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Overbeck N, Ahangari S, Conti M, Panin V, Azam A, Kurbegovic S, Kjær A, Højgaard L, Korsholm K, Fischer BM, Andersen FL, Andersen TL. Improved Positron Emission Tomography Quantification: Evaluation of a Maximum-Likelihood Scatter Scaling Algorithm. Diagnostics (Basel) 2024; 14:1075. [PMID: 38893602 PMCID: PMC11172368 DOI: 10.3390/diagnostics14111075] [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: 04/23/2024] [Revised: 05/17/2024] [Accepted: 05/20/2024] [Indexed: 06/21/2024] Open
Abstract
Incorrect scatter scaling of positron emission tomography (PET) images can lead to halo artifacts, quantitative bias, or reconstruction failure. Tail-fitted scatter scaling (TFSS) possesses performance limitations in multiple cases. This study aims to investigate a novel method for scatter scaling: maximum-likelihood scatter scaling (MLSS) in scenarios where TFSS tends to induce artifacts or are observed to cause reconstruction abortion. [68Ga]Ga-RGD PET scans of nine patients were included in cohort 1 in the scope of investigating the reduction of halo artifacts relative to the scatter estimation method. PET scans of 30 patients administrated with [68Ga]Ga-uPAR were included in cohort 2, used for an evaluation of the robustness of MLSS in cases where TFSS-integrated reconstructions are observed to fail. A visual inspection of MLSS-corrected images scored higher than TFSS-corrected reconstructions of cohort 1. The quantitative investigation near the bladder showed a relative difference in tracer uptake of up to 94.7%. A reconstruction of scans included in cohort 2 resulted in failure in 23 cases when TFSS was used. The lesion uptake values of cohort 2 showed no significant difference. MLSS is suggested as an alternative scatter-scaling method relative to TFSS with the aim of reducing halo artifacts and a robust reconstruction process.
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Affiliation(s)
- Nanna Overbeck
- Department of Clinical Physiology and Nuclear Medicine, Copenhagen University Hospital—Rigshospitalet, 2100 Copenhagen, Denmark; (N.O.); (A.K.); (L.H.); (K.K.); (B.M.F.); (F.L.A.)
| | - Sahar Ahangari
- Department of Clinical Physiology and Nuclear Medicine, Copenhagen University Hospital—Rigshospitalet, 2100 Copenhagen, Denmark; (N.O.); (A.K.); (L.H.); (K.K.); (B.M.F.); (F.L.A.)
| | - Maurizio Conti
- Siemens Medical Solutions Inc., Knoxville, TN 37932, USA; (M.C.); (V.P.)
| | - Vladimir Panin
- Siemens Medical Solutions Inc., Knoxville, TN 37932, USA; (M.C.); (V.P.)
| | - Aleena Azam
- Cluster for Molecular Imaging, Copenhagen University Hospital—Rigshospitalet, 2100 Copenhagen, Denmark; (A.A.); (S.K.)
- Department of Biomedical Sciences, University of Copenhagen, 2100 Copenhagen, Denmark
- Department of Neurosurgery, Neuroscience Center, Copenhagen University Hospital—Rigshospitalet, 2100 Copenhagen, Denmark
| | - Sorel Kurbegovic
- Cluster for Molecular Imaging, Copenhagen University Hospital—Rigshospitalet, 2100 Copenhagen, Denmark; (A.A.); (S.K.)
- Department of Biomedical Sciences, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Andreas Kjær
- Department of Clinical Physiology and Nuclear Medicine, Copenhagen University Hospital—Rigshospitalet, 2100 Copenhagen, Denmark; (N.O.); (A.K.); (L.H.); (K.K.); (B.M.F.); (F.L.A.)
- Cluster for Molecular Imaging, Copenhagen University Hospital—Rigshospitalet, 2100 Copenhagen, Denmark; (A.A.); (S.K.)
