Document Detail

Poststress motionlike artifacts caused by the use of a dual-head gamma camera for (201)Tl myocardial SPECT.
MedLine Citation:
PMID:  11884486     Owner:  NLM     Status:  MEDLINE    
When performing (201)Tl myocardial SPECT using a dual-head gamma camera on patients after exercise stress, we have observed in some a sudden increase in the counting rate between the 16th and 17th images. This increase provoked motionlike artifacts, which increased the number of false-positive findings. The aim of our study was to determine possible causes for this leap in activity. METHODS: We performed myocardial SPECT using a dual-head gamma camera on 110 patients after exercise stress: in 38 patients approximately 5 min after injection (group 1), in 43 patients approximately 14 min after injection (group 2), and in 29 patients twice, at approximately 5 and 20 min after injection (group 3). We also performed dynamic data acquisition for 10 min on 18 patients after exercise stress. We compared activity in the heart region in image series obtained after exercise stress and at rest. RESULTS: Daily quality control tests eliminated the possibility of any malfunctions of the gamma camera. Careful image analysis showed no visible patient motion. Our results showed that upward creep of the heart could not be a cause of the described phenomenon. After exercise stress, a > or = 5% activity leap in the heart region on the 16th and 17th frames was more frequent in group 1 than in group 2. Two consecutive acquisitions after exercise stress showed that the leap was >5% in 24 patients (83%) and 12 patients (41%) at the first and second acquisitions, respectively (group 3). In all patients, the leap was <5% at rest. Dynamic studies showed that the activity in the heart region steadily decreased in all patients after exercise stress. We suggest that decreasing (201)Tl concentrations in myocardium or blood could be a major reason for the described artifacts. CONCLUSION: We proposed that the pharmacokinetics of (201)Tl-chloride be evaluated within a short time after injection in humans after exercise stress. Now, in our department, we have begun acquisition approximately 12 min after (201)Tl administration, and the above-mentioned phenomenon has not appeared. However, to avoid the artifacts caused by early redistribution of (201)Tl, acquisition must not begin too late.
Oleg Blagosklonov; Ahmad Sabbah; Josette Verdenet; Michel Baud; Jean-Claude Cardot
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of nuclear medicine : official publication, Society of Nuclear Medicine     Volume:  43     ISSN:  0161-5505     ISO Abbreviation:  J. Nucl. Med.     Publication Date:  2002 Mar 
Date Detail:
Created Date:  2002-03-08     Completed Date:  2002-04-05     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0217410     Medline TA:  J Nucl Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  285-91     Citation Subset:  IM    
Department of Nuclear Cardiology, Jean Minjoz University Hospital, Besançon, France.
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MeSH Terms
Exercise Test*
False Positive Reactions
Gamma Cameras*
Heart / radionuclide imaging*
Middle Aged
Phantoms, Imaging
Retrospective Studies
Thallium / diagnostic use*,  pharmacokinetics
Thallium Radioisotopes / diagnostic use*,  pharmacokinetics
Tomography, Emission-Computed, Single-Photon / instrumentation*
Reg. No./Substance:
0/Thallium Radioisotopes; 7440-28-0/Thallium; 7791-12-0/thallium chloride
Comment In:
J Nucl Med. 2004 Sep;45(9):1597   [PMID:  15347730 ]
J Nucl Med. 2003 Mar;44(3):484-5; author reply 485-6   [PMID:  12621019 ]

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