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Dundara Debeljuh D, Matheoud R, Zoccarato O, Pribanić I, Brambilla M, Jurković S. Characterization of myocardial perfusion imaging systems - an extension of quality metrics. Phys Med 2024; 125:104510. [PMID: 39216312 DOI: 10.1016/j.ejmp.2024.104510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 04/15/2024] [Accepted: 08/25/2024] [Indexed: 09/04/2024] Open
Abstract
PURPOSE The aim of this study was to evaluate the performance of myocardial perfusion imaging (MPI) systems in detecting perfusion defects (PDs). The defect perfusion index (DPI) was introduced to extend and further advance the current MPI quality metrics. METHODS An anthropomorphic phantom simulating normal and pathological myocardial perfusion conditions was imaged by various NaI-crystal detector systems with and without corrections for scatter (SC) and attenuation (AC) (Symbia, Symbia + SC, Symbia IQ + SCAC, Symbia IQ), and cadmium-zinc-telluride detector systems without corrections (DSPECT, D530c). The extent of PD and the summed score (SS) were obtained by comparing polar maps with ad hoc normal databases created for each MPI system by using phantom polar maps with normal perfusion. The segmental uptake (SU) and the global uniformity (GU) were evaluated. The DPI was calculated on segments included in the PD to minimize attenuation artifacts outside the PD. The 17 segmental model was used. RESULTS The highest level of uniformity of polar map was obtained for Symbia IQ + SCAC. D530c showed the highest extent of PD and dependence of the extent on the PD position. It showed in general the lowest SU values and the highest GU due to attenuation artifacts. Nevertheless, D530c outperforms other MPI systems in terms of PD detection, showing the highest DPI value. DSPECT system showed the lowest SS value, and DPI values comparable to NaI-crystal detector systems. CONCLUSION The DPI can be evaluated to investigate the intrinsic ability of MPI systems to detect PDs, whatever the quantitative post-processing software used.
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Affiliation(s)
- Dea Dundara Debeljuh
- Medical Physics and Radiation Protection Department, University Hospital Rijeka, Croatia; Radiology Department, General Hospital Pula, Pula, Croatia; Department of Medical Physics and Biophysics, Faculty of Medicine, University of Rijeka, Croatia
| | - Roberta Matheoud
- Department of Medical Physics, University Hospital "Maggiore della Carità", Novara, Italy
| | - Orazio Zoccarato
- Unit of Nuclear Medicine and Department of Cardiology, S. Maugeri Foundation, IRCCS, Scientific Institute of Veruno, Veruno, NO, Italy
| | - Ivan Pribanić
- Medical Physics and Radiation Protection Department, University Hospital Rijeka, Croatia; Department of Medical Physics and Biophysics, Faculty of Medicine, University of Rijeka, Croatia
| | - Marco Brambilla
- Department of Medical Physics, University Hospital "Maggiore della Carità", Novara, Italy
| | - Slaven Jurković
- Medical Physics and Radiation Protection Department, University Hospital Rijeka, Croatia; Department of Medical Physics and Biophysics, Faculty of Medicine, University of Rijeka, Croatia.
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Otani K, Zeniya T, Kawashima H, Moriguchi T, Nakano A, Han C, Murata S, Nishimura K, Koshino K, Yamahara K, Inubushi M, Iida H. Spatial and temporal tracking of multi-layered cells sheet using reporter gene imaging with human sodium iodide symporter: a preclinical study using a rat model of myocardial infarction. Eur J Nucl Med Mol Imaging 2024:10.1007/s00259-024-06889-2. [PMID: 39207487 DOI: 10.1007/s00259-024-06889-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2024] [Accepted: 08/14/2024] [Indexed: 09/04/2024]
Abstract
PURPOSE This study aimed to evaluate a novel technique for cell tracking by visualising the activity of the human sodium/iodide symporter (hNIS) after transplantation of hNIS-expressing multilayered cell sheets in a rat model of chronic myocardial infarction. METHODS Triple-layered cell sheets were generated from mouse embryonic fibroblasts (MEFs) derived from mice overexpressing hNIS (hNIS-Tg). Myocardial infarction was induced by permanent ligation of the left anterior descending coronary artery in F344 athymic rats, and a triple-layered MEFs sheets were transplanted to the infarcted area two weeks after surgery. To validate the temporal tracking and kinetic analysis of the transplanted MEFs sheets, sequential cardiac single-photon emission computed tomography (SPECT) examinations with a 99mTcO4- injection were performed. The cell sheets generated using MEFs of wild-type mice (WT) served as controls. RESULTS A significantly higher amount of 99mTcO4- was taken into the hNIS-Tg MEFs than into WT MEFs (146.1 ± 30.9-fold). The obvious accumulation of 99mTcO4- was observed in agreement with the region where hNIS-Tg MEFs were transplanted, and these radioactivities peaked 40-60 min after 99mTcO4- administration. The volume of distribution of the hNIS-Tg MEF sheets declined gradually after transplantation, implying cellular malfunction and a loss in the number of transplanted cells. CONCLUSION The reporter gene imaging with hNIS enables the serial tracking and quantitative kinetic analysis of cell sheets transplanted to infarcted hearts.
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Affiliation(s)
- Kentaro Otani
- Department of Molecular Pharmacology, National Cerebral and Cardiovascular Center Research Institute, Osaka, Japan
| | - Tsutomu Zeniya
- Graduate School of Science and Technology, Hirosaki University, Aomori, Japan
| | - Hidekazu Kawashima
- Radioisotope Research Center, Kyoto Pharmaceutical University, Kyoto, Japan
| | - Tetsuaki Moriguchi
- Tandem Accelerator Complex (UTTAC), University of Tsukuba, Ibaraki, Japan
| | - Atsushi Nakano
- Department of Research Promotion and Management, National Cerebral and Cardiovascular Center Research Institute, Osaka, Japan
| | - Chunlei Han
- Turku PET Centre, Turku University Hospital, Turku, Finland
| | - Shunsuke Murata
- Department of Preventive Medicine and Epidemiology, National Cerebral and Cardiovascular Center Research Institute, Osaka, Japan
| | - Kunihiro Nishimura
- Department of Preventive Medicine and Epidemiology, National Cerebral and Cardiovascular Center Research Institute, Osaka, Japan
| | - Kazuhiro Koshino
- Department of Systems and Informatics, Hokkaido Information University, Hokkaido, Japan
| | - Kenichi Yamahara
- Laboratory of Molecular and Cellular Therapy, Institute for Advanced Medical Sciences, Hyogo Medical University, Hyogo, Japan
| | - Masayuki Inubushi
- Division of Nuclear Medicine, Department of Radiology, Kawasaki Medical School, Okayama, Japan
| | - Hidehiro Iida
- Turku PET Centre, Turku University Hospital, Turku, Finland.
- Turku PET Centre, University of Turku and Turku University Hospital, Building 14, Kiinamyllynkatu 4-8, Turku, 20520, Finland.
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Bouchareb Y, AlSaadi A, Zabah J, Jain A, Al-Jabri A, Phiri P, Shi JQ, Delanerolle G, Sirasanagandla SR. Technological Advances in SPECT and SPECT/CT Imaging. Diagnostics (Basel) 2024; 14:1431. [PMID: 39001321 PMCID: PMC11241697 DOI: 10.3390/diagnostics14131431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2024] [Revised: 06/11/2024] [Accepted: 06/15/2024] [Indexed: 07/16/2024] Open
Abstract
Single photon emission tomography/computed tomography (SPECT/CT) is a mature imaging technology with a dynamic role in the diagnosis and monitoring of a wide array of diseases. This paper reviews the technological advances, clinical impact, and future directions of SPECT and SPECT/CT imaging. The focus of this review is on signal amplifier devices, detector materials, camera head and collimator designs, image reconstruction techniques, and quantitative methods. Bulky photomultiplier tubes (PMTs) are being replaced by position-sensitive PMTs (PSPMTs), avalanche photodiodes (APDs), and silicon PMs to achieve higher detection efficiency and improved energy resolution and spatial resolution. Most recently, new SPECT cameras have been designed for cardiac imaging. The new design involves using specialised collimators in conjunction with conventional sodium iodide detectors (NaI(Tl)) or an L-shaped camera head, which utilises semiconductor detector materials such as CdZnTe (CZT: cadmium-zinc-telluride). The clinical benefits of the new design include shorter scanning times, improved image quality, enhanced patient comfort, reduced claustrophobic effects, and decreased overall size, particularly in specialised clinical centres. These noticeable improvements are also attributed to the implementation of resolution-recovery iterative reconstructions. Immense efforts have been made to establish SPECT and SPECT/CT imaging as quantitative tools by incorporating camera-specific modelling. Moreover, this review includes clinical examples in oncology, neurology, cardiology, musculoskeletal, and infection, demonstrating the impact of these advancements on clinical practice in radiology and molecular imaging departments.
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Affiliation(s)
- Yassine Bouchareb
- Department of Radiology & Molecular Imaging, College of Medicine and Health Sciences, Sultan Qaboos University, Muscat 123, Oman
| | - Afrah AlSaadi
- Department of Radiology & Molecular Imaging, College of Medicine and Health Sciences, Sultan Qaboos University, Muscat 123, Oman
| | - Jawa Zabah
- Department of Radiology & Molecular Imaging, Sultan Qaboos University Hospital, Muscat 123, Oman
| | - Anjali Jain
- Sultan Qaboos Comprehensive Cancer Care and Research Centre, Department of Radiology, Muscat 123, Oman
| | - Aziza Al-Jabri
- Department of Radiology & Molecular Imaging, Sultan Qaboos University Hospital, Muscat 123, Oman
| | - Peter Phiri
- Southern Health NHS Foundation Trust, Southampton SO40 2RZ, UK
- Psychology Department, Faculty of Environmental and Life Sciences, University of Southampton, Southampton SO17 1BJ, UK
| | - Jian Qing Shi
- Southern Health NHS Foundation Trust, Southampton SO40 2RZ, UK
- Southern University of Science and Technology, Southampton, UK
- Southern University of Science and Technology, Shenzhen 518055, China
| | - Gayathri Delanerolle
- Southern Health NHS Foundation Trust, Southampton SO40 2RZ, UK
- University of Birmingham, Birmingham, UK
| | - Srinivasa Rao Sirasanagandla
- Department of Human & Clinical Anatomy, College of Medicine and Health Sciences, Sultan Qaboos University, Muscat 123, Oman
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Fukami M, Matsutomo N, Hashimoto T, Yamamoto T, Sasaki M. Compressed sensing reconstruction shortens the acquisition time for myocardial perfusion imaging: a simulation study. Radiol Phys Technol 2023; 16:397-405. [PMID: 37382801 DOI: 10.1007/s12194-023-00730-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 06/16/2023] [Accepted: 06/17/2023] [Indexed: 06/30/2023]
Abstract
Compressed sensing (CS) has been used to improve image quality in single-photon emission tomography (SPECT) imaging. However, the effects of CS on image quality parameters in myocardial perfusion imaging (MPI) have not been investigated in detail. This preliminary study aimed to compare the performance of CS-iterative reconstruction (CS-IR) with filtered back-projection (FBP) and maximum likelihood expectation maximization (ML-EM) on their ability to reduce the acquisition time of MPI. A digital phantom that mimicked the left ventricular myocardium was created. Projection images with 120 and 30 directions (360°), and with 60 and 15 directions (180°) were generated. The SPECT images were reconstructed using FBP, ML-EM, and CS-IR. The coefficient of variation (CV) for the uniformity of myocardial accumulation, septal wall thickness, and contrast ratio (Contrast) of the defect/normal lateral wall were calculated for evaluation. The simulation was performed ten times. The CV of CS-IR was lower than that of FBP and ML-EM in both 360° and 180° acquisitions. The septal wall thickness of CS-IR at the 360° acquisition was inferior to that of ML-EM, with a difference of 2.5 mm. Contrast did not differ between ML-EM and CS-IR for the 360° and 180° acquisitions. The CV for the quarter-acquisition time in CS-IR was lower than that for the full-acquisition time in the other reconstruction methods. CS-IR has the potential to reduce the acquisition time of MPI.
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Affiliation(s)
- Mitsuha Fukami
- Department of Medical Radiological Technology, Faculty of Health Sciences, Kyorin University, 5-4-1 Shimorenjaku, Mitaka-shi, Tokyo, 181-8612, Japan.
