[Functional capacity of MRI-compatible biopsy needles in comparison with ferromagnetic biopsy needles. In vitro studies].
OBJECTIVE
Comparative evaluation of specimens obtained with different MR-compatible biopsy systems and a conventional ferromagnetic system.


METHODS
Biopsies of a pig liver were performed post-mortem with three different MR-compatible (Somatex; E-Z-EM; Daum) and one conventional biopsy system (Somatex), five with each device. The specimens were measured and the histopathological quality was graded on a scale from 0 (no tissue) to 9 (best). The tip of the needle was examined with an electron microscope before and after biopsy to demonstrate abrasion.


RESULTS
The histopathological score between the first and fifth specimen taken with one biopsy device showed no significant difference. The conventional system yielded significantly better results in nearly all categories (p < 0.05) than the MR-compatible biopsy systems. The areas of the specimens obtained with the MR-compatible biopsy systems (4.27-5.99 mm2) were significantly smaller than those from the conventional system (9.98 mm2). The needle tip abrasion of the different biopsy systems determined by electron microscopy showed no substantial difference.


CONCLUSIONS
Specimens obtained with MR-compatible biopsy systems compared to conventional biopsy systems are of lower histopathological quality. This might be caused by a smaller side notch of the MR-compatible biopsy devices. There was no difference in abrasion of the needle tip due to the softer, non-ferromagnetic alloys.
Langen
H J
HJ
Röntgenabteilung Missionsärztliche Klinik Würzburg. hj.langen@missioklinik.de
Kugel
H
H
Ortmann
M
M
Noack
M
M
de Rochemont
R M
RM
Landwehr
P
P
D000818:Animals; D001707:Biopsy, Needle / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005290:Ferric Compounds; D008099:Liver / Q000473:pathology*; D008279:Magnetic Resonance Imaging / Q000295:instrumentation*; D008854:Microscopy, Electron; D013499:Surface Properties; D013552:Swine
D005290:Ferric Compounds; C001215:ferrite
Funktionsfähigkeit MR-kompatibler Biopsienadeln im Vergleich zu ferromagnetischen Biopsienadeln. In-vitro-Untersuchungen.