Comparing two approaches to rigid registration of three-dimensional ultrasound and magnetic resonance images for neurosurgery

Abstract

The results show that the pseudo-US rigid registration technique robustly improves the MRI-ultrasound alignment when compared with the initial alignment, even when applied to highly distorted brains and a large range of tumor sizes and appearances.

Hybrid Ultrasound/Magnetic Resonance Simultaneous Acquisition and Image Fusion for Motion Monitoring in the Upper Abdomen

“…9,10 Ultrasound and MR image coregistration was first reported using separate acquisitions at different times. 9,28,29 Sequential imaging increases the total duration of acquisition and does not enable in situ image fusion, making this approach less desirable in clinical practice. Registering offline US and MR images 30Y32 is, in general, difficult because each image contains features that are not necessarily observable in the other modality.…”

Deformable registration of preoperative MR, pre-resection ultrasound, and post-resection ultrasound images of neurosurgery

“…To estimate T 1←3 using the compositional approach, we first use RaPTOR to estimate T 1←2 . Using the landmarks provided in the BITE database [19], we quantify the registration accuracy (see Table 1). The initial mean mTRE is 4.1 mm, which is reduced to 2.4 mm after the registration.…”

“…A disadvantage of this work is that a polynomial functional relationship is assumed between MR and US intensities, and therefore, an interesting area of future work is to extend this method to the estimation of nonparametric functional relationship. The work of Arbel et al [29], Mercier et al [19], and Kuklisova-Murgasova et al [31] transforms the multimodal registration problem to a unimodal one, and hence enables the use of well-established and computationally efficient uni-modal registration methods. A disadvantage is that the presence of pathology can render US simulation from the MR volume challenging.…”

“…Tracked intra-operative ultrasound (US), however, is inexpensive and does not require significant changes to the OR or operating procedure. In neurosurgery, intra-operative US has been used in imaging tumor resection and epilepsy surgery [12][13][14][15][16][17][18][19][20] and placement of cerebral ventricle catheters [21] for example.…”

“…Roche et al [28] performed a parametric polynomial fit of US intensity as a function of MR and its gradient to construct a functional correlation ratio similarity metric. Arbel et al [29] and Mercier et al [19] segmented the MR image and assigned different intensity transforma- (1) We develop a group-wise registration algorithm that considers the MR volume and the two US volumes simultaneously to estimate the transformation between the MR and postoperative US volumes. We use the pair-wise registration algorithms of [26,27] to develop the group-wise algorithm.…”