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Imbert L, Marie PY. Dedicated CZT gamma cameras for nuclear cardiology. Nucl Med Mol Imaging 2022. [DOI: 10.1016/b978-0-12-822960-6.00080-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Songy B, Guernou M, Lussato D, Queneau M, Bonardel G, Grellier JF, Flahaut L, Nguyen D. Feasibility of simultaneous dual isotope acquisition for myocardial perfusion imaging with a cadmium zinc telluride camera. J Nucl Cardiol 2020; 27:737-747. [PMID: 30478657 DOI: 10.1007/s12350-018-1452-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Accepted: 08/10/2018] [Indexed: 10/27/2022]
Abstract
BACKGROUND We studied the impact of technetium-99m (99mTc) in the thallium-201 (201Tl) energy window (70 keV) to determine if CZT cardiac cameras allow us to perform simultaneous dual-isotope acquisition for myocardial perfusion imaging. METHODS We included 117 consecutive patients. We injected 0.7 MBq/kg of 201Tl at stress, performed the first scan (image T1), then injected at rest 2 MBq/kg of 99mTc-tetrofosmin and immediately acquired a second scan with reconstruction in the energy window of thallium (image T2). A corrected thallium image was created by the subtraction of 99mTc downscattered photons (image TS). We compared spectra, image quality, and semiquantitative scores on T1, T2, and TS images. RESULTS Though T2 images were of worse quality, TS images were of equal quality compared to T1 images in most cases. Scores show an underestimation of abnormalities in 20% of patients on T2 images and in 10% on TS images. CONCLUSIONS Despite the improved energy resolution of CZT cameras, downscatter of technetium in the 201Tl window leads to an underestimation of the pathological territory in 10% to 20% of cases. It does not allow us to use simultaneous dual-isotope acquisition in clinical practice without additional tools for scatter correction.
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Affiliation(s)
- Bernard Songy
- Nuclear Cardiology, Centre Cardiologique du Nord (CCN), Saint-Denis, Paris, France.
| | - Mohamed Guernou
- Nuclear Cardiology, Centre Cardiologique du Nord (CCN), Saint-Denis, Paris, France
| | - David Lussato
- Nuclear Cardiology, Centre Cardiologique du Nord (CCN), Saint-Denis, Paris, France
| | - Mathieu Queneau
- Nuclear Cardiology, Centre Cardiologique du Nord (CCN), Saint-Denis, Paris, France
| | - Gerald Bonardel
- Nuclear Cardiology, Centre Cardiologique du Nord (CCN), Saint-Denis, Paris, France
| | | | - Ludovic Flahaut
- Nuclear Cardiology, Centre Cardiologique du Nord (CCN), Saint-Denis, Paris, France
| | - Duc Nguyen
- Nuclear Cardiology, Centre Cardiologique du Nord (CCN), Saint-Denis, Paris, France
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Desmonts C, Bouthiba MA, Enilorac B, Nganoa C, Agostini D, Aide N. Evaluation of a new multipurpose whole-body CzT-based camera: comparison with a dual-head Anger camera and first clinical images. EJNMMI Phys 2020; 7:18. [PMID: 32185566 PMCID: PMC7078403 DOI: 10.1186/s40658-020-0284-5] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Accepted: 02/26/2020] [Indexed: 11/23/2022] Open
Abstract
Background Evaluate the physical performance of the VERITON CzT camera (Spectrum Dynamics, Caesarea, Israel) that benefits from new detection architecture enabling whole-body imaging compared to that of a conventional dual-head Anger camera. Methods Different line sources and phantom measurements were performed on each system to evaluate spatial resolution, sensitivity, energy resolution and image quality with acquisition and reconstruction parameters similar to those used in clinical routine. Extrinsic resolution was assessed using 99mTc capillary sources placed successively in air, in a head and in a body phantom filled with background activity. Spectral acquisitions for various radioelements used in nuclear medicine (99mTc, 123I, 201Tl, 111In) were performed to evaluate energy resolution by computing the FWHM of the measured photoelectric peak. Tomographic sensitivity was calculated by recording the total number of counts detected during tomographic acquisition for a set of source geometries representative of different clinical situations. Sensitivity was also evaluated in focus mode for the CzT camera, which consisted of forcing detectors to collect data in a reduced field-of-view. Image