- Department of Medical Quantum Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka-shi, Japan.
| | - Norikazu Matsutomo
- Department of Medical Radiological Technology, Faculty of Health Sciences, Kyorin University, 5-4-1 Shimorenjaku, Mitaka-shi, Tokyo, 181-8612, Japan
| | - Takeyuki Hashimoto
- Department of Medical Radiological Technology, Faculty of Health Sciences, Kyorin University, 5-4-1 Shimorenjaku, Mitaka-shi, Tokyo, 181-8612, Japan
| | - Tomoaki Yamamoto
- Department of Medical Radiological Technology, Faculty of Health Sciences, Kyorin University, 5-4-1 Shimorenjaku, Mitaka-shi, Tokyo, 181-8612, Japan
| | - Masayuki Sasaki
- Department of Medical Quantum Science, Faculty of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka-shi, Fukuoka, 812-8582, Japan
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Wei H, Wu J, Han K, Hu G, Wang H, Guo X, Liu H, Wu Z, Li S. CMR validation of left ventricular volumes and ejection fraction measured by the IQ-SPECT system in patients with small heart size. EJNMMI Res 2023; 13:33. [PMID: 37093329 PMCID: PMC10126186 DOI: 10.1186/s13550-023-00987-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Accepted: 04/19/2023] [Indexed: 04/25/2023] Open
Abstract
BACKGROUND The IQ-SPECT system is equipped with multifocal collimators and uses ordered-subset conjugate gradient minimization (OSCGM) as its reconstruction algorithm, achieving a shorter acquisition time than conventional SPECT. Left ventricular ejection fraction (LVEF) is overestimated by conventional SPECT in patients with small heart size. In this study, we compared IQ-SPECT with conventional SPECT and cardiovascular magnetic resonance (CMR) for the estimation of LVEF in patients with small hearts (males: EDV ≤ 60 ml, ESV ≤ 25 ml; females: EDV ≤ 45 ml, ESV ≤ 20 ml). METHODS The study consisted of 49 consecutive patients (20 normal and 29 with small heart size) undergoing gated myocardial perfusion imaging (GMPI) with a 99mTc-labelled agent during stress or rest to assess the risk of coronary artery disease (CAD). The data were reconstructed using filtered back-projection (FBP) for conventional SPECT and OSCGM for IQ-SPECT. ESV, EDV, and LVEF were calculated using quantitative gated SPECT (QGS). To determine the optimal ordered-subset reconstruction parameters, we compared the LVEF from SPECT to the corresponding measurement from CMR. RESULTS EDV, ESV, and LVEF values obtained from IQ-SPECT and conventional SPECT showed that the results of these two forms of SPECT were significantly correlated, although the EDV and ESV obtained by IQ-SPECT were higher than those obtained by conventional SPECT. IQ-SPECT yielded lower LVEF measurements than conventional SPECT (normal heart size: 50.6 ± 4.3% vs. 73.4 ± 8.4%, P = 0.002; small heart size: 62.1 ± 7.8% vs. 75.0 ± 11.4%, P < 0.001). There were no significant differences in LVEF measurements made by IQ-SPECT and CMR (normal heart size: 50.6 ± 4.3% vs. 53.2 ± 5.8%, P > 0.05; small heart size: 62.1 ± 7.8% vs. 64.6 ± 8.8%, P > 0.05). Five subsets (S) and 12 iterations (I) did not differ significantly in LVEF between CMR and IQ-SPECT for patients with small hearts (64.6 ± 8.8% vs. 62.1 ± 7.8%, P = 0.120), while 3 S and 10 I were the best parameters for patients with normal heart size (50.6 ± 4.3% vs. 53.1 ± 5.8%, P = 0.117). CONCLUSION With CMR as the standard, IQ-SPECT yields more reliable LVEF values than conventional SPECT for populations with small heart size. The best reconstruction parameters from IQ-SPECT were 5 S and 12 I for patients with small hearts.
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Affiliation(s)
- Hua Wei
- Department of Nuclear Medicine, First Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, People's Republic of China
- Collaborative Innovation Center for Molecular Imaging of Precision Medicine, Shanxi Medical University, Taiyuan, 030001, Shanxi, People's Republic of China
- Center for Post-Doctoral Studies, Second Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, People's Republic of China
| | - Jiaojiao Wu
- Department of Nuclear Medicine, First Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, People's Republic of China
- Collaborative Innovation Center for Molecular Imaging of Precision Medicine, Shanxi Medical University, Taiyuan, 030001, Shanxi, People's Republic of China
| | - Ke Han
- Department of Nuclear Medicine, First Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, People's Republic of China
- Collaborative Innovation Center for Molecular Imaging of Precision Medicine, Shanxi Medical University, Taiyuan, 030001, Shanxi, People's Republic of China
| | - Guang Hu
- Department of Nuclear Medicine, First Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, People's Republic of China
- Collaborative Innovation Center for Molecular Imaging of Precision Medicine, Shanxi Medical University, Taiyuan, 030001, Shanxi, People's Republic of China
| | - Hongliang Wang
- Department of Nuclear Medicine, First Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, People's Republic of China
- Collaborative Innovation Center for Molecular Imaging of Precision Medicine, Shanxi Medical University, Taiyuan, 030001, Shanxi, People's Republic of China
| | - Xiaoshan Guo
- Department of Nuclear Medicine, First Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, People's Republic of China
| | - Haiyan Liu
- Department of Nuclear Medicine, First Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, People's Republic of China
- Collaborative Innovation Center for Molecular Imaging of Precision Medicine, Shanxi Medical University, Taiyuan, 030001, Shanxi, People's Republic of China
| | - Zhifang Wu
- Department of Nuclear Medicine, First Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, People's Republic of China
- Collaborative Innovation Center for Molecular Imaging of Precision Medicine, Shanxi Medical University, Taiyuan, 030001, Shanxi, People's Republic of China
| | - Sijin Li
- Department of Nuclear Medicine, First Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, People's Republic of China.
- Collaborative Innovation Center for Molecular Imaging of Precision Medicine, Shanxi Medical University, Taiyuan, 030001, Shanxi, People's Republic of China.
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Ichikawa H, Shibutani T, Shimada H, Okuda K, Kato T, Nosaka H, Nagaki A, Onoguchi M. Feasibility of using counts-per-volume approach with a new SPECT phantom to optimize the relationship between administered dose and acquisition time. Radiol Phys Technol 2023; 16:244-253. [PMID: 36959492 DOI: 10.1007/s12194-023-00713-6] [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: 12/03/2022] [Revised: 03/10/2023] [Accepted: 03/11/2023] [Indexed: 03/25/2023]
Abstract
We developed a phantom for single-photon emission computed tomography (SPECT), with the objective of assessing image quality to optimize administered dose and acquisition time. We investigated whether the concept of counts-per-volume (CPV), which is used as a predictor of visual image quality in positron emission tomography, can be used to estimate the acquisition time required for each SPECT image. QIRE phantoms for the head (QIRE-h) and torso (QIRE-t) were developed to measure four physical indicators of image quality in a single scan: uniformity, contrast of both hot and defective lesions with respect to the background, and linearity between radioactivity concentration and count density. The target organ's CPV (TCPV), sharpness index (SI), and contrast-to-noise ratio (CNR) were measured for QIRE-h and QIRE-t phantoms, and for anthropomorphic brain and torso phantoms. The SPECT image quality of the four phantoms was visually assessed on a 5-point scale. The acquisition time and TCPV were correlated for all four phantoms. The SI and CNR values were nearly identical for the QIRE and anthropomorphic phantoms with comparable TCPV. The agreement between the visual scores of QIRE-h and brain phantoms, as well as QIRE-t and torso phantoms, was moderate and substantial, respectively. Comparison of SPECT image quality between QIRE and anthropomorphic phantoms revealed close agreement in terms of physical indicators and visual assessments. Therefore, the TCPV concept can also be applied to SPECT images of QIRE phantoms, and optimization of imaging parameters for nuclear medicine examinations may be possible using QIRE phantoms alone.
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Affiliation(s)
- Hajime Ichikawa
- Department of Radiology, Toyohashi Municipal Hospital, 50 Aza Hachiken Nishi, Aotake-Cho, Toyohashi, Aichi, 4418570, Japan
- Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 5-11-80 Kodatsuno, Kanazawa, Ishikawa, 9200942, Japan
| | - Takayuki Shibutani
- Department of Quantum Medical Technology, Graduate School of Medical Sciences, Kanazawa University, 5-11-80 Kodatsuno, Kanazawa, Ishikawa, 9200942, Japan
| | - Hideki Shimada
- Department of Radiology, Toyohashi Municipal Hospital, 50 Aza Hachiken Nishi, Aotake-Cho, Toyohashi, Aichi, 4418570, Japan
| | - Koichi Okuda
- Department of Radiation Science, Hirosaki University Graduate School of Health Sciences, 66-1 Honcho, Hirosaki, Aomori, 0368564, Japan
| | - Toyohiro Kato
- Department of Radiology, Toyohashi Municipal Hospital, 50 Aza Hachiken Nishi, Aotake-Cho, Toyohashi, Aichi, 4418570, Japan
| | - Hiroki Nosaka
- Department of Quantum Medical Technology, Graduate School of Medical Sciences, Kanazawa University, 5-11-80 Kodatsuno, Kanazawa, Ishikawa, 9200942, Japan
- Clinical Imaging Center for Healthcare, Nippon Medical School, 1-12-15 Sendagi, Bunkyo, Tokyo, 1130022, Japan
| | - Akio Nagaki
- Department of Radiological Technology, Kurashiki Central Hospital, 1-1-1 Miwa, Kurashiki, Okayama, 7108602, Japan
| | - Masahisa Onoguchi
- Department of Quantum Medical Technology, Graduate School of Medical Sciences, Kanazawa University, 5-11-80 Kodatsuno, Kanazawa, Ishikawa, 9200942, Japan.
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Sohlberg A, Kangasmaa T, Constable C, Tikkakoski A. Comparison of deep learning-based denoising methods in cardiac SPECT. EJNMMI Phys 2023; 10:9. [PMID: 36752847 PMCID: PMC9908801 DOI: 10.1186/s40658-023-00531-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Accepted: 02/01/2023] [Indexed: 02/09/2023] Open
Abstract
BACKGROUND Myocardial perfusion SPECT (MPS) images often suffer from artefacts caused by low-count statistics. Poor-quality images can lead to misinterpretations of perfusion defects. Deep learning (DL)-based methods have been proposed to overcome the noise artefacts. The aim of this study was to investigate the differences among several DL denoising models. METHODS Convolution neural network (CNN), residual neural network (RES), UNET and conditional generative adversarial neural network (cGAN) were generated and trained using ordered subsets expectation maximization (OSEM) reconstructed MPS studies acquired with full, half, three-eighths and quarter acquisition time. All DL methods were compared against each other and also against images without DL-based denoising. Comparisons were made using half and quarter time acquisition data. The methods were evaluated in terms of noise level (coefficient of variation of counts, CoV), structural similarity index measure (SSIM) in the myocardium of normal patients and receiver operating characteristic (ROC) analysis of realistic artificial perfusion defects inserted into normal MPS scans. Total perfusion deficit scores were used as observer rating for the presence of a perfusion defect. RESULTS All the DL denoising methods tested provided statistically significantly lower noise level than OSEM without DL-based denoising with the same acquisition time. CoV of the myocardium counts with the different DL noising methods was on average 7% (CNN), 8% (RES), 7% (UNET) and 14% (cGAN) lower than with OSEM. All DL methods also outperformed full time OSEM without DL-based denoising in terms of noise level with both half and quarter acquisition time, but this difference was not statistically significant. cGAN had the lowest CoV of the DL methods at all noise levels. Image quality and polar map uniformity of DL-denoised images were also better than reduced acquisition time OSEM's. SSIM of the reduced acquisition time OSEM was overall higher than with the DL methods. The defect detection performance of full time OSEM measured as area under the ROC curve (AUC) was on average 0.97. Half time OSEM, CNN, RES and UNET provided equal or nearly equal AUC. However, with quarter time data CNN, RES and UNET had an average AUC of 0.93, which was lower than full time OSEM's AUC, but equal to quarter acquisition time OSEM. cGAN did not achieve the defect detection performance of the other DL methods. Its average AUC with half time data was 0.94 and 0.91 with quarter time data. CONCLUSIONS DL-based denoising effectively improved noise level with slightly lower perfusion defect detection performance than full time reconstruction. cGAN achieved the lowest noise level, but at the same time the poorest defect detection performance among the studied DL methods.
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Affiliation(s)
- Antti Sohlberg
- Department of Clinical Physiology and Nuclear Medicine, Päijät-Häme Central Hospital, Lahti, Finland. .,HERMES Medical Solutions, Stockholm, Sweden.
| | - Tuija Kangasmaa
- grid.417201.10000 0004 0628 2299Department of Clinical Physiology and Nuclear Medicine, Vaasa Central Hospital, Vaasa, Finland
| | - Chris Constable
- grid.451682.c0000 0004 0581 1128HERMES Medical Solutions, Stockholm, Sweden
| | - Antti Tikkakoski
- grid.412330.70000 0004 0628 2985Clinical Physiology and Nuclear Medicine, Tampere University Hospital, Tampere, Finland
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Werner RA, Martinez RB, Marcus C, Kruse MJ, Sheikhbahaei S, Solnes LB, Higuchi T, Javadi MS, Rowe SP. Diagnostic performance of IQ·SPECT with high-speed scanning: A preliminary quality control study in obese patients. J Nucl Cardiol 2022; 29:3443-3449. [PMID: 35386095 DOI: 10.1007/s12350-022-02928-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Accepted: 02/02/2022] [Indexed: 01/18/2023]
Abstract
BACKGROUND IQ·SPECT is a recently introduced collimator design for myocardial perfusion imaging (MPI). Little data exist on use of this collimator type in obese patients, particularly Class 2 or 3 [body mass index (BMI) > 35 kg/m2]. METHODS Two consecutive rest-stress MPI scans were prospectively acquired using a conventional collimator and IQ·SPECT (acquisition times of 20 and 7 minutes, respectively) in 20 patients with a BMI of >30 kg/m2. Assigned by two blinded, independent readers, image quality (on a 5-point scale) and metrics of myocardial perfusion [summed stress score (SSS), summed rest score (SRS) and summed difference score (SDS)] were compared. Software-based left ventricular ejection fraction (EF) was also correlated. RESULTS Mean BMI was 39.6 ± 7.6 kg/m2. Class 2 or 3 obesity was present in 12 patients (BMI, 44.1 ± 6.8 kg/m2). Gated/non-gated images from IQ·SPECT revealed fair to good quality scores (median ≥ 3.25), which were inferior to the conventional collimator (median ≥ 4.0; P ≤ 0.01). Significant correlative indices were achieved when comparing IQ·SPECT and conventional collimators for EF values (r = 0.86, P < 0.01), SSS (r = 0.75, P < 0.0001) and SRS (r = 0.60, P < 0.005), but not for SDS (r = 0.15). CONCLUSION IQ·SPECT was comparable to conventional SPECT in obese patients. The reduced acquisition time of IQ·SPECT may allow for improved throughput with no loss in diagnostic accuracy.
