TH‐A‐217BCD‐10: Feasibility of Performing 2D Mammography Using CNT Source Array Designed for Tomosynthesis

Abstract

Purpose: Digital breast tomosynthesis (DBT) is the top rival of 2D mammography. Two common approaches to DBT are continuous and step‐and‐shoot tube motion; presenting problems with source motion blur and long scan time, respectively. Stationary DBT (s‐DBT) has the potential to overcome both issues. We recently developed an s‐DBT scanner utilizing a CNT (carbon nanotube) x‐ray source array, and demonstrated its enhanced spatial resolution and faster scanning speed. This work explores the possibility of expanding the capabilities of current CNT s‐DBT technology to 2D mammography when necessary. Methods: A testing chamber was configured to mimic the most recent iteration of the s‐DBT technology. Simulations of heat loading on the tungsten anode were conducted to predict the maximum power the anode could withstand. The minimum goal was to test if a single CNT cathode could output 50mAs in 4s, giving similar exposure of one traditional 2D view. Further testing explored the current limits of the cathodes. Results: Results show that a single CNT cathode can easily reach the minimum requirement for a 2D mammography image and can reliably administer up to 50mAs with a 3 second pulse width at 35kVp, which is an equivalent exposure to one 2D mammography image. Conclusions: A single CNT cathode in the electrode configuration of the current s‐DBT design can successfully administer enough current to perform a 2D mammography screening image. The heat loading on the anode was sufficient for this purpose, with the limiting factor being the current design of the CNT cathodes. This work is supported by the National Cancer Institute through the Carolina Center for Cancer Nanotechnology Excellence under grant number U54CA119343 and R01CA134598, the Lineberger Comprehensive Cancer Center and University Cancer Research Fund at UNC