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Bergeron DE, Cessna JT, Fitzgerald RP, Hamad G, Laureano-Pérez L, Pibida L, Zimmerman BE. Liquid scintillation efficiencies, gamma-ray emission intensities, and half-life for Gd-153. Appl Radiat Isot 2024; 203:111108. [PMID: 38000166 DOI: 10.1016/j.apradiso.2023.111108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 10/23/2023] [Accepted: 11/06/2023] [Indexed: 11/26/2023]
Abstract
Gadolinium-153 was standardized for activity by live-timed anticoincidence counting and an ampoule was submitted to the international reference system (SIR). Absolute emission intensities for the main γ rays were determined with calibrated high-purity germanium (HPGe) and lithium-drifted silicon (Si(Li)) detectors. A revised decay scheme is indicated, with no probability of direct electron capture to the 153Eu ground state. Triple-to-double coincidence ratio (TDCR) efficiency curves indicate that the revised decay scheme is consistent with experiment. Half-life measurements agree with a previous NIST determination and show no sensitivity to chemical environment.
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Affiliation(s)
- Denis E Bergeron
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899-8462, USA.
| | - Jeffrey T Cessna
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899-8462, USA
| | - Ryan P Fitzgerald
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899-8462, USA
| | - Gulakhshan Hamad
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899-8462, USA; Janssen Pharmaceuticals, Inc., Malvern, PA, 19355, USA
| | - Lizbeth Laureano-Pérez
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899-8462, USA
| | - Leticia Pibida
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899-8462, USA
| | - Brian E Zimmerman
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899-8462, USA
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Al-Mallah MH, Bateman TM, Branch KR, Crean A, Gingold EL, Thompson RC, McKenney SE, Miller EJ, Murthy VL, Nieman K, Villines TC, Yester MV, Einstein AJ, Mahmarian JJ. 2022 ASNC/AAPM/SCCT/SNMMI guideline for the use of CT in hybrid nuclear/CT cardiac imaging. J Nucl Cardiol 2022; 29:3491-3535. [PMID: 36056224 DOI: 10.1007/s12350-022-03089-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Accepted: 08/08/2022] [Indexed: 01/29/2023]
Affiliation(s)
- Mouaz H Al-Mallah
- Department of Cardiology, Houston Methodist DeBakey Heart and Vascular Center, Houston, TX, USA.
| | - Timothy M Bateman
- Department of Cardiology, Saint Luke's Mid America Heart Institute, University of Missouri-Kansas City, Kansas City, MO, USA
| | - Kelley R Branch
- Division of Cardiovascular, University of Washington, Seattle, WA, USA
| | - Andrew Crean
- Division of Cardiovascular Medicine, Ottawa Heart Institute, Ottawa, ON, Canada
| | - Eric L Gingold
- Department of Radiology, Thomas Jefferson University, Philadelphia, PA, USA
| | - Randall C Thompson
- Department of Cardiology, Saint Luke's Mid America Heart Institute, University of Missouri-Kansas City, Kansas City, MO, USA
| | - Sarah E McKenney
- Department of Radiology, University of California, Davis Medical Center, Sacramento, CA, USA
| | - Edward J Miller
- Section of Cardiovascular Medicine, Yale University School of Medicine, New Haven, CT, USA
| | - Venkatesh L Murthy
- Division of Cardiovascular Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Koen Nieman
- Departments of Cardiovascular Medicine and Radiology, Stanford University Medical Center, Stanford, CA, USA
| | - Todd C Villines
- Division of Cardiovascular Medicine, University of Virginia Health System, Charlottesville, VA, USA
| | - Michael V Yester
- Department of Radiology, School of Medicine, University of Alabama Medical Center, Birmingham, AL, USA
| | - Andrew J Einstein
- Division of Cardiology, Department of Medicine, and Department of Radiology, Columbia University Irving Medical Center and New York-Presbyterian Hospital, New York, NY, USA
| | - John J Mahmarian
