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Wang K, Huq MS. Inverse shielding and mutual exclusion for PET-MR hybrid imaging concerning induced positronium hyperfine splits radiations. Sci Rep 2023; 13:20522. [PMID: 37993545 PMCID: PMC10665340 DOI: 10.1038/s41598-023-44303-3] [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: 06/10/2022] [Accepted: 10/06/2023] [Indexed: 11/24/2023] Open
Abstract
Prevalent PET imaging reconstructs 2γ-photon pairs emitted after an annihilation from para-positronium (p-Ps) and rejects 3γ events from ortho-positronium (o-Ps) as noises. The 3γ/2γ decay ratio is ~ 3/7 in human body theoretically but in fact significantly lower due to pick-off process, hence PET imaging quality is well controlled. In a PET-MR hybrid unit, the MR magnetic field alters positronium decay patterns through magnetic quenching: all o-Ps and excited p-Ps states are split into finer quantum states under strong magnetic field, thus transitions between some triplet and singlet finer states (mz = 0) were no longer forbidden, thus some o-Ps converts to p-Ps spontaneously by emitting hyperfine split (HFS) photons, which also drops 3γ/2γ ratio hence helps PET imaging quality. However, inverse magnetic quenching might also occur if any external source of HFS frequencies is nearby, thus many p-Ps convert to o-Ps by absorbing those HFS photons (induced HFS transitions). This will dramatically increase 3γ/2γ ratio and hence degrade PET imaging quality instantaneously. The HFS spectrum lies in a broad range of microwaves, from 0.02 to 200 GHz. To prevent inverse magnetic quenching, it is necessary to block external microwave sources outside the hybrid vault, by adding a thin metal layer at all directions of the vault. This could be achieved by adopting the metallic Faraday Cage, which was originally for MR shielding, with possible amendment if necessary. The frequencies of excitation pulses in MR imaging overlap with HFS spectrum, however, the chance for mutual interference during hybrid imaging is small, hence there seems no need to veto each other during hybrid scans.
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Affiliation(s)
- Kelin Wang
- UPMC Hillman Cancer Center, Pittsburgh, PA, USA.
- University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.
| | - M Saiful Huq
- UPMC Hillman Cancer Center, Pittsburgh, PA, USA
- University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
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Padwal J, Baratto L, Chakraborty A, Hawk K, Spunt S, Avedian R, Daldrup-Link HE. PET/MR of pediatric bone tumors: what the radiologist needs to know. Skeletal Radiol 2023; 52:315-328. [PMID: 35804163 PMCID: PMC9826799 DOI: 10.1007/s00256-022-04113-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Revised: 06/11/2022] [Accepted: 06/29/2022] [Indexed: 02/02/2023]
Abstract
Integrated 2-deoxy-2-[fluorine-18]fluoro-D-glucose (18F-FDG) positron emission tomography (PET)/magnetic resonance (MR) imaging can provide "one stop" local tumor and whole-body staging in one session, thereby streamlining imaging evaluations and avoiding duplicate anesthesia in young children. 18F-FDG PET/MR scans have the benefit of lower radiation, superior soft tissue contrast, and increased patient convenience compared to 18F-FDG PET/computerized tomography scans. This article reviews the 18F-FDG PET/MR imaging technique, reporting requirements, and imaging characteristics of the most common pediatric bone tumors, including osteosarcoma, Ewing sarcoma, primary bone lymphoma, bone and bone marrow metastases, and Langerhans cell histiocytosis.
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Affiliation(s)
- Jennifer Padwal
- Department of Radiology, Stanford University, Stanford, CA, 94305, USA
| | - Lucia Baratto
- Department of Radiology, Stanford University, Stanford, CA, 94305, USA
| | - Amit Chakraborty
- Department of Radiology, Massachusetts General Hospital, Boston, MA, 02114, USA
| | - Kristina Hawk
- Department of Radiology, Stanford University, Stanford, CA, 94305, USA
| | - Sheri Spunt
- Department of Pediatrics, Stanford University, 725 Welch Rd., Rm. 1665, Stanford, CA, 94305-5614, USA
| | - Raffi Avedian
- Department of Surgery, Division of Pediatric Orthopedic Surgery, Lucile Packard Children's Hospital, Stanford University, Stanford, CA, 94305, USA
| | - Heike E Daldrup-Link
- Department of Radiology, Stanford University, Stanford, CA, 94305, USA.
- Cancer Imaging Program, Stanford Cancer Institute, Stanford, USA.
- Department of Pediatrics, Stanford University, 725 Welch Rd., Rm. 1665, Stanford, CA, 94305-5614, USA.
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Zhang Z, Zhou N, Guo X, Li N, Zhu H, Yang Z. Pretherapeutic Assessment of Pancreatic Cancer: Comparison of FDG PET/CT Plus Delayed PET/MR and Contrast-Enhanced CT/MR. Front Oncol 2022; 11:790462. [PMID: 35096590 PMCID: PMC8794800 DOI: 10.3389/fonc.2021.790462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Accepted: 12/20/2021] [Indexed: 12/24/2022] Open
Abstract
PURPOSE This study aims to determine the diagnostic performance of whole-body FDG PET/CT plus delayed abdomen PET/MR imaging in the pretherapeutic assessment of pancreatic cancer in comparison with that of contrast-enhanced (CE)-CT/MR imaging. MATERIALS AND METHODS Forty patients with pancreatic cancer underwent nonenhanced whole-body FDG PET/CT, delayed abdomen PET/MR imaging, and CE-CT/MR imaging. Two nuclear medicine physicians independently reviewed these images and discussed to reach a consensus, determining tumor resectability according to a 5-point scale, N stage (N0 or N positive), and M stage (M0 or M1). With use of clinical-surgical-pathologic findings as the reference standard, diagnostic performances of the two imaging sets were compared by using the McNemar test. RESULTS The diagnostic performance of FDG PET/CT plus delayed PET/MR imaging was not significantly different from that of CE-CT/MR imaging in the assessment of tumor resectability [area under the receiver operating characteristic curve: 0.927 vs. 0.925 (p = 0.975)], N stage (accuracy: 80% (16 of 20 patients) vs. 55% (11 of 20 patients), p = 0.125), and M stage (accuracy: 100% (40 of 40 patients) vs. 93% (37 of 40 patients), p = 0.250). Moreover, 14 of 40 patients had liver metastases. The number of liver metastases detected by CE-CT/MR imaging, PET/CT, and PET/MR imaging were 33, 18, and 61, respectively. Compared with CE-CT/MR imaging, PET/MR imaging resulted in additional findings of more liver metastases in 9/14 patients, of which 3 patients were upstaged. Compared with PET/CT, PET/MR imaging resulted in additional findings of more liver metastases in 12/14 patients, of which 6 patients were upstaged. CONCLUSIONS Although FDG PET/CT plus delayed PET/MR imaging showed a diagnostic performance similar to that of CE-CT/MR imaging in the pretherapeutic assessment of the resectability and staging of pancreatic tumors, it still has potential as the more efficient and reasonable work-up approach for the additional value of metastatic information provided by delayed PET/MR imaging.
