, ▁ 1 3 1 I ▁ ▁Fl u or ine - 1 8 , ▁ 1 8 F ▁ ▁Te ch net ium - 9 9 m , ▁ 9 9 m T c ▁ ▁Co pper - 6 4 , ▁ 6 4 C u ▁ ▁In ▁P ET ▁the ▁is ot op es ▁flu or ine - 1 8 , ▁carbon - 1 1 , ▁and ▁co pper - 6 4 ▁are ▁often ▁used ▁in ▁mole cular ▁imag ing . ▁ ▁List ▁of ▁radi ol ig ands ▁▁ ▁Rad i ol ig ands ▁may ▁be ▁constructed ▁to ▁bind ▁select ively ▁to ▁a ▁particular ▁neur ore ceptor ▁or ▁a ▁particular ▁ne uro trans mit ter ▁trans porter . ▁ ▁Ex amples ▁of ▁radi ol ig ands ▁include : ▁▁▁ 1 1 C - WA Y - 1 0 0 6 3 5 ▁for ▁the ▁ 5 - HT 1 A ▁re ceptor ▁ ▁N ( 1 )- ([ 1 1 C ] - m eth yl )- 2 - Br - L SD ▁([ 1 1 C ] - MB L ) ▁for ▁ 5 - HT 2 ▁re cept ors ▁▁▁ 1 8 F - alt ans er in ▁and ▁ 1 8 F - set oper one ▁for ▁the ▁ 5 - HT 2 A ▁re ceptor ▁▁▁ 1 1 C - ket ans er in ▁and ▁tr iti ated ▁k et ans er in ▁▁ 1 1 C - DA SB ▁for ▁the ▁ser ot on in ▁trans