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Affiliation(s)
- Rudolf A Werner
- Division of Nuclear Medicine and Molecular Imaging, The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Department of Nuclear Medicine, University Hospital Würzburg, Würzburg, Germany
- Comprehensive Heart Failure Center, University Hospital Würzburg, Würzburg, Germany
| | - Ricardo Bello Martinez
- Division of Nuclear Medicine and Molecular Imaging, The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Charles Marcus
- Division of Nuclear Medicine and Molecular Imaging, Department of Radiology and Imaging Sciences, Emory University School of Medicine, Atlanta, GA, USA
| | - Matthew J Kruse
- Division of Nuclear Medicine and Molecular Imaging, The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Sara Sheikhbahaei
- Division of Nuclear Medicine and Molecular Imaging, The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Lilja B Solnes
- Division of Nuclear Medicine and Molecular Imaging, The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Takahiro Higuchi
- Department of Nuclear Medicine, University Hospital Würzburg, Würzburg, Germany
- Comprehensive Heart Failure Center, University Hospital Würzburg, Würzburg, Germany
- Faculty of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Mehrbod S Javadi
- Division of Nuclear Medicine and Molecular Imaging, The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Steven P Rowe
- Division of Nuclear Medicine and Molecular Imaging, The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
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Shibutani T. [[Nuclear Medicine] 3. Cardiac Phantom]. Nihon Hoshasen Gijutsu Gakkai Zasshi 2022; 78:513-519. [PMID: 35598960 DOI: 10.6009/jjrt.2022-2019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Affiliation(s)
- Takayuki Shibutani
- Department of Quantum Medical Technology, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University
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10
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Shibutani T, Nakajima K, Yoneyama H, Konishi T, Okuda K, Onoguchi M, Kinuya S. The utility of heart-to-mediastinum ratio using a planar image created from IQ-SPECT with Iodine-123 meta-iodobenzylguanidine. J Nucl Cardiol 2021; 28:2569-2577. [PMID: 32103408 DOI: 10.1007/s12350-020-02081-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Accepted: 02/10/2020] [Indexed: 10/24/2022]
Abstract
AIMS 123I-labeled meta-iodobenzylguanidine (MIBG) has used a planar image to measure the heart-to-mediastinum ratio (HMR). However, planar images are not available from IQ-SPECT with SMARTZOOM collimator due to its multi-focal collimation. Since we created the planar-equivalent (IQ-planar) images by adding all slices of the IQ-SPECT coronal image. The aim of this study was to demonstrate the utility of the new method for calculating HMR. METHODS The planar image and transverse images of IQ-SPECT with attenuation and scatter corrections (ACSC) and without ACSC (NC) were obtained. Multi-planar reconstruction and ray-summation processing were applied to create IQ-planar images with NC and ACSC. Linear regression between the measured HMR from the planar image and the mathematically calculated HMR was used to calibrate HMR to standardized values. RESULTS Scatterplots and linear regression lines between planar and IQ-planar HMRs before and after cross-calibration showed systematic differences in both NC and ACSC conditions. The IQ-planar HMR with NC and ACSC was significantly higher compared with that of the conventional planar image. However, the IQ-planar HMR with NC and ACSC after cross-calibration was similar to the standardized HMR calculated by planar image. CONCLUSION The IQ-planar HMR using the new ray-summation processing method could be used along with the conventional planar HMR.
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Affiliation(s)
- Takayuki Shibutani
- Department of Quantum Medical Technology, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 5-11-80, Kodatsuno, Kanazawa, Ishikawa, Japan.
| | - Kenichi Nakajima
- Department of Functional Imaging and Artificial Intelligence, Kanazawa University, Kanazawa, Ishikawa, 920-8641, Japan
| | - Hiroto Yoneyama
- Department of Radiological Technology, Kanazawa University Hospital, Kanazawa, Ishikawa, 920-8641, Japan
| | - Takahiro Konishi
- Department of Radiological Technology, Kanazawa University Hospital, Kanazawa, Ishikawa, 920-8641, Japan
| | - Koichi Okuda
- Department of Physics, Kanazawa Medical University, Uchinada, Kahoku, Japan
| | - Masahisa Onoguchi
- Department of Quantum Medical Technology, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 5-11-80, Kodatsuno, Kanazawa, Ishikawa, Japan
| | - Seigo Kinuya
- Department of Nuclear Medicine, Kanazawa University Hospital, Kanazawa, Japan
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11
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Shiri I, AmirMozafari Sabet K, Arabi H, Pourkeshavarz M, Teimourian B, Ay MR, Zaidi H. Standard SPECT myocardial perfusion estimation from half-time acquisitions using deep convolutional residual neural networks. J Nucl Cardiol 2021; 28:2761-2779. [PMID: 32347527 DOI: 10.1007/s12350-020-02119-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 03/26/2020] [Indexed: 12/12/2022]
Abstract
INTRODUCTION The purpose of this work was to assess the feasibility of acquisition time reduction in MPI-SPECT imaging using deep leering techniques through two main approaches, namely reduction of the acquisition time per projection and reduction of the number of angular projections. METHODS SPECT imaging was performed using a fixed 90° angle dedicated dual-head cardiac SPECT camera. This study included a prospective cohort of 363 patients with various clinical indications (normal, ischemia, and infarct) referred for MPI-SPECT. For each patient, 32 projections for 20 seconds per projection were acquired using a step and shoot protocol from the right anterior oblique to the left posterior oblique view. SPECT projection data were reconstructed using the OSEM algorithm (6 iterations, 4 subsets, Butterworth post-reconstruction filter). For each patient, four different datasets were generated, namely full time (20 seconds) projections (FT), half-time (10 seconds) acquisition per projection (HT), 32 full projections (FP), and 16 half projections (HP). The image-to-image transformation via the residual network was implemented to predict FT from HT and predict FP from HP images in the projection domain. Qualitative and quantitative evaluations of the proposed framework was performed using a tenfold cross validation scheme using the root mean square error (RMSE), absolute relative error (ARE), structural similarity index, peak signal-to-noise ratio (PSNR) metrics, and clinical quantitative parameters. RESULTS The results demonstrated that the predicted FT had better image quality than the predicted FP images. Among the generated images, predicted FT images resulted in the lowest error metrics (RMSE = 6.8 ± 2.7, ARE = 3.1 ± 1.1%) and highest similarity index and signal-to-noise ratio (SSIM = 0.97 ± 1.1, PSNR = 36.0 ± 1.4). The highest error metrics (RMSE = 32.8 ± 12.8, ARE = 16.2 ± 4.9%) and the lowest similarity and signal-to-noise ratio (SSIM = 0.93 ± 2.6, PSNR = 31.7 ± 2.9) were observed for HT images. The RMSE decreased significantly (P value < .05) for predicted FT (8.0 ± 3.6) relative to predicted FP (6.8 ± 2.7). CONCLUSION Reducing the acquisition time per projection significantly increased the error metrics. The deep neural network effectively recovers image quality and reduces bias in quantification metrics. Further research should be undertaken to explore the impact of time reduction in gated MPI-SPECT.
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Affiliation(s)
- Isaac Shiri
- Division of Nuclear Medicine and Molecular Imaging, Geneva University Hospital, 1211, Geneva 4, Switzerland
| | | | - Hossein Arabi
- Division of Nuclear Medicine and Molecular Imaging, Geneva University Hospital, 1211, Geneva 4, Switzerland
| | - Mozhgan Pourkeshavarz
- Rajaie Cardiovascular Medical and Research Center, Iran University of Medical Science, Tehran, Iran
- Department of Computer Engineering, Shahid Beheshti University, Tehran, Iran
| | - Behnoosh Teimourian
- Research Center for Molecular and Cellular Imaging, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohammad Reza Ay
- Research Center for Molecular and Cellular Imaging, Tehran University of Medical Sciences, Tehran, Iran
- Department of Medical Physics and Biomedical Engineering, Tehran University of Medical Sciences, Tehran, Iran
| | - Habib Zaidi
- Division of Nuclear Medicine and Molecular Imaging, Geneva University Hospital, 1211, Geneva 4, Switzerland.
- Geneva University Neurocenter, Geneva University, Geneva, Switzerland.
- Department of Nuclear Medicine and Molecular Imaging, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.
- Department of Nuclear Medicine, University of Southern Denmark, Odense, Denmark.
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12
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Chaudhari AJ, Badawi RD. Application-specific nuclear medical in vivoimaging devices. Phys Med Biol 2021; 66. [PMID: 33770765 DOI: 10.1088/1361-6560/abf275] [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: 11/05/2019] [Accepted: 03/26/2021] [Indexed: 11/11/2022]
Abstract
Nuclear medical imaging devices, such as those enabling photon emission imaging (gamma camera, single photon emission computed tomography, or positron emission imaging), that are typically used in today's clinics are optimized for assessing large portions of the human body, and are classified as whole-body imaging systems. These systems have known limitations for organ imaging, therefore application-specific devices have been designed, constructed and evaluated. These devices, given their compact nature and superior technical characteristics, such as their higher detection sensitivity and spatial resolution for organ imaging compared to whole-body imaging systems, have shown promise for niche applications. Several of these devices have further been integrated with complementary anatomical imaging devices. The objectives of this review article are to (1) provide an overview of such application-specific nuclear imaging devices that were developed over the past two decades (in the twenty-first century), with emphasis on brain, cardiac, breast, and prostate imaging; and (2) discuss the rationale, advantages and challenges associated with the translation of these devices for routine clinical imaging. Finally, a perspective on the future prospects for application-specific devices is provided, which is that sustained effort is required both to overcome design limitations which impact their utility (where these exist) and to collect the data required to define their clinical value.
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Affiliation(s)
- Abhijit J Chaudhari
- Department of Radiology, University of California Davis, Sacramento, CA 95817, United States of America.,Center for Molecular and Genomic Imaging, University of California Davis, Davis, CA 95616, United States of America
| | - Ramsey D Badawi
- Department of Radiology, University of California Davis, Sacramento, CA 95817, United States of America.,Department of Biomedical Engineering, University of California Davis, Davis, CA 95616, United States of America
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13
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Leva L, Matheoud R, Sacchetti G, Carriero A, Brambilla M. Agreement between left ventricular ejection fraction assessed in patients with gated IQ-SPECT and conventional imaging. J Nucl Cardiol 2020; 27:1714-1724. [PMID: 30298371 DOI: 10.1007/s12350-018-1457-7] [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: 07/26/2018] [Accepted: 09/17/2018] [Indexed: 11/28/2022]
Abstract
BACKGROUND The aim of the study was to assess the agreement between the left ventricular ejection fraction (LVEF) values obtained with IQ-SPECT and those obtained with a conventional gamma camera equipped with low-energy high-resolution (LEHR), considered as the method of reference. METHODS Gated-stress MPI using 99mTc-tetrofosmin was performed in 55 consecutive patients. The patients underwent two sequential acquisitions (Method A and B) performed on Symbia-IQ SPECT with different acquisition times and one (Method C) on a Ecam SPECT equipped with LEHR collimators. The values of the different datasets were compared using the Bland-Altman analysis method: the bias and the limits of agreement (LA) were estimated in a head-to-head comparison of the three protocols. RESULTS In the (Method A-Method C) comparison for LVEF, the bias was 3.8% and the LAs ranged from - 9.3% to 16.8%. The agreement was still lower between Method B and C, whilst only slightly improved when Methods A and B were compared. CONCLUSIONS The wide amplitude in LA intervals of about 30% indicates that IQ and LEHR GSPECT are not interchangeable. The values obtained with IQ-SPECT should only be used with caution when evaluating the functional state of the heart.
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Affiliation(s)
- Lucia Leva
- Department of Nuclear Medicine, University Hospital 'Maggiore della Carità', Novara, Italy
| | - Roberta Matheoud
- Department of Medical Physics, University Hospital 'Maggiore della Carità', Novara, Italy
| | - Gianmauro Sacchetti
- Department of Nuclear Medicine, University Hospital 'Maggiore della Carità', Novara, Italy
| | - Alessandro Carriero
- Department of Radiology, University Hospital 'Maggiore della Carità', Novara, Italy
| | - Marco Brambilla
- Department of Medical Physics, University Hospital 'Maggiore della Carità', Novara, Italy.
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14
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Dietze MMA, Kunnen B, Stella M, de Jong HWAM. Monte Carlo-based scatter correction for the SMARTZOOM collimator. EJNMMI Phys 2020; 7:49. [PMID: 32700063 PMCID: PMC7376766 DOI: 10.1186/s40658-020-00318-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Accepted: 07/07/2020] [Indexed: 11/10/2022] Open
Abstract
Background Myocardial perfusion imaging is a commonly performed SPECT protocol and hence it would be beneficial if its scan duration could be shortened. For traditional gamma cameras, two developments have separately shown to allow for a shortened scan duration: (i) reconstructing with Monte Carlo-based scatter correction instead of dual-energy window scatter correction and (ii) acquiring projections with the SMARTZOOM collimator instead of a parallel-hole collimator. This study investigates which reduction in scan duration can be achieved when both methods are combined in a single system. Results The SMARTZOOM collimator was implemented in a Monte Carlo-based reconstruction package and the implementation was validated through image quality phantom experiments. The potential for scan duration reduction was evaluated with a phantom configuration that is realistic for myocardial perfusion imaging. The original reconstruction quality was achieved in 76 ± 8% of the original scan duration when switching from dual-energy window scatter correction to Monte Carlo-based scatter correction. The original reconstruction quality was achieved in 56 ± 13% of the original scan duration when switching from the parallel-hole to the SMARTZOOM collimator. After combining both methods in a single system, the original reconstruction quality was achieved in 34 ± 7% of the original scan duration. Conclusions Monte Carlo-based scatter correction combined with the SMARTZOOM collimator can further decrease the scan duration in myocardial perfusion imaging.