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Affiliation(s)
- Zaizhu Zhang
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), NMPA Key Laboratory for Research and Evaluation of Radiopharmaceuticals (National Medical Products Administration), Department of Nuclear Medicine; Peking University Cancer Hospital & Institute, Beijing, China
| | - Nina Zhou
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), NMPA Key Laboratory for Research and Evaluation of Radiopharmaceuticals (National Medical Products Administration), Department of Nuclear Medicine; Peking University Cancer Hospital & Institute, Beijing, China
| | - Xiaoyi Guo
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), NMPA Key Laboratory for Research and Evaluation of Radiopharmaceuticals (National Medical Products Administration), Department of Nuclear Medicine; Peking University Cancer Hospital & Institute, Beijing, China
| | - Nan Li
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), NMPA Key Laboratory for Research and Evaluation of Radiopharmaceuticals (National Medical Products Administration), Department of Nuclear Medicine; Peking University Cancer Hospital & Institute, Beijing, China
| | - Hua Zhu
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), NMPA Key Laboratory for Research and Evaluation of Radiopharmaceuticals (National Medical Products Administration), Department of Nuclear Medicine; Peking University Cancer Hospital & Institute, Beijing, China
| | - Zhi Yang
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), NMPA Key Laboratory for Research and Evaluation of Radiopharmaceuticals (National Medical Products Administration), Department of Nuclear Medicine; Peking University Cancer Hospital & Institute, Beijing, China
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Lee JS, Kim KM, Choi Y, Kim HJ. A Brief History of Nuclear Medicine Physics, Instrumentation, and Data Sciences in Korea. Nucl Med Mol Imaging 2021; 55:265-284. [PMID: 34868376 DOI: 10.1007/s13139-021-00721-7] [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: 07/19/2021] [Revised: 10/14/2021] [Accepted: 10/18/2021] [Indexed: 10/19/2022] Open
Abstract
We review the history of nuclear medicine physics, instrumentation, and data sciences in Korea to commemorate the 60th anniversary of the Korean Society of Nuclear Medicine. In the 1970s and 1980s, the development of SPECT, nuclear stethoscope, and bone densitometry systems, as well as kidney and cardiac image analysis technology, marked the beginning of nuclear medicine physics and engineering in Korea. With the introduction of PET and cyclotron in Korea in 1994, nuclear medicine imaging research was further activated. With the support of large-scale government projects, the development of gamma camera, SPECT, and PET systems was carried out. Exploiting the use of PET scanners in conjunction with cyclotrons, extensive studies on myocardial blood flow quantification and brain image analysis were also actively pursued. In 2005, Korea's first domestic cyclotron succeeded in producing radioactive isotopes, and the cyclotron was provided to six universities and university hospitals, thereby facilitating the nationwide supply of PET radiopharmaceuticals. Since the late 2000s, research on PET/MRI has been actively conducted, and the advanced research results of Korean scientists in the fields of silicon photomultiplier PET and simultaneous PET/MRI have attracted significant attention from the academic community. Currently, Korean researchers are actively involved in endeavors to solve a variety of complex problems in nuclear medicine using artificial intelligence and deep learning technologies.
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Affiliation(s)
- Jae Sung Lee
- Department of Nuclear Medicine, Seoul National University College of Medicine, 103 Daehak-ro, Jongno-gu, Seoul, 03080 Korea
| | - Kyeong Min Kim
- Department of Isotopic Drug Development, Korea Radioisotope Center for Pharmaceuticals, Korea Institute of Radiological and Medical Sciences, Seoul, Korea
| | - Yong Choi
- Department of Electronic Engineering, Sogang University, Seoul, Korea
| | - Hee-Joung Kim
- Department of Radiological Science, Yonsei University, Wonju, Korea
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Son JW, Kim KY, Park JY, Kim K, Lee YS, Ko GB, Lee JS. SimPET: a Preclinical PET Insert for Simultaneous PET/MR Imaging. Mol Imaging Biol 2021; 22:1208-1217. [PMID: 32285357 DOI: 10.1007/s11307-020-01491-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
PURPOSE SimPET/M7 system is a small-animal dedicated simultaneous positron emission tomography and magnetic resonance imaging (PET/MRI) scanner. The SimPET insert has been upgraded from its prototype with a focus on count rate performance and sensitivity. The M7 scanner is a 1-T permanent magnet-based compact MRI system without any cryogens. Here, we present performance evaluation results of SimPET along with the results of mutual interference evaluation and simultaneously acquired PET/MR imaging. PROCEDURES Following NEMA NU 4-2008 standard, we evaluated the performance of the SimPET system. The M7 MRI compatibility of SimPET was also assessed by analyzing MRI images of a uniform phantom under different PET conditions and PET count rates with different MRI pulse sequences. Mouse imaging was performed including a whole-body 18F-NaF PET scan and a simultaneous PET/MRI scan with 64Cu-NOTA-ironoxide. RESULTS The spatial resolution at center based on 3D OSEM without and with warm background was 0.7 mm and 1.45 mm, respectively. Peak sensitivity was 4.21 % (energy window = 250-750 keV). The peak noise equivalent count rate with the same energy window was 151 kcps at 38.4 MBq. The uniformity was 4.42 %, and the spillover ratios in water- and air-filled chambers were 14.6 % and 12.7 %, respectively. In the hot rod phantom image, 0.75-mm-diameter rods were distinguishable. There were no remarkable differences in the SNR and uniformity of MRI images and PET count rates with different PET conditions and MRI pulse sequences. In the whole-body 18F-NaF PET images, fine skeletal structures were well resolved. In the simultaneous PET/MRI study with 64Cu-NOTA-ironoxide, both PET and MRI signals changed before and after injection of the dual-modal imaging probe, which was evident with the exact spatiotemporal correlation. CONCLUSIONS We demonstrated that the SimPET scanner has a high count rate performance and excellent spatial resolution. The combined SimPET/M7 enabled simultaneous PET/MR imaging studies with no remarkable mutual interference between the two imaging modalities.
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Affiliation(s)
- Jeong-Whan Son
- Brightonix Imaging Inc., Yeonmujang 5ga-gil, Seongdong-gu, Seoul, 04782, South Korea
| | - Kyeong Yun Kim
- Brightonix Imaging Inc., Yeonmujang 5ga-gil, Seongdong-gu, Seoul, 04782, South Korea.,Department of Biomedical Sciences, Seoul National University College of Medicine, 103 Daehak-ro, Jongno-gu, Seoul, 03080, South Korea.,Department of Nuclear Medicine, Seoul National University College of Medicine, 103 Daehak-ro, Jongno-gu, Seoul, 03080, South Korea
| | - Ji Yong Park
- Department of Biomedical Sciences, Seoul National University College of Medicine, 103 Daehak-ro, Jongno-gu, Seoul, 03080, South Korea.,Department of Nuclear Medicine, Seoul National University College of Medicine, 103 Daehak-ro, Jongno-gu, Seoul, 03080, South Korea
| | - Kyuwan Kim
- Brightonix Imaging Inc., Yeonmujang 5ga-gil, Seongdong-gu, Seoul, 04782, South Korea
| | - Yun-Sang Lee
- Department of Nuclear Medicine, Seoul National University College of Medicine, 103 Daehak-ro, Jongno-gu, Seoul, 03080, South Korea
| | - Guen Bae Ko
- Brightonix Imaging Inc., Yeonmujang 5ga-gil, Seongdong-gu, Seoul, 04782, South Korea. .,Department of Nuclear Medicine, Seoul National University College of Medicine, 103 Daehak-ro, Jongno-gu, Seoul, 03080, South Korea.
| | - Jae Sung Lee
- Brightonix Imaging Inc., Yeonmujang 5ga-gil, Seongdong-gu, Seoul, 04782, South Korea. .,Department of Biomedical Sciences, Seoul National University College of Medicine, 103 Daehak-ro, Jongno-gu, Seoul, 03080, South Korea. .,Department of Nuclear Medicine, Seoul National University College of Medicine, 103 Daehak-ro, Jongno-gu, Seoul, 03080, South Korea.
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Accurate Transmission-Less Attenuation Correction Method for Amyloid-β Brain PET Using Deep Neural Network. ELECTRONICS 2021. [DOI: 10.3390/electronics10151836] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The lack of physically measured attenuation maps (μ-maps) for attenuation and scatter correction is an important technical challenge in brain-dedicated stand-alone positron emission tomography (PET) scanners. The accuracy of the calculated attenuation correction is limited by the nonuniformity of tissue composition due to pathologic conditions and the complex structure of facial bones. The aim of this study is to develop an accurate transmission-less attenuation correction method for amyloid-β (Aβ) brain PET studies. We investigated the validity of a deep convolutional neural network trained to produce a CT-derived μ-map (μ-CT) from simultaneously reconstructed activity and attenuation maps using the MLAA (maximum likelihood reconstruction of activity and attenuation) algorithm for Aβ brain PET. The performance of three different structures of U-net models (2D, 2.5D, and 3D) were compared. The U-net models generated less noisy and more uniform μ-maps than MLAA μ-maps. Among the three different U-net models, the patch-based 3D U-net model reduced noise and cross-talk artifacts more effectively. The Dice similarity coefficients between the μ-map generated using 3D U-net and μ-CT in bone and air segments were 0.83 and 0.67. All three U-net models showed better voxel-wise correlation of the μ-maps compared to MLAA. The patch-based 3D U-net model was the best. While the uptake value of MLAA yielded a high percentage error of 20% or more, the uptake value of 3D U-nets yielded the lowest percentage error within 5%. The proposed deep learning approach that requires no transmission data, anatomic image, or atlas/template for PET attenuation correction remarkably enhanced the quantitative accuracy of the simultaneously estimated MLAA μ-maps from Aβ brain PET.
