CORRECTION OF SPATIAL DISTORTION IN MAGNETIC-RESONANCE ANGIOGRAPHY FOR RADIOSURGICAL TREATMENT PLANNING OF CEREBRAL ARTERIOVENOUS-MALFORMATIONS

被引：76

作者：

SCHAD, LR

EHRICKE, HH

WOWRA, B

LAYER, G

ENGENHART, R

KAUCZOR, HU

ZABEL, HJ

BRIX, G

LORENZ, WJ

机构：

[1] Institute of Radiology and Pathophysiology, German Cancer Research Center, Heidelberg

[2] the Siemens Medical Division, Erlangen

[3] Department of Neurosurgery, Heidelberg University

[4] Department of Radiotherapy, Heidelberg University

来源：

MAGNETIC RESONANCE IMAGING | 1992年 / 10卷 / 04期

关键词：

TREATMENT PLANNING; BRAIN NEOPLASMS; STEREOTAXY; RADIOSURGERY; MAGNETIC RESONANCE ANGIOGRAPHY;

D O I：

10.1016/0730-725X(92)90012-O

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

A treatment planning system based on magnetic resonance (MR) angiographic imaging data for the radiosurgery of inoperable cerebral arteriovenous malformations is reported. MR angiography was performed using a three-dimensional (3D) velocity-compensated fast imaging with steady-state precession (FISP) sequence. Depending on the individual MR system, inhomogeneities and nonlinearities induced by eddy currents during the pulse sequence can distort the images and produce spurious displacements of the stereotactic coordinates in both the x-y plane and the z axis. If necessary, these errors in position can be assessed by means of two phantoms placed within the stereotactic guidance system-a "2D-phantom" displaying "pincushion" distortion in the image, and a "3D-phantom" displaying displacement, warp, and tilt of the image plane itself. The pincushion distortion can be "corrected" (reducing displacements from 2-3 mm to 1 mm) by calculations based on modeling the distortion as a fourth order 2D polynomial. Displacement, warp, and tilt of the image plane may be corrected by adjustment of the gradient shimming currents. After correction, the accuracy of the geometric information is limited only by the pixel resolution of the image (= 1 mm). Precise definition of the target volume could be performed by the therapist either directly in the MR images or in calculated projection MR angiograms obtained by a maximum intensity projection algorithm. MR angiography provides a sensitive, noninvasive 3D method for defining target volume and critical structures, and for calculating precise dose distributions for radiosurgery of cerebral arteriovenous malformations.

引用

页码：609 / 621

页数：13

共 17 条

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