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Affiliation(s)
- Martijn M A Dietze
- Radiology and Nuclear Medicine, University Medical Center Utrecht, Utrecht University, P.O. Box 85500, 3508, GA, Utrecht, The Netherlands. .,Image Sciences Institute, University Medical Center Utrecht, Utrecht University, P.O. Box 85500, 3508, GA, Utrecht, The Netherlands.
| | - Britt Kunnen
- Radiology and Nuclear Medicine, University Medical Center Utrecht, Utrecht University, P.O. Box 85500, 3508, GA, Utrecht, The Netherlands.,Image Sciences Institute, University Medical Center Utrecht, Utrecht University, P.O. Box 85500, 3508, GA, Utrecht, The Netherlands
| | - Martina Stella
- Radiology and Nuclear Medicine, University Medical Center Utrecht, Utrecht University, P.O. Box 85500, 3508, GA, Utrecht, The Netherlands
| | - Hugo W A M de Jong
- Radiology and Nuclear Medicine, University Medical Center Utrecht, Utrecht University, P.O. Box 85500, 3508, GA, Utrecht, The Netherlands.,Image Sciences Institute, University Medical Center Utrecht, Utrecht University, P.O. Box 85500, 3508, GA, Utrecht, The Netherlands
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15
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Pelletier-Galarneau M, Finnerty V, Tan S, Authier S, Gregoire J, Harel F. Assessment of left ventricular ejection fraction with cardiofocal collimators: Comparison between IQ-SPECT, planar equilibrium radionuclide angiography, and cardiac magnetic resonance. J Nucl Cardiol 2019; 26:1857-1864. [PMID: 29520572 DOI: 10.1007/s12350-018-1251-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Accepted: 02/26/2018] [Indexed: 11/25/2022]
Abstract
BACKGROUND IQ-SPECT has been shown to significantly reduce acquisition time and administered dose while preserving image quality in myocardial perfusion imaging. Whether IQ-SPECT provides accurate left ventricular ejection fractions (LVEF) with gated blood pool SPECT (GBPS) remains unknown. METHODS Sixty patients underwent IQ-SPECT GBPS and planar imaging. Among those patients, 11 underwent both cMRI and GBPS. GBPS LVEF, LVEDV, and LVESV were calculated using 2 validated software; QBS (Cedars-Sinai Medical Center, Los Angeles, USA) and MHI (Montreal Heart Institute, Montreal, Canada). LVEF, LVEDV, and LVESV obtained with the different modalities were compared. RESULTS Average planar LVEF was 48 ± 11% (mean ± SD), average LVEDV was 177 ± 59 mL (range 63 to 342 mL), and average LVESV was 96 ± 46 mL (range 16 to 234 mL). GBPS LVEF and their correlation coefficient with planar LVEF were 40 ± 12% (r = 0.70) and 44 ± 12% (r = 0.83) with QBS and MHI, respectively. Correlation coefficient between cMRI and planar LVEF was 0.65 and were 0.69 and 0.52 between cMRI and GBPS using QBS and MHI, respectively. CONCLUSIONS LVEF calculated with GBPS using IQ-SPECT correlates with planar measurements. Correlation is best using the MHI method and variation is independent of LVEDV.
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Affiliation(s)
- Matthieu Pelletier-Galarneau
- Department of Radiology and Nuclear Medicine, Montreal Heart Institute, 5000 Belanger, Montreal, QC, H1T1C8, Canada.
| | - Vincent Finnerty
- Department of Radiology and Nuclear Medicine, Montreal Heart Institute, 5000 Belanger, Montreal, QC, H1T1C8, Canada
| | - Stephanie Tan
- Department of Radiology and Nuclear Medicine, Montreal Heart Institute, 5000 Belanger, Montreal, QC, H1T1C8, Canada
| | - Sebastien Authier
- Department of Radiology and Nuclear Medicine, Montreal Heart Institute, 5000 Belanger, Montreal, QC, H1T1C8, Canada
| | - Jean Gregoire
- Department of Radiology and Nuclear Medicine, Montreal Heart Institute, 5000 Belanger, Montreal, QC, H1T1C8, Canada
| | - Francois Harel
- Department of Radiology and Nuclear Medicine, Montreal Heart Institute, 5000 Belanger, Montreal, QC, H1T1C8, Canada
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16
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Huang JY, Yen RF, Lee WC, Huang CK, Hsu PY, Cheng MF, Lu CC, Lin YH, Chien KL, Wu YW. Improved diagnostic accuracy of thallium-201 myocardial perfusion single-photon emission computed tomography with CT attenuation correction. J Nucl Cardiol 2019; 26:1584-1595. [PMID: 29484543 DOI: 10.1007/s12350-018-1230-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2017] [Accepted: 01/18/2018] [Indexed: 10/17/2022]
Abstract
BACKGROUND The benefits of attenuation correction (AC) in technetium-99m myocardial perfusion imaging (MPI) have been well established. However, the value of thallium (Tl-201) AC and routine computed tomography AC (CTAC) were less well established. The aims of this study were to evaluate the diagnostic performance of thallium (Tl-201) MPI with additional CTAC and to determine which participants would benefit most. METHODS AND RESULTS A total of 108 consecutive patients who underwent Tl-201 MPI and received coronary angiography within 3 months were enrolled. Diagnostic performance was determined by sensitivity, specificity, and receiver operating characteristic curve analysis. Subgroup analyses were performed using gender and obesity. CTAC improved the area under the curve (0.84 vs. 0.77, P = 0.037 at patient level), primarily due to a significant improvement in specificity (0.78 vs. 0.57, P = 0.013) and no significant difference in sensitivity (0.79 vs. 0.82, P = 0.75). In subgroup analysis, CTAC was most helpful in obese subjects, men, and especially right coronary artery lesions. CONCLUSIONS CTAC significantly improved diagnostic performance primarily by increasing the specificity, and the improvements were significantly greater in obese patients and male patients. These findings suggest that CTAC should be applied to Tl-201 MPI as routine clinical practice.
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Affiliation(s)
- Jei-Yie Huang
- Department of Nuclear Medicine, National Taiwan University Hospital and National Taiwan University College of Medicine, No. 7, Chung Shan S. Rd, Taipei City, 10002, Taiwan
- Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Room 501, No. 17, Xu-Zhou Road, Taipei City, 100, Taiwan
| | - Ruoh-Fang Yen
- Department of Nuclear Medicine, National Taiwan University Hospital and National Taiwan University College of Medicine, No. 7, Chung Shan S. Rd, Taipei City, 10002, Taiwan
| | - Wen-Chung Lee
- Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Room 501, No. 17, Xu-Zhou Road, Taipei City, 100, Taiwan
| | - Chun-Kai Huang
- Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Room 501, No. 17, Xu-Zhou Road, Taipei City, 100, Taiwan
- Department of Internal Medicine, National Taiwan University Hospital and National Taiwan University College of Medicine, No. 7, Chung Shan S. Rd, Taipei City, 10002, Taiwan
| | - Pei-Ying Hsu
- Department of Nuclear Medicine, National Taiwan University Hospital, Yun-Lin Branch, No.579, Sec. 2, Yunlin Rd., Douliu City, 640, Yun-Lin County, Taiwan
| | - Mei-Fang Cheng
- Department of Nuclear Medicine, National Taiwan University Hospital and National Taiwan University College of Medicine, No. 7, Chung Shan S. Rd, Taipei City, 10002, Taiwan
| | - Ching-Chu Lu
- Department of Nuclear Medicine, National Taiwan University Hospital and National Taiwan University College of Medicine, No. 7, Chung Shan S. Rd, Taipei City, 10002, Taiwan
- Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Room 501, No. 17, Xu-Zhou Road, Taipei City, 100, Taiwan
| | - Yen-Hung Lin
- Department of Internal Medicine, National Taiwan University Hospital and National Taiwan University College of Medicine, No. 7, Chung Shan S. Rd, Taipei City, 10002, Taiwan
| | - Kuo-Liong Chien
- Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Room 501, No. 17, Xu-Zhou Road, Taipei City, 100, Taiwan
- Department of Internal Medicine, National Taiwan University Hospital and National Taiwan University College of Medicine, No. 7, Chung Shan S. Rd, Taipei City, 10002, Taiwan
| | - Yen-Wen Wu
- Department of Nuclear Medicine, National Taiwan University Hospital and National Taiwan University College of Medicine, No. 7, Chung Shan S. Rd, Taipei City, 10002, Taiwan.
- Department of Internal Medicine, National Taiwan University Hospital and National Taiwan University College of Medicine, No. 7, Chung Shan S. Rd, Taipei City, 10002, Taiwan.
- Department of Nuclear Medicine, Far Eastern Memorial Hospital, No. 21, Sec. 2, Nanya S. Rd, Banciao Dist., New Taipei City, 220, Taiwan.
- Cardiology Division of Cardiovascular Medical Center, Far Eastern Memorial Hospital, No. 21, Sec. 2, Nanya S. Rd., Banciao Dist., New Taipei City, 220, Taiwan.
- National Yang-Ming University School of Medicine, No.155, Sec.2, Linong Street, Taipei City, 112, Taiwan.
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Abbott BG, Case JA, Dorbala S, Einstein AJ, Galt JR, Pagnanelli R, Bullock-Palmer RP, Soman P, Wells RG. Contemporary Cardiac SPECT Imaging-Innovations and Best Practices: An Information Statement from the American Society of Nuclear Cardiology. Circ Cardiovasc Imaging 2019; 11:e000020. [PMID: 30354679 DOI: 10.1161/hci.0000000000000020] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Brian G Abbott
- Warren Alpert Medical School, Brown University, Providence, RI (B.G.A.)
| | - James A Case
- Cardiovascular Imaging Technologies, Kansas City, MO (J.A.C.)
| | - Sharmila Dorbala
- Harvard Medical School, Brigham and Women's Hospital, Boston, MA (S.D.)
| | - Andrew J Einstein
- Columbia University Irving Medical Center and New York-Presbyterian Hospital, New York, NY (A.J.E.)
| | - James R Galt
- Emory University School of Medicine, Atlanta, GA (J.R.G.)
| | | | | | - Prem Soman
- Department of Medicine, University of Pittsburgh, Pittsburgh, PA (P.S.)
| | - R Glenn Wells
- University of Ottawa Heart Institute, Ottawa, Canada (R.G.W.)
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18
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Liga R, Gimelli A. Automatic evaluation of myocardial perfusion on SPECT: Need for "Normality". J Nucl Cardiol 2019; 26:786-789. [PMID: 29071669 DOI: 10.1007/s12350-017-1097-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Accepted: 10/05/2017] [Indexed: 11/30/2022]
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19
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Kim JY, Park HC, Kim SJ, Chang HS, Choi HJ, Kim YH. Assessment of Left Ventricular Ejection Fraction by Thallium-201 Myocardial SPECT-CT in Patients with Angina Pectoris: Comparison with 2D Echocardiography. Nucl Med Mol Imaging 2019; 53:136-143. [PMID: 31057685 DOI: 10.1007/s13139-019-00575-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Revised: 01/04/2019] [Accepted: 01/08/2019] [Indexed: 10/27/2022] Open
Abstract
Purpose Left ventricular (LV) ejection fraction (EF) is an important parameter for assessing cardiac systolic function and predicting prognosis in patients with cardiovascular disease. The aim of this study was to evaluate the feasibility of assessing LVEF by Tl-201 hybrid myocardial single-photon emission computed tomography (SPECT)/CT using two attenuation correction methods in patients with angina pectoris. Methods A total of 339 patients with angina pectoris (62.8 ± 12.9 years, male:female = 206:133) were analyzed. All patients underwent Tl-201 myocardial SPECT/CT and transthoracic two-dimensional (2D) echocardiograph. We compared LVEF assessed by SPECT/CT using two attenuation correction methods: CT-based attenuation correction (CTAC) and non-attenuation correction (non-AC) methods and 2D echocardiography. Results LVEF assessed by either of the two attenuation correction techniques and 2D echocardiography showed moderate correlation in all patients with angina pectoris (r = 0.487 for CTAC and r = 0.473 for non-AC, p < 0.001). Results were similar in the subgroup of patients with perfusion abnormalities on myocardial SPECT/CT images. Overall diagnostic performances were similar for the CTAC and non-AC methods for evaluating normal and decreased LVEF by myocardial SPECT/CT. Conclusion LVEF measured by the CTAC method of Tl-201-gated myocardial SPECT/CT was comparable with the conventional non-AC method in patients with angina pectoris and in the subgroup of patients with perfusion abnormality. Tl-201-gated myocardial hybrid SPECT/CT can be a reliable tool in the assessment of LVEF in clinic.
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Affiliation(s)
- Ji Young Kim
- 1Department of Nuclear Medicine, College of Medicine, Hanyang University Guri Hospital, Guri, Republic of Korea
| | - Hwan-Cheol Park
- 2Department of Internal Medicine, College of Medicine, Hanyang University Guri Hospital, Guri, Republic of Korea
| | - Soo Jeong Kim
- 3Department of Nuclear Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, 29 Saemunan-ro, Jongno-gu, Seoul, 03181 Republic of Korea
| | - Hyung Seok Chang
- 3Department of Nuclear Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, 29 Saemunan-ro, Jongno-gu, Seoul, 03181 Republic of Korea
| | - Hyung Jin Choi
- 4Department of Nuclear Medicine, Hanyang University Seoul Hospital, Seoul, Republic of Korea
| | - Young Hwan Kim
- 3Department of Nuclear Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, 29 Saemunan-ro, Jongno-gu, Seoul, 03181 Republic of Korea
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Abstract
Cardiac SPECT continues to play a critical role in detecting and managing cardiovascular disease, in particularly coronary artery disease (CAD) (Jaarsma et al 2012 J. Am. Coll. Cardiol. 59 1719-28), (Agostini et al 2016 Eur. J. Nucl. Med. Mol. Imaging 43 2423-32). While conventional dual-head SPECT scanners using parallel-hole collimators and scintillation crystals with photomultiplier tubes are still the workhorse of cardiac SPECT, they have the limitations of low photon sensitivity (~130 count s-1 MBq-1), poor image resolution (~15 mm) (Imbert et al 2012 J. Nucl. Med. 53 1897-903), relatively long acquisition time, inefficient use of the detector, high radiation dose, etc. Recently our field observed an exciting growth of new developments of dedicated cardiac scanners and collimators, as well as novel imaging algorithms for quantitative cardiac SPECT. These developments have opened doors to new applications with potential clinical impact, including ultra-low-dose imaging, absolute quantification of myocardial blood flow (MBF) and coronary flow reserve (CFR), multi-radionuclide imaging, and improved image quality as a result of attenuation, scatter, motion, and partial volume corrections (PVCs). In this article, we review the recent advances in cardiac SPECT instrumentation and imaging methods. This review mainly focuses on the most recent developments published since 2012 and points to the future of cardiac SPECT from an imaging physics perspective.