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Hwang D, Kang SK, Kim KY, Choi H, Seo S, Lee JS. Data-driven respiratory phase-matched PET attenuation correction without CT. Phys Med Biol 2021; 66. [PMID: 33910170 DOI: 10.1088/1361-6560/abfc8f] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Accepted: 04/28/2021] [Indexed: 12/20/2022]
Abstract
We propose a deep learning-based data-driven respiratory phase-matched gated-PET attenuation correction (AC) method that does not need a gated-CT. The proposed method is a multi-step process that consists of data-driven respiratory gating, gated attenuation map estimation using maximum-likelihood reconstruction of attenuation and activity (MLAA) algorithm, and enhancement of the gated attenuation maps using convolutional neural network (CNN). The gated MLAA attenuation maps enhanced by the CNN allowed for the phase-matched AC of gated-PET images. We conducted a non-rigid registration of the gated-PET images to generate motion-free PET images. We trained the CNN by conducting a 3D patch-based learning with 80 oncologic whole-body18F-fluorodeoxyglucose (18F-FDG) PET/CT scan data and applied it to seven regional PET/CT scans that cover the lower lung and upper liver. We investigated the impact of the proposed respiratory phase-matched AC of PET without utilizing CT on tumor size and standard uptake value (SUV) assessment, and PET image quality (%STD). The attenuation corrected gated and motion-free PET images generated using the proposed method yielded sharper organ boundaries and better noise characteristics than conventional gated and ungated PET images. A banana artifact observed in a phase-mismatched CT-based AC was not observed in the proposed approach. By employing the proposed method, the size of tumor was reduced by 12.3% and SUV90%was increased by 13.3% in tumors with larger movements than 5 mm. %STD of liver uptake was reduced by 11.1%. The deep learning-based data-driven respiratory phase-matched AC method improved the PET image quality and reduced the motion artifacts.
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Affiliation(s)
- Donghwi Hwang
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Republic of Korea.,Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Seung Kwan Kang
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Republic of Korea.,Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Kyeong Yun Kim
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Republic of Korea.,Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Hongyoon Choi
- Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Seongho Seo
- Department of Electronic Engineering, Pai Chai University, Daejeon, Republic of Korea
| | - Jae Sung Lee
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Republic of Korea.,Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea.,Institute of Radiation Medicine, Medical Research Center, Seoul National University College of Medicine, Seoul, Republic of Korea
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Kim JS, Park CR, Yoon SH, Lee JA, Kim TY, Yang HJ. Improvement of image quality using amplitude-based respiratory gating in PET-computed tomography scanning. Nucl Med Commun 2021; 42:553-565. [PMID: 33625179 DOI: 10.1097/mnm.0000000000001368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVES This study sought to provide data supporting the expanded clinical use of respiratory gating by assessing the diagnostic accuracy of breathing motion correction using amplitude-based respiratory gating. METHODS A respiratory movement tracking device was attached to a PET-computed tomography scanner, and images were obtained in respiratory gating mode using a motion phantom that was capable of sensing vertical motion. Specifically, after setting amplitude changes and intervals according to the movement cycle using a total of nine combinations of three waveforms and three amplitude ranges, respiratory motion-corrected images were reconstructed using the filtered back projection method. After defining areas of interest in the acquired images in the same image planes, statistical analyses were performed to compare differences in standardized uptake value (SUV), lesion volume, full width at half maximum (FWHM), signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR). RESULTS SUVmax increased by 89.9%, and lesion volume decreased by 27.9%. Full width at half maximum decreased by 53.9%, signal-to-noise ratio increased by 11% and contrast-to-noise ratio increased by 16.3%. Optimal results were obtained when using a rest waveform and 35% duty cycle, in which the change in amplitude in the respiratory phase signal was low, and a constant level of long breaths was maintained. CONCLUSIONS These results demonstrate that respiratory-gated PET-CT imaging can be used to accurately correct for SUV changes and image distortion caused by respiratory motion, thereby providing excellent imaging information and quality.
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Affiliation(s)
- Jung-Soo Kim
- Department of Radiological Technology, Dongnam Health University, Suwon
- Department of Biomedical Science, The Korea University, Sejong
| | - Chan-Rok Park
- Department of Biomedical Science, The Korea University, Sejong
- Department of Nuclear Medicine, Seoul National University Hospital, Seoul
| | - Seok-Hwan Yoon
- Department of Biomedical Science, The Korea University, Sejong
- Department of Nuclear Medicine, Seoul National University Hospital, Seoul
| | - Joo-Ah Lee
- Department of Biomedical Science, The Korea University, Sejong
- Department of Radiation Oncology, Catholic University Incheon St. Mary's Hospital, Incheon
| | - Tae-Yoon Kim
- Department of Radiation Oncology, Catholic University Incheon St. Mary's Hospital, Incheon
- Department of Radiation Oncology, National Cancer Center, Goyang
| | - Hyung-Jin Yang
- Department of Radiation Oncology, Catholic University Incheon St. Mary's Hospital, Incheon
- Department of Physics, The Korea University, Sejong, Korea
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Performance Evaluation of SimPET-X, a PET Insert for Simultaneous Mouse Total-Body PET/MR Imaging. Mol Imaging Biol 2021; 23:703-713. [PMID: 33768465 DOI: 10.1007/s11307-021-01595-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 01/30/2021] [Accepted: 02/25/2021] [Indexed: 11/27/2022]
Abstract
PURPOSE In this study, a small animal PET insert (SimPET-X, Brightonix Imaging Inc.) for simultaneous PET/MR imaging studies is presented. This insert covers an 11-cm-long axial field-of-view (FOV) and enables imaging of mouse total-bodies and rat heads. PROCEDURES SimPET-X comprises 16 detector modules to yield a ring diameter of 63 mm and an axial FOV of 110 mm. The detector module supports four detector blocks, each comprising two 4 × 4 SiPM arrays coupled with a 20 × 9 array of LSO crystals (1.2 × 1.2 × 10 mm3). The physical characteristics of SimPET-X were measured in accordance with the NEMA NU4-2008 standard protocol. In addition, we assessed the compatibility of SimPET-X with a small animal-dedicated MRI (M7, Aspect Imaging) and conducted phantom and animal studies. RESULTS The radial spatial resolutions at the center based on 3D OSEM without and with the warm background were 0.73 mm and 0.99 mm, respectively. The absolute peak sensitivity of the system was 10.44% with an energy window of 100-900 keV and 8.27% with an energy window of 250-750 keV. The peak NECR and scatter fraction for the mouse phantom were 348 kcps at 26.2 MBq and 22.1% with an energy window of 250-750 keV, respectively. The standard deviation of pixel value in the uniform region of an NEMA IQ phantom was 4.57%. The spillover ratios for air- and water-filled chambers were 9.0% and 11.0%, respectively. In the hot-rod phantom image reconstructed using 3D OSEM-PSF, all small rods were resolved owing to the high spatial resolution of the SimPET-X system. There was no notable interference between SimPET-X and M7 MRI. SimPET-X provided high-quality mouse images with superior spatial resolution, sensitivity, and counting rate performance. CONCLUSION SimPET-X yielded a remarkably improved sensitivity and NECR compared with SimPETTM.
