Verification of a hybrid adjoint methodology in TITAN for single photon emission computed tomography

Katherine Royston, Alireza Haghighat, Ce Yi

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The hybrid deterministic transport code TITAN is being applied to a Single Photon Emission Computed Tomography (SPECT) simulation of a myocardial perfusion study. The TITAN code's hybrid methodology allows the use of a discrete ordinates solver in the phantom region and a characteristics method solver in the collimator region. Currently we seek to validate the adjoint methodology in TITAN for this application using a SPECT model that has been created in the MCNP5 Monte Carlo code. The TITAN methodology was examined based on the response of a single voxel detector placed in front of the heart with and without collimation. For the case without collimation, the TITAN response for single voxel-sized detector had a -9.96% difference relative to the MCNP5 response. To simulate collimation, the adjoint source was specified in directions located within the collimator acceptance angle. For a single collimator hole with a diameter matching the voxel dimension, a difference of -0.22% was observed. Comparisons to groupings of smaller collimator holes of two different sizes resulted in relative differences of 0.60% and 0.12%. The number of adjoint source directions within an acceptance angle was increased and showed no significant change in accuracy. Our results indicate that the hybrid adjoint methodology of TITAN yields accurate solutions greater than a factor of two faster than MCNP5.

Original languageEnglish
Title of host publicationInternational Conference on the Physics of Reactors 2010, PHYSOR 2010
PublisherAmerican Nuclear Society
Pages3462-3474
Number of pages13
ISBN (Print)9781617820014
StatePublished - 2010
Externally publishedYes
EventInternational Conference on the Physics of Reactors 2010, PHYSOR 2010 - Pittsburgh, United States
Duration: May 9 2010May 14 2010

Publication series

NameInternational Conference on the Physics of Reactors 2010, PHYSOR 2010
Volume4

Conference

ConferenceInternational Conference on the Physics of Reactors 2010, PHYSOR 2010
Country/TerritoryUnited States
CityPittsburgh
Period05/9/1005/14/10

Keywords

  • Adjoint
  • Deterministic
  • Monte Carlo
  • SPECT

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