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Affiliation(s)
- Jing Wu
- Department of Radiology and Biomedical Imaging, Yale University, New Haven, United States of America
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Dietze MMA, van der Velden S, Lam MGEH, Viergever MA, de Jong HWAM. Fast quantitative reconstruction with focusing collimators for liver SPECT. EJNMMI Phys 2018; 5:28. [PMID: 30511121 PMCID: PMC6277405 DOI: 10.1186/s40658-018-0228-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Accepted: 08/09/2018] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Generation of a SPECT scan during procedure may aid in the optimization of treatments as liver radioembolization by offering image-guided dosimetry. This, however, requires both shortened acquisition times and fast quantitative reconstruction. Focusing collimators increase sensitivity and thus may speed up imaging. Monte Carlo-based iterative reconstruction has shown to provide quantitative results for parallel hole collimators but may be slow. The purpose of this work is to develop fast Monte Carlo-based reconstruction for focusing collimators and to evaluate the impact of reconstruction and collimator choice on quantitative accuracy of liver dosimetry by means of simulations. RESULTS The developed fast Monte Carlo simulator was found to accurately generate projections compared to a full Monte Carlo simulation, providing projections in several seconds instead of several days. Monte Carlo-based scatter correction was superior to other scatter correction methods in describing recovered activity and reached similar noise levels as dual-energy window scatter correction. Although truncation artifacts were present in the cone beam collimator (50 cm), the region inside the field of view (FOV) could be reconstructed without loss of accuracy. Provided the object to image is inside the FOV, the focusing collimator with 50 cm focal distance could retrieve the same noise levels as a parallel hole collimator in 68% of the total scanning time, the multifocal collimator in 73% of the time, and the 100-cm focal distance collimator in 84% of the time. CONCLUSION Focusing collimators combined with Monte Carlo-based reconstruction have the ability to enable quantitative imaging of the FOV in a significantly shorter timeframe. The proposed approach to the forward projector will additionally make it possible to reconstruct within minutes. These are crucial steps in moving toward real-time dosimetry during interventions.
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Affiliation(s)
- Martijn M. A. Dietze
- Radiology and Nuclear Medicine, University Medical Center Utrecht, Utrecht University, P.O. Box 85500, 3508 Utrecht, GA Netherlands
- Image Sciences Institute, University Medical Center Utrecht, Utrecht University, P.O. Box 85500, 3508 Utrecht, GA Netherlands
| | - Sandra van der Velden
- Radiology and Nuclear Medicine, University Medical Center Utrecht, Utrecht University, P.O. Box 85500, 3508 Utrecht, GA Netherlands
- Image Sciences Institute, University Medical Center Utrecht, Utrecht University, P.O. Box 85500, 3508 Utrecht, GA Netherlands
| | - Marnix G. E. H. Lam
- Radiology and Nuclear Medicine, University Medical Center Utrecht, Utrecht University, P.O. Box 85500, 3508 Utrecht, GA Netherlands
| | - Max A. Viergever
- Image Sciences Institute, University Medical Center Utrecht, Utrecht University, P.O. Box 85500, 3508 Utrecht, GA Netherlands
| | - Hugo W. A. M. de Jong
- Radiology and Nuclear Medicine, University Medical Center Utrecht, Utrecht University, P.O. Box 85500, 3508 Utrecht, GA Netherlands
- Image Sciences Institute, University Medical Center Utrecht, Utrecht University, P.O. Box 85500, 3508 Utrecht, GA Netherlands
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Costa PF, Testanera G, Camoni L, Terwinghe C, Bailey EA, Bolus NE, Alden TM. Technologist Approach to Global Dose Optimization. J Nucl Med Technol 2018; 47:75-82. [PMID: 30413598 DOI: 10.2967/jnmt.118.218131] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Accepted: 09/25/2018] [Indexed: 01/15/2023] Open
Abstract
Nuclear medicine technologists are specialized health professionals who cover a wide range of tasks from clinical routine (including image acquisition and processing, radiopharmaceutical dispensing and administration, patient care, and radioprotection tasks) to leading clinical research in the field of nuclear medicine. As a fundamental concern in all radiation sciences applied to medicine, protection of individuals against the harmful effects of ionizing radiation must be constantly revised and applied by the professionals involved in medical exposures. The acknowledgment that nuclear medicine technologists play a prominent role in patient management and several procedural steps, both in diagnostic and in therapeutic nuclear medicine applications, carries the duty to be trained and knowledgeable on the topic of radiation protection and dose optimization. An overview on selected topics related to dose optimization is presented in this article, reflecting the similarities and particularities of dose reduction-related principles, initiatives, and practicalities from a global perspective.
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Affiliation(s)
- Pedro Fragoso Costa
- Department of Nuclear Medicine, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Giorgio Testanera
- Barts Health NHS Trust, Department of Nuclear Medicine, St. Bartholomew's Hospital, London, United Kingdom
| | - Luca Camoni
- Nuclear Medicine Unit, Department of Nuclear Medicine, Spedali Civili of Brescia, Brescia, Italy
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23
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Characteristics of iodine-123 IQ-SPECT/CT imaging compared with conventional SPECT/CT. Ann Nucl Med 2018; 33:103-111. [PMID: 30324427 DOI: 10.1007/s12149-018-1310-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Accepted: 10/08/2018] [Indexed: 12/31/2022]
Abstract
OBJECTIVES Although the utility of IQ-SPECT imaging using 99mTc and 201Tl myocardial perfusion SPECT has been reported, 123I-labeled myocardial SPECT has not been fully evaluated. We determined the characteristics and utility of 123I IQ-SPECT imaging compared with conventional SPECT (C-SPECT). METHODS Two myocardial phantom patterns were used to simulate normal myocardium and myocardial infarction. SPECT acquisition was performed using a hybrid dual-head SPECT/CT system equipped with a SMARTZOOM collimator for IQ-SPECT or a low-medium energy general purpose collimator for C-SPECT. Projection data were reconstructed using ordered subset expectation maximization with depth-dependent 3-dimensional resolution recovery for C-SPECT and ordered subset conjugate gradient minimizer method for IQ-SPECT. Three types of myocardial image were created; namely, no correction (NC), with attenuation correction (AC), and with both attenuation and scatter corrections (ACSC). Five observers visually scored the homogeneity of normal myocardium and defect severity of the myocardium with inferior defects by a five-point scale: homogeneity scores (5 = homogeneous to 1 = inhomogeneous) and defect scores (5 = excellent to 1 = poor). We also created a 17-segment polar map and quantitatively assessed segmental %uptake using a myocardial phantom with normal findings and defects. RESULTS The average visual homogeneity scores of the IQ-SPECT with NC and ACSC were significantly higher than that of C-SPECT, whereas the average visual defect scores of IQ-SPECT with AC and ACSC were significantly lower. The %uptake of all segments for IQ-SPECT with NC was significantly higher than that of C-SPECT. Furthermore, the subtraction of %uptake for C-SPECT and IQ-SPECT was the largest in inferior wall, which was approximately 10.1%, 14.7% and 14.4% for NC, AC and ACSC, respectively. The median % uptake values of the inferior wall with defect areas for C-SPECT and IQ-SPECT were 46.9% and 50.7% with NC, 59.8% and 69.2% with AC, and 54.7% and 66.5% with ACSC, respectively. CONCLUSION 123I IQ-SPECT imaging significantly improved the attenuation artifact compared with C-SPECT imaging. Although the defect detectability of IQ-SPECT was inferior to that of C-SPECT, 123I IQ-SPECT images with NC and ACSC met the criteria for defect detectability. Use of 123I IQ-SPECT is suitable for routine examinations.
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Abbott BG, Case JA, Dorbala S, Einstein AJ, Galt JR, Pagnanelli R, Bullock-Palmer RP, Soman P, Wells RG. Contemporary Cardiac SPECT Imaging-Innovations and Best Practices: An Information Statement from the American Society of Nuclear Cardiology. J Nucl Cardiol 2018; 25:1847-1860. [PMID: 30143954 DOI: 10.1007/s12350-018-1348-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
This information statement from the American Society of Nuclear Cardiology highlights advances in cardiac SPECT imaging and supports the incorporation of new technology and techniques in laboratories performing nuclear cardiology procedures. The document focuses on the application of the latest imaging protocols and the utilization of newer hardware and software options to perform high quality, state-of-the-art SPECT nuclear cardiology procedures. Recommendations for best practices of cardiac SPECT imaging are discussed, highlighting what imaging laboratories should be doing as the standard of care in 2018 to achieve optimal results (based on the ASNC 2018 SPECT guideline [Dorbala et al., J Nucl Cardiol. 2018. https://doi.org/10.1007/s12350-018-1283-y ]).
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Affiliation(s)
- Brian G Abbott
- Warren Alpert Medical School, Brown University, Providence, RI, USA.
| | - James A Case
- Cardiovascular Imaging Technologies, Kansas City, MO, USA
| | - Sharmila Dorbala
- Harvard Medical School, Brigham and Women's Hospital, Boston, MA, USA
| | - Andrew J Einstein
- Columbia University Irving Medical Center and New York-Presbyterian Hospital, New York, NY, USA
| | - James R Galt
- Emory University School of Medicine, Atlanta, GA, USA
| | | | | | - Prem Soman
- Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - R Glenn Wells
- University of Ottawa Heart Institute, Ottawa, Canada
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25
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Okuda K, Nakajima K, Matsuo S, Kondo C, Sarai M, Horiguchi Y, Konishi T, Onoguchi M, Shimizu T, Kinuya S. Creation and characterization of normal myocardial perfusion imaging databases using the IQ·SPECT system. J Nucl Cardiol 2018; 25:1328-1337. [PMID: 28050865 DOI: 10.1007/s12350-016-0770-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Accepted: 12/10/2016] [Indexed: 12/01/2022]
Abstract
BACKGROUND Image acquisition by short-time single-photon emission-computed tomography (SPECT) has been made feasible by IQ·SPECT. The aim of this study was to generate normal databases (NDBs) of thallium-201 (201Tl) myocardial perfusion imaging for IQ·SPECT, and characterize myocardial perfusion distribution. METHODS AND RESULTS We retrospectively enrolled 159 patients with a low likelihood of cardiac diseases from four hospitals in Japan. All patients underwent short-time 201Tl myocardial perfusion IQ·SPECT with or without attenuation and scatter correction (ACSC) in either supine or prone position. The mean myocardial counts were calculated using 17-segment polar maps. Three NDBs were derived from supine and prone images as well as supine images with ACSC. Differences between the supine and prone positions were observed in the uncorrected sex-segregated NDBs in the mid-inferolateral counts (p ≤ 0.016 for males and p ≤ 0.002 for females). Differences between IQ·SPECT and conventional SPECT were also observed in the mid-anterior, inferolateral, and apical lateral counts (p ≤ 0.009 for males and p ≤ 0.003 for females). Apical low counts attributed to myocardial thinning were observed in the apical anterior and apex segments in the supine IQ·SPECT NDB with ACSC. CONCLUSIONS There were significant differences between uncorrected supine and prone NDBs, between uncorrected supine NDB and supine NDB with ACSC, and between uncorrected supine NDB and conventional SPECT NDB. Understanding the pattern of normal distribution in IQ-SPECT short-time acquisitions with and without ACSC will be helpful for interpretation of imaging findings in patients with coronary artery disease (CAD) or low likelihood of CAD and the NDBs will aid in quantitative analysis.
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Affiliation(s)
- Koichi Okuda
- Department of Physics, Kanazawa Medical University, 1-1 Daigaku, Uchinada, Kahoku, Ishikawa, 920-0293, Japan.
| | - Kenichi Nakajima
- Department of Nuclear Medicine, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8641, Japan.
| | - Shinro Matsuo
- Department of Nuclear Medicine, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8641, Japan
| | - Chisato Kondo
- Department of Diagnostic Imaging and Nuclear Medicine, Tokyo Women's Medical University Hospital, Tokyo, Japan
| | - Masayoshi Sarai
- Department of Cardiology, Fujita Health University Hospital, Aichi, Japan
| | - Yoriko Horiguchi
- Department of Cardiology, National Hospital Organization Sagamihara National Hospital, Kanagawa, Japan
| | - Takahiro Konishi
- Department of Radiology, Kanazawa University Hospital, Kanazawa, Japan
| | - Masahisa Onoguchi
- Department of Quantum Medical Technology, Kanazawa University, Kanazawa, Japan
| | - Takeshi Shimizu
- Department of Molecular Imaging, Siemens Healthcare K.K., Tokyo, Japan
| | - Seigo Kinuya
- Department of Nuclear Medicine, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8641, Japan
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26
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Galt JR. New techniques, distinctive population, unique normal databases. J Nucl Cardiol 2018; 25:1338-1341. [PMID: 28474193 DOI: 10.1007/s12350-017-0876-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Accepted: 03/27/2017] [Indexed: 10/19/2022]
Affiliation(s)
- James R Galt
- Department of Radiology and Imaging Sciences, Emory University School of Medicine, 1364 Clifton Road, Atlanta, Georgia, 30322, USA.