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Lee JS. A Review of Deep-Learning-Based Approaches for Attenuation Correction in Positron Emission Tomography. IEEE TRANSACTIONS ON RADIATION AND PLASMA MEDICAL SCIENCES 2021. [DOI: 10.1109/trpms.2020.3009269] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Yoo J, Lee JM, Yoon JH, Joo I, Lee DH. Additional Value of Integrated 18F-FDG PET/MRI for Evaluating Biliary Tract Cancer: Comparison with Contrast-Enhanced CT. Korean J Radiol 2021; 22:714-724. [PMID: 33660461 PMCID: PMC8076821 DOI: 10.3348/kjr.2020.0689] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 09/24/2020] [Accepted: 10/08/2020] [Indexed: 01/16/2023] Open
Abstract
Objective To evaluate the value of 18F-fluorodeoxyglucose PET/MRI added to contrast-enhanced CT (CECT) in initial staging, assessment of resectability, and postoperative follow-up of biliary tract cancer. Materials and Methods This retrospective study included 100 patients (initial workup [n = 65] and postoperative follow-up [n = 35]) who had undergone PET/MRI and CECT for bile duct or gallbladder lesions between January 2013 and March 2020. Two radiologists independently reviewed the CECT imaging set and CECT plus PET/MRI set to determine the likelihood of malignancy, local and overall resectability, and distant metastasis in the initial workup group, and local recurrence and distant metastasis in the follow-up group. Diagnostic performances of the two imaging sets were compared using clinical-surgical-pathologic findings as standards of reference. Results The diagnostic performance of CECT significantly improved after the addition of PET/MRI for liver metastasis (area under the receiver operating characteristic curve [Az]: 0.77 vs. 0.91 [p = 0.027] for reviewer 1; 0.76 vs. 0.92 [p = 0.021] for reviewer 2), lymph node metastasis (0.73 vs. 0.92 [p = 0.004]; 0.81 vs. 0.92 [p = 0.023]), and overall resectability (0.79 vs. 0.92 [p = 0.007]; 0.82 vs. 0.94 [p = 0.021]) in the initial workup group. In the follow-up group, the diagnostic performance of CECT plus PET/MRI was significantly higher than that of CECT imaging for local recurrence (0.81 vs. 1.00 [p = 0.029]; 0.82 vs. 0.94 [p = 0.045]). Conclusion PET/MRI may add value to CECT in patients with biliary tract cancer both in the initial workup for staging and determination of overall resectability and in follow-up for local recurrence.
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Affiliation(s)
- Jeongin Yoo
- Department of Radiology, Seoul National University Hospital, Seoul, Korea
| | - Jeong Min Lee
- Department of Radiology and Institute of Radiation Medicine, Seoul National University College of Medicine, Seoul, Korea.
| | - Jeong Hee Yoon
- Department of Radiology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
| | - Ijin Joo
- Department of Radiology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
| | - Dong Ho Lee
- Department of Radiology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
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Positron emission tomography/magnetic resonance imaging for the diagnosis and differentiation of pancreatic tumors. Nucl Med Commun 2020; 41:155-161. [PMID: 31834254 DOI: 10.1097/mnm.0000000000001125] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVE This retrospective study aimed to evaluate the diagnostic efficiency of simultaneous positron emission tomography/magnetic resonance imaging (PET/MR) in differentiating the benign and malignant of pancreatic tumors as well as the differentiation of pancreatic cancer. METHODS A total of 62 patients with suspected pancreatic tumors, diagnosed by PET/MR examinations, were collected in this study. These patients were divided into benign group and malignant group. The characteristics of the morphological MR, apparent diffusion coefficient (ADC), the mean of standardized uptake value (SUVmean), maximum values of standardized uptake value (SUVmax), in lesions were measured, and the novel parameters SUVpeak/ADC and SUVmax/ADC were constructed. The diagnostic efficiency for differentiating the benign and malignant lesions was analyzed by receiver operating characteristic (ROC) curve, and the diagnosis efficiency for the differentiation of pancreatic cancer was analyzed by Spearman correlation analysis. RESULTS In differentiating the benign and malignant of pancreatic tumors, the diagnostic efficiency increased in the order of SUVpeak (AUROC: 0.760), SUVmax (AUROC: 0.774), T1T2 (AUROC: 0.789), ADC (AUROC: 0.817), SUVpeak/ADC (AUROC: 0.836), SUVmax/ADC (AUROC: 0.847). There was no significant correlation for SUVmax, SUVpeak, ADC, SUVpeak/ADC, and SUVmax/ADC with the differentiation of pancreatic cancer (P > 0.05). Besides, T1T2 was not significantly correlated to the differentiation of pancreatic cancer (P = 0.026, r = -0.406). CONCLUSION The integration of PET/MR imaging could be used to efficiently diagnose whether the pancreatic tumor was benign or malignant. The SUVmax/ADC was the most efficient metric, while it could not help in the differentiation of pancreatic cancer.
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Xu C, Li X, Shi Y, Wang B, Sun H. Combinative evaluation of primary tumor and lymph nodes to predict pelvic lymphatic metastasis in cervical cancer: an integrated PET-IVIM MRI study. Cancer Imaging 2020; 20:21. [PMID: 32143736 PMCID: PMC7060657 DOI: 10.1186/s40644-020-00298-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Accepted: 02/28/2020] [Indexed: 12/18/2022] Open
Abstract
Background The aim of this study was to evaluate the value of combining pelvic lymph node and tumor characteristics on positron emission tomography-intravoxel incoherent motion magnetic resonance (PET-IVIM MR) imaging for predicting lymph node metastasis in patients with cervical cancer, especially in those with negative lymph nodes on PET. Methods The medical records of 95 patients with cervical cancer who underwent surgical resection with pelvic lymph node dissection were evaluated. The patients were divided into negative and positive groups according to postoperative pathologic lymph node diagnosis, and comparisons of the PET and IVIM-derived parameters between the two groups were performed. Univariate and multivariate analyses were performed to construct a predictive model of lymph node metastasis. Results For all patients, tumor SUVmax, TLG, Dmin, PET and MRI for lymph node diagnosis showed significant differences between patients with and without confirmed lymph node metastasis. Univariate and multivariate logistic analysis showed that the combination of tumor TLG, Dmin and PET for lymph node diagnosis had the strongest predictive value (AUC 0.913, p < 0.001). For patients with PET-negative lymph nodes, SUVmax, SUVmean, MTV, TLG, and Dmin showed significant between-group differences, and univariate and multivariate logistic analysis showed that TLG had the strongest predictive value. Conclusions The combination of tumorTLG, Dmin and PET for lymph node diagnosis is a powerful prognostic factor for all patients. TLG has the best predictive performance in patients with PET negative lymph nodes.
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Affiliation(s)
- Chen Xu
- Department of Radiology, Shengjing Hospital of China Medical University, Sanhao Street No36, Heping District, Shenyang, Liaoning, PR China, 110004.,Liaoning Provincial Key Laboratory of Medical Imaging, Sanhao Street No36, Heping District, Shenyang, 110004, Liaoning, China
| | - Xiaoran Li
- Department of Radiology, Shengjing Hospital of China Medical University, Sanhao Street No36, Heping District, Shenyang, Liaoning, PR China, 110004
| | - Yanchi Shi
- Department of Radiology, Shengjing Hospital of China Medical University, Sanhao Street No36, Heping District, Shenyang, Liaoning, PR China, 110004
| | - Bo Wang
- Department of Radiology, Shengjing Hospital of China Medical University, Sanhao Street No36, Heping District, Shenyang, Liaoning, PR China, 110004
| | - Hongzan Sun
- Department of Radiology, Shengjing Hospital of China Medical University, Sanhao Street No36, Heping District, Shenyang, Liaoning, PR China, 110004. .,Liaoning Provincial Key Laboratory of Medical Imaging, Sanhao Street No36, Heping District, Shenyang, 110004, Liaoning, China.
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14
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Laurent C, Ricard L, Fain O, Buvat I, Adedjouma A, Soussan M, Mekinian A. PET/MRI in large-vessel vasculitis: clinical value for diagnosis and assessment of disease activity. Sci Rep 2019; 9:12388. [PMID: 31455785 PMCID: PMC6711961 DOI: 10.1038/s41598-019-48709-w] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Accepted: 07/23/2019] [Indexed: 12/19/2022] Open
Abstract
Diagnosis of large vessel vasculitis (LVV) and evaluation of its inflammatory activity can be challenging. Our aim was to investigate the value of hybrid positron-emission tomography/magnetic resonance imaging (PET/MRI) in LVV. All consecutive patients with LVV from the Department of Internal Medicine who underwent PET/MRI were included. Three PET/MRI patterns were defined: (i) "inflammatory," with positive PET (>liver uptake) and abnormal MRI (stenosis and/or wall thickening); (ii) "fibrous", negative PET (≤liver uptake) and abnormal MRI; and (iii) "normal". Thirteen patients (10 female; median age: 67-years [range: 23-87]) underwent 18 PET/MRI scans. PET/MRI was performed at diagnosis (n = 4), at relapse (n = 7), or during remission (n = 7). Among the 18 scans, eight (44%) showed an inflammatory pattern and three (17%) a fibrous pattern; the other seven were normal. The distribution of the three patterns did not differ between patients with Takayasu arteritis (TA, n = 10 scans) and those with giant cell arteritis (GCA, n = 8 scans). PET/MRI findings were normal in 2/10 (20%) TA scans vs. 5/8 (62%) GCA scans (p = 0.3). Median SUVmax was 4.7 [2.1-8.6] vs. 2 [1.8-2.6] in patients with active disease vs. remission, respectively (p = 0.003). PET/MRI is a new hybrid imaging modality allowing comprehensive and multimodal analysis of vascular wall inflammation and the vascular lumen. This technique offers promising perspectives for the diagnosis and monitoring of LVV.
