Evaluation of carbon nanotube x‐ray source array for stationary head computed tomography

Purpose Stationary computed tomography (s-CT) conceptually offers several advantages over existing rotating gantry-based CT. Over the last 40 yr, s-CT has been investigated using different technological approaches. We are developing a system specifically for head/brain imaging carbon nanotube (CNT)-based field emission x-ray source array technology. The noncircular geometry requires assessment approaches as compared to circular geometries. purpose of present study is investigate whether CNT meets requirements stationary head CT (s-HCT). Methods Multiple prototype arrays were manufactured based on obtained from simulation. Source characterization was performed benchtop setup consisting an with 45 distributed focal spots, each operating at 120 kVp, and electronic control (ECS) high speed output individual spots. Due forward-angled linear anode, projected spot shape expected vary wide angle views. A pinhole method implemented determine effective size (FSS) in plane range angular viewpoints flat panel detector. spectrum half value layer (HVL) also evaluated viewing angles characterize beam quality across fan-beam. Dosimetry simulated scan evaluate total exposure. Results demonstrated adequate specifications s-HCT machine. operated kVp long-term stability full year regular laboratory use. cathode current measurements used confirm submicrosecond accuracy regards exposure time subsequently dose control. All spots measured average 1.26 (±0.04) mm × 1.21 (±0.03) (equivalent IEC 1,0). found be appropriately filtered sources rotary systems. stable reliable 0.04 mAs per emitter resulting 0.015 mGy projection observed months rigorous phantom imaging. Dose regulated by ECS ±0.5% tolerance. Conclusions meet proposed scanner, regard FSS, quality, precision. remaining challenges related overall design nonrotating scanner sources. next phase project will incorporate multiple multirow detectors proof-of-concept analysis fully functional system.