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Woods K, Shen ZL, Xu Z, Zhang H, Natsuaki Y, Cheng K, Li V, Kim N, Ma L, Chang E. Hippocampal sparing radiation therapy for brain metastases: treatment techniques and clinical implementation. Chin Clin Oncol 2023; 12:56. [PMID: 37964545 DOI: 10.21037/cco-23-73] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 10/17/2023] [Indexed: 11/16/2023]
Abstract
High doses of radiation to the hippocampus have been correlated with increased cognitive decline following radiation therapy for brain metastases. To mitigate these effects, a variety of hippocampal sparing techniques have been implemented for both whole brain radiation therapy (WBRT) and stereotactic radiosurgery (SRS). The goal of this review article is to provide a practical resource for the clinical implementation of hippocampal-sparing radiation therapy, starting with a brief background on the function and delineation of the hippocampal structure, as well as radiation effects on the hippocampus and the most widely recommended dose constraints. Considerations for treatment simulation are discussed, including options for cranial immobilization and optional head tilt. Hippocampal sparing has been demonstrated for WBRT using helical TomoTherapy, static intensity-modulated radiation therapy (IMRT), and volumetric-modulated arc therapy (VMAT) with a variety of patient setup positions, beam arrangements, and planning parameters. Tomotherapy has been shown to achieve slightly greater hippocampal sparing in some studies, while VMAT enables the most efficient treatment delivery. Hippocampal sparing has also been evaluated in a wide range of studies for both GammaKnife and linear accelerator (LINAC)-based SRS, with the proximity of metastases to the hippocampus being the most significant predictor of hippocampal dose. The methods and resulting hippocampal doses from these studies on both WBRT and SRS are discussed, as well as the role of automation in hippocampal sparing radiation therapy.
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Affiliation(s)
- Kaley Woods
- Department of Radiation Oncology, Keck School of Medicine of USC, Los Angeles, CA, USA
| | - Zhilei Liu Shen
- Department of Radiation Oncology, Keck School of Medicine of USC, Los Angeles, CA, USA
| | - Zhengzheng Xu
- Department of Radiation Oncology, Keck School of Medicine of USC, Los Angeles, CA, USA
| | - Hualin Zhang
- Department of Radiation Oncology, Keck School of Medicine of USC, Los Angeles, CA, USA
| | - Yutaka Natsuaki
- Department of Radiation Oncology, Keck School of Medicine of USC, Los Angeles, CA, USA
| | - Karen Cheng
- Department of Radiation Oncology, Keck School of Medicine of USC, Los Angeles, CA, USA
| | - Vivian Li
- Department of Radiation Oncology, Keck School of Medicine of USC, Los Angeles, CA, USA
| | - Nathan Kim
- Department of Radiation Oncology, Keck School of Medicine of USC, Los Angeles, CA, USA
| | - Lijun Ma
- Department of Radiation Oncology, Keck School of Medicine of USC, Los Angeles, CA, USA
| | - Eric Chang
- Department of Radiation Oncology, Keck School of Medicine of USC, Los Angeles, CA, USA
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Rajagopal A, Natsuaki Y, Wangerin K, Hamdi M, An H, Sunderland JJ, Laforest R, Kinahan PE, Larson PEZ, Hope TA. Synthetic PET via Domain Translation of 3-D MRI. IEEE Trans Radiat Plasma Med Sci 2023; 7:333-343. [PMID: 37396797 PMCID: PMC10311993 DOI: 10.1109/trpms.2022.3223275] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/12/2023]
Abstract
Historically, patient datasets have been used to develop and validate various reconstruction algorithms for PET/MRI and PET/CT. To enable such algorithm development, without the need for acquiring hundreds of patient exams, in this article we demonstrate a deep learning technique to generate synthetic but realistic whole-body PET sinograms from abundantly available whole-body MRI. Specifically, we use a dataset of 56 18F-FDG-PET/MRI exams to train a 3-D residual UNet to predict physiologic PET uptake from whole-body T1-weighted MRI. In training, we implemented a balanced loss function to generate realistic uptake across a large dynamic range and computed losses along tomographic lines of response to mimic the PET acquisition. The predicted PET images are forward projected to produce synthetic PET (sPET) time-of-flight (ToF) sinograms that can be used with vendor-provided PET reconstruction algorithms, including using CT-based attenuation correction (CTAC) and MR-based attenuation correction (MRAC). The resulting synthetic data recapitulates physiologic 18F-FDG uptake, e.g., high uptake localized to the brain and bladder, as well as uptake in liver, kidneys, heart, and muscle. To simulate abnormalities with high uptake, we also insert synthetic lesions. We demonstrate that this sPET data can be used interchangeably with real PET data for the PET quantification task of comparing CTAC and MRAC methods, achieving ≤ 7.6% error in mean-SUV compared to using real data. These results together show that the proposed sPET data pipeline can be reasonably used for development, evaluation, and validation of PET/MRI reconstruction methods.