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Affiliation(s)
- Charlotte Laurent
- AP-HP, Sorbonne Université, Hôpital Saint-Antoine, Service de Médecine Interne and Inflammation-Immunopathology-Biotherapy Department (DHU i2B), F-75012, Paris, France
| | - Laure Ricard
- AP-HP, Sorbonne Université, Hôpital Saint-Antoine, Service de Médecine Interne and Inflammation-Immunopathology-Biotherapy Department (DHU i2B), F-75012, Paris, France
| | - Olivier Fain
- AP-HP, Sorbonne Université, Hôpital Saint-Antoine, Service de Médecine Interne and Inflammation-Immunopathology-Biotherapy Department (DHU i2B), F-75012, Paris, France
| | - Irene Buvat
- IMIV, CEA, INSERM, Université Paris Sud, CNRS, Université Paris Saclay, Orsay, France
| | - Amir Adedjouma
- AP-HP, Sorbonne Université, Hôpital Saint-Antoine, Service de Médecine Interne and Inflammation-Immunopathology-Biotherapy Department (DHU i2B), F-75012, Paris, France
| | - Michael Soussan
- IMIV, CEA, INSERM, Université Paris Sud, CNRS, Université Paris Saclay, Orsay, France
- APHP, Hôpital Avicenne, Service de Médecine Nucléaire, Paris 13 University, Bobigny, France
| | - Arsène Mekinian
- AP-HP, Sorbonne Université, Hôpital Saint-Antoine, Service de Médecine Interne and Inflammation-Immunopathology-Biotherapy Department (DHU i2B), F-75012, Paris, France.
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15
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Kemeny N, Kurilova I, Li J, Camacho JC, Sofocleous CT. Liver-Directed and Systemic Therapies for Colorectal Cancer Liver Metastases. Cardiovasc Intervent Radiol 2019; 42:1240-1254. [DOI: 10.1007/s00270-019-02284-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Accepted: 07/03/2019] [Indexed: 02/07/2023]
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16
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Hwang D, Kang SK, Kim KY, Seo S, Paeng JC, Lee DS, Lee JS. Generation of PET Attenuation Map for Whole-Body Time-of-Flight 18F-FDG PET/MRI Using a Deep Neural Network Trained with Simultaneously Reconstructed Activity and Attenuation Maps. J Nucl Med 2019; 60:1183-1189. [PMID: 30683763 DOI: 10.2967/jnumed.118.219493] [Citation(s) in RCA: 90] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Accepted: 12/20/2018] [Indexed: 02/06/2023] Open
Abstract
We propose a new deep learning-based approach to provide more accurate whole-body PET/MRI attenuation correction than is possible with the Dixon-based 4-segment method. We use activity and attenuation maps estimated using the maximum-likelihood reconstruction of activity and attenuation (MLAA) algorithm as inputs to a convolutional neural network (CNN) to learn a CT-derived attenuation map. Methods: The whole-body 18F-FDG PET/CT scan data of 100 cancer patients (38 men and 62 women; age, 57.3 ± 14.1 y) were retrospectively used for training and testing the CNN. A modified U-net was trained to predict a CT-derived μ-map (μ-CT) from the MLAA-generated activity distribution (λ-MLAA) and μ-map (μ-MLAA). We used 1.3 million patches derived from 60 patients' data for training the CNN, data of 20 others were used as a validation set to prevent overfitting, and the data of the other 20 were used as a test set for the CNN performance analysis. The attenuation maps generated using the proposed method (μ-CNN), μ-MLAA, and 4-segment method (μ-segment) were compared with the μ-CT, a ground truth. We also compared the voxelwise correlation between the activity images reconstructed using ordered-subset expectation maximization with the μ-maps, and the SUVs of primary and metastatic bone lesions obtained by drawing regions of interest on the activity images. Results: The CNN generates less noisy attenuation maps and achieves better bone identification than MLAA. The average Dice similarity coefficient for bone regions between μ-CNN and μ-CT was 0.77, which was significantly higher than that between μ-MLAA and μ-CT (0.36). Also, the CNN result showed the best pixel-by-pixel correlation with the CT-based results and remarkably reduced differences in activity maps in comparison to CT-based attenuation correction. Conclusion: The proposed deep neural network produced a more reliable attenuation map for 511-keV photons than the 4-segment method currently used in whole-body PET/MRI studies.
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Affiliation(s)
- Donghwi Hwang
- Department of Biomedical Sciences, Seoul National University, Seoul, Korea.,Department of Nuclear Medicine, Seoul National University, Seoul, Korea
| | - Seung Kwan Kang
- Department of Biomedical Sciences, Seoul National University, Seoul, Korea.,Department of Nuclear Medicine, Seoul National University, Seoul, Korea
| | - Kyeong Yun Kim
- Department of Biomedical Sciences, Seoul National University, Seoul, Korea.,Department of Nuclear Medicine, Seoul National University, Seoul, Korea
| | - Seongho Seo
- Department of Neuroscience, College of Medicine, Gachon University, Incheon, Korea
| | - Jin Chul Paeng
- Department of Nuclear Medicine, Seoul National University, Seoul, Korea.,Institute of Radiation Medicine, Medical Research Center, Seoul National University, Seoul, Korea; and
| | - Dong Soo Lee
- Department of Nuclear Medicine, Seoul National University, Seoul, Korea .,Institute of Radiation Medicine, Medical Research Center, Seoul National University, Seoul, Korea; and.,Department of Molecular Medicine and Biopharmaceutical Sciences, Graduate School of Convergence Science and Technology, Seoul National University, Suwon, Korea
| | - Jae Sung Lee
- Department of Biomedical Sciences, Seoul National University, Seoul, Korea .,Department of Nuclear Medicine, Seoul National University, Seoul, Korea.,Institute of Radiation Medicine, Medical Research Center, Seoul National University, Seoul, Korea; and
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Choe YH. A Glimpse on Trends and Characteristics of Recent Articles Published in the Korean Journal of Radiology. Korean J Radiol 2019; 20:1555-1561. [PMID: 31854145 PMCID: PMC6923209 DOI: 10.3348/kjr.2019.0928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- Yeon Hyeon Choe
- Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea; Heart Vascular Stroke Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
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18
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Joo I, Lee JM, Yoon JH. Imaging Diagnosis of Intrahepatic and Perihilar Cholangiocarcinoma: Recent Advances and Challenges. Radiology 2018; 288:7-13. [DOI: 10.1148/radiol.2018171187] [Citation(s) in RCA: 93] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Ijin Joo
- From the Department of Radiology (I.J., J.M.L., J.H.Y.) and Institute of Radiation Medicine (J.M.L.), Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul, 03080, Korea; and Department of Radiology, Seoul National University College of Medicine, Seoul, Korea (I.J., J.M.L., J.H.Y.)
| | - Jeong Min Lee
- From the Department of Radiology (I.J., J.M.L., J.H.Y.) and Institute of Radiation Medicine (J.M.L.), Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul, 03080, Korea; and Department of Radiology, Seoul National University College of Medicine, Seoul, Korea (I.J., J.M.L., J.H.Y.)
| | - Jeong Hee Yoon
- From the Department of Radiology (I.J., J.M.L., J.H.Y.) and Institute of Radiation Medicine (J.M.L.), Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul, 03080, Korea; and Department of Radiology, Seoul National University College of Medicine, Seoul, Korea (I.J., J.M.L., J.H.Y.)
