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Evaluation of accuracy in activity calculations for the conjugate view method from monte carlo simulated scintillation camera images using experimental data in an anthropomorphic phantom.

Jönsson, Lena M LU ; Ljungberg, Michael LU and Strand, Sven-Erik LU (2005) In Journal of Nuclear Medicine 46(10). p.1679-1686
Abstract
Activity determination from scintillation camera images using the conjugate view method may be inaccurate because of variation in scattered radiation from adjacent organs and activity from overlapping tissues. The aim of this study was to simulate patient scintillation camera images and from these evaluate the accuracy of 2 correction methods. The contribution from overlapping tissue activity was also calculated for some organs. Methods: Biokinetic data for Tc-99m-sestamibi obtained in rats was used as input to simulate scintillation camera images with a voxel-based computer phantom using the Monte Carlo method. The organ activity was calculated using the conjugate view method with either the effective attenuation coefficient method or... (More)
Activity determination from scintillation camera images using the conjugate view method may be inaccurate because of variation in scattered radiation from adjacent organs and activity from overlapping tissues. The aim of this study was to simulate patient scintillation camera images and from these evaluate the accuracy of 2 correction methods. The contribution from overlapping tissue activity was also calculated for some organs. Methods: Biokinetic data for Tc-99m-sestamibi obtained in rats was used as input to simulate scintillation camera images with a voxel-based computer phantom using the Monte Carlo method. The organ activity was calculated using the conjugate view method with either the effective attenuation coefficient method or scatter correction using the triple-energy window (TEW) method combined with attenuation correction with a transmission factor image. Images were simulated with activity in organs one by one to evaluate the accuracy of the 2 correction methods and to evaluate the activity contribution from activity in adjacent or overlapping tissues. To allow comparison with the clinical situation, the total activity distribution from the animal study was used to simulate scintillation camera images at different points in time and the calculated activity was compared with both the input data and some patient data from the literature. Results: The combination of scatter and attenuation correction gave the most accurate calculated activity, +/- 10% of the true activity from the images with activity in one organ at a time. In the images similar to the clinical situation, the kidney activity was overestimated up to a factor of 34, mainly because of excretion of activity through the intestines. Conclusion: The scatter correction using the TEW method in combination with attenuation correction with the measured transmission factor resulted in the most accurate activity determination of the methods used. This study also shows that organ activity data calculated from scintillation camera images may be overestimated by >90% because of activity in overlapping tissues. (Less)
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author
organization
publishing date
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Contribution to journal
publication status
published
subject
keywords
conjugate view method, Monte Carlo simulations, activity, quantification, scintigraphy, sestamibi
in
Journal of Nuclear Medicine
volume
46
issue
10
pages
1679 - 1686
publisher
Society of Nuclear Medicine
external identifiers
  • wos:000232452700029
  • scopus:33644666356
ISSN
0161-5505
language
English
LU publication?
yes
id
bd7c422f-64a7-4e56-80c9-8d755485f275 (old id 144838)
alternative location
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=16204718&dopt=Abstract
date added to LUP
2007-07-23 12:22:52
date last changed
2017-06-25 04:24:26
@article{bd7c422f-64a7-4e56-80c9-8d755485f275,
  abstract     = {Activity determination from scintillation camera images using the conjugate view method may be inaccurate because of variation in scattered radiation from adjacent organs and activity from overlapping tissues. The aim of this study was to simulate patient scintillation camera images and from these evaluate the accuracy of 2 correction methods. The contribution from overlapping tissue activity was also calculated for some organs. Methods: Biokinetic data for Tc-99m-sestamibi obtained in rats was used as input to simulate scintillation camera images with a voxel-based computer phantom using the Monte Carlo method. The organ activity was calculated using the conjugate view method with either the effective attenuation coefficient method or scatter correction using the triple-energy window (TEW) method combined with attenuation correction with a transmission factor image. Images were simulated with activity in organs one by one to evaluate the accuracy of the 2 correction methods and to evaluate the activity contribution from activity in adjacent or overlapping tissues. To allow comparison with the clinical situation, the total activity distribution from the animal study was used to simulate scintillation camera images at different points in time and the calculated activity was compared with both the input data and some patient data from the literature. Results: The combination of scatter and attenuation correction gave the most accurate calculated activity, +/- 10% of the true activity from the images with activity in one organ at a time. In the images similar to the clinical situation, the kidney activity was overestimated up to a factor of 34, mainly because of excretion of activity through the intestines. Conclusion: The scatter correction using the TEW method in combination with attenuation correction with the measured transmission factor resulted in the most accurate activity determination of the methods used. This study also shows that organ activity data calculated from scintillation camera images may be overestimated by >90% because of activity in overlapping tissues.},
  author       = {Jönsson, Lena M and Ljungberg, Michael and Strand, Sven-Erik},
  issn         = {0161-5505},
  keyword      = {conjugate view method,Monte Carlo simulations,activity,quantification,scintigraphy,sestamibi},
  language     = {eng},
  number       = {10},
  pages        = {1679--1686},
  publisher    = {Society of Nuclear Medicine},
  series       = {Journal of Nuclear Medicine},
  title        = {Evaluation of accuracy in activity calculations for the conjugate view method from monte carlo simulated scintillation camera images using experimental data in an anthropomorphic phantom.},
  volume       = {46},
  year         = {2005},
}