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Affiliation(s)
- Abhejit Rajagopal
- Department of Radiology and Biomedical Imaging, University of California at San Francisco, San Francisco, CA 94158 USA
| | - Yutaka Natsuaki
- Department of Radiation Oncology, University of New Mexico, Albuquerque, NM 87131 USA
| | | | - Mahdjoub Hamdi
- Department of Radiology, Washington University in St. Louis, St. Louis, MO 63130 USA
| | - Hongyu An
- Department of Radiology, Washington University in St. Louis, St. Louis, MO 63130 USA
| | - John J Sunderland
- Department of Radiology, The University of Iowa, Iowa City, IA 52242 USA
| | - Richard Laforest
- Department of Radiology, Washington University in St. Louis, St. Louis, MO 63130 USA
| | - Paul E Kinahan
- Department of Radiology, University of Washington, Seattle, WA 98195 USA
| | - Peder E Z Larson
- Department of Radiology and Biomedical Imaging, University of California at San Francisco, San Francisco, CA 94158 USA
| | - Thomas A Hope
- Department of Radiology and Biomedical Imaging, University of California at San Francisco, San Francisco, CA 94158 USA
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Laforest R, Khalighi M, Natsuaki Y, Rajagopal A, Chandramohan D, Byrd D, An H, Larson P, James SS, Sunderland JJ, Kinahan PE, Hope TA. Harmonization of PET image reconstruction parameters in simultaneous PET/MRI. EJNMMI Phys 2021; 8:75. [PMID: 34739621 PMCID: PMC8571452 DOI: 10.1186/s40658-021-00416-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Accepted: 10/01/2021] [Indexed: 01/17/2023] Open
Abstract
Objective Simultaneous PET/MRIs vary in their quantitative PET performance due to inherent differences in the physical systems and differences in the image reconstruction implementation. This variability in quantitative accuracy confounds the ability to meaningfully combine and compare data across scanners. In this work, we define image reconstruction parameters that lead to comparable contrast recovery curves across simultaneous PET/MRI systems. Method The NEMA NU-2 image quality phantom was imaged on one GE Signa and on one Siemens mMR PET/MRI scanner. The phantom was imaged at 9.7:1 contrast with standard spheres (diameter 10, 13, 17, 22, 28, 37 mm) and with custom spheres (diameter: 8.5, 11.5, 15, 25, 32.5, 44 mm) using a standardized methodology. Analysis was performed on a 30 min listmode data acquisition and on 6 realizations of 5 min from the listmode data. Images were reconstructed with the manufacturer provided iterative image reconstruction algorithms with and without point spread function (PSF) modeling. For both scanners, a post-reconstruction Gaussian filter of 3–7 mm in steps of 1 mm was applied. Attenuation correction was provided from a scaled computed tomography (CT) image of the phantom registered to the MR-based attenuation images and verified to align on the non-attenuation corrected PET images. For each of these image reconstruction parameter sets, contrast recovery coefficients (CRCs) were determined for the SUVmean, SUVmax and SUVpeak for each sphere. A hybrid metric combining the root-mean-squared discrepancy (RMSD) and the absolute CRC values was used to simultaneously optimize for best match in CRC between the two scanners while simultaneously weighting toward higher resolution reconstructions. The image reconstruction parameter set was identified as the best candidate reconstruction for each vendor for harmonized PET image reconstruction. Results The range of clinically relevant image reconstruction parameters demonstrated widely different quantitative performance across cameras. The best match of CRC curves was obtained at the lowest RMSD values with: for CRCmean, 2 iterations-7 mm filter on the GE Signa and 4 iterations-6 mm filter on the Siemens mMR, for CRCmax, 4 iterations-6 mm filter on the GE Signa, 4 iterations-5 mm filter on the Siemens mMR and for CRCpeak, 4 iterations-7 mm filter with PSF on the GE Signa and 4 iterations-7 mm filter on the Siemens mMR. Over all reconstructions, the RMSD