quality was assessed with a Jaszczak phantom filled with 350 MBq of 99mTc and scanned on each system with 30-,20-,10- and 5-min acquisition times. Results Extrinsic and tomographic resolution in the brain and body phantoms at the centre of the FOV was estimated at 3.55, 7.72 and 6.66 mm for the CzT system and 2.47, 7.75 and 7.72 mm for the conventional system, respectively. The energy resolution measured at 140 keV was 5.46% versus 9.21% for the Anger camera and was higher in a same manner for all energy peaks tested. Tomographic sensitivity for a point source in air was estimated at 236 counts·s−1·MBq−1 and increased to 1159 counts·s−1·MBq−1 using focus mode, which was 1.6 times and 8 times greater than the sensitivity measured on the scintillation camera (144 counts·s−1·MBq−1). Head and body measurements also showed higher sensitivity for the CzT camera in particular with focus mode. The Jaszczak phantom showed high image contrast uniformity and a high signal-to-noise ratio on the CzT system, even when decreasing acquisition time by 6-fold. Representative clinical cases are shown to illustrate these results. Conclusion The CzT camera has a superior sensitivity, higher energy resolution and better image contrast than the conventional SPECT camera, whereas spatial resolution remains similar. Introduction of this new technology may change current practices in nuclear medicine such as decreasing acquisition time and activity injected to patient.
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Affiliation(s)
- Cédric Desmonts
- Department of Nuclear Medicine, Caen University Hospital, Avenue de la côte de Nacre, 14033, Caen Cedex 9, France.
| | | | - Blandine Enilorac
- Department of Nuclear Medicine, Caen University Hospital, Avenue de la côte de Nacre, 14033, Caen Cedex 9, France
| | - Catherine Nganoa
- Department of Nuclear Medicine, Caen University Hospital, Avenue de la côte de Nacre, 14033, Caen Cedex 9, France
| | - Denis Agostini
- Department of Nuclear Medicine, Caen University Hospital, Avenue de la côte de Nacre, 14033, Caen Cedex 9, France.,Normandie University, Caen, France
| | - Nicolas Aide
- Department of Nuclear Medicine, Caen University Hospital, Avenue de la côte de Nacre, 14033, Caen Cedex 9, France.,Normandie University, Caen, France.,Inserm Anticipe, Normandie University, Caen, France
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Tissot H, Roch V, Morel O, Veran N, Perrin M, Claudin M, Verger A, Karcher G, Marie PY, Imbert L. Left ventricular ejection fraction determined with the simulation of a very low-dose CZT-SPECT protocol and an additional count-calibration on planar radionuclide angiographic data. J Nucl Cardiol 2019; 26:1539-1549. [PMID: 30815836 DOI: 10.1007/s12350-019-01619-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Accepted: 12/21/2018] [Indexed: 01/24/2023]
Abstract
PURPOSE To determine whether the left ventricular ejection fractions (EFs), measured on a high-sensitivity CZT single photon emission computed tomography (SPECT)-camera with a 70% reduction in recording times and a prevention of EF overestimation through an additional count-calibration, are concordant with reference EF from planar radionuclide angiography (2D-RNA). METHODS An additional 10-minute CZT-SPECT recording was performed in patients referred to 2D-RNA for cardiomyopathy (n = 23) or chemotherapy monitoring (n = 50) with an in vivo red blood cell labeling with 850 MBq [Formula: see text]. The EF, obtained from CZT-SPECT with 100% (SPECT100) or 30% (SPECT30) projection times and with a SPECT-count calibration on the 2D-RNA counts of corresponding cavity volumes, were compared to EF from 2D-RNA. RESULTS Strong and equivalent relationships were documented between the EF from 2D-RNA and the calibrated EF from SPECT100 (y = 0.89x + 6.62; R2 = 0.87) and SPECT30 (y = 0.87x + 8.40; R2 = 0.85), and the mean EF from SPECT100 (54% ± 15%) and SPECT30 (53% ± 16%) were close to that from 2D-RNA (55% ± 15%). However, upward shifts in these mean values were documented in the absence of count calibration for both SPECT100 (60% ± 18%) and SPECT30 (60% ± 18%). CONCLUSION Left ventricular EF may be determined on a high-sensitivity CZT-camera, a 70% reduction in injected activities, and an additional count-calibration for further enhancing the concordance with 2D-RNA values.
