X-Ray Video Imaging Quality Assessment Device
del Carmen, Chandler J.
Gitzel, Quinton E.
Yang, Alex (Shuo)
The Imaging Physics department at CancerCare Manitoba is seeking to conduct an investigation pertaining to the image and frame quality produced in Fluoroscopy, a modality of xray imaging which captures multiple frames per second and sequences them into a video. Previously, a metronome was used in such an investigation, but proved insufficient due to the metronome’s momentum varying over time. Thus, for the purpose of identifying Fluoroscopy frame issues which include missed, duplicated, averaged, or split frames, a specialized device was commissioned whose primary feature is a periodically repeating pattern which can be imaged by the fluoroscope, such that it is clearly disrupted at the instance of any of these frame issues. The design team incorporated spiral geometry rotating at 60 [rpm], in order for the pattern to be continuous, as well as vary both angularly and radially, producing a unique image for each frame captured within a second-long cycle. The spiral takes up an area of 20 [cm] in diameter, maximizing the use of the area captured by the fluoroscope’s image intensifier. The spiral is mounted directly onto a NEMA 6 Bipolar stepper motor, providing high precision at relatively low speeds, which eliminates the need for a drive mechanism and simplified the design. The rotation of the motor is controlled by an Arduino Uno – R3 control board and an Easy Driver – Stepper Motor Driver, all powered by a pair of 18650 Lithium Ion rechargeable batteries, providing a charge of up to 5.2 [hr] and a total lifespan of 300 charge cycles. All of these components are enclosed in an acrylic housing in order to prevent unnecessary user tampering, protect the components from any damage, and ensure appropriate visibility of the spiral when imaged by the fluoroscope. The enclosed assembly is mounted on a tripod to allow for height adjustability for compatibility with a variety of fluoroscope models. The submission of this report marks the conclusion of the design phase of this project, with the prototype and testing phase officially commencing on January 6th, 2020. To prepare, included in the report are a cost analysis totaling at $435.94 CAD […]