- Department of Cardiology, Houston Methodist DeBakey Heart and Vascular Center, Houston, TX, USA
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Trpkov C, Savtchenko A, Liang Z, Feng P, Southern DA, Wilton SB, James MT, Feil E, Mylonas I, Miller RJH. Visually estimated coronary artery calcium score improves SPECT-MPI risk stratification. IJC HEART & VASCULATURE 2021; 35:100827. [PMID: 34195354 PMCID: PMC8233133 DOI: 10.1016/j.ijcha.2021.100827] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 05/30/2021] [Accepted: 06/10/2021] [Indexed: 12/13/2022]
Abstract
Aims Computed tomographic attenuation correction (CTAC) scans for single photon emission computed tomography myocardial perfusion imaging (SPECT-MPI) may reveal coronary artery calcification. The independent prognostic value of a visually estimated coronary artery calcium score (VECACS) from these low-dose, non-gated scans is not established. Methods & Results VECACS was evaluated in 4,720 patients undergoing SPECT-MPI with CTAC using a 4-point scale. Major adverse cardiac events (MACE) were defined as all-cause mortality, acute coronary syndrome, or revascularization > 90 days after SPECT-MPI. Independent associations with MACE were determined with multivariable Cox proportional hazards analyses adjusted for age, sex, past medical history, perfusion findings, and left ventricular ejection fraction. During a median follow up of 2.9 years (interquartile range 1.8 - 4.2), 494 (10.5%) patients experienced MACE. Compared to absent VECACS, patients with increased VECACS were more likely to experience MACE (all log-rank p < 0.001), and findings were similar when stratified by normal or abnormal perfusion. Multivariable analysis showed an increased MACE risk associated with VECACS categories of equivocal (adjusted hazard ratio [HR] 2.54, 95% CI 1.45-4.45, p = 0.001), present (adjusted HR 2.44, 95% CI 1.74-3.42, p < 0.001) and extensive (adjusted HR 3.47, 95% CI 2.41-5.00, p < 0.001) compared to absent. Addition of VECACS to the multivariable model improved risk classification (continuous net reclassification index 0.207, 95% CI 0.131 - 0.310). Conclusion VECACS was an independent predictor of MACE in this large SPECT-MPI patient cohort. VECACS from CTAC can be used to improve risk stratification with SPECT-MPI without additional radiation.
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Affiliation(s)
- Cvetan Trpkov
- Department of Cardiac Sciences, Cumming School of Medicine, University of Calgary, and Libin Cardiovascular Institute, Calgary, AB, Canada
| | - Alexei Savtchenko
- Department of Cardiac Sciences, Cumming School of Medicine, University of Calgary, and Libin Cardiovascular Institute, Calgary, AB, Canada
| | - Zhiying Liang
- Department of Cardiac Sciences, Cumming School of Medicine, University of Calgary, and Libin Cardiovascular Institute, Calgary, AB, Canada
| | - Patrick Feng
- Department of Cardiac Sciences, Cumming School of Medicine, University of Calgary, and Libin Cardiovascular Institute, Calgary, AB, Canada
| | - Danielle A Southern
- Department of Medicine, Department of Community Health Sciences, O'Brien Institute for Public Health, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Stephen B Wilton
- Department of Cardiac Sciences, Cumming School of Medicine, University of Calgary, and Libin Cardiovascular Institute, Calgary, AB, Canada
| | - Matthew T James
- Department of Medicine, Department of Community Health Sciences, O'Brien Institute for Public Health, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Erin Feil
- Department of Cardiac Sciences, Cumming School of Medicine, University of Calgary, and Libin Cardiovascular Institute, Calgary, AB, Canada
| | - Ilias Mylonas
- Department of Cardiac Sciences, Cumming School of Medicine, University of Calgary, and Libin Cardiovascular Institute, Calgary, AB, Canada
| | - Robert J H Miller
- Department of Cardiac Sciences, Cumming School of Medicine, University of Calgary, and Libin Cardiovascular Institute, Calgary, AB, Canada
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