between CRCs was 1.8%, 3.6% and 2.9% for CRC mean, max and peak, respectively. The solution of 2 iterations-3 mm on the GE Signa and 4 iterations-3 mm on Siemens mMR, both with PSF, led to simultaneous harmonization and with high CRC and low RMSD for CRC mean, max and peak with RMSD values of 2.8%, 5.8% and 3.2%, respectively. Conclusions For two commercially available PET/MRI scanners, user-selectable parameters that control iterative updates, image smoothing and PSF modeling provide a range of contrast recovery curves that allow harmonization in harmonization strategies of optimal match in CRC or high CRC values. This work demonstrates that nearly identical CRC curves can be obtained on different commercially available scanners by selecting appropriate image reconstruction parameters. Supplementary Information The online version contains supplementary material available at 10.1186/s40658-021-00416-0.
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Affiliation(s)
- Richard Laforest
- Mallinckrodt Institute of Radiology, Washington University, St. Louis, MO, USA.
| | - Mehdi Khalighi
- Department of Radiology, Stanford University, Stanford, CA, USA
| | - Yutaka Natsuaki
- Department of Radiation Oncology, University of California San Francisco, San Francisco, CA, USA
| | - Abhejit Rajagopal
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, USA
| | - Dharshan Chandramohan
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, USA
| | | | - Hongyu An
- Mallinckrodt Institute of Radiology, Washington University, St. Louis, MO, USA
| | - Peder Larson
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, USA
| | - Sara St James
- Department of Radiation Oncology, University of California San Francisco, San Francisco, CA, USA
| | | | | | - Thomas A Hope
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, USA
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Hamdi M, Natsuaki Y, Wangerin KA, An H, St James S, Kinahan PE, Sunderland JJ, Larson PEZ, Hope TA, Laforest R. Evaluation of attenuation correction in PET/MRI with synthetic lesion insertion. J Med Imaging (Bellingham) 2021; 8:056001. [PMID: 34568511 DOI: 10.1117/1.jmi.8.5.056001] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Accepted: 09/02/2021] [Indexed: 11/14/2022] Open
Abstract
Purpose: One major challenge facing simultaneous positron emission tomography (PET)/ magnetic resonance imaging (MRI) is PET attenuation correction (AC) measurement and evaluation of its accuracy. There is a crucial need for the evaluation of current and emergent PET AC methodologies in terms of absolute quantitative accuracy in the reconstructed PET images. Approach: To address this need, we developed and evaluated a lesion insertion tool for PET/MRI that will facilitate this evaluation process. This tool was developed for the Biograph mMR and evaluated using phantom and patient data. Contrast recovery coefficients (CRC) from the NEMA IEC phantom of synthesized lesions were compared to measurements. In addition, SUV biases of lesions inserted in human brain and pelvis images were assessed from PET images reconstructed with MRI-based AC (MRAC) and CT-based AC (CTAC). Results: For cross-comparison PET/MRI scanners AC evaluation, we demonstrated that the developed lesion insertion tool can be harmonized with the GE-SIGNA lesion insertion tool. About < 3 % CRC curves difference between simulation and measurement was achieved. An average of 1.6% between harmonized simulated CRC curves obtained with mMR and SIGNA lesion insertion tools was achieved. A range of - 5 % to 12% MRAC to CTAC SUV bias was respectively achieved in the vicinity and inside bone tissues in patient images in two anatomical regions, the brain, and pelvis. Conclusions: A lesion insertion tool was developed for the Biograph mMR PET/MRI scanner and harmonized with the SIGNA PET/MRI lesion insertion tool. These tools will allow for an accurate evaluation of different PET/MRI AC approaches and permit exploration of subtle attenuation correction differences across systems.