- Department of Biomedical Sciences, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Liselotte Højgaard
- Department of Clinical Physiology and Nuclear Medicine, Copenhagen University Hospital—Rigshospitalet, 2100 Copenhagen, Denmark; (N.O.); (A.K.); (L.H.); (K.K.); (B.M.F.); (F.L.A.)
| | - Kirsten Korsholm
- Department of Clinical Physiology and Nuclear Medicine, Copenhagen University Hospital—Rigshospitalet, 2100 Copenhagen, Denmark; (N.O.); (A.K.); (L.H.); (K.K.); (B.M.F.); (F.L.A.)
| | - Barbara Malene Fischer
- Department of Clinical Physiology and Nuclear Medicine, Copenhagen University Hospital—Rigshospitalet, 2100 Copenhagen, Denmark; (N.O.); (A.K.); (L.H.); (K.K.); (B.M.F.); (F.L.A.)
| | - Flemming Littrup Andersen
- Department of Clinical Physiology and Nuclear Medicine, Copenhagen University Hospital—Rigshospitalet, 2100 Copenhagen, Denmark; (N.O.); (A.K.); (L.H.); (K.K.); (B.M.F.); (F.L.A.)
| | - Thomas Lund Andersen
- Department of Clinical Physiology and Nuclear Medicine, Copenhagen University Hospital—Rigshospitalet, 2100 Copenhagen, Denmark; (N.O.); (A.K.); (L.H.); (K.K.); (B.M.F.); (F.L.A.)
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Shiri I, Salimi Y, Maghsudi M, Jenabi E, Harsini S, Razeghi B, Mostafaei S, Hajianfar G, Sanaat A, Jafari E, Samimi R, Khateri M, Sheikhzadeh P, Geramifar P, Dadgar H, Bitrafan Rajabi A, Assadi M, Bénard F, Vafaei Sadr A, Voloshynovskiy S, Mainta I, Uribe C, Rahmim A, Zaidi H. Differential privacy preserved federated transfer learning for multi-institutional 68Ga-PET image artefact detection and disentanglement. Eur J Nucl Med Mol Imaging 2023; 51:40-53. [PMID: 37682303 PMCID: PMC10684636 DOI: 10.1007/s00259-023-06418-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Accepted: 08/24/2023] [Indexed: 09/09/2023]
Abstract
PURPOSE Image artefacts continue to pose challenges in clinical molecular imaging, resulting in misdiagnoses, additional radiation doses to patients and financial costs. Mismatch and halo artefacts occur frequently in gallium-68 (68Ga)-labelled compounds whole-body PET/CT imaging. Correcting for these artefacts is not straightforward and requires algorithmic developments, given that conventional techniques have failed to address them adequately. In the current study, we employed differential privacy-preserving federated transfer learning (FTL) to manage clinical data sharing and tackle privacy issues for building centre-specific models that detect and correct artefacts present in PET images. METHODS Altogether, 1413 patients with 68Ga prostate-specific membrane antigen (PSMA)/DOTA-TATE (TOC) PET/CT scans from 3 countries, including 8 different centres, were enrolled in this study. CT-based attenuation and scatter correction (CT-ASC) was used in all centres for quantitative PET reconstruction. Prior to model training, an experienced nuclear medicine physician reviewed all images to ensure the use of high-quality, artefact-free PET images (421 patients' images). A deep neural network (modified U2Net) was trained on 80% of the artefact-free PET images to utilize centre-based (CeBa), centralized (CeZe) and the proposed differential privacy FTL frameworks. Quantitative analysis was performed in 20% of the clean data (with no artefacts) in each centre. A panel of two nuclear medicine physicians conducted qualitative assessment of image quality, diagnostic confidence and image artefacts in 128 patients with artefacts (256 images for CT-ASC and FTL-ASC). RESULTS The three approaches investigated in this study for 68Ga-PET imaging (CeBa, CeZe and FTL) resulted in a mean absolute error (MAE) of 0.42 ± 0.21 (CI 95%: 0.38 to 0.47), 0.32 ± 0.23 (CI 95%: 0.27 to 0.37) and 0.28 ± 0.15 (CI 95%: 0.25 to 0.31), respectively. Statistical analysis using the Wilcoxon test revealed significant differences between the three approaches, with FTL outperforming CeBa and CeZe (p-value < 0.05) in the clean test set. The qualitative assessment demonstrated that FTL-ASC significantly improved image quality and diagnostic confidence and decreased image artefacts, compared to CT-ASC in 68Ga-PET imaging. In addition, mismatch and halo artefacts were successfully detected and disentangled in the chest, abdomen and pelvic regions in 68Ga-PET imaging. CONCLUSION The proposed approach benefits from using large datasets from multiple centres while preserving patient privacy. Qualitative assessment by nuclear medicine physicians showed that the proposed model correctly addressed two main challenging artefacts in 68Ga-PET imaging. This technique could be integrated in the clinic for 68Ga-PET imaging artefact detection and disentanglement using multicentric heterogeneous datasets.
