Distortion inherent to magnetic resonance imaging can lead to geometric miss in radiosurgery planning.

ABSTRACT:

Purpose

Anatomic distortion is present in all magnetic resonance imaging (MRI) data because of nonlinearity of gradient fields; it measures up to several millimeters. We evaluated the potential for uncorrected MRI to lead to geometric miss of the target volume in stereotactic radiosurgery (SRS).

Methods and materials

Twenty-eight SRS cases were studied retrospectively. MRI scans were corrected for gradient nonlinearity distortion in 3 dimensions, and gross tumor volumes (GTVs) were contoured. The manufacturer-specified distortion field was then reapplied to GTV masks to allow measurement of GTV displacement in uncorrected images. The uncorrected GTV was used for SRS planning, and the dose received by the true (corrected) GTV was measured.

Results

Median displacement o

SUBMITTER: Seibert TM 

PROVIDER: S-EPMC5099096 | biostudies-literature | 2016 Nov - Dec

REPOSITORIES: biostudies-literature