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Affiliation(s)
- Mahdjoub Hamdi
- Washington University in St. Louis, Mallinckrodt Institute of Radiology, St. Louis, Missouri, United States
| | - Yutaka Natsuaki
- University of California San Francisco, Department of Radiation Oncology, San Francisco, California, United States
| | | | - Hongyu An
- Washington University in St. Louis, Mallinckrodt Institute of Radiology, St. Louis, Missouri, United States
| | - Sarah St James
- University of California San Francisco, Department of Radiation Oncology, San Francisco, California, United States
| | - Paul E Kinahan
- University of Washington Seattle, Seattle, Washington, United States
| | - John J Sunderland
- University of Iowa, Carver College of Medicine, Department of Radiology, Iowa City, Iowa, United States
| | - Peder E Z Larson
- University of California San Francisco, Department of Radiology and Biomedical Imaging, San Francisco, California, United States
| | - Thomas A Hope
- University of California San Francisco, Department of Radiology and Biomedical Imaging, San Francisco, California, United States
| | - Richard Laforest
- Washington University in St. Louis, Mallinckrodt Institute of Radiology, St. Louis, Missouri, United States
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5
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Li X, Qian H, Natsuaki Y, Koga H, Kawakami T, Tateishi C, Tsuruta D, Ishii N, Hashimoto T. Clinical and immunological findings in 55 patients with anti-laminin 332-type mucous membrane pemphigoid. Br J Dermatol 2021; 185:449-451. [PMID: 33811327 DOI: 10.1111/bjd.20099] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 03/30/2021] [Accepted: 03/31/2021] [Indexed: 11/26/2022]
Affiliation(s)
- X Li
- Department of Dermatology, Kurume University School of Medicine, and Kurume University Institute of Cutaneous Cell Biology, Kurume, Fukuoka, Japan.,Central Laboratory, Dermatology Hospital of Jiangxi Province, Dermatology Institute of Jiangxi Province, and the Affiliated Dermatology Hospital of Nanchang University, Nanchang, 330001, China
| | - H Qian
- Department of Dermatology, Kurume University School of Medicine, and Kurume University Institute of Cutaneous Cell Biology, Kurume, Fukuoka, Japan.,Central Laboratory, Dermatology Hospital of Jiangxi Province, Dermatology Institute of Jiangxi Province, and the Affiliated Dermatology Hospital of Nanchang University, Nanchang, 330001, China
| | - Y Natsuaki
- Department of Dermatology, Kurume University School of Medicine, and Kurume University Institute of Cutaneous Cell Biology, Kurume, Fukuoka, Japan
| | - H Koga
- Department of Dermatology, Kurume University School of Medicine, and Kurume University Institute of Cutaneous Cell Biology, Kurume, Fukuoka, Japan
| | - T Kawakami
- Department of Dermatology, Tohoku Medical and Pharmaceutical University, Sendai, Miyagi, Japan
| | - C Tateishi
- Department of Dermatology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - D Tsuruta
- Department of Dermatology, Kurume University School of Medicine, and Kurume University Institute of Cutaneous Cell Biology, Kurume, Fukuoka, Japan.,Department of Dermatology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - N Ishii
- Department of Dermatology, Kurume University School of Medicine, and Kurume University Institute of Cutaneous Cell Biology, Kurume, Fukuoka, Japan
| | - T Hashimoto
- Department of Dermatology, Kurume University School of Medicine, and Kurume University Institute of Cutaneous Cell Biology, Kurume, Fukuoka, Japan.,Department of Dermatology, Osaka City University Graduate School of Medicine, Osaka, Japan
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6
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Hasse K, Scholey J, Ziemer BP, Natsuaki Y, Morin O, Solberg TD, Hirata E, Valdes G, Witztum A. Use of Receiver Operating Curve Analysis and Machine Learning With an Independent Dose Calculation System Reduces the Number of Physical Dose Measurements Required for Patient-Specific Quality Assurance. Int J Radiat Oncol Biol Phys 2021; 109:1086-1095. [PMID: 33197530 DOI: 10.1016/j.ijrobp.2020.10.035] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 10/23/2020] [Accepted: 10/27/2020] [Indexed: 01/21/2023]
Abstract