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Affiliation(s)
- Isaac Shiri
- Division of Nuclear Medicine and Molecular Imaging, Geneva University Hospital, CH-1211, Geneva, Switzerland
- Department of Cardiology, Inselspital, University of Bern, Bern, Switzerland
| | - Yazdan Salimi
- Division of Nuclear Medicine and Molecular Imaging, Geneva University Hospital, CH-1211, Geneva, Switzerland
| | - Mehdi Maghsudi
- Rajaie Cardiovascular Medical and Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - Elnaz Jenabi
- Research Center for Nuclear Medicine, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Sara Harsini
- BC Cancer Research Institute, Vancouver, BC, Canada
| | - Behrooz Razeghi
- Department of Computer Science, University of Geneva, Geneva, Switzerland
| | - Shayan Mostafaei
- Division of Clinical Geriatrics, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden
- Department of Medical Epidemiology and Biostatistics, Karolinska Institute, Stockholm, Sweden
| | - Ghasem Hajianfar
- Division of Nuclear Medicine and Molecular Imaging, Geneva University Hospital, CH-1211, Geneva, Switzerland
| | - Amirhossein Sanaat
- Division of Nuclear Medicine and Molecular Imaging, Geneva University Hospital, CH-1211, Geneva, Switzerland
| | - Esmail Jafari
- The Persian Gulf Nuclear Medicine Research Center, Department of Nuclear Medicine, Molecular Imaging, and Theranostics, Bushehr Medical University Hospital, School of Medicine, Bushehr University of Medical Sciences, Bushehr, Iran
| | - Rezvan Samimi
- Department of Medical Radiation Engineering, Shahid Beheshti University, Tehran, Iran
| | - Maziar Khateri
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Peyman Sheikhzadeh
- Department of Nuclear Medicine, Imam Khomeini Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran
| | - Parham Geramifar
- Research Center for Nuclear Medicine, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Habibollah Dadgar
- Cancer Research Center, Razavi Hospital, Imam Reza International University, Mashhad, Iran
| | - Ahmad Bitrafan Rajabi
- Rajaie Cardiovascular Medical and Research Center, Iran University of Medical Sciences, Tehran, Iran
- Echocardiography Research Center, Rajaie Cardiovascular Medical and Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - Majid Assadi
- The Persian Gulf Nuclear Medicine Research Center, Department of Nuclear Medicine, Molecular Imaging, and Theranostics, Bushehr Medical University Hospital, School of Medicine, Bushehr University of Medical Sciences, Bushehr, Iran
| | - François Bénard
- BC Cancer Research Institute, Vancouver, BC, Canada
- Department of Radiology, University of British Columbia, Vancouver, BC, Canada
| | - Alireza Vafaei Sadr
- Institute of Pathology, RWTH Aachen University Hospital, Aachen, Germany
- Department of Public Health Sciences, College of Medicine, The Pennsylvania State University, Hershey, PA, 17033, USA
| | | | - Ismini Mainta
- Division of Nuclear Medicine and Molecular Imaging, Geneva University Hospital, CH-1211, Geneva, Switzerland
| | - Carlos Uribe
- Department of Radiology, University of British Columbia, Vancouver, BC, Canada
- Molecular Imaging and Therapy, BC Cancer, Vancouver, BC, Canada
- Department of Integrative Oncology, BC Cancer Research Institute, Vancouver, BC, Canada
| | - Arman Rahmim
- Department of Radiology, University of British Columbia, Vancouver, BC, Canada
- Department of Integrative Oncology, BC Cancer Research Institute, Vancouver, BC, Canada
- Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada
| | - Habib Zaidi
- Division of Nuclear Medicine and Molecular Imaging, Geneva University Hospital, CH-1211, Geneva, Switzerland.
- Geneva University Neuro Center, Geneva University, Geneva, Switzerland.
- Department of Nuclear Medicine and Molecular Imaging, University of Groningen, University Medical Center Groningen, Groningen, Netherlands.
- Department of Nuclear Medicine, University of Southern Denmark, Odense, Denmark.
