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Dopamine D2 receptor SPECT with I-123-IBZM: evaluation of collimator and post-filtering when using model-based compensation-a Monte Carlo study

Larsson, Anne; Mo, Susanna Jakobson; Ljungberg, Michael LU and Riklund, Katrine (2010) In Physics in Medicine and Biology 55(7). p.1971-1988
Abstract
In I-123-IBZM brainSPECT, the main interest is the activity uptake in the striatum relative to the background, and semi-quantitative techniques using regions of interest are typically used for this purpose. Uncertainties in the measured uptakes can however be a problem due to low contrasts and high noise levels. Like SPECT in general, IBZM SPECT should benefit from reconstruction methods that include model-based compensation, but it is important that image acquisition is optimized for this technique. An important factor is the choice of collimator. In this study we compare four different parallel-hole collimators for IBZM SPECT regarding overall quantitative accuracy and measured uptake ratio as a function of image noise and uncertainty.... (More)
In I-123-IBZM brainSPECT, the main interest is the activity uptake in the striatum relative to the background, and semi-quantitative techniques using regions of interest are typically used for this purpose. Uncertainties in the measured uptakes can however be a problem due to low contrasts and high noise levels. Like SPECT in general, IBZM SPECT should benefit from reconstruction methods that include model-based compensation, but it is important that image acquisition is optimized for this technique. An important factor is the choice of collimator. In this study we compare four different parallel-hole collimators for IBZM SPECT regarding overall quantitative accuracy and measured uptake ratio as a function of image noise and uncertainty. The collimators are low-energy high-resolution (LEHR), low-energy general-purpose (LEGP), extended LEGP (ELEGP) and medium-energy general-purpose (MEGP). The effect of three Butterworth post-filters with cut-off frequencies of 0.3, 0.45 and 0.6 cm(-1) ( power factor 8) is also studied. All raw-data projections are produced using Monte Carlo simulations. Of the investigated collimators, the one that is most sensitive to the primary photons, ELEGP, proved to be the most optimal for realistic noise levels. Butterworth post-filtering is advantageous, and the cut-off frequency 0.45 cm(-1) was the best compromise in this study. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physics in Medicine and Biology
volume
55
issue
7
pages
1971 - 1988
publisher
IOP Publishing
external identifiers
  • wos:000275756200012
  • scopus:77950008003
ISSN
1361-6560
DOI
10.1088/0031-9155/55/7/012
language
English
LU publication?
yes
id
fd48a5e2-17b5-40ff-8450-bf8956447eb9 (old id 1587935)
date added to LUP
2010-04-22 12:15:13
date last changed
2018-05-29 11:30:06
@article{fd48a5e2-17b5-40ff-8450-bf8956447eb9,
  abstract     = {In I-123-IBZM brainSPECT, the main interest is the activity uptake in the striatum relative to the background, and semi-quantitative techniques using regions of interest are typically used for this purpose. Uncertainties in the measured uptakes can however be a problem due to low contrasts and high noise levels. Like SPECT in general, IBZM SPECT should benefit from reconstruction methods that include model-based compensation, but it is important that image acquisition is optimized for this technique. An important factor is the choice of collimator. In this study we compare four different parallel-hole collimators for IBZM SPECT regarding overall quantitative accuracy and measured uptake ratio as a function of image noise and uncertainty. The collimators are low-energy high-resolution (LEHR), low-energy general-purpose (LEGP), extended LEGP (ELEGP) and medium-energy general-purpose (MEGP). The effect of three Butterworth post-filters with cut-off frequencies of 0.3, 0.45 and 0.6 cm(-1) ( power factor 8) is also studied. All raw-data projections are produced using Monte Carlo simulations. Of the investigated collimators, the one that is most sensitive to the primary photons, ELEGP, proved to be the most optimal for realistic noise levels. Butterworth post-filtering is advantageous, and the cut-off frequency 0.45 cm(-1) was the best compromise in this study.},
  author       = {Larsson, Anne and Mo, Susanna Jakobson and Ljungberg, Michael and Riklund, Katrine},
  issn         = {1361-6560},
  language     = {eng},
  number       = {7},
  pages        = {1971--1988},
  publisher    = {IOP Publishing},
  series       = {Physics in Medicine and Biology},
  title        = {Dopamine D2 receptor SPECT with I-123-IBZM: evaluation of collimator and post-filtering when using model-based compensation-a Monte Carlo study},
  url          = {http://dx.doi.org/10.1088/0031-9155/55/7/012},
  volume       = {55},
  year         = {2010},
}