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Abstract
Imaging in heart failure (HF) provides data for diagnosis, prognosis and disease monitoring. Both MRI and nuclear imaging techniques have been successfully used for this purpose in HF. Positron Emission Tomography-Cardiac Magnetic Resonance (PET-CMR) is an example of a new multimodality diagnostic imaging technique with potential applications in HF. The threshold for adopting a new diagnostic tool to clinical practice must necessarily be high, lest they exacerbate costs without improving care. New modalities must demonstrate clinical superiority, or at least equivalence, combined with another important advantage, such as lower cost or improved patient safety. The purpose of this review is to outline the current status of multimodality PET-CMR with regard to HF applications, and determine whether the clinical utility of this new technology justifies the cost.
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Affiliation(s)
- Michael A Quail
- Section of Cardiovascular Medicine, Department of Medicine, Yale University School of Medicine, Dana 3, P.O. Box 208017, New Haven, CT, 06520-8017, USA.,Institute of Cardiovascular Science, University College London, London, UK
| | - Albert J Sinusas
- Section of Cardiovascular Medicine, Department of Medicine, Yale University School of Medicine, Dana 3, P.O. Box 208017, New Haven, CT, 06520-8017, USA. .,Department of Radiology and Biomedical Imaging, Yale University School of Medicine, New Haven, CT, USA.
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20
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Hwang D, Kim KY, Kang SK, Seo S, Paeng JC, Lee DS, Lee JS. Improving the Accuracy of Simultaneously Reconstructed Activity and Attenuation Maps Using Deep Learning. J Nucl Med 2018; 59:1624-1629. [DOI: 10.2967/jnumed.117.202317] [Citation(s) in RCA: 99] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Accepted: 01/25/2018] [Indexed: 12/25/2022] Open
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21
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Ljubimova JY, Sun T, Mashouf L, Ljubimov AV, Israel LL, Ljubimov VA, Falahatian V, Holler E. Covalent nano delivery systems for selective imaging and treatment of brain tumors. Adv Drug Deliv Rev 2017; 113:177-200. [PMID: 28606739 PMCID: PMC5578712 DOI: 10.1016/j.addr.2017.06.002] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 06/07/2017] [Indexed: 02/06/2023]
Abstract
Nanomedicine is a rapidly evolving form of therapy that holds a great promise for superior drug delivery efficiency and therapeutic efficacy than conventional cancer treatment. In this review, we attempt to cover the benefits and the limitations of current nanomedicines with special attention to covalent nano conjugates for imaging and drug delivery in the brain. The improvement in brain tumor treatment remains dismal despite decades of efforts in drug development and patient care. One of the major obstacles in brain cancer treatment is the poor drug delivery efficiency owing to the unique blood-brain barrier (BBB) in the CNS. Although various anti-cancer agents are available to treat tumors outside of the CNS, the majority fails to cross the BBB. In this regard, nanomedicines have increasingly drawn attention due to their multi-functionality and versatility. Nano drugs can penetrate BBB and other biological barriers, and selectively accumulate in tumor cells, while concurrently decreasing systemic toxicity.
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Affiliation(s)
- Julia Y Ljubimova
- Nanomedicine Research Center, Department of Neurosurgery, Cedars-Sinai Medical Center, 8700 Beverly Blvd., AHSP, Los Angeles, CA 90048, USA.
| | - Tao Sun
- Nanomedicine Research Center, Department of Neurosurgery, Cedars-Sinai Medical Center, 8700 Beverly Blvd., AHSP, Los Angeles, CA 90048, USA
| | - Leila Mashouf
- Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA
| | - Alexander V Ljubimov
- Department of Biomedical Sciences, Board of Governors Regenerative Medicine Institute, Los Angeles, CA 90048, USA
| | - Liron L Israel
- Nanomedicine Research Center, Department of Neurosurgery, Cedars-Sinai Medical Center, 8700 Beverly Blvd., AHSP, Los Angeles, CA 90048, USA
| | - Vladimir A Ljubimov
- Department of Neurosurgery and Brain Repair, University of South Florida, 2 Tampa General Circle, Tampa, FL 33606, USA
| | - Vida Falahatian
- Duke University School of Medicine, Department of Biostatistics and Bioinformatics, Clinical Research Training Program (CRTP), 2424 Erwin Road, Suite 1102, Hock Plaza Box 2721, Durham, NC 27710, USA
| | - Eggehard Holler
- Nanomedicine Research Center, Department of Neurosurgery, Cedars-Sinai Medical Center, 8700 Beverly Blvd., AHSP, Los Angeles, CA 90048, USA; Institut für Biophysik und Physikalische Biochemie, Universität Regensburg, D-93040 Regensburg, Germany
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22
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Joo I, Lee JM, Lee DH, Lee ES, Paeng JC, Lee SJ, Jang JY, Kim SW, Ryu JK, Lee KB. Preoperative Assessment of Pancreatic Cancer with FDG PET/MR Imaging versus FDG PET/CT Plus Contrast-enhanced Multidetector CT: A Prospective Preliminary Study. Radiology 2017; 282:149-159. [DOI: 10.1148/radiol.2016152798] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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23
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Jones C, Klein R. Can PET be performed without an attenuation scan? J Nucl Cardiol 2016; 23:1098-1101. [PMID: 26338426 DOI: 10.1007/s12350-015-0266-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Accepted: 08/05/2015] [Indexed: 10/23/2022]
Affiliation(s)
- Colin Jones
- Department of Systems and Computer Engineering, Carleton University, Ottawa, ON, Canada
| | - Ran Klein
- Department of Nuclear Medicine, The Ottawa Hospital, Ottawa, ON, Canada.
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24
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Lee DH, Lee JM, Hur BY, Joo I, Yi NJ, Suh KS, Kang KW, Han JK. Colorectal Cancer Liver Metastases: Diagnostic Performance and Prognostic Value of PET/MR Imaging. Radiology 2016; 280:782-92. [DOI: 10.1148/radiol.2016151975] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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25
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Schwenzer NF, Seith F, Gatidis S, Brendle C, Schmidt H, Pfannenberg CA, laFougère C, Nikolaou K, Schraml C. Diagnosing Lung Nodules on Oncologic MR/PET Imaging: Comparison of Fast T1-Weighted Sequences and Influence of Image Acquisition in Inspiration and Expiration Breath-Hold. Korean J Radiol 2016; 17:684-94. [PMID: 27587957 PMCID: PMC5007395 DOI: 10.3348/kjr.2016.17.5.684] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2015] [Accepted: 04/26/2016] [Indexed: 12/21/2022] Open
Abstract
Objective First, to investigate the diagnostic performance of fast T1-weighted sequences for lung nodule evaluation in oncologic magnetic resonance (MR)/positron emission tomography (PET). Second, to evaluate the influence of image acquisition in inspiration and expiration breath-hold on diagnostic performance. Materials and Methods The study was approved by the local Institutional Review Board. PET/CT and MR/PET of 44 cancer patients were evaluated by 2 readers. PET/CT included lung computed tomography (CT) scans in inspiration and expiration (CTin, CTex). MR/PET included Dixon sequence for attenuation correction and fast T1-weighted volumetric interpolated breath-hold examination (VIBE) sequences (volume interpolated breath-hold examination acquired in inspiration [VIBEin], volume interpolated breath-hold examination acquired in expiration [VIBEex]). Diagnostic performance was analyzed for lesion-, lobe-, and size-dependence. Diagnostic confidence was evaluated (4-point Likert-scale; 1 = high). Jackknife alternative free-response receiver-operating characteristic (JAFROC) analysis was performed. Results Seventy-six pulmonary lesions were evaluated. Lesion-based detection rates were: CTex, 77.6%; VIBEin, 53.3%; VIBEex, 51.3%; and Dixon, 22.4%. Lobe-based detection rates were: CTex, 89.6%; VIBEin, 58.3%; VIBEex, 60.4%; and Dixon, 31.3%. In contrast to CT, inspiration versus expiration did not alter diagnostic performance in VIBE sequences. Diagnostic confidence was best for VIBEin and CTex and decreased in VIBEex and Dixon (1.2 ± 0.6; 1.2 ± 0.7; 1.5 ± 0.9; 1.7 ± 1.1, respectively). The JAFROC figure-of-merit of Dixon was significantly lower. All patients with malignant lesions were identified by CTex, VIBEin, and VIBEex, while 3 patients were false-negative in Dixon. Conclusion Fast T1-weighted VIBE sequences allow for identification of patients with malignant pulmonary lesions. The Dixon sequence is not recommended for lung nodule evaluation in oncologic MR/PET patients. In contrast to CT, inspiration versus expiratory breath-hold in VIBE sequences was less crucial for lung nodule evaluation but was important for diagnostic confidence.