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Tarcha Z, Konstantinoff KS, Ince S, Fraum TJ, Sadowski EA, Bhosale PR, Derenoncourt PR, Zulfiqar M, Shetty AS, Ponisio MR, Mhlanga JC, Itani M. Added Value of FDG PET/MRI in Gynecologic Oncology: A Pictorial Review. Radiographics 2023; 43:e230006. [PMID: 37410624 DOI: 10.1148/rg.230006] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/08/2023]
Abstract
Fluorine 18-fluorodeoxyglucose (FDG) PET and MRI independently play a valuable role in the management of patients with gynecologic malignancies, particularly endometrial and cervical cancer. The PET/MRI hybrid imaging technique combines the metabolic information obtained from PET with the excellent soft-tissue resolution and anatomic details provided by MRI in a single examination. MRI is the modality of choice for assessment of local tumor extent in the pelvis, whereas PET is used to assess for local-regional spread and distant metastases. The authors discuss the added value of FDG PET/MRI in imaging gynecologic malignancies of the pelvis, with a focus on the role of FDG PET/MRI in diagnosis, staging, assessing treatment response, and characterizing complications. PET/MRI allows better localization and demarcation of the extent of disease, characterization of lesions and involvement of adjacent organs and lymph nodes, and improved differentiation of benign from malignant tissues, as well as detection of the presence of distant metastasis. It also has the advantages of decreased radiation dose and a higher signal-to-noise ratio of a prolonged PET examination of the pelvis contemporaneous with MRI. The authors provide a brief technical overview of PET/MRI, highlight how simultaneously performed PET/MRI can improve stand-alone MRI and PET/CT in gynecologic malignancies, provide an image-rich review to illustrate practical and clinically relevant applications of this imaging technique, and review common pitfalls encountered in clinical practice. ©RSNA, 2023 Quiz questions for this article are available in the supplemental material.
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Affiliation(s)
- Ziad Tarcha
- From the Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 S Kingshighway Blvd, St. Louis, MO, 63110-8131 (Z.T., K.S.K., S.I., T.J.F., P.R.D., A.S.S., M.R.P., J.C.M., M.I.); Department of Radiology, Obstetrics and Gynecology, University of Wisconsin School of Medicine and Public Health, 600 Highland Ave, Madison, Wis (E.A.S.); Department of Diagnostic Radiology, The University of Texas MD Anderson Cancer Center, Houston, Tex (P.R.B.); and Department of Radiology, Mayo Clinic, Scottsdale, Ariz (M.Z.)
| | - Katerina S Konstantinoff
- From the Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 S Kingshighway Blvd, St. Louis, MO, 63110-8131 (Z.T., K.S.K., S.I., T.J.F., P.R.D., A.S.S., M.R.P., J.C.M., M.I.); Department of Radiology, Obstetrics and Gynecology, University of Wisconsin School of Medicine and Public Health, 600 Highland Ave, Madison, Wis (E.A.S.); Department of Diagnostic Radiology, The University of Texas MD Anderson Cancer Center, Houston, Tex (P.R.B.); and Department of Radiology, Mayo Clinic, Scottsdale, Ariz (M.Z.)
| | - Semra Ince
- From the Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 S Kingshighway Blvd, St. Louis, MO, 63110-8131 (Z.T., K.S.K., S.I., T.J.F., P.R.D., A.S.S., M.R.P., J.C.M., M.I.); Department of Radiology, Obstetrics and Gynecology, University of Wisconsin School of Medicine and Public Health, 600 Highland Ave, Madison, Wis (E.A.S.); Department of Diagnostic Radiology, The University of Texas MD Anderson Cancer Center, Houston, Tex (P.R.B.); and Department of Radiology, Mayo Clinic, Scottsdale, Ariz (M.Z.)
| | - Tyler J Fraum
- From the Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 S Kingshighway Blvd, St. Louis, MO, 63110-8131 (Z.T., K.S.K., S.I., T.J.F., P.R.D., A.S.S., M.R.P., J.C.M., M.I.); Department of Radiology, Obstetrics and Gynecology, University of Wisconsin School of Medicine and Public Health, 600 Highland Ave, Madison, Wis (E.A.S.); Department of Diagnostic Radiology, The University of Texas MD Anderson Cancer Center, Houston, Tex (P.R.B.); and Department of Radiology, Mayo Clinic, Scottsdale, Ariz (M.Z.)
| | - Elizabeth A Sadowski
- From the Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 S Kingshighway Blvd, St. Louis, MO, 63110-8131 (Z.T., K.S.K., S.I., T.J.F., P.R.D., A.S.S., M.R.P., J.C.M., M.I.); Department of Radiology, Obstetrics and Gynecology, University of Wisconsin School of Medicine and Public Health, 600 Highland Ave, Madison, Wis (E.A.S.); Department of Diagnostic Radiology, The University of Texas MD Anderson Cancer Center, Houston, Tex (P.R.B.); and Department of Radiology, Mayo Clinic, Scottsdale, Ariz (M.Z.)