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Affiliation(s)
- Hubert Tissot
- Department of Nuclear Medicine and Nancyclotep Molecular Imaging Platform, CHRU-Nancy, Université de Lorraine, 54000, Nancy, France
| | - Véronique Roch
- Department of Nuclear Medicine and Nancyclotep Molecular Imaging Platform, CHRU-Nancy, 54000, Nancy, France
| | - Olivier Morel
- CHU-Besançon, Université de Franche-Comté, Service de Médecine Nucléaire, 25000, Besançon, France
| | - Nicolas Veran
- Department of Nuclear Medicine, CHRU-Nancy, 54000, Nancy, France
| | - Mathieu Perrin
- Department of Nuclear Medicine, CHRU-Nancy, 54000, Nancy, France
| | - Marine Claudin
- Department of Nuclear Medicine, CHRU-Nancy, 54000, Nancy, France
| | - Antoine Verger
- Department of Nuclear Medicine and Nancyclotep Molecular Imaging Platform, CHRU-Nancy, Université de Lorraine, 54000, Nancy, France
- INSERM, UMR 1254, Université de Lorraine, 54000, Nancy, France
| | - Gilles Karcher
- Department of Nuclear Medicine and Nancyclotep Molecular Imaging Platform, CHRU-Nancy, Université de Lorraine, 54000, Nancy, France
| | - Pierre-Yves Marie
- Department of Nuclear Medicine and Nancyclotep Molecular Imaging Platform, CHRU-Nancy, Université de Lorraine, 54000, Nancy, France
- INSERM, UMR 1116, Université de Lorraine, 54000, Nancy, France
| | - Laetitia Imbert
- Department of Nuclear Medicine and Nancyclotep Molecular Imaging Platform, CHRU-Nancy, 54000, Nancy, France.
- INSERM, UMR 1254, Université de Lorraine, 54000, Nancy, France.
- Médecine Nucléaire, Hôpital de Brabois, CHRU-Nancy, Allée du Morvan, 54500, Vandoeuvre-Les-Nancy, France.
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Malhotra S, Doukky R. Dual isotope stress Tl-201 and rest Tc-99m CZT SPECT: Are we truly leveraging CZT technology? J Nucl Cardiol 2019; 26:1280-1283. [PMID: 29511930 DOI: 10.1007/s12350-018-1242-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Accepted: 02/15/2018] [Indexed: 12/18/2022]
Affiliation(s)
- Saurabh Malhotra
- Division of Cardiovascular Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA
| | - Rami Doukky
- Division of Cardiology, Cook County Health and Hospitals Systems, 1901 W. Harrison St., Suite 3620, Chicago, IL, 60612, USA.
- Division of Cardiology, Rush University Medical Center, Chicago, IL, USA.
