E. Coste et al., 3D reconstruction of the encapsulating contour of arteriovenous malformations for radiosurgery using digital subtraction angiography, INT J RAD O, 50(1), 2001, pp. 247-255
Citations number
26
Categorie Soggetti
Radiology ,Nuclear Medicine & Imaging","Onconogenesis & Cancer Research
Journal title
INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS
Purpose: Treatment planning for radiosurgery depends on the precise definit
ion of radiation target volumes. For vascular pathologies such as arteriove
nous malformations (AVM), the most usual technique remains standard X-ray p
rojection imaging, most often carried out under stereotactic conditions. To
further benefit from the advantages of two-dimensional digital subtraction
angiography (DSA), the authors have developed a method for determining the
three-dimensional shape of arteriovenous malformations from two views.
Methods and Materials: After correction of image intensifier distortion and
calibration of both views, the 3D shape of the AVM was determined from two
DSA projections using epipolarity geometry, The AVM-encapsulating contour
was modeled by triangulation of a stack of almost parallel ellipses. The me
thod was technically validated using artificial targets in a skull phantom,
Clinical validation was carried out on 10 patients who were examined using
both conventional angiography under stereotactic conditions (SX-ray) and D
SA,
Results: There was excellent agreement between the artificial target volume
s measured with SX-ray and with DSA, The correspondence between AVM volumes
found for patients was not as good as with the phantom,
Conclusions: The different image characteristics of the two modalities lead
to some differences in AVM estimations. However, the results were sufficie
ntly satisfactory to justify routine use of this AVM modeling technique for
radiosurgery planning. (C) 2001 Elsevier Science Inc.