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27
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Tanaka H, Takahashi T, Ohashi N, Tanaka K, Okada T, Kihara Y. Diagnostic value of thallium-201 myocardial perfusion IQ-SPECT without and with computed tomography-based attenuation correction to predict clinically significant and insignificant fractional flow reserve: A single-center prospective study. Medicine (Baltimore) 2017; 96:e9275. [PMID: 29390486 PMCID: PMC5758188 DOI: 10.1097/md.0000000000009275] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
The aim of this study was to clarify the predictive value of fractional flow reserve (FFR) determined by myocardial perfusion imaging (MPI) using thallium (Tl)-201 IQ-SPECT without and with computed tomography-based attenuation correction (CT-AC) for patients with stable coronary artery disease (CAD).We assessed 212 angiographically identified diseased vessels using adenosine-stress Tl-201 MPI-IQ-SPECT/CT in 84 consecutive, prospectively identified patients with stable CAD. We compared the FFR in 136 of the 212 diseased vessels using visual semiquantitative interpretations of corresponding territories on MPI-IQ-SPECT images without and with CT-AC.FFR inversely correlated most accurately with regional summed difference scores (rSDS) in images without and with CT-AC (r = -0.584 and r = -0.568, respectively, both P < .001). Receiver-operating characteristics analyses using rSDS revealed an optimal FFR cut-off of <0.80 without and with CT-AC. Although the diagnostic accuracy of FFR <0.80 did not significantly differ, FFR ≥0.82 was significantly more accurate with, than without CT-AC. Regions with rSDS ≥2 without or with CT-AC predicted FFR <0.80, and those with rSDS ≤1 without and with CT-AC predicted FFR ≥0.81, with 73% and 83% sensitivity, 84% and 67% specificity, and 79% and 75% accuracy, respectively.Although limited by the sample size and the single-center design, these findings showed that the IQ-SPECT system can predict FFR at an optimal cut-off of <0.80, and we propose a novel application of CT-AC to MPI-IQ-SPECT for predicting clinically significant and insignificant FFR even in nonobese patients.
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Affiliation(s)
- Haruki Tanaka
- Department of Cardiology, Miyoshi Central Hospital, Miyoshi City, Hiroshima, Japan
| | | | - Norihiko Ohashi
- Department of Cardiology, Hiroshima Red Cross Hospital and Atomic-bomb Survivors Hospital
| | - Koichi Tanaka
- Department of Cardiology, Miyoshi Central Hospital, Miyoshi City, Hiroshima, Japan
| | - Takenori Okada
- Department of Cardiology, Hiroshima Red Cross Hospital and Atomic-bomb Survivors Hospital
| | - Yasuki Kihara
- Department of Cardiovascular Medicine, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima City, Japan
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Massardo T, Alarcón L, Spuler J. Estratificación de riesgo de enfermedad coronaria con métodos isotópicos. Estado actual de la práctica clínica. Rev Esp Med Nucl Imagen Mol 2017; 36:377-387. [DOI: 10.1016/j.remn.2017.06.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Revised: 06/07/2017] [Accepted: 06/14/2017] [Indexed: 11/28/2022]
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Massardo T, Alarcón L, Spuler J. Risk stratification of coronary artery disease using radionuclides. Current status of clinical practice. Rev Esp Med Nucl Imagen Mol 2017. [DOI: 10.1016/j.remnie.2017.09.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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30
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Zoccarato O, Marcassa C, Lizio D, Leva L, Lucignani G, Savi A, Scabbio C, Matheoud R, Lecchi M, Brambilla M. Differences in polar-map patterns using the novel technologies for myocardial perfusion imaging. J Nucl Cardiol 2017; 24:1626-1636. [PMID: 27233252 DOI: 10.1007/s12350-016-0500-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Accepted: 04/01/2016] [Indexed: 10/21/2022]
Abstract
BACKGROUND New technologies are available in MPI. Our aim was to evaluate their impact on the uniformity of normal myocardial uptake in the polar-map representation, over different count statistics, with and without the attenuation (AC) and scatter corrections (SC). METHODS A phantom study was performed using 5 Anger gamma cameras with filtered back projection or iterative reconstruction with resolution recovery (IRR), with or without SCAC; a D530c, with or without AC; and a D-SPECT. Count statistics ranged up to a quarter of the reference for the conventional gamma cameras and up to one half for the advanced scanners. Using polar maps, the segmental uptakes and their uncertainties, the 'global uniformity' of polar maps expressed as the coefficient of variation (COV) among the segmental uptakes and the anterior/inferior (ANT/INF) ratio were calculated. RESULTS Both segmental uptakes and their uncertainties did not depend on the count statistics in the range studied. An increase in the segmental uptakes was found from IRR to IRR + SCAC (78.0% ± 13.5% vs 86.1% ± 9.4%; P < .0001). COV was lower for D-SPECT (10.1% ± 0.5%) and after SCAC for both conventional (9.9% ± 3.0%) and advanced systems (8.9% ± 1.7%). The ANT/INF ratio was above 1 for IRR (1.12 ± 0.07) and fell slightly below 1 for IRR + SCAC (0.97 ± 0.05). CONCLUSIONS To compare data from the analysis of polar maps across different systems will require the adoption of specific normality databases, developed for each system and reconstruction method employed.
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Affiliation(s)
- Orazio Zoccarato
- Unit of Nuclear Medicine and Department of Cardiology, S. Maugeri Foundation, IRCCS, Scientific Institute of Veruno, Veruno, NO, Italy
| | - Claudio Marcassa
- Unit of Nuclear Medicine and Department of Cardiology, S. Maugeri Foundation, IRCCS, Scientific Institute of Veruno, Veruno, NO, Italy
| | - Domenico Lizio
- Departments of Medical Physics and Nuclear Medicine, University Hospital 'Maggiore della Carità', Novara, Italy
| | - Lucia Leva
- Departments of Medical Physics and Nuclear Medicine, University Hospital 'Maggiore della Carità', Novara, Italy
| | - Giovanni Lucignani
- Department of Health Sciences, University of Milan and Nuclear Medicine Unit, ASST Santi Paolo e Carlo, Milan, Italy
| | - Annarita Savi
- Nuclear Medicine Department, IRCCS San Raffaele Hospital, Milan, Italy
| | - Camilla Scabbio
- Department of Health Sciences, University of Milan and Nuclear Medicine Unit, ASST Santi Paolo e Carlo, Milan, Italy
| | - Roberta Matheoud
- Departments of Medical Physics and Nuclear Medicine, University Hospital 'Maggiore della Carità', Novara, Italy
| | - Michela Lecchi
- Department of Health Sciences, University of Milan and Nuclear Medicine Unit, ASST Santi Paolo e Carlo, Milan, Italy
| | - Marco Brambilla
- Departments of Medical Physics and Nuclear Medicine, University Hospital 'Maggiore della Carità', Novara, Italy.
- Medical Physics Department, University Hospital of Novara, Novara, Italy.
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Brambilla M, Lecchi M, Matheoud R, Leva L, Lucignani G, Marcassa C, Zoccarato O. Comparative analysis of iterative reconstruction algorithms with resolution recovery and new solid state cameras dedicated to myocardial perfusion imaging. Phys Med 2017; 41:109-116. [DOI: 10.1016/j.ejmp.2017.03.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Revised: 02/27/2017] [Accepted: 03/17/2017] [Indexed: 11/28/2022] Open
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Ejection fraction in myocardial perfusion imaging assessed with a dynamic phantom: comparison between IQ-SPECT and LEHR. EJNMMI Phys 2017; 4:20. [PMID: 28726076 PMCID: PMC5517386 DOI: 10.1186/s40658-017-0187-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Accepted: 06/27/2017] [Indexed: 11/24/2022] Open
Abstract
Background Developments in single photon emission tomography instrumentation and reconstruction methods present a potential for decreasing acquisition times. One of such recent options for myocardial perfusion imaging (MPI) is IQ-SPECT. This study was motivated by the inconsistency in the reported ejection fraction (EF) and left ventricular (LV) volume results between IQ-SPECT and more conventional low-energy high-resolution (LEHR) collimation protocols. IQ-SPECT and LEHR quantitative results were compared while the equivalent number of iterations (EI) was varied. The end-diastolic (EDV) and end-systolic volumes (ESV) and the derived EF values were investigated. A dynamic heart phantom was used to produce repeatable ESVs, EDVs and EFs. Phantom performance was verified by comparing the set EF values to those measured from a gated multi-slice X-ray computed tomography (CT) scan (EFTrue). The phantom with an EF setting of 45, 55, 65 and 70% was imaged with both IQ-SPECT and LEHR protocols. The data were reconstructed with different EI, and two commonly used clinical myocardium delineation software were used to evaluate the LV volumes. Results The CT verification showed that the phantom EF settings were repeatable and accurate with the EFTrue being within 1% point from the manufacture’s nominal value. Depending on EI both MPI protocols can be made to produce correct EF estimates, but IQ-SPECT protocol produced on average 41 and 42% smaller EDV and ESV when compared to the phantom’s volumes, while LEHR protocol underestimated volumes by 24 and 21%, respectively. The volume results were largely similar between the delineation methods used. Conclusions The reconstruction parameters can greatly affect the volume estimates obtained from perfusion studies. IQ-SPECT produces systematically smaller LV volumes than the conventional LEHR MPI protocol. The volume estimates are also software dependent.
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Yoneyama H, Shibutani T, Konishi T, Mizutani A, Hashimoto R, Onoguchi M, Okuda K, Matsuo S, Nakajima K, Kinuya S. Validation of Left Ventricular Ejection Fraction with the IQ•SPECT System in Small-Heart Patients. J Nucl Med Technol 2017; 45:201-207. [DOI: 10.2967/jnmt.116.188680] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Accepted: 05/09/2017] [Indexed: 11/16/2022] Open
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Lecchi M, Martinelli I, Zoccarato O, Maioli C, Lucignani G, Del Sole A. Comparative analysis of full-time, half-time, and quarter-time myocardial ECG-gated SPECT quantification in normal-weight and overweight patients. J Nucl Cardiol 2017; 24:876-887. [PMID: 26911365 DOI: 10.1007/s12350-015-0382-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Revised: 12/10/2015] [Indexed: 10/22/2022]
Abstract
BACKGROUND The introduction of a camera-based dose-reduction strategy in myocardial perfusion imaging (MPI) clinical setting entails the definition of objective and reproducible criteria for establishing the amount of activity to be injected. AIM The aim is to evaluate the impact of count statistics on the estimation of summed-scores (SS), end-diastolic volume (EDV), end-systolic volume (ESV), and ejection fraction (EF). METHODS Data rest/stress ECG-gated SPECT (2-day protocol and 8 MBq·kg-1) were acquired with Bright View gamma camera and Astonish algorithm for 40 normal-weight and 40 overweight patients. Assuming that count statistics of shorter acquisition time may simulate that of lower injected activity, three simultaneous scans (full-time, half-time, and quarter-time scans) were started at the same time but with different acquisition time/projection (30, 15 and 8 seconds). RESULTS A significant difference between SS values of half-time and quarter-time stress scans was found for overweight group (P = .006). Post hoc test showed significant differences for ESV (P < .05), EDV (P < .01) and EF (P < .05) between half-time and quarter-time scans for both patient groups. CONCLUSIONS The reduction of the count-statistics to a quarter of the MPI reference influenced negatively the quantification in overweight patients. The decrease of radiopharmaceutical activity to 25% of the reference seems practicable for normal-weight patients, while it is more appropriate an activity reduction limited to 50% for overweight and obese patients.
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Affiliation(s)
- M Lecchi
- Nuclear Medicine Unit, Department of Health Sciences, University of Milan, San Paolo Hospital, Via Antonio di Rudini, 8, 20142, Milan, Italy
| | - I Martinelli
- Nuclear Medicine Unit, Department of Health Sciences, University of Milan, San Paolo Hospital, Via Antonio di Rudini, 8, 20142, Milan, Italy
| | - O Zoccarato
- Unit of Nuclear Medicine, S. Maugeri Foundation, IRCCS, Scientific Institute of Veruno, Veruno, NO, Italy
| | - C Maioli
- Nuclear Medicine Unit, Department of Health Sciences, University of Milan, San Paolo Hospital, Via Antonio di Rudini, 8, 20142, Milan, Italy
| | - Giovanni Lucignani
- Nuclear Medicine Unit, Department of Health Sciences, University of Milan, San Paolo Hospital, Via Antonio di Rudini, 8, 20142, Milan, Italy.
| | - A Del Sole
- Nuclear Medicine Unit, Department of Health Sciences, University of Milan, San Paolo Hospital, Via Antonio di Rudini, 8, 20142, Milan, Italy
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Shibutani T, Onoguchi M, Yoneyama H, Konishi T, Matsuo S, Nakajima K, Kinuya S. Characteristics of single- and dual-photopeak energy window acquisitions with thallium-201 IQ-SPECT/CT system. Ann Nucl Med 2017; 31:529-535. [PMID: 28470630 DOI: 10.1007/s12149-017-1177-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Accepted: 04/25/2017] [Indexed: 10/19/2022]
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36
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Konishi T, Nakajima K, Okuda K, Yoneyama H, Matsuo S, Shibutani T, Onoguchi M, Kinuya S. IQ-SPECT for thallium-201 myocardial perfusion imaging: effect of normal databases on quantification. Ann Nucl Med 2017; 31:454-461. [PMID: 28405882 DOI: 10.1007/s12149-017-1170-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2016] [Accepted: 04/03/2017] [Indexed: 11/24/2022]
Abstract
OBJECTIVE Although IQ-single-photon emission computed tomography (SPECT) provides rapid acquisition and attenuation-corrected images, the unique technology may create characteristic distribution different from the conventional imaging. This study aimed to compare the diagnostic performance of IQ-SPECT using Japanese normal databases (NDBs) with that of the conventional SPECT for thallium-201 (201Tl) myocardial perfusion imaging (MPI). METHODS A total of 36 patients underwent 1-day 201Tl adenosine stress-rest MPI. Images were acquired with IQ-SPECT at approximately one-quarter of the standard time of conventional SPECT. Projection data acquired with the IQ-SPECT system were reconstructed via an ordered subset conjugate gradient minimizer method with or without scatter and attenuation correction (SCAC). Projection data obtained using the conventional SPECT were reconstructed via a filtered back projection method without SCAC. The summed stress score (SSS) was calculated using NDBs created by the Japanese Society of Nuclear Medicine working group, and scores were compared between IQ-SPECT and conventional SPECT using the acquisition condition-matched NDBs. The diagnostic performance of the methods for the detection of coronary artery disease was also compared. RESULTS SSSs were 6.6 ± 8.2 for the conventional SPECT, 6.6 ± 9.4 for IQ-SPECT without SCAC, and 6.5 ± 9.7 for IQ-SPECT with SCAC (p = n.s. for each comparison). The SSS showed a strong positive correlation between conventional SPECT and IQ-SPECT (r = 0.921 and p < 0.0001), and the correlation between IQ-SPECT with and without SCAC was also good (r = 0.907 and p < 0.0001). Regarding diagnostic performance, the sensitivity, specificity, and accuracy were 80.8, 78.9, and 79.4%, respectively, for the conventional SPECT; 80.8, 80.3, and 82.0%, respectively, for IQ-SPECT without SCAC; and 88.5, 86.8, and 87.3%, respectively, for IQ-SPECT with SCAC, respectively. The area under the curve obtained via receiver operating characteristic analysis were 0.77, 0.80, and 0.86 for conventional SPECT, IQ-SPECT without SCAC, and IQ-SPECT with SCAC, respectively (p = n.s. for each comparison). CONCLUSIONS When appropriate NDBs were used, the diagnostic performance of 201Tl IQ-SPECT was comparable with that of the conventional system regardless of different characteristics of myocardial accumulation in the conventional system.