PURPOSE Our purpose was to assess the use of machine learning methods and Mobius 3D (M3D) dose calculation software to reduce the number of physical ion chamber (IC) dose measurements required for patient-specific quality assurance during corona virus disease 2019. METHODS AND MATERIALS In this study, 1464 inversely planned treatments using Pinnacle or Raystation treatment planning software (TPS) were delivered using Elekta Versa HD and Varian Truebeam and Truebeam STx linear accelerators between June 2018 and November 2019. For each plan, an independent dose calculation was performed using M3D, and an absolute dose measurement was taken using a Pinpoint IC inside the Mobius phantom. The point dose differences between the TPS and M3D calculation and between TPS and IC measurements were calculated. Agreement between the TPS and IC was used to define the ground truth plan failure. To reduce the on-site personnel during the pandemic, 2 methods of receiver operating characteristic analysis (n = 1464) and machine learning (n = 603) were used to identify patient plans that would require physical dose measurements. RESULTS In the receiver operating characteristic analysis, a predelivery M3D difference threshold of 3% identified plans that failed an IC measurement at a 4% threshold with 100% sensitivity and 76.3% specificity. This indicates that fewer than 25% of plans required a physical dose measurement. A threshold of 1% on a machine learning model was able to identify plans that failed an IC measurement at a 3% threshold with 100% sensitivity and 54.3% specificity, leading to fewer than 50% of plans that required a physical dose measurement. CONCLUSIONS It is possible to identify plans that are more likely to fail IC patient-specific quality assurance measurements before delivery. This possibly allows for a reduction of physical measurements taken, freeing up significant clinical resources and reducing the required amount of on-site personnel while maintaining patient safety.
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Affiliation(s)
- K Hasse
- Department of Radiation Oncology, University of California, San Francisco, California.
| | - J Scholey
- Department of Radiation Oncology, University of California, San Francisco, California
| | - B P Ziemer
- Department of Radiation Oncology, University of California, San Francisco, California
| | - Y Natsuaki
- Department of Radiation Oncology, University of California, San Francisco, California
| | - O Morin
- Department of Radiation Oncology, University of California, San Francisco, California
| | | | - E Hirata
- Department of Radiation Oncology, University of California, San Francisco, California
| | - G Valdes
- Department of Radiation Oncology, University of California, San Francisco, California
| | - A Witztum
- Department of Radiation Oncology, University of California, San Francisco, California
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7
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Witztum A, Ziemer B, Hasse K, Natsuaki Y, Valdes G, Hirata E, Solberg T, Scholey J. PO-1362: Experience with an independent patient QA dose calculation system in multi-linac and TPS environment. Radiother Oncol 2020. [DOI: 10.1016/s0167-8140(21)01381-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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8
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Yamamoto T, Okada T, Fushimi Y, Yamamoto A, Fujimoto K, Okuchi S, Fukutomi H, Takahashi JC, Funaki T, Miyamoto S, Stalder AF, Natsuaki Y, Speier P, Togashi K. Magnetic resonance angiography with compressed sensing: An evaluation of moyamoya disease. PLoS One 2018; 13:e0189493. [PMID: 29351284 PMCID: PMC5774704 DOI: 10.1371/journal.pone.0189493] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Accepted: 11/27/2017] [Indexed: 11/18/2022] Open
Abstract
Compressed sensing (CS) reconstructions of under-sampled measurements generate missing data based on assumptions of image sparsity. Non-contrast time-of-flight MR angiography (TOF-MRA) is a good candidate for CS based acceleration, as MRA images feature bright trees of sparse vessels over a well-suppressed anatomical background signal. A short scan time derived from CS is beneficial for patients of moyamoya disease (MMD) because of the frequency of MR scans. The purpose of this study was to investigate the reliability of TOF-MRA with CS in the evaluation of MMD. Twenty-two patients were examined using TOF-MRA with CS (CS-TOF) and parallel imaging (PI-TOF). The acceleration factors were 3 (CS3) and 5 (CS5) for CS-TOF, and 3 (PI3) for PI-TOF. Two neuroradiologists evaluated