Bone-Subtracted Spinal CT Angiography Using Nonrigid Registration for Better Visualization of Arterial Feeders in Spinal Arteriovenous Fistulas

Abstract

BACKGROUND AND PURPOSE: Pretreatment diagnosis for the location of shunts and arterial feeders of spinal arteriovenous fistulas is crucial. This study aimed to evaluate the utility of subtracted CT angiography imaging by using nonrigid registration (R-CTA) in patients with spinal arteriovenous fistulas compared with conventional CTA imaging.

Advantages of 70-kV CT Angiography for the Visualization of the Adamkiewicz Artery: Comparison with 120-kV Imaging

“…3,26 The proximity between the AKA (or the collateral supply from the CSA) and the vertebral bone cortex makes the evaluation of continuity of the AKA or correct identification of the CSA challenging and time-consuming in spinal CTA. 27 However, due to the improvement of CNR ASA-Bone in 70-kV CTA, the continuity score was significantly higher than with 120-kV CTA. The accuracy of detection of the CSA was also improved in 70-kV CTA, especially when there was a collateral pathway to the AKA.…”

Angio Cone-Beam CT (Angio-CBCT) and 3D Road-Mapping for the Detection of Spinal Cord Vascularization in Patients Requiring Treatment for a Thoracic Aortic Lesion: A Feasibility Study

“…The rate for vascular continuity has been reported to be in the range of 25 to 60% for 16-or 64-detector row CT [12,14,15,17]. The difficulty in demonstrating continuity can be attributed to the small size of the artery and the proximity to the spine [37]. It is also important to emphasize that many studies have been conducted in different ethnic groups [10,23,28], whose physical characteristics differ from our population.…”

3D reconstructions, 4D imaging and postprocessing with CT in musculoskeletal disorders: Past, present and future

“…Generally, to form the mask, the bone structure segmentation is obtained by thresholding of the precontrast images; then, the selection is tentatively expanded in three dimensions by morphological dilation. The subtraction of this mask from the postcontrast images is based on a rigid or a nonrigid registration and an adaptive determination of the optimal contact interface between vessels and the bone mask [53,55]. This technique is particularly well suited for large-detector CT scanners, which can acquire an entire volume of interest with perfect temporal uniformity [56].…”