Room: Room 207
Purpose: To investigate and demonstrate the ultra-high frame rate capability of a PCD for potential use in imaging high vascular flow rates and device motion blur.
Methods: Photon counting in contrast to energy integration, involves counting individual photons incident on the detector. In addition to increased spatial resolution due to small pixels and better contrast resolution due to dual energy threshold acquisition, certain PCDs are capable of high frame rate imaging. An XCounter Actaeon PCD with 100 Âµm pixel pitch, 0.75 mm thick CdTe and 250 fps acquisition speed was used to image the rotating motor (angular velocity 180 deg/s) within the NEMA Cardiology Phantom unit such that two wires of 400 and 500 Âµm diameter were mounted on the motor and imaged with the Actaeon. The thresholds for dual energy acquisition were set at 20 and 60 keV respectively for the lower and upper windows, using the most sensitive imaging mode with built in anti-charge sharing correction. For the first set of measurements, the Actaeon was synchronously triggered at low frame rates for a range of x-ray pulse duration and for the second set, the detector was triggered independently at variable high frame rates with the x-rays in continuous fluoroscopy mode. ImageJ toolbox was used to measure the width of wire segments at identical sections and then plotted to show blur extent.
Results: The effect of pulse width in reducing/increasing the object blur have been demonstrated at lower frame rates. Higher frame rate imaging reduced the motion blur for the wires; with increasing frame rates, the images demonstrated little blur.
Conclusion: High frame-rate imaging capability of the Acateon PCD was demonstrated. Such capability may be applicable in clinical settings such as in cardio-vascular procedures to monitor high flow rates and device motion blur.
Funding Support, Disclosures, and Conflict of Interest: This research was supported in part by Canon Medical Systems Corporation