in imaging  intracerebral hemorrhage

d. may be useful in the detection of demyelination

e.useful in reducing background signals in MR angiography of the brain

6.----b

A decrease in detectable water signal after the MTC pulse implies

 a magnetization exchange, which further implies the presence of 

macromolecules. On the other hand, the absence of significant

 change in detectable water signal after the MTC pulse is applied

 implies an absence of macromolecules