Room: Room 207
Purpose: Neuro-endovascular image-guided interventions often make use of fine-featured devices. These devices may be made of 75 um or smaller diameter wire, and are difficult to visualize using common Flat Panel Detectors (FPDs) with pixel sizes of 150-200 um. Benefits of rapid switching between FPD and new High-Definition (HiDef) zoom modes made possible by the new detector system is demonstrated on a Canon interventional angiography biplane system using a 3D-printed vascular phantom.
Methods: To simulate the effective attenuation of a human head, an RQA5 phantom was placed in the beam before the angiography phantom. The biplane C-arm system was used to capture images in both the frontal and lateral views simultaneously. Images were captured with various zoom HiDef modes ranging from 3.0 inch to 1.5 inch FOVs, using automatic exposure control in fluoroscopic, digital angiography, and digital subtraction angiography modes.
Results: The combination of the HiDef zoom modes with the use of the biplane interventional system enabled rapid assessment of the stent deployment. Deployment of Pipeline stents in a patient-specific 3D printed angiographic phantom in particular are demonstrated. A new operational benefit comes from the convenience and rapidity of electronically switching between FPD and HiDef modes made possible by the new detector. Prior high-resolution detectors required mechanical deployment, lengthening procedure times, and potentially requiring realignment of the c-arm, further increasing procedure times and patient dose. Use of the new biplane system also allows a larger FOV in an FPD mode to track the procedure from either lateral or frontal views while the smaller FOV in a HiDef mode visualizes the intervention in greater detail over a smaller ROI.
Conclusion: Use of the novel detector biplane system should enable rapid, more precise treatment with neuro-endovascular devices by use of rapid switching between zoom modes in both frontal and lateral views.
Funding Support, Disclosures, and Conflict of Interest: This work was supported in part by Canon Medical Systems Corporation
High-resolution Imaging, Flat-panel Imagers