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Affiliation(s)
- Nina F Schwenzer
- Department of Diagnostic and Interventional Radiology, University Hospital of Tuebingen, Tuebingen 72076, Germany
| | - Ferdinand Seith
- Department of Diagnostic and Interventional Radiology, University Hospital of Tuebingen, Tuebingen 72076, Germany
| | - Sergios Gatidis
- Department of Diagnostic and Interventional Radiology, University Hospital of Tuebingen, Tuebingen 72076, Germany
| | - Cornelia Brendle
- Department of Diagnostic and Interventional Radiology, University Hospital of Tuebingen, Tuebingen 72076, Germany.; Department of Diagnostic and Interventional Neuroradiology, University Hospital of Tuebingen, Tuebingen 72076, Germany
| | - Holger Schmidt
- Department of Diagnostic and Interventional Radiology, University Hospital of Tuebingen, Tuebingen 72076, Germany
| | - Christina A Pfannenberg
- Department of Diagnostic and Interventional Radiology, University Hospital of Tuebingen, Tuebingen 72076, Germany
| | - Christian laFougère
- Department of Nuclear Medicine, University Hospital of Tuebingen, Tuebingen 72076, Germany
| | - Konstantin Nikolaou
- Department of Diagnostic and Interventional Radiology, University Hospital of Tuebingen, Tuebingen 72076, Germany
| | - Christina Schraml
- Department of Diagnostic and Interventional Radiology, University Hospital of Tuebingen, Tuebingen 72076, Germany
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26
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Menezes ME, Das SK, Minn I, Emdad L, Wang XY, Sarkar D, Pomper MG, Fisher PB. Detecting Tumor Metastases: The Road to Therapy Starts Here. Adv Cancer Res 2016; 132:1-44. [PMID: 27613128 DOI: 10.1016/bs.acr.2016.07.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Metastasis is the complex process by which primary tumor cells migrate and establish secondary tumors in an adjacent or distant location in the body. Early detection of metastatic disease and effective therapeutic options for targeting these detected metastases remain impediments to effectively treating patients with advanced cancers. If metastatic lesions are identified early, patients might maximally benefit from effective early therapeutic interventions. Further, monitoring patients whose primary tumors are effectively treated for potential metastatic disease onset is also highly valuable. Finally, patients with metastatic disease can be monitored for efficacy of specific therapeutic interventions through effective metastatic detection techniques. Thus, being able to detect and visualize metastatic lesions is key and provides potential to greatly improve overall patient outcomes. In order to achieve these objectives, researchers have endeavored to mechanistically define the steps involved in the metastatic process as well as ways to effectively detect metastatic progression. We presently overview various preclinical and clinical in vitro and in vivo assays developed to more efficiently detect tumor metastases, which provides the foundation for developing more effective therapies for this invariably fatal component of the cancerous process.
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Affiliation(s)
- M E Menezes
- Virginia Commonwealth University, School of Medicine, Richmond, VA, United States
| | - S K Das
- Virginia Commonwealth University, School of Medicine, Richmond, VA, United States; VCU Institute of Molecular Medicine, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States; VCU Massey Cancer Center, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States
| | - I Minn
- The Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - L Emdad
- Virginia Commonwealth University, School of Medicine, Richmond, VA, United States; VCU Institute of Molecular Medicine, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States; VCU Massey Cancer Center, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States
| | - X-Y Wang
- Virginia Commonwealth University, School of Medicine, Richmond, VA, United States; VCU Institute of Molecular Medicine, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States; VCU Massey Cancer Center, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States
| | - D Sarkar
- Virginia Commonwealth University, School of Medicine, Richmond, VA, United States; VCU Institute of Molecular Medicine, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States; VCU Massey Cancer Center, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States
| | - M G Pomper
- The Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - P B Fisher
- Virginia Commonwealth University, School of Medicine, Richmond, VA, United States; VCU Institute of Molecular Medicine, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States; VCU Massey Cancer Center, Virginia Commonwealth University, School of Medicine, Richmond, VA, United States.
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Abstract
PET/computed tomography (PET/CT) is an established hybrid imaging technique for staging and follow-up of gastrointestinal (GI) tract malignancies, especially for colorectal carcinoma. Dedicated hybrid PET/MR imaging scanners are currently available for clinical use. Although they will not replace regular use of PET/CT, they may have utility in selected cases of GI tract malignancies. The superior soft tissue contrast resolution and depiction of anatomy and the functional information obtained from diffusion-weighted imaging (DWI) provided by MR imaging in PET/MR imaging are advantages over CT of PET/CT for T staging and follow-up of rectal carcinoma and for better characterization of liver lesions. Functional information from DWI and use of liver-specific MR imaging contrast agents are an added advantage in follow-up of liver metastases after systemic and locoregional treatment. New radiotracers will improve the utility of PET/MR imaging in staging and follow-up of tumors, which may not be [18F]-2-fluoro-2-deoxy-d-glucose avid, such as hepatocellular carcinoma and neuroendocrine tumors. PET/MR imaging also has application in selected cases of cholangiocarcinoma, gallbladder cancer, and pancreatic carcinoma for initial staging and follow-up assessment.
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Affiliation(s)
- Raj Mohan Paspulati
- Division of Abdominal Imaging, Department of Radiology, University Hospitals Case Western Reserve University, 11100 Euclid Avenue, Cleveland, OH 44106, USA.
| | - Amit Gupta
- Department of Radiology, University Hospitals Case Western Reserve University, 11100 Euclid Avenue, Cleveland, OH 44106, USA
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Magnetic Resonance Imaging (MRI) and Positron Emission Tomography (PET)/MRI for Lung Cancer Staging. J Thorac Imaging 2016; 31:215-27. [DOI: 10.1097/rti.0000000000000210] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Milks KS, McLean TW, Anthony EY. Imaging of primary pediatric lymphoma of bone. Pediatr Radiol 2016; 46:1150-7. [PMID: 27043729 DOI: 10.1007/s00247-016-3597-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2015] [Revised: 01/22/2016] [Accepted: 02/25/2016] [Indexed: 12/19/2022]
Abstract
BACKGROUND Primary pediatric bone lymphoma is a rare form of non-Hodgkin lymphoma. Unlike nodal forms of lymphoma, imaging abnormalities in lymphoma of bone do not resolve rapidly in conjunction with treatment and radiologic findings can remain abnormal for years, making it difficult to evaluate treatment response. OBJECTIVE To evaluate the utility of imaging in assessment of patients with primary pediatric bone lymphoma. MATERIALS AND METHODS At our institution between 2004 and 2013, six cases of pathology-proven primary pediatric bone lymphoma were diagnosed. Retrospective chart review was performed to assess imaging utilization. Our data were qualitatively compared with existing literature to construct an algorithm for imaging patients with primary lymphoma of bone. RESULTS Imaging evaluation of patients with primary pediatric bone lymphoma was highly variable at our institution. Conventional imaging was routinely used to evaluate response to treatment, despite lack of appreciable osseous change. Imaging in the absence of symptoms did not alter clinical management. Only positron emission tomography CT (PET/CT) proved capable of demonstrating imaging changes from the pretreatment to the post-treatment scans that were consistent with the clinical response to treatment. CONCLUSION Surveillance imaging is likely unnecessary in patients with a known diagnosis of pediatric lymphoma of bone. Pretreatment and post-treatment PET/CT is likely sufficient to assess response. There is little data to support the use of interim and surveillance PET/CT.
