Document Detail


Correction of iodine-123-labeled meta-iodobenzylguanidine uptake with multi-window methods for standardization of the heart-to-mediastinum ratio.
MedLine Citation:
PMID:  18022111     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: To overcome differences in the choice of collimator for an iodine-123 ((123)I)-labeled meta-iodobenzylguanidine (MIBG) heart-to-mediastinum (H/M) ratio, we examined multi-window correction methods with (123)I dual-window (IDW) and triple-energy window (TEW) acquisition. METHODS AND RESULTS: Standard phantoms, which consisted of the heart, mediastinum, lung, and liver, were generated. Three correction methods were compared: TEW and two IDW methods (IDW(0) and IDW(1)). Low-energy high-resolution (LEHR), medium-energy (ME), and (123)I-specific low-medium-energy high-resolution (LMEHR) collimators were used. Clinical studies were performed in 10 patients. In the phantom study, the H/M ratio was significantly underestimated without correction, with both the LEHR and ME collimators (70% and 88% of the true value). When H/M with the LEHR collimator was divided by uncorrected H/M with the ME collimator, the ratio (mean +/- SD) was 80% +/- 5%, 98% +/- 5%, 104% +/- 7%, and 98% +/- 5% for the no-correction, TEW, IDW(0), and IDW(1) methods, respectively. Clinical studies with the LEHR collimator after TEW and IDW correction (uncorrected average H/M ratio, 1.86 +/- 0.23; TEW, 2.47 +/- 0.46, P = .0015; IDW, 2.46 +/- 0.46, P = .0017) provided comparable values to the uncorrected ME collimator (2.56 +/- 0.46, P = NS vs TEW and IDW). CONCLUSIONS: The H/M ratio with the ME collimator, after application of the TEW or IDW methods, was close to the theoretical value in the phantom study. However, the corrected H/M ratios with the LEHR collimator provided comparable H/M ratios to the uncorrected ME data in phantom and clinical studies.
Authors:
Kenichi Nakajima; Kosuke Matsubara; Takehiro Ishikawa; Nobutoku Motomura; Ryo Maeda; Nasima Akhter; Koichi Okuda; Junichi Taki; Seigo Kinuya
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology     Volume:  14     ISSN:  1532-6551     ISO Abbreviation:  J Nucl Cardiol     Publication Date:    2007 Nov-Dec
Date Detail:
Created Date:  2007-11-20     Completed Date:  2008-01-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9423534     Medline TA:  J Nucl Cardiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  843-51     Citation Subset:  IM    
Affiliation:
Department of Biotracer Medicine, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan. nakajima@med.kanazawa-u.ac.jp
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MeSH Terms
Descriptor/Qualifier:
3-Iodobenzylguanidine / diagnostic use*,  pharmacokinetics*
Artifacts
Calibration
Heart / radionuclide imaging
Humans
Image Enhancement / methods
Image Interpretation, Computer-Assisted / methods*
Mediastinum / radionuclide imaging
Myocardium / metabolism*
Phantoms, Imaging*
Positron-Emission Tomography / instrumentation*,  methods*
Radiopharmaceuticals / diagnostic use,  pharmacokinetics
Reproducibility of Results
Sensitivity and Specificity
Chemical
Reg. No./Substance:
0/Radiopharmaceuticals; 77679-27-7/3-Iodobenzylguanidine

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