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Affiliation(s)
- Takahiro Konishi
- Department of Radiology, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, 920-8641, Japan
| | - Kenichi Nakajima
- Department of Nuclear Medicine, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, 920-8641, Japan.
| | - Koichi Okuda
- Department of Physics, Kanazawa Medical University, 1-1 Daigaku, Uchinada, Kahoku, Ishikawa, 920-0293, Japan
| | - Hiroto Yoneyama
- Department of Radiology, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, 920-8641, Japan
| | - Shinro Matsuo
- Department of Nuclear Medicine, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, 920-8641, Japan
| | - Takayuki Shibutani
- Department of Quantum Medical Technology, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 5-11-80 Kodatsuno, Kanazawa, Ishikawa, 920-0942, Japan
| | - Masahisa Onoguchi
- Department of Quantum Medical Technology, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 5-11-80 Kodatsuno, Kanazawa, Ishikawa, 920-0942, Japan
| | - Seigo Kinuya
- Department of Nuclear Medicine, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, 920-8641, Japan
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Qualitative and quantitative comparison of gated blood pool single photon emission computed tomography using low-energy high-resolution and SMARTZOOM collimation. Nucl Med Commun 2017; 38:35-43. [DOI: 10.1097/mnm.0000000000000609] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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38
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Takahashi K, Takeuchi T, Hosokai Y, Odagiri H, Saito H. [Motion-frozen Imaging by Gated Myocardial Perfusion Single Photon Emission Computed Tomography Using Multi-focus Fan Beam Collimator in Thallium-201 Study]. Nihon Hoshasen Gijutsu Gakkai Zasshi 2017; 73:282-290. [PMID: 28428471 DOI: 10.6009/jjrt.2017_jsrt_73.4.282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
PURPOSE This study aimed to evaluate the statistical noise of motion-frozen (MF) image generated by gated myocardial perfusion single photon emission computed tomography (SPECT) imaging using IQ · SPECT and to determine the optimal acquisition and reconstruction parameters for MF image using IQ · SPECT. METHODS A movement cardiac phantom and static cardiac phantom were used to acquire the MF images. The acquisition times used were different in 8 and 16 frames per R-R interval, and varying reconstruction parameters (subset and iteration) were used. We determined the %CV value, contrast, and normalized mean square error (NMSE) to evaluate the image quality. RESULTS The %CV value for a MF image with IQ · SPECT was lower than that for a conventional non-gated myocardial perfusion SPECT (MPS) image with low energy high resolution (LEHR). With regard to the acquisition parameters, the contrast did not change when the acquisition time was increased in 8 and 16 frames per R-R interval. NMSE converged in 56 beats/view in 8 frames per R-R interval. With regard to the reconstruction parameters, the contrast and the %CV value of the anterior and septal wall converged in update 40. The minimum NMSE in subsets 1, 2, and 3 were almost similar. CONCLUSIONS Uniformity in the MF image with IQ · SPECT was higher than that in the conventional image. The results of this MF image with IQ · SPECT study suggest that the optimal acquisition parameter should be 56 beats/view in 8 frames per R-R interval, and the optimal reconstruction parameters should be subset 3 and iteration 14.
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Affiliation(s)
- Kaito Takahashi
- Department of Diagnostic Image Analysis, Graduate School of Medicine, Tohoku University
| | | | - Yoshiyuki Hosokai
- Department of Radiological Sciences, School of Health Sciences, International University of Health and Welfare
| | - Hayato Odagiri
- Department of Diagnostic Radiology, Tohoku University Hospital
| | - Haruo Saito
- Department of Diagnostic Image Analysis, Graduate School of Medicine, Tohoku University
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Gremillet E, Agostini D. How to use cardiac IQ•SPECT routinely? An overview of tips and tricks from practical experience to the literature. Eur J Nucl Med Mol Imaging 2016; 43:707-10. [PMID: 26669308 DOI: 10.1007/s00259-015-3269-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Eric Gremillet
- Centre d'Imagerie Nucléaire, Hôpital Privé de la Loire, Saint-Etienne, France.
| | - Denis Agostini
- Department of Nuclear Medicine, University Hospital of Caen and Normandie Université, EA4650, Caen, France.
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Myocardial perfusion scintigraphy dosimetry: optimal use of SPECT and SPECT/CT technologies in stress-first imaging protocol. Clin Transl Imaging 2016; 4:491-498. [PMID: 27933282 PMCID: PMC5118398 DOI: 10.1007/s40336-016-0212-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Accepted: 10/20/2016] [Indexed: 01/11/2023]
Abstract
Purpose Over the past decade, nuclear medicine experts have been seeking to minimize patient exposure to radiation in myocardial perfusion scintigraphy (MPS). This review describes the latest technological innovations in MPS, particularly with regard to dose reduction. Methods We searched in PubMed for original clinical papers in English, published after 2008, using the following research criteria: (dose) and ((reduction) or (reducing)) and ((myocardial) or (cardiac) or (heart)) and ((nuclear medicine) or (nuclear imaging) or (radionuclide) or (scintigraphy) or (SPET) or (SPECT)). Thereafter, recent reviews on the topic were considered and other relevant clinical papers were added to the results. Results Of 202 non-duplicate articles, 17 were included. To these, another eight papers cited in recent reviews were added. By optimizing the features of software, i.e., through algorithms for iterative reconstruction with resolution recovery (IRRs), and hardware, i.e., scanners and collimators, and by preferring, unless otherwise indicated, the use of stress-first imaging protocols, it has become possible to reduce the effective dose by at least 50% in stress/rest protocols, and by up to 89% in patients undergoing a diagnostic stress-only study with new technology. With today’s SPECT/CT systems, the use of a stress-first protocol can conveniently be performed, resulting in an overall dose reduction of about 35% if two-thirds of stress-first examinations were considered definitively normal. Conclusion Using innovative gamma cameras, collimators and software, as well as, unless otherwise indicated, stress-first imaging protocols, it has become possible to reduce significantly the effective dose in a high percentage of patients, even when X-ray CT scanning is performed for attenuation correction.
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Lyon MC, Foster C, Ding X, Dorbala S, Spence D, Bhattacharya M, Vija AH, DiCarli MF, Moore SC. Dose reduction in half-time myocardial perfusion SPECT-CT with multifocal collimation. J Nucl Cardiol 2016; 23:657-67. [PMID: 27033352 DOI: 10.1007/s12350-016-0471-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Revised: 01/26/2016] [Indexed: 10/22/2022]
Abstract
BACKGROUND Recent technological advances in myocardial perfusion imaging may warrant the use of lower injected activity. We evaluated whether quantitative measures of stress myocardial perfusion defects using Tc-99m sestamibi and low-energy high-resolution (LEHR) collimators are equivalent to lower dose SPECT-CT with cardiac multifocal collimators and software (IQ·SPECT). METHODS 93 patients underwent one-day rest-stress gated SPECT-CT. Following conventional rest imaging, 925-1100 MBq (25-30 mCi) of Tc-99m sestamibi was injected during stress testing. Stress SPECT-CT images were acquired two ways: with LEHR (13 minutes) and IQ·SPECT (7 minutes). Low-dose IQ·SPECT stress was simulated by subsampling the full-dose data to half-, quarter-, and eighth-count levels. Abnormalities were quantified using the total perfusion deficit (TPD) score and dose-specific databases. RESULTS The mean ± SD of the differences between LEHR and IQ·SPECT TPD scores were -1.01 ± 5.36%, -0.10 ± 5.81%, 1.78 ± 4.81%, and 1.75 ± 6.05% at full, half, quarter, and eighth doses, respectively. Differences were statistically significant for quarter and eighth doses. Correlation between LEHR and IQ·SPECT was excellent at all doses (R ≥ 0.93). Bland-Altman plots demonstrated minimal bias. CONCLUSIONS With IQ·SPECT, quantitative stress SPECT-CT imaging is possible with half of the standard injected activity in half the time.
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Affiliation(s)
- Morgan C Lyon
- Division of Nuclear Medicine, Department of Radiology, Brigham and Women's Hospital, Boston, MA, USA.
- Department of Radiology, Harvard Medical School, Boston, MA, USA.
- inviCRO, 27 Drydock Ave, Boston, MA, 02210, USA.
| | - Courtney Foster
- Division of Nuclear Medicine, Department of Radiology, Brigham and Women's Hospital, Boston, MA, USA
| | - Xinhong Ding
- Molecular Imaging, Siemens Medical Solutions USA, Inc., Hoffman Estates, IL, USA
| | - Sharmila Dorbala
- Division of Nuclear Medicine, Department of Radiology, Brigham and Women's Hospital, Boston, MA, USA
- Department of Radiology, Harvard Medical School, Boston, MA, USA
| | - Don Spence
- Molecular Imaging, Siemens Medical Solutions USA, Inc., Hoffman Estates, IL, USA
| | | | - A Hans Vija
- Molecular Imaging, Siemens Medical Solutions USA, Inc., Hoffman Estates, IL, USA
| | - Marcelo F DiCarli
- Division of Nuclear Medicine, Department of Radiology, Brigham and Women's Hospital, Boston, MA, USA
- Department of Radiology, Harvard Medical School, Boston, MA, USA
| | - Stephen C Moore
- Division of Nuclear Medicine, Department of Radiology, Brigham and Women's Hospital, Boston, MA, USA
- Department of Radiology, Harvard Medical School, Boston, MA, USA
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Zoccarato O, Lizio D, Savi A, Indovina L, Scabbio C, Leva L, Del Sole A, Marcassa C, Matheoud R, Lecchi M, Brambilla M. Comparative analysis of cadmium-zincum-telluride cameras dedicated to myocardial perfusion SPECT: A phantom study. J Nucl Cardiol 2016; 23:885-93. [PMID: 26134885 DOI: 10.1007/s12350-015-0203-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Accepted: 06/02/2015] [Indexed: 11/24/2022]
Abstract
BACKGROUND This investigation used image data generated by an anthropomorphic phantom with a cardiac insert for a comparison between two solid state cameras: D-SPECT and D530c. METHODS For each camera, two sets (with and without a simulated transmural defect (TD)) of scans were acquired starting from the in vivo standard count statistics in the left ventricle (LV). Other two acquisitions corresponding to 150% and 50% of the reference count statistics were acquired. Five performance indices related to spatial resolution, contrast, and contrast-to-noise ratio (CNR) were analyzed. RESULTS D-SPECT showed a lower LV wall thickness and an inferior sharpness than D530c. No significant differences were found in terms of contrast between LV wall and the inner cavity, TD contrast or CNR. No significant differences were observed in CNR when moving from the reference level of count statistics down to 50% or up to 150% of the counts acquired on the LV. CONCLUSIONS Our results show that D-SPECT and D530c have different performances. The lack of differences in the image performance indices along the range of count statistics explored, indicates that there is the possibility for a further reduction in the injected activity and/or the acquisition time, for both systems.
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Affiliation(s)
- Orazio Zoccarato
- Unit of Nuclear Medicine and Department of Cardiology, S. Maugeri Foundation, IRCCS, Scientific Institute of Veruno, Veruno, NO, Italy
| | - Domenico Lizio
- Departments of Medical Physics and Nuclear Medicine, University Hospital 'Maggiore della Carità', Novara, Italy
| | - Annarita Savi
- Department of Nuclear Medicine, Hospital San Raffaele, Milan, Italy
| | - Luca Indovina
- Department of Medical Physics, Polyclinic Agostino Gemelli, Rome, Italy
| | - Camilla Scabbio
- Department of Health Sciences, University of Milan and Nuclear Medicine Unit, San Paolo Hospital, Milan, Italy
| | - Lucia Leva
- Departments of Medical Physics and Nuclear Medicine, University Hospital 'Maggiore della Carità', Novara, Italy
| | - Angelo Del Sole
- Department of Health Sciences, University of Milan and Nuclear Medicine Unit, San Paolo Hospital, Milan, Italy
| | - Claudio Marcassa
- Unit of Nuclear Medicine and Department of Cardiology, S. Maugeri Foundation, IRCCS, Scientific Institute of Veruno, Veruno, NO, Italy
| | - Roberta Matheoud
- Departments of Medical Physics and Nuclear Medicine, University Hospital 'Maggiore della Carità', Novara, Italy
| | - Michela Lecchi
- Department of Health Sciences, University of Milan and Nuclear Medicine Unit, San Paolo Hospital, Milan, Italy
| | - Marco Brambilla
- Departments of Medical Physics and Nuclear Medicine, University Hospital 'Maggiore della Carità', Novara, Italy.
- Medical Physics Department, University Hospital of Novara, Novara, Italy.
