title: Validation of columnar CsI x-ray detector responses obtained with hybridMANTIS, a CPU-GPU Monte Carlo code for coupled x-ray, electron, and optical transport.
abstract: OBJECTIVE
  hybridMANTIS is a Monte Carlo package for modeling indirect x-ray imagers using columnar geometry based on a hybrid concept that maximizes the utilization of available CPU and graphics processing unit processors in a workstation.
  
  
  METHODS
  The authors compare hybridMANTIS x-ray response simulations to previously published MANTIS and experimental data for four cesium iodide scintillator screens. These screens have a variety of reflective and absorptive surfaces with different thicknesses. The authors analyze hybridMANTIS results in terms of modulation transfer function and calculate the root mean square difference and Swank factors from simulated and experimental results.
  
  
  RESULTS
  The comparison suggests that hybridMANTIS better matches the experimental data as compared to MANTIS, especially at high spatial frequencies and for the thicker screens. hybridMANTIS simulations are much faster than MANTIS with speed-ups up to 5260.
  
  
  CONCLUSIONS
  hybridMANTIS is a useful tool for improved description and optimization of image acquisition stages in medical imaging systems and for modeling the forward problem in iterative reconstruction algorithms.
authors: Division of Imaging and Applied Mathematics, Center for Devices and Radiological Health, Food and Drug Administration, Silver Spring, Maryland 20993, USA.
authors: Diksha
authors: D
authors: Sharma
authors: Aldo
authors: A
authors: Badano
mesh_terms: D002586:Cesium; D003196:Computer Graphics; D003201:Computers; D004583:Electrons; D007454:Iodides; D009010:Monte Carlo Method; D055620:Optical Phenomena; D014057:Tomography, X-Ray Computed / Q000295:instrumentation*
chemical_list: D007454:Iodides; D002586:Cesium; C040050:cesium iodide