The dual photopeak-area method applied to scintillation camera measurements of effective depth and activity of in vivo 123I-distributions
Strand, Sven Erik LU and Persson, Bertil R.R. LU
(1977)
In European Journal Of Nuclear Medicine
2(2).
p.121-128
- Abstract
Attenuation curves and photopeak ratios of 159 keV and 28 keV phtons emitted in the decay of 123I have been studied using a scintillation camera equipped with an extra ADC for recording the pulse height distribution of the energy signal. Cavities of various sizes containing 123I-solution were placed at different depths in a water phantom in order to vary the effective depth, i.e., the thickness of attenuating material above the cavity plus the distance to the centre of activity in the cavity. The centre of activity varies with the distribution of activity in the cavity, size of cavity, and the effective attenuation coefficient derived from the attenuation curves. From the photopeak ratio an average effective depth... (More)
Attenuation curves and photopeak ratios of 159 keV and 28 keV phtons emitted in the decay of 123I have been studied using a scintillation camera equipped with an extra ADC for recording the pulse height distribution of the energy signal. Cavities of various sizes containing 123I-solution were placed at different depths in a water phantom in order to vary the effective depth, i.e., the thickness of attenuating material above the cavity plus the distance to the centre of activity in the cavity. The centre of activity varies with the distribution of activity in the cavity, size of cavity, and the effective attenuation coefficient derived from the attenuation curves. From the photopeak ratio an average effective depth is determined which can be used for calculating the attenuation correction factor. The dual photopeak ratio has been used in clinical evaluation of thyroid 123I uptake measurements where effective depths ranging from 21 to 43 mm were obtained for the activity in the thyroid. Applications of the photopeak ratio method for renography with 123I-hippuran and blood flow studies using 133Xe or 127Xe and studies with many other radionuclides are also discussed.
(Less)
- author
- Strand, Sven Erik
LU
and Persson, Bertil R.R.
LU
- organization
- publishing date
- 1977-01-01
- type
- Contribution to journal
- publication status
- published
- in
- European Journal Of Nuclear Medicine
- volume
- 2
- issue
- 2
- pages
- 8 pages
- publisher
- Springer
- external identifiers
-
- scopus:0017646215
- pmid:891557
- ISSN
- 0340-6997
- DOI
- 10.1007/BF00253685
- language
- English
- LU publication?
- yes
- id
- 1ca85b44-5276-4735-87d6-aef3599dd556
- date added to LUP
- 2020-08-30 21:00:09
- date last changed
- 2024-01-17 12:17:31
@article{1ca85b44-5276-4735-87d6-aef3599dd556,
abstract = {{<p>Attenuation curves and photopeak ratios of 159 keV and 28 keV phtons emitted in the decay of <sup>123</sup>I have been studied using a scintillation camera equipped with an extra ADC for recording the pulse height distribution of the energy signal. Cavities of various sizes containing <sup>123</sup>I-solution were placed at different depths in a water phantom in order to vary the effective depth, i.e., the thickness of attenuating material above the cavity plus the distance to the centre of activity in the cavity. The centre of activity varies with the distribution of activity in the cavity, size of cavity, and the effective attenuation coefficient derived from the attenuation curves. From the photopeak ratio an average effective depth is determined which can be used for calculating the attenuation correction factor. The dual photopeak ratio has been used in clinical evaluation of thyroid <sup>123</sup>I uptake measurements where effective depths ranging from 21 to 43 mm were obtained for the activity in the thyroid. Applications of the photopeak ratio method for renography with <sup>123</sup>I-hippuran and blood flow studies using <sup>133</sup>Xe or <sup>127</sup>Xe and studies with many other radionuclides are also discussed.</p>}},
author = {{Strand, Sven Erik and Persson, Bertil R.R.}},
issn = {{0340-6997}},
language = {{eng}},
month = {{01}},
number = {{2}},
pages = {{121--128}},
publisher = {{Springer}},
series = {{European Journal Of Nuclear Medicine}},
title = {{The dual photopeak-area method applied to scintillation camera measurements of effective depth and activity of in vivo <sup>123</sup>I-distributions}},
url = {{http://dx.doi.org/10.1007/BF00253685}},
doi = {{10.1007/BF00253685}},
volume = {{2}},
year = {{1977}},
}