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Huang JY, Huang CK, Yen RF, Wu HY, Tu YK, Cheng MF, Lu CC, Tzen KY, Chien KL, Wu YW. Diagnostic Performance of Attenuation-Corrected Myocardial Perfusion Imaging for Coronary Artery Disease: A Systematic Review and Meta-Analysis. J Nucl Med 2016; 57:1893-1898. [DOI: 10.2967/jnumed.115.171462] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Accepted: 06/27/2016] [Indexed: 01/07/2023] Open
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Li S, Zhang J, Krol A, Schmidtlein CR, Vogelsang L, Shen L, Lipson E, Feiglin D, Xu Y. Effective noise-suppressed and artifact-reduced reconstruction of SPECT data using a preconditioned alternating projection algorithm. Med Phys 2016; 42:4872-87. [PMID: 26233214 DOI: 10.1118/1.4926846] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
PURPOSE The authors have recently developed a preconditioned alternating projection algorithm (PAPA) with total variation (TV) regularizer for solving the penalized-likelihood optimization model for single-photon emission computed tomography (SPECT) reconstruction. This algorithm belongs to a novel class of fixed-point proximity methods. The goal of this work is to investigate how PAPA performs while dealing with realistic noisy SPECT data, to compare its performance with more conventional methods, and to address issues with TV artifacts by proposing a novel form of the algorithm invoking high-order TV regularization, denoted as HOTV-PAPA, which has been explored and studied extensively in the present work. METHODS Using Monte Carlo methods, the authors simulate noisy SPECT data from two water cylinders; one contains lumpy "warm" background and "hot" lesions of various sizes with Gaussian activity distribution, and the other is a reference cylinder without hot lesions. The authors study the performance of HOTV-PAPA and compare it with PAPA using first-order TV regularization (TV-PAPA), the Panin-Zeng-Gullberg one-step-late method with TV regularization (TV-OSL), and an expectation-maximization algorithm with Gaussian postfilter (GPF-EM). The authors select penalty-weights (hyperparameters) by qualitatively balancing the trade-off between resolution and image noise separately for TV-PAPA and TV-OSL. However, the authors arrived at the same penalty-weight value for both of them. The authors set the first penalty-weight in HOTV-PAPA equal to the optimal penalty-weight found for TV-PAPA. The second penalty-weight needed for HOTV-PAPA is tuned by balancing resolution and the severity of staircase artifacts. The authors adjust the Gaussian postfilter to approximately match the local point spread function of GPF-EM and HOTV-PAPA. The authors examine hot lesion detectability, study local spatial resolution, analyze background noise properties, estimate mean square errors (MSEs), and report the convergence speed and computation time. RESULTS HOTV-PAPA yields the best signal-to-noise ratio, followed by TV-PAPA and TV-OSL/GPF-EM. The local spatial resolution of HOTV-PAPA is somewhat worse than that of TV-PAPA and TV-OSL. Images reconstructed using HOTV-PAPA have the lowest local noise power spectrum (LNPS) amplitudes, followed by TV-PAPA, TV-OSL, and GPF-EM. The LNPS peak of GPF-EM is shifted toward higher spatial frequencies than those for the three other methods. The PAPA-type methods exhibit much lower ensemble noise, ensemble voxel variance, and image roughness. HOTV-PAPA performs best in these categories. Whereas images reconstructed using both TV-PAPA and TV-OSL are degraded by severe staircase artifacts; HOTV-PAPA substantially reduces such artifacts. It also converges faster than the other three methods and exhibits the lowest overall reconstruction error level, as measured by MSE. CONCLUSIONS For high-noise simulated SPECT data, HOTV-PAPA outperforms TV-PAPA, GPF-EM, and TV-OSL in terms of hot lesion detectability, noise suppression, MSE, and computational efficiency. Unlike TV-PAPA and TV-OSL, HOTV-PAPA does not create sizable staircase artifacts. Moreover, HOTV-PAPA effectively suppresses noise, with only limited loss of local spatial resolution. Of the four methods, HOTV-PAPA shows the best lesion detectability, thanks to its superior noise suppression. HOTV-PAPA shows promise for clinically useful reconstructions of low-dose SPECT data.
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Affiliation(s)
- Si Li
- Guangdong Provincial Key Laboratory of Computational Science, School of Mathematics and Computational Sciences, Sun Yat-sen University, Guangzhou 510275, China
| | - Jiahan Zhang
- Department of Physics, Syracuse University, Syracuse, New York 13244
| | - Andrzej Krol
- Department of Radiology, SUNY Upstate Medical University, Syracuse, New York 13210
| | - C Ross Schmidtlein
- Department of Medical Physics, Memorial Sloan Kettering Cancer Center, New York, New York 10065
| | | | - Lixin Shen
- Guangdong Provincial Key Laboratory of Computational Science, School of Mathematics and Computational Sciences, Sun Yat-sen University, Guangzhou 510275, China and Department of Mathematics, Syracuse University, Syracuse, New York 13244
| | - Edward Lipson
- Department of Physics, Syracuse University, Syracuse, New York 13244
| | - David Feiglin
- Department of Radiology, SUNY Upstate Medical University, Syracuse, New York 13210
| | - Yuesheng Xu
- Guangdong Provincial Key Laboratory of Computational Science, School of Mathematics and Computational Sciences, Sun Yat-sen University, Guangzhou 510275, China
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Hung GU, Wang YF, Su HY, Hsieh TC, Ko CL, Yen RF. New Trends in Radionuclide Myocardial Perfusion Imaging. ACTA CARDIOLOGICA SINICA 2016; 32:156-66. [PMID: 27122946 DOI: 10.6515/acs20150803a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
UNLABELLED Radionuclide myocardial perfusion imaging (MPI) with single photon emission computed tomography (SPECT) has been widely used clinically as one of the major functional imaging modalities for patients with coronary artery disease (CAD) for decades. Ample evidence has supported the use of MPI as a useful and important tool in the diagnosis, risk stratification and treatment planning for CAD. Although popular in the United States, MPI has become the most frequently used imaging modality among all nuclear medicine tests in Taiwan. However, it should be acknowledged that MPI SPECT does have its limitations. These include false-positive results due to certain artifacts, false-negative due to balanced ischemia, complexity and adverse reaction arising from current pharmacological stressors, time consuming nature of the imaging procedure, no blood flow quantitation and relatively high radiation exposure. The purpose of this article was to review the recent trends in nuclear cardiology, including the utilization of positron emission tomography (PET) for MPI, new stressor, new SPECT camera with higher resolution and higher sensitivity, dynamic SPECT protocol for blood flow quantitation, new software of phase analysis for evaluation of LV dyssynchrony, and measures utilized for reducing radiation exposure of MPI. KEY WORDS Coronary artery disease • Myocardial flow reserve • Myocardial perfusion imaging • Phase analysis • PET • SPECT.
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Affiliation(s)
- Guang-Uei Hung
- Department of Nuclear Medicine, Chang Bing Show Chwan Memorial Hospital, Changhua
| | - Yuh-Feng Wang
- Department of Nuclear Medicine, Buddhist Dalin Tzu Chi General Hospital, Chiayi; ; School of Medicine, Tzu Chi University, Hualian
| | - Hung-Yi Su
- Department of Nuclear Medicine, Cathay General Hospital, Taipei
| | - Te-Chun Hsieh
- Department of Nuclear Medicine and PET Center, China Medical University Hospital; ; Department of Biomedical Imaging and Radiological Science, China Medical University, Taichung
| | - Chi-Lun Ko
- Department of Nuclear Medicine, National Taiwan University Hospital Yun-Lin Branch, Yun-Lin
| | - Ruoh-Fang Yen
- Department of Nuclear Medicine, National Taiwan University Hospital; ; Department of Radiology, National Taiwan University College of Medicine, Taipei, Taiwan
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Bailliez A, Lairez O, Merlin C, Piriou N, Legallois D, Blaire T, Agostini D, Valette F, Manrique A. Left Ventricular Function Assessment Using 2 Different Cadmium-Zinc-Telluride Cameras Compared with a γ-Camera with Cardiofocal Collimators: Dynamic Cardiac Phantom Study and Clinical Validation. J Nucl Med 2016; 57:1370-5. [DOI: 10.2967/jnumed.115.168575] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Accepted: 03/26/2016] [Indexed: 11/16/2022] Open
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Marcassa C, Zoccarato O. Radiation Dose Reduction from Radionuclide Myocardial Perfusion Imaging. CURRENT CARDIOVASCULAR IMAGING REPORTS 2016. [DOI: 10.1007/s12410-015-9364-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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48
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Caobelli F, Akin M, Thackeray JT, Brunkhorst T, Widder J, Berding G, Burchert I, Bauersachs J, Bengel FM. Diagnostic accuracy of cadmium-zinc-telluride-based myocardial perfusion SPECT: impact of attenuation correction using a co-registered external computed tomography. Eur Heart J Cardiovasc Imaging 2015; 17:1036-43. [PMID: 26628617 DOI: 10.1093/ehjci/jev312] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Accepted: 10/29/2015] [Indexed: 11/13/2022] Open
Abstract
INTRODUCTION Computed tomography (CT)-based attenuation correction (AC) improves the accuracy of standard myocardial perfusion SPECT. Most dedicated cadmium-zinc-telluride (CZT) SPECT cameras are not equipped with an integrated CT component. We aimed to determine the impact of AC on diagnostic performance of CZT SPECT using co-registration with an external low-dose CT. METHODS Sixty patients underwent CZT SPECT (GE Discovery 530c) with (99m)Tc-sestamibi at rest and following regadenoson stress. Using commercial software, SPECT images were co-registered with a low-dose CT acquired on a separate system (GE Discovery 670NMCT). Attenuation corrected and non-corrected (NC) images were reconstructed using an iterative algorithm. Accuracy was measured in 44 patients who had undergone invasive angiography within 6 months. Normalcy was compared in the remaining 16 patients who had a low pre-test likelihood (<5%) of coronary artery disease (CAD). RESULTS Summed stress and rest scores were significantly lower in AC images (9 ± 8 vs. 13 ± 9 and 6 ± 7 vs. 10 ± 9, P = 0.01), while summed difference score did not differ. According to angiography, 38 patients had significant CAD in 71 vascular territories. Attenuation correction improved accuracy globally (P = 0.03) and in RCA territory (P = 0.008). Specificity improved both globally (100 vs. 40%, P < 0.05) and in each individual territory (LAD: 63 vs. 36%, LCX: 70 vs. 33%, RCA: 81 vs. 19%, P < 0.01). Normalcy was 100% for AC and 62.5% for NC images (P < 0.05). CONCLUSION Attenuation correction with a co-registered external CT is feasible using CZT cameras and improves diagnostic accuracy mostly by improving specificity over uncorrected images.
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Affiliation(s)
- Federico Caobelli
- Department of Nuclear Medicine, Hannover Medical School, Carl Neuberg Strasse, 1, 30625 Hannover, Germany
| | - Muharrem Akin
- Department of Clinical Cardiology, Hannover Medical School, Hannover, Germany
| | - James T Thackeray
- Department of Nuclear Medicine, Hannover Medical School, Carl Neuberg Strasse, 1, 30625 Hannover, Germany
| | - Thomas Brunkhorst
- Department of Nuclear Medicine, Hannover Medical School, Carl Neuberg Strasse, 1, 30625 Hannover, Germany
| | - Julian Widder
- Department of Clinical Cardiology, Hannover Medical School, Hannover, Germany
| | - Georg Berding
- Department of Nuclear Medicine, Hannover Medical School, Carl Neuberg Strasse, 1, 30625 Hannover, Germany
| | - Ina Burchert
- Department of Nuclear Medicine, Hannover Medical School, Carl Neuberg Strasse, 1, 30625 Hannover, Germany
| | - Johann Bauersachs
- Department of Clinical Cardiology, Hannover Medical School, Hannover, Germany
| | - Frank M Bengel
- Department of Nuclear Medicine, Hannover Medical School, Carl Neuberg Strasse, 1, 30625 Hannover, Germany
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Shibutani T, Onoguchi M, Funayama R, Nakajima K, Matsuo S, Yoneyama H, Konishi T, Kinuya S. [The Optimal Reconstruction Parameters by Scatter and Attenuation Corrections Using Multi-focus Collimator System in Thallium-201 Myocardial Perfusion SPECT Study]. Nihon Hoshasen Gijutsu Gakkai Zasshi 2015; 71:1103-1112. [PMID: 26596202 DOI: 10.6009/jjrt.2015_jsrt_71.11.1103] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The aim of this study was to reveal the optimal reconstruction parameters of ordered subset conjugates gradient minimizer (OSCGM) by no correction (NC), attenuation correction (AC), and AC+scatter correction (ACSC) using IQ-single photon emission computed tomography (SPECT) system in thallium-201 myocardial perfusion SPECT. Myocardial phantom acquired two patterns, with or without defect. Myocardial images were performed 5-point scale visual score and quantitative evaluations using contrast, uptake, and uniformity about the subset and update (subset×iteration) of OSCGM and the full width at half maximum (FWHM) of Gaussian filter by three corrections. We decided on optimal reconstruction parameters of OSCGM by three corrections. The number of subsets to create suitable images were 3 or 5 for NC and AC, 2 or 3 for ACSC. The updates to create suitable images were 30 or 40 for NC, 40 or 60 for AC, and 30 for ACSC. Furthermore, the FWHM of Gaussian filters were 9.6 mm or 12 mm for NC and ACSC, 7.2 mm or 9.6 mm for AC. In conclusion, the following optimal reconstruction parameters of OSCGM were decided; NC: subset 5, iteration 8 and FWHM 9.6 mm, AC: subset 5, iteration 8 and FWHM 7.2 mm, ACSC: subset 3, iteration 10 and FWHM 9.6 mm.
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Affiliation(s)
- Takayuki Shibutani
- Department of Quantum Medical Technology, Faculty of Health Sciences, Kanazawa University
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Andersson M, Mattsson S. Dose management in conventional nuclear medicine imaging and PET. Clin Transl Imaging 2015. [DOI: 10.1007/s40336-015-0150-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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