the MMD grading according to stenosis/occlusion scores using the modified Houkin’s system, and the visibility of moyamoya vessels (MMVs) using a 3-point scale. Concordance was calculated with Cohen’s κ. The numbers of MMVs in the basal ganglia were compared using Bland-Altman analysis and Wilcoxon’s signed-rank tests. MRA scan times were 4:07, 3:53, and 2:42 for PI3, CS3, and CS5, respectively. CS-reconstruction completed within 10 minutes. MMD grading and MMV visibility scales showed excellent correlation (κ > .966). Although the number of MMVs was significantly higher in CS3 than in PI3 (p < .0001) and CS5 (p < .0001), Bland-Altman analysis showed a good agreement between PI3, CS3, and CS5. Compressed sensing can accelerate TOF-MRA with improved visualization of small collaterals in equivalent time (CS3) or equivalent results in a shorter scan time (CS5).
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Affiliation(s)
- Takayuki Yamamoto
- Department of Diagnostic Imaging and Nuclear Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Tomohisa Okada
- Department of Diagnostic Imaging and Nuclear Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
- * E-mail:
| | - Yasutaka Fushimi
- Department of Diagnostic Imaging and Nuclear Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Akira Yamamoto
- Department of Diagnostic Imaging and Nuclear Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Koji Fujimoto
- Department of Diagnostic Imaging and Nuclear Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Sachi Okuchi
- Department of Diagnostic Imaging and Nuclear Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Hikaru Fukutomi
- Department of Diagnostic Imaging and Nuclear Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Jun C. Takahashi
- Department of Diagnostic Imaging and Nuclear Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
- Department of Neurosurgery, National Cerebral and Cardiovascular Center, Suita, Japan
| | - Takeshi Funaki
- Department of Neurosurgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Susumu Miyamoto
- Department of Neurosurgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | | | - Yutaka Natsuaki
- Siemens Medical Solutions USA, Inc., Huntington Beach, California, United States of America
| | | | - Kaori Togashi
- Department of Diagnostic Imaging and Nuclear Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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Celicanin Z, Manasseh G, Petrusca L, Scheffler K, Auboiroux V, Crowe LA, Hyacinthe JN, Natsuaki Y, Santini F, Becker CD, Terraz S, Bieri O, Salomir R. Hybrid ultrasound-MR guided HIFU treatment method with 3D motion compensation. Magn Reson Med 2017; 79:2511-2523. [PMID: 28944490 DOI: 10.1002/mrm.26897] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Revised: 08/10/2017] [Accepted: 08/11/2017] [Indexed: 01/16/2023]
Abstract
PURPOSE Treatments using high-intensity focused ultrasound (HIFU) in the abdominal region remain challenging as a result of respiratory organ motion. A novel method is described here to achieve 3D motion-compensated ultrasound (US) MR-guided HIFU therapy using simultaneous ultrasound and MRI. METHODS A truly hybrid US-MR-guided HIFU method was used to plan and control the treatment. Two-dimensional ultrasound was used in real time to enable tracking of the motion in the coronal plane, whereas an MR pencil-beam navigator was used to detect anterior-posterior motion. Prospective motion compensation of proton resonance frequency shift (PRFS) thermometry and HIFU electronic beam steering were achieved. RESULTS The 3D prospective motion-corrected PRFS temperature maps showed reduced intrascan ghosting artifacts, a high signal-to-noise ratio, and low geometric distortion. The k-space data yielded a consistent temperature-dependent PRFS effect, matching the gold standard thermometry within approximately 1°C. The maximum in-plane temperature elevation ex vivo was improved by a factor of 2. Baseline thermometry acquired in volunteers indicated reduction of residual motion, together with an accuracy/precision of near-harmonic referenceless PRFS thermometry on the order of 0.5/1.0°C. CONCLUSIONS Hybrid US-MR-guided HIFU ablation with 3D motion compensation was demonstrated ex vivo together with a stable referenceless PRFS thermometry baseline in healthy volunteer liver acquisitions. Magn Reson Med 79:2511-2523, 2018. © 2017 International Society for Magnetic Resonance in Medicine.
