CatSim: a new computer assisted tomography simulation environment

Man, Bruno De; Basu, S.; Chandra, Naveen; Dunham, Bruce; Edic, Peter M.; Iatrou, Maria; McOlash, S.; Sainath, Paavana; Shaughnessy, Charlie; Tower, Brendon; Williams, Eugene

doi:10.1117/12.710713

Cited by 105 publications

(79 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study, a code based on hybrid modeling approach [6,7] has been further developed to model diffi'active scattering considering multiple collimation schemes. The user can choose between point-like or extended sources; the photons are propagated to a mathematical phantom via pencil beam, fan beam or cone beam illumination and can be further collimated through a user-defmed aperture or aperture array placed at various distances between the source and the phantom.…”

Section: A the Simulation Codementioning

confidence: 99%

Modeling scattering for security applications: A multiple beam X-Ray Diffraction Imaging system

Cozzini¹,

Olesinski

Harding

2012

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC)

View full text Add to dashboard Cite

In the past decades several authors have demonstrated the ability of X-Ray Diffraction Imaging (XDI) in providing spatial and material specific information about the object under investigation [I]. Energy Dispersive X-Ray Diffraction (EDXRD) systems detect diffraction patterns by using a polychromatic spectrum and measuring the coherently scattered beam at a specific angle. This type of molecular-specific information plays a key role in security screening modalities providing high detection as well as low false alarm rates [2]. In the past, one of the main limitations to the widespread use of this technology in airport screening was the slow scanning rate compared to conventional systems. With the advent of novel system topologies such as the 3rd Generation energy-dispersive XDI configurations [3], this issue can be overcome [4].In the present work a simulation tool accounting for molecular interference and providing multiple collimation configuration options has been validated with a single source dual-channel geometry. The primary-scatter and cross-scatter signals generated by two neighboring voxels have been studied here, analyzing both coherent and incoherent scatter contributions; and a method for a first order material independent cross-scatter correction has been evaluated. The tool has then been applied for first investigations of a Multiple Inverse Fan Beam (MIFB) concept.

show abstract

Section: A the Simulation Codementioning

confidence: 99%

Modeling scattering for security applications: A multiple beam X-Ray Diffraction Imaging system

Cozzini¹,

Olesinski

Harding

2012

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC)

View full text Add to dashboard Cite

show abstract

“…We used the Computer Assisted Tomography SIMulator (CATSIM) for the simulation of the air scan and the patient scan [16]. The CATSIM simulation tool models the x-ray spectrum, the geometry of the tube rotation, the material and geometry of the bowtie filter, the x-ray transmission and detection process.…”

Section: Phantom Simulation Studymentioning

confidence: 99%

“…The CATSIM simulation tool models the x-ray spectrum, the geometry of the tube rotation, the material and geometry of the bowtie filter, the x-ray transmission and detection process. The quality of CATSIM simulations has been validated via a series of phantom measurements in terms of the x-ray spectrum, noise property (including electronic noise), and scattering profile on a commercial CT scanner (LightSpeed VCT, GE Healthcare, Waukesha, WI) [16]. The Monte Carlo simulation was performed using simulation software (CATDOSE, GE Healthcare, Waukesha, WI) [16].…”

Section: Phantom Simulation Studymentioning

confidence: 99%

“…The quality of CATSIM simulations has been validated via a series of phantom measurements in terms of the x-ray spectrum, noise property (including electronic noise), and scattering profile on a commercial CT scanner (LightSpeed VCT, GE Healthcare, Waukesha, WI) [16]. The Monte Carlo simulation was performed using simulation software (CATDOSE, GE Healthcare, Waukesha, WI) [16]. A series of mathematical phantom simulation were performed to ascertain the feasibility of the projection-based dose metric across a broad range of patient sizes, patient anatomy, and scanning parameters.…”

Section: Phantom Simulation Studymentioning

confidence: 99%

See 1 more Smart Citation

Estimation of Radiation Dose in CT Based on Projection Data

et al. 2016

Self Cite

View full text Add to dashboard Cite

Managing and optimizing radiation dose has become a core problem for the CT community. As a fundamental step for dose optimization, accurate and computationally efficient dose estimates are crucial. The purpose of this study was to devise a computationally efficient projection-based dose metric. The absorbed energy and object mass were individually modeled using the projection data. The absorbed energy was estimated using the difference between intensity of the primary photon and the exit photon. The mass was estimated using the volume under the attenuation profile. The feasibility of the approach was evaluated across phantoms with a broad size range, various kVp settings, and two bowtie filters, using a simulation tool, the Computer Assisted Tomography SIMulator (CATSIM) software. The accuracy of projectionbased dose estimation was validated against Monte Carlo (MC) simulations. The relationship between projectionbased dose metric and MC dose estimate was evaluated using regression models. The projection-based dose metric showed a strong correlation with Monte Carlo dose estimates (R 2 > 0.94). The prediction errors for the projection-based dose metric were all below 15 %. This study demonstrated the feasibility of computationally efficient dose estimation requiring only the projection data.

show abstract

“…To model diffractive scattering, however, a straightforward MC approach would be computationally very inefficient. Therefore data were generated using an extension of the CT simulation software CATSIM [4], which includes scatter simulation (CATSCATTER). The methods used in the CATSCATTER tool are based on a hybrid modeling approach where first a number N of photons are used to estimate the scatter field within the object being scanned.…”

Section: A the Hybrid Monte Carlo Approachmentioning

confidence: 99%

Energy dispersive X-ray diffraction spectral resolution considerations for security screening applications

Cozzini¹,

Harding

Edic

et al. 2010

IEEE Nuclear Science Symposuim &Amp; Medical Imaging Conference

View full text Add to dashboard Cite

Energy dispersive X-ray diffraction (EDXRD) is a very effective method for explosive and narcotic threat detection in baggage screening. The XRD profiles arise from the molecular interference when X-rays are coherently scattered by a substance. The accurate identification of the target material depends on the ability to detect and resolve the peaks present in the coherent scatter profiles. A high-energy resolution High Purity Germanium (HPGe) detector is therefore generally used in such type of systems. To evaluate the suitability of costeffective room-temperature semiconductor detectors for nextgeneration baggage screening systems, an assessment of the minimal requirements for the system resolution is required.In this study a hybrid Monte Carlo code has been modified to account for the molecular interference function that gives rise to the coherent scatter signature. A model for a realistic response function for Cadmium Zinc Telluride (CZT) detectors is then used to convolve the spectral output. This simulation tool is then used to assess the system design features and their influence on spectral resolution.

show abstract

CatSim: a new computer assisted tomography simulation environment

Cited by 105 publications

References 0 publications

Modeling scattering for security applications: A multiple beam X-Ray Diffraction Imaging system

Modeling scattering for security applications: A multiple beam X-Ray Diffraction Imaging system

Estimation of Radiation Dose in CT Based on Projection Data

Energy dispersive X-ray diffraction spectral resolution considerations for security screening applications

Contact Info

Product

Resources

About