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Affiliation(s)
- Kathryn S Milks
- Department of Pediatric Radiology, Nationwide Children's Hospital, 700 Children's Drive, Columbus, OH, 43205, USA.
| | - Thomas W McLean
- Department of Pediatric Hematology Oncology, Wake Forest Baptist Medical Center, Winston-Salem, NC, USA
| | - Evelyn Y Anthony
- Department of Radiology, Wake Forest Baptist Medical Center, Winston-Salem, NC, USA
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Lee DH, Lee JM. Whole-body PET/MRI for colorectal cancer staging: Is it the way forward? J Magn Reson Imaging 2016; 45:21-35. [DOI: 10.1002/jmri.25337] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Accepted: 05/24/2016] [Indexed: 12/22/2022] Open
Affiliation(s)
- Dong Ho Lee
- Department of Radiology; Seoul National University Hospital; Seoul Korea
- Seoul National University College of Medicine; Seoul Korea
| | - Jeong Min Lee
- Department of Radiology; Seoul National University Hospital; Seoul Korea
- Seoul National University College of Medicine; Seoul Korea
- Institute of Radiation Medicine; Seoul National University Medical Research Center; Seoul Korea
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Lee DH, Kim SH, Joo I, Hur BY, Han JK. Comparison between 18F-FDG PET/MRI and MDCT for the assessment of preoperative staging and resectability of gastric cancer. Eur J Radiol 2016; 85:1085-91. [DOI: 10.1016/j.ejrad.2016.03.015] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2016] [Revised: 03/17/2016] [Accepted: 03/18/2016] [Indexed: 12/19/2022]
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An HJ, Seo S, Kang H, Choi H, Cheon GJ, Kim HJ, Lee DS, Song IC, Kim YK, Lee JS. MRI-Based Attenuation Correction for PET/MRI Using Multiphase Level-Set Method. J Nucl Med 2015; 57:587-93. [PMID: 26697962 DOI: 10.2967/jnumed.115.163550] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Accepted: 11/25/2015] [Indexed: 11/16/2022] Open
Affiliation(s)
- Hyun Joon An
- Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, Korea Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea
| | - Seongho Seo
- Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, Korea Department of Brain and Cognitive Sciences, Seoul National University College of Natural Sciences, Seoul, Korea
| | - Hyejin Kang
- Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, Korea
| | - Hongyoon Choi
- Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, Korea
| | - Gi Jeong Cheon
- Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, Korea Institute of Radiation Medicine, Medical Research Center, Seoul National University College of Medicine, Seoul, Korea
| | - Han-Joon Kim
- Department of Neurology, Seoul National University College of Natural Sciences, Seoul, Korea
| | - Dong Soo Lee
- Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, Korea Institute of Radiation Medicine, Medical Research Center, Seoul National University College of Medicine, Seoul, Korea Department of Molecular Medicine and Biopharmaceutical Sciences, Graduate School of Convergence Science and Technology, Seoul National University, Suwon, Korea
| | - In Chan Song
- Department of Radiology, Seoul National University College of Medicine, Seoul, Korea; and
| | - Yu Kyeong Kim
- Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, Korea Department of Nuclear Medicine, Seoul Metropolitan Government Boramae Medical Center, Seoul, Korea
| | - Jae Sung Lee
- Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, Korea Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea Department of Brain and Cognitive Sciences, Seoul National University College of Natural Sciences, Seoul, Korea Institute of Radiation Medicine, Medical Research Center, Seoul National University College of Medicine, Seoul, Korea
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Crönlein M, Rauscher I, Beer AJ, Schwaiger M, Schäffeler C, Beirer M, Huber S, Sandmann GH, Biberthaler P, Eiber M, Kirchhoff C. Visualization of stress fractures of the foot using PET-MRI: a feasibility study. Eur J Med Res 2015; 20:99. [PMID: 26699121 PMCID: PMC4690332 DOI: 10.1186/s40001-015-0193-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Accepted: 12/17/2015] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND Diagnosis and treatment of stress fractures still remains to be a clinical and radiological challenge. Therapeutic options vary from conservative treatment to surgical treatment without a clear treatment concept. Recently the combination of PET and MRI has been introduced, aiming a superior diagnostic accuracy in clinical practice. Therefore the aim of our study was to analyse whether PET-MRI would be a feasible technique to recognize stress fractures of the foot and to analyse if our conservative treatment plan leads to a good clinical outcome. METHODS Therefore, 20 patients with suspected stress fractures of the foot and ankle underwent plain radiography and (18)F-Fluoride PET-MRI. Two blinded readers assessed in consensus both imaging techniques for the presence of stress fracture, stress reaction or osteoarthritis. Patients with stress fractures or stress reactions in the foot and ankle area underwent our conservative treatment plan, with immobilization in a VACO®ped cast for 6 weeks under partial weight bearing on forearm crutches. The benefit of our conservative therapeutic concept was evaluated by the patients on the basis of VAS and FAOS scoring systems before and after treatment. RESULTS 8 out of 20 patients underwent conservative treatment after diagnosis of either a stress fracture or a stress reaction of the foot and ankle area. PET-MRI identified four stress fractures and seven stress reactions. In all cases, no pathological findings were present on plain X-ray. FAOS and VAS significantly improved according to the patients' records. CONCLUSIONS PET-MRI seems to be a useful modality to diagnose stress fractures and stress reactions of the foot and ankle area, especially when conventional modalities, such as plain radiographs fail. Conservative management is a promising therapeutic option for the treatment of stress fractures. To rule out the benefits compared to a surgical treatment plan, further studies are needed.
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Affiliation(s)
- Moritz Crönlein
- Department of Trauma Surgery, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Strasse 22, 81675, Munich, Germany.
| | - Isabel Rauscher
- Department of Nuclear Medicine, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Strasse 22, 81675, Munich, Germany.
| | - Ambros J Beer
- Department of Nuclear Medicine, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Strasse 22, 81675, Munich, Germany. .,Department of Nuclear Medicine, University Hospital Ulm, Albert-Einstein-Allee 23, 89081, Ulm, Germany.
| | - Markus Schwaiger
- Department of Nuclear Medicine, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Strasse 22, 81675, Munich, Germany.
| | - Christoph Schäffeler
- Musculoskeletal Imaging Department of Radiology, Kantonsspital Graubünden, Loëstrasse 170, 7000, Chur, Switzerland. .,Department of Radiology, Klinikum rechts der Isar, Technische Universität München, Ismaninger Str. 22, 81675, Munich, Germany.
| | - Marc Beirer
- Department of Trauma Surgery, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Strasse 22, 81675, Munich, Germany.
| | - Stephan Huber
- Department of Trauma Surgery, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Strasse 22, 81675, Munich, Germany.
| | - Gunther H Sandmann
- Department of Trauma Surgery, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Strasse 22, 81675, Munich, Germany. .,Clinic for Trauma and Reconstructive Surgery, BGU Tübingen, Schnarrenbergstraße 95, 72076, Tübingen, Germany.
| | - Peter Biberthaler
- Department of Trauma Surgery, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Strasse 22, 81675, Munich, Germany.
| | - Matthias Eiber
- Department of Nuclear Medicine, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Strasse 22, 81675, Munich, Germany.
| | - Chlodwig Kirchhoff
- Department of Trauma Surgery, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Strasse 22, 81675, Munich, Germany.
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Goo HW. Whole-Body MRI in Children: Current Imaging Techniques and Clinical Applications. Korean J Radiol 2015; 16:973-85. [PMID: 26355493 PMCID: PMC4559794 DOI: 10.3348/kjr.2015.16.5.973] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2015] [Accepted: 05/19/2015] [Indexed: 11/22/2022] Open
Abstract
Whole-body magnetic resonance imaging (MRI) is increasingly used in children to evaluate the extent and distribution of various neoplastic and non-neoplastic diseases. Not using ionizing radiation is a major advantage of pediatric whole-body MRI. Coronal and sagittal short tau inversion recovery imaging is most commonly used as the fundamental whole-body MRI protocol. Diffusion-weighted imaging and Dixon-based imaging, which has been recently incorporated into whole-body MRI, are promising pulse sequences, particularly for pediatric oncology. Other pulse sequences may be added to increase diagnostic capability of whole-body MRI. Of importance, the overall whole-body MRI examination time should be less than 30-60 minutes in children, regardless of the imaging protocol. Established and potentially useful clinical applications of pediatric whole-body MRI are described.
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Affiliation(s)
- Hyun Woo Goo
- Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul 05505, Korea
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