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A new method for quantification of image distortion due to pile-up in scintillation cameras

Ceberg, Crister LU ; Larsson, Ingemar and Strand, Sven-Erik LU (1991) In European Journal Of Nuclear Medicine 18(12). p.959-963
Abstract
Characterization of the count-rate performance of scintillation cameras should include not only the specification of count losses. At high count rates, there is also an image distortion due to the mispositioning of pile-up events. In this paper a simple and clinically relevant procedure to quantify this distortion is presented. The images of a square uniform technetium-99m phantom at high and low count rates are used. The fraction of the total counts being correctly positioned is determined as the peripheral count density divided by the total average count density. This ratio, corrected for the camera non-uniformity at low count rates, is called the 'positioning ability'. According to the National Electrical Manufacturers' Association... (More)
Characterization of the count-rate performance of scintillation cameras should include not only the specification of count losses. At high count rates, there is also an image distortion due to the mispositioning of pile-up events. In this paper a simple and clinically relevant procedure to quantify this distortion is presented. The images of a square uniform technetium-99m phantom at high and low count rates are used. The fraction of the total counts being correctly positioned is determined as the peripheral count density divided by the total average count density. This ratio, corrected for the camera non-uniformity at low count rates, is called the 'positioning ability'. According to the National Electrical Manufacturers' Association (NEMA), the 'system count rate performance with scatter' should be reported as the measured count rate giving 20% count losses. In this paper it is suggested that this measure be complemented by a measure of the fraction correct positioned events at this count rate. This fraction, the 'high count rate positioning ability', can be easily and accurately measured using our method. The method has been tested on two different scintillation cameras. For one of them the high count rate positioning ability was determined as 91% at a measured count rate of 30,000 s-1 with 20% count losses. For the other camera, the corresponding figures were 88% at 59,000 s-1 and close to 100% at 38,000 s-1, before and after the installation of a new pile-up rejection circuit, respectively. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Scintillation camera, Pile-up, Image distortion, Quantification
in
European Journal Of Nuclear Medicine
volume
18
issue
12
pages
959 - 963
publisher
Springer
external identifiers
  • pmid:1778207
  • scopus:0025720511
ISSN
1432-105X
DOI
10.1007/BF00180416
language
English
LU publication?
yes
id
7da6f59c-e888-448a-a68a-8fa782e0638f (old id 1105976)
date added to LUP
2008-08-01 12:24:02
date last changed
2017-01-01 04:21:02
@article{7da6f59c-e888-448a-a68a-8fa782e0638f,
  abstract     = {Characterization of the count-rate performance of scintillation cameras should include not only the specification of count losses. At high count rates, there is also an image distortion due to the mispositioning of pile-up events. In this paper a simple and clinically relevant procedure to quantify this distortion is presented. The images of a square uniform technetium-99m phantom at high and low count rates are used. The fraction of the total counts being correctly positioned is determined as the peripheral count density divided by the total average count density. This ratio, corrected for the camera non-uniformity at low count rates, is called the 'positioning ability'. According to the National Electrical Manufacturers' Association (NEMA), the 'system count rate performance with scatter' should be reported as the measured count rate giving 20% count losses. In this paper it is suggested that this measure be complemented by a measure of the fraction correct positioned events at this count rate. This fraction, the 'high count rate positioning ability', can be easily and accurately measured using our method. The method has been tested on two different scintillation cameras. For one of them the high count rate positioning ability was determined as 91% at a measured count rate of 30,000 s-1 with 20% count losses. For the other camera, the corresponding figures were 88% at 59,000 s-1 and close to 100% at 38,000 s-1, before and after the installation of a new pile-up rejection circuit, respectively.},
  author       = {Ceberg, Crister and Larsson, Ingemar and Strand, Sven-Erik},
  issn         = {1432-105X},
  keyword      = {Scintillation camera,Pile-up,Image distortion,Quantification},
  language     = {eng},
  number       = {12},
  pages        = {959--963},
  publisher    = {Springer},
  series       = {European Journal Of Nuclear Medicine},
  title        = {A new method for quantification of image distortion due to pile-up in scintillation cameras},
  url          = {http://dx.doi.org/10.1007/BF00180416},
  volume       = {18},
  year         = {1991},
}