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Affiliation(s)
- Zarko Celicanin
- Department of Radiology, Division of Radiological Physics, University of Basel Hospital, Basel, Switzerland.,Department of Biomedical Engineering, University of Basel, Basel, Switzerland
| | - Gibran Manasseh
- Image Guided Interventions Laboratory, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Lorena Petrusca
- Hepatobiliary and Pancreatic Interventional Radiology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Klaus Scheffler
- MRC Department, MPI for Biological Cybernetics, Tübingen, Germany.,Department of Biomedical Magnetic Resonance, University of Tübingen, Tübingen, Germany
| | - Vincent Auboiroux
- Image Guided Interventions Laboratory, Faculty of Medicine, University of Geneva, Geneva, Switzerland.,Clinatec/LETI/CEA, 38054, Grenoble, France
| | - Lindsey A Crowe
- Radiology Department, University Hospitals of Geneva, Geneva, Switzerland
| | - Jean-Noel Hyacinthe
- Image Guided Interventions Laboratory, Faculty of Medicine, University of Geneva, Geneva, Switzerland.,School of Health Sciences, HES-SO, University of Applied Sciences and Arts of Western Switzerland, Geneva, Switzerland
| | | | - Francesco Santini
- Department of Radiology, Division of Radiological Physics, University of Basel Hospital, Basel, Switzerland.,Department of Biomedical Engineering, University of Basel, Basel, Switzerland
| | - Christoph D Becker
- Hepatobiliary and Pancreatic Interventional Radiology, Faculty of Medicine, University of Geneva, Geneva, Switzerland.,Radiology Department, University Hospitals of Geneva, Geneva, Switzerland
| | - Sylvain Terraz
- Image Guided Interventions Laboratory, Faculty of Medicine, University of Geneva, Geneva, Switzerland.,Radiology Department, University Hospitals of Geneva, Geneva, Switzerland
| | - Oliver Bieri
- Department of Radiology, Division of Radiological Physics, University of Basel Hospital, Basel, Switzerland.,Department of Biomedical Engineering, University of Basel, Basel, Switzerland
| | - Rares Salomir
- Image Guided Interventions Laboratory, Faculty of Medicine, University of Geneva, Geneva, Switzerland.,Radiology Department, University Hospitals of Geneva, Geneva, Switzerland
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Natsuaki Y, Ishii N, Ohata C, Kabashima K, Nakama T. 031 Inducible skin-associated lymphoid tissue (iSALT) is detected in the scalp treated with topical immunotherapy for alopecia areata. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.02.044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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11
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Armstrong T, Dregely I, Stemmer A, Han F, Natsuaki Y, Sung K, Wu HH. Free-breathing liver fat quantification using a multiecho 3D stack-of-radial technique. Magn Reson Med 2017; 79:370-382. [PMID: 28419582 DOI: 10.1002/mrm.26693] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Revised: 02/22/2017] [Accepted: 03/09/2017] [Indexed: 12/11/2022]
Abstract
PURPOSE The diagnostic gold standard for nonalcoholic fatty liver disease is an invasive biopsy. Noninvasive Cartesian MRI fat quantification remains limited to a breath-hold (BH). In this work, a novel free-breathing 3D stack-of-radial (FB radial) liver fat quantification technique is developed and evaluated in a preliminary study. METHODS Phantoms and healthy subjects (n = 11) were imaged at 3 Tesla. The proton-density fat fraction (PDFF) determined using FB radial (with and without scan acceleration) was compared to BH single-voxel MR spectroscopy (SVS) and BH 3D Cartesian MRI using linear regression (correlation coefficient ρ and concordance coefficient ρc ) and Bland-Altman analysis. RESULTS In phantoms, PDFF showed significant correlation (ρ > 0.998, ρc > 0.995) and absolute mean differences < 2.2% between FB radial and BH SVS, as well as significant correlation (ρ > 0.999, ρc > 0.998) and absolute mean differences < 0.6% between FB radial and BH Cartesian. In the liver and abdomen, PDFF showed significant correlation (ρ > 0.986, ρc > 0.985) and absolute mean differences < 1% between FB radial and BH SVS, as well as significant correlation (ρ > 0.996, ρc > 0.995) and absolute mean differences < 0.9% between FB radial and BH Cartesian. CONCLUSION Accurate 3D liver fat quantification can be performed in 1 to 2 min using a novel FB radial technique. Magn Reson Med 79:370-382, 2018. © 2017 International Society for Magnetic Resonance in Medicine.
