摘要
Purpose: To investigate the discrepancy between the arteriovenous malformations seen on magnetic resonance angiography (MRA) and on stereotactic digital subtracted angiography (DSA).
Methods and Materials: The target volume on stereotactic DSA (
V
DSA
) and the target volume on MRA (
V
MRA
) were separately delineated in 28 intracranial arteriovenous malformations. The coordinates of the center and the outer edges of
V
DSA
and
V
MRA
were calculated and used for the analyses.
Results: The standard deviations (mean value) of the displacement of centers of
V
MRA
from
V
DSA
were 2.67 mm (−1.82 mm) in the left-right direction, 3.23 mm (−0.08 mm) in the anterior-posterior direction, and 2.16 mm (0.91 mm) in the craniocaudal direction.
V
MRA
covered less than 80% of
V
DSA
in any dimensions in 9 cases (32%), although no significant difference was seen in the target volume between each method, with a mean value of 11.9 cc for
V
DSA
and 12.3 cc for
V
MRA
(
p = 0.948).
Conclusion: The shift of centers between each modality is not negligible. Considering no significant difference between
V
DSA
and
V
MRA
, but inadequate coverage of the
V
DSA
by
V
MRA
, it is reasonable to consider that the target on MRA might include the feeding artery and draining vein and possibly miss a portion of the nidus.