| | - Priya R Bhosale
- From the Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 S Kingshighway Blvd, St. Louis, MO, 63110-8131 (Z.T., K.S.K., S.I., T.J.F., P.R.D., A.S.S., M.R.P., J.C.M., M.I.); Department of Radiology, Obstetrics and Gynecology, University of Wisconsin School of Medicine and Public Health, 600 Highland Ave, Madison, Wis (E.A.S.); Department of Diagnostic Radiology, The University of Texas MD Anderson Cancer Center, Houston, Tex (P.R.B.); and Department of Radiology, Mayo Clinic, Scottsdale, Ariz (M.Z.)
| | - Paul-Robert Derenoncourt
- From the Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 S Kingshighway Blvd, St. Louis, MO, 63110-8131 (Z.T., K.S.K., S.I., T.J.F., P.R.D., A.S.S., M.R.P., J.C.M., M.I.); Department of Radiology, Obstetrics and Gynecology, University of Wisconsin School of Medicine and Public Health, 600 Highland Ave, Madison, Wis (E.A.S.); Department of Diagnostic Radiology, The University of Texas MD Anderson Cancer Center, Houston, Tex (P.R.B.); and Department of Radiology, Mayo Clinic, Scottsdale, Ariz (M.Z.)
| | - Maria Zulfiqar
- From the Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 S Kingshighway Blvd, St. Louis, MO, 63110-8131 (Z.T., K.S.K., S.I., T.J.F., P.R.D., A.S.S., M.R.P., J.C.M., M.I.); Department of Radiology, Obstetrics and Gynecology, University of Wisconsin School of Medicine and Public Health, 600 Highland Ave, Madison, Wis (E.A.S.); Department of Diagnostic Radiology, The University of Texas MD Anderson Cancer Center, Houston, Tex (P.R.B.); and Department of Radiology, Mayo Clinic, Scottsdale, Ariz (M.Z.)
| | - Anup S Shetty
- From the Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 S Kingshighway Blvd, St. Louis, MO, 63110-8131 (Z.T., K.S.K., S.I., T.J.F., P.R.D., A.S.S., M.R.P., J.C.M., M.I.); Department of Radiology, Obstetrics and Gynecology, University of Wisconsin School of Medicine and Public Health, 600 Highland Ave, Madison, Wis (E.A.S.); Department of Diagnostic Radiology, The University of Texas MD Anderson Cancer Center, Houston, Tex (P.R.B.); and Department of Radiology, Mayo Clinic, Scottsdale, Ariz (M.Z.)
| | - Maria R Ponisio
- From the Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 S Kingshighway Blvd, St. Louis, MO, 63110-8131 (Z.T., K.S.K., S.I., T.J.F., P.R.D., A.S.S., M.R.P., J.C.M., M.I.); Department of Radiology, Obstetrics and Gynecology, University of Wisconsin School of Medicine and Public Health, 600 Highland Ave, Madison, Wis (E.A.S.); Department of Diagnostic Radiology, The University of Texas MD Anderson Cancer Center, Houston, Tex (P.R.B.); and Department of Radiology, Mayo Clinic, Scottsdale, Ariz (M.Z.)
| | - Joyce C Mhlanga
- From the Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 S Kingshighway Blvd, St. Louis, MO, 63110-8131 (Z.T., K.S.K., S.I., T.J.F., P.R.D., A.S.S., M.R.P., J.C.M., M.I.); Department of Radiology, Obstetrics and Gynecology, University of Wisconsin School of Medicine and Public Health, 600 Highland Ave, Madison, Wis (E.A.S.); Department of Diagnostic Radiology, The University of Texas MD Anderson Cancer Center, Houston, Tex (P.R.B.); and Department of Radiology, Mayo Clinic, Scottsdale, Ariz (M.Z.)
| | - Malak Itani
- From the Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 S Kingshighway Blvd, St. Louis, MO, 63110-8131 (Z.T., K.S.K., S.I., T.J.F., P.R.D., A.S.S., M.R.P., J.C.M., M.I.); Department of Radiology, Obstetrics and Gynecology, University of Wisconsin School of Medicine and Public Health, 600 Highland Ave, Madison, Wis (E.A.S.); Department of Diagnostic Radiology, The University of Texas MD Anderson Cancer Center, Houston, Tex (P.R.B.); and Department of Radiology, Mayo Clinic, Scottsdale, Ariz (M.Z.)
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