Comparison of the physical characteristics of I-131 and I-123, with respect to differentiating the relative activity in the kidneys

L. P. Clarke, F. Qadir, W. Al-Sheikh, George N Sfakianakis, Aldo N Serafini

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Iodine-123 (159 keV, T(1/2) = 13.3 hr) has been proposed for renal investigations, as opposed to I-131 (364 keV, T(1/2) = 8.06 days), because of its more practical photon energy and lower radiation dose to the patient. The cyclotron production method 124Te (p,2n) 123I for I-123 results in contamination with I-124 (T(1/2) = 4.5 days). The latter emits high-energy photons whose relative abundance increases with time after end to bombardment (EOB). This paper is an evaluation of the effects of photon penetration, scatter, and attenuation on the phantom calibration measurements required for determining relative renal uptake using I-123. Measurements using I-131 were performed for comparison. Parameters investigated included: the relationship between the integrated count and ROI size, the magnitude of the 'cross-talk' in counts between the kidneys, and the attenuation corrections for source (kidney) depth. Phantom results I-123 for I-124 suggest that this radionuclide will allow a better measurement of the activity in individual kidneys. Collimator penetration effects were greater for I-131 than for I-123. With I-123 for example, a higher fraction of the counts due to the activity in the kidney phantom were observed within the ROI enclosing its image. However, the attenuation corrections for source depth for I-123 were dependent on both the size of the ROI and time after EOB.

Original languageEnglish
Pages (from-to)683-688
Number of pages6
JournalJournal of Nuclear Medicine
Volume24
Issue number8
StatePublished - Dec 1 1983
Externally publishedYes

Fingerprint

Kidney
Photons
Cyclotrons
Radioisotopes
Iodine
Calibration
Radiation

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology

Cite this

Comparison of the physical characteristics of I-131 and I-123, with respect to differentiating the relative activity in the kidneys. / Clarke, L. P.; Qadir, F.; Al-Sheikh, W.; Sfakianakis, George N; Serafini, Aldo N.

In: Journal of Nuclear Medicine, Vol. 24, No. 8, 01.12.1983, p. 683-688.

Research output: Contribution to journalArticle

@article{fedecdd6be2640328b72fe9a80eed5f1,
title = "Comparison of the physical characteristics of I-131 and I-123, with respect to differentiating the relative activity in the kidneys",
abstract = "Iodine-123 (159 keV, T(1/2) = 13.3 hr) has been proposed for renal investigations, as opposed to I-131 (364 keV, T(1/2) = 8.06 days), because of its more practical photon energy and lower radiation dose to the patient. The cyclotron production method 124Te (p,2n) 123I for I-123 results in contamination with I-124 (T(1/2) = 4.5 days). The latter emits high-energy photons whose relative abundance increases with time after end to bombardment (EOB). This paper is an evaluation of the effects of photon penetration, scatter, and attenuation on the phantom calibration measurements required for determining relative renal uptake using I-123. Measurements using I-131 were performed for comparison. Parameters investigated included: the relationship between the integrated count and ROI size, the magnitude of the 'cross-talk' in counts between the kidneys, and the attenuation corrections for source (kidney) depth. Phantom results I-123 for I-124 suggest that this radionuclide will allow a better measurement of the activity in individual kidneys. Collimator penetration effects were greater for I-131 than for I-123. With I-123 for example, a higher fraction of the counts due to the activity in the kidney phantom were observed within the ROI enclosing its image. However, the attenuation corrections for source depth for I-123 were dependent on both the size of the ROI and time after EOB.",
author = "Clarke, {L. P.} and F. Qadir and W. Al-Sheikh and Sfakianakis, {George N} and Serafini, {Aldo N}",
year = "1983",
month = "12",
day = "1",
language = "English",
volume = "24",
pages = "683--688",
journal = "Journal of Nuclear Medicine",
issn = "0161-5505",
publisher = "Society of Nuclear Medicine Inc.",
number = "8",

}

TY - JOUR

T1 - Comparison of the physical characteristics of I-131 and I-123, with respect to differentiating the relative activity in the kidneys

AU - Clarke, L. P.

AU - Qadir, F.

AU - Al-Sheikh, W.

AU - Sfakianakis, George N

AU - Serafini, Aldo N

PY - 1983/12/1

Y1 - 1983/12/1

N2 - Iodine-123 (159 keV, T(1/2) = 13.3 hr) has been proposed for renal investigations, as opposed to I-131 (364 keV, T(1/2) = 8.06 days), because of its more practical photon energy and lower radiation dose to the patient. The cyclotron production method 124Te (p,2n) 123I for I-123 results in contamination with I-124 (T(1/2) = 4.5 days). The latter emits high-energy photons whose relative abundance increases with time after end to bombardment (EOB). This paper is an evaluation of the effects of photon penetration, scatter, and attenuation on the phantom calibration measurements required for determining relative renal uptake using I-123. Measurements using I-131 were performed for comparison. Parameters investigated included: the relationship between the integrated count and ROI size, the magnitude of the 'cross-talk' in counts between the kidneys, and the attenuation corrections for source (kidney) depth. Phantom results I-123 for I-124 suggest that this radionuclide will allow a better measurement of the activity in individual kidneys. Collimator penetration effects were greater for I-131 than for I-123. With I-123 for example, a higher fraction of the counts due to the activity in the kidney phantom were observed within the ROI enclosing its image. However, the attenuation corrections for source depth for I-123 were dependent on both the size of the ROI and time after EOB.

AB - Iodine-123 (159 keV, T(1/2) = 13.3 hr) has been proposed for renal investigations, as opposed to I-131 (364 keV, T(1/2) = 8.06 days), because of its more practical photon energy and lower radiation dose to the patient. The cyclotron production method 124Te (p,2n) 123I for I-123 results in contamination with I-124 (T(1/2) = 4.5 days). The latter emits high-energy photons whose relative abundance increases with time after end to bombardment (EOB). This paper is an evaluation of the effects of photon penetration, scatter, and attenuation on the phantom calibration measurements required for determining relative renal uptake using I-123. Measurements using I-131 were performed for comparison. Parameters investigated included: the relationship between the integrated count and ROI size, the magnitude of the 'cross-talk' in counts between the kidneys, and the attenuation corrections for source (kidney) depth. Phantom results I-123 for I-124 suggest that this radionuclide will allow a better measurement of the activity in individual kidneys. Collimator penetration effects were greater for I-131 than for I-123. With I-123 for example, a higher fraction of the counts due to the activity in the kidney phantom were observed within the ROI enclosing its image. However, the attenuation corrections for source depth for I-123 were dependent on both the size of the ROI and time after EOB.

UR - http://www.scopus.com/inward/record.url?scp=0020965117&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0020965117&partnerID=8YFLogxK

M3 - Article

C2 - 6875678

AN - SCOPUS:0020965117

VL - 24

SP - 683

EP - 688

JO - Journal of Nuclear Medicine

JF - Journal of Nuclear Medicine

SN - 0161-5505

IS - 8

ER -