Implanon implant detection with ultrasound and magnetic resonance imaging.
OBJECTIVE
The objective of the present study was to determine the degree of difficulty in locating Implanon (Organon, Sydney, Australia) contraceptive rods which had been inserted suboptimally, using both ultrasound and magnetic resonance imaging (MRI).


METHODS
Volunteers with correctly placed Implanon rods were recruited for normal scanning protocols. A phantom was used to display abnormal rod placements. Ultrasound imaging was carried out using a variety of transducers to demonstrate their suitability. An MRI scanning protocol was formulated to achieve required views in the shortest time.


RESULTS
All Implanon rods were successfully imaged with both ultrasound and MRI.


CONCLUSIONS
High resolution linear array transducers combined with the correct scanning protocol should enable visualisation of Implanon rods in almost all cases. The MRI imaging requires caution when differentiating blood vessels and fibrous septae from the Implanon rods.
Westerway
Susan Campbell
SC
North Shore Obstetric and Gynaecologic Ulltrasound, North Shore Private Hospital, St Leonards, New South Wales, Australia. nsogus@ram.net.au
Picker
Richard
R
Christie
James
J
D017135:Desogestrel / Q000008:administration & dosage; D004343:Drug Implants / Q000008:administration & dosage*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D018482:Muscle, Skeletal / Q000000981:diagnostic imaging* / Q000473:pathology*; D045167:Progesterone Congeners / Q000008:administration & dosage; D012680:Sensitivity and Specificity; D040521:Subcutaneous Tissue / Q000000981:diagnostic imaging* / Q000473:pathology*; D014463:Ultrasonography
D004343:Drug Implants; D045167:Progesterone Congeners; C044815:etonogestrel; D017135:Desogestrel