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The prognostic value of ultra low-dose thallium myocardial perfusion protocol using CZT SPECT. Int J Cardiovasc Imaging 2019; 35:1163-1167. [PMID: 30680654 DOI: 10.1007/s10554-019-01535-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Accepted: 01/14/2019] [Indexed: 01/07/2023]
Abstract
The purpose of this study was to assess the prognostic value of ultra-low dose thallium myocardial perfusion imaging. Three hundred and sixty-six patients (245 men) underwent ultra-low dose stress-redistribution imaging on CZT SPECT camera GE Discovery NM 530c. The stress test was performed by bicycle ergometry or regadenoson injection. The activity of 0.5 MBq (0.014 mCi) Tl-201 chloride per kilogram of body weight was administered. The stress images were acquired immediately and redistribution images were taken after 3 h. Patient follow-up was focused on combined end-point (death, myocardial infarction, unstable angina, revascularization and hospitalization for heart failure). Data analysis was performed from hospital database, with a mean period 23 months. Patients with revascularization within 1 month after SPECT was excluded as revascularization for diagnosis. Ischaemia on SPECT was found in 72 patients, 294 patients were without ischaemia. In patients with ischaemia there were 21 (29.2%) subjects with cardiac events, and 23 (7.9%) in patients without ischaemia (HR 4.15, 95% CI 2.30-7.51, p < 0.0001). Ultra-low dose thallium perfusion imaging using CZT camera provides very good prognostic results in assessment of myocardial ischaemia.
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Song C, Yang Y, Qi W, Wernick MN, Pretorius PH, King MA. Motion-compensated image reconstruction vs postreconstruction correction in respiratory-binned SPECT with standard and reduced-dose acquisitions. Med Phys 2018; 45:2991-3000. [PMID: 29679508 DOI: 10.1002/mp.12932] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Revised: 03/19/2018] [Accepted: 04/04/2018] [Indexed: 11/09/2022] Open
Abstract
PURPOSE Cardiac perfusion images in single-photon emission computed tomography (SPECT) can suffer from respiratory motion blur. We investigated a reconstruction approach for correcting respiratory motion in respiratory-binned acquisitions and assessed the benefit of this approach in both standard dose and reduced dose. METHODS We modeled the acquired data from different respiratory bins by a joint probability distribution which was parameterized with respect to a common reference bin. The acquired data from all the respiratory bins were then utilized simultaneously for determining the source distribution in the reference bin using maximum a posteriori (MAP) estimation. We evaluated this approach with simulated imaging data and ten sets of clinical acquisitions, and compared it with a postreconstruction motion correction approach developed previously. We quantified the accuracy of the reconstruction results both at standard dose and with imaging dose reduced by 50% and 75%, respectively. RESULTS The proposed motion-compensated reconstruction (MCR) approach led to improved reconstruction of the myocardium in terms of both noise level and LV wall resolution. Compared to traditional acquisition (without motion correction), the proposed approach reduced the mean squared error of the image intensity in the myocardium by 27.59%, 20.59%, and 12.05% at full, half-, and quarter dose, respectively; the LV resolution, quantified by the full width at half-maximum (FWHM), was improved by 17.34%, 14.35%, and 12.95% at full, half-, and quarter dose, respectively; in addition, the proposed approach also improved the perfusion defect detectability at both full dose and reduced dose. Furthermore, with motion correction, the reconstruction results obtained at half-dose were comparable to that obtained at full dose without correction. Similar improvements were also demonstrated in the clinical acquisitions at different dose levels. CONCLUSIONS Respiratory motion correction in perfusion SPECT can improve the reconstruction of the myocardium at both standard and reduced dose. At half-dose, the results obtained with motion correction are comparable to that of traditional reconstruction obtained at full dose. MCR can be more accurate than postreconstruction correction.
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Affiliation(s)
- Chao Song
- Medical Imaging Research Center, Department of Electrical and Computer Engineering, Illinois Institute of Technology, Chicago, IL, 60616, USA
| | - Yongyi Yang
- Medical Imaging Research Center, Department of Electrical and Computer Engineering, Illinois Institute of Technology, Chicago, IL, 60616, USA
| | - Wenyuan Qi
- Medical Imaging Research Center, Department of Electrical and Computer Engineering, Illinois Institute of Technology, Chicago, IL, 60616, USA
| | - Miles N Wernick
- Medical Imaging Research Center, Department of Electrical and Computer Engineering, Illinois Institute of Technology, Chicago, IL, 60616, USA
| | - P Hendrik Pretorius
- Department of Radiology, University of Massachusetts Medical School, Worcester, MA, 01655, USA
| | - Michael A King
- Department of Radiology, University of Massachusetts Medical School, Worcester, MA, 01655, USA
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