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Affiliation(s)
- Tess Armstrong
- Department of Radiological Sciences, University of California Los Angeles, Los Angeles, California, USA.,Department of Physics and Biology in Medicine, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA
| | - Isabel Dregely
- Department of Radiological Sciences, University of California Los Angeles, Los Angeles, California, USA.,Department of Biomedical Engineering, King's College London, London, United Kingdom
| | | | - Fei Han
- Department of Radiological Sciences, University of California Los Angeles, Los Angeles, California, USA
| | | | - Kyunghyun Sung
- Department of Radiological Sciences, University of California Los Angeles, Los Angeles, California, USA.,Department of Physics and Biology in Medicine, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA
| | - Holden H Wu
- Department of Radiological Sciences, University of California Los Angeles, Los Angeles, California, USA.,Department of Physics and Biology in Medicine, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA
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12
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Rehwald WG, Wendell DC, Jenista E, Kim HW, Parker M, Natsuaki Y, Chen EL, Klem I, Kim R. Fully Automatic Rapid inversion time (TI) Adjustment for Late Gadolinium Enhancement (LGE) Imaging Using a Pencil Beam Excitation Pulse for Single-Line T1 (SLT1) Mapping of Myocardium. J Cardiovasc Magn Reson 2016. [PMCID: PMC5032135 DOI: 10.1186/1532-429x-18-s1-p322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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13
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Timoh T, Lim RP, Bruno M, McNeal GR, Natsuaki Y, Srichai MB. Evaluation and comparison of ECG-gated techniques at 1.5 T for contrast enhanced MR angiography of the thoracic aorta. J Cardiovasc Magn Reson 2015. [PMCID: PMC4328558 DOI: 10.1186/1532-429x-17-s1-p397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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14
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Fan Z, Yang Q, Xie Y, Xie G, Qu X, Bi X, Natsuaki Y, Li D. Cerebral venous thrombosis: direct thrombus imaging with sub-millimeter isotropic resolution dark-blood CMR. J Cardiovasc Magn Reson 2015. [PMCID: PMC4328238 DOI: 10.1186/1532-429x-17-s1-p402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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15
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Xie G, Bi X, Liu J, Yang Q, Natsuaki Y, Conte AH, Liu X, Li K, Li D, Fan Z. Three-dimensional coronary dark-blood interleaved with gray-blood (cDIG) magnetic resonance imaging at 3 tesla. Magn Reson Med 2015; 75:997-1007. [PMID: 25858528 DOI: 10.1002/mrm.25585] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Revised: 11/20/2014] [Accepted: 11/25/2014] [Indexed: 01/26/2023]
Abstract
PURPOSE Three-dimensional (3D) dark-blood MRI has shown great potential in coronary artery plaque evaluation. However, substantial variability in quantification could result from superficial calcification because of its low signal. To address this issue, a 3D coronary dark-blood interleaved with gray-blood (cDIG) technique was developed. METHODS cDIG is based on a balanced steady-state free precession readout combined with a local re-inversion-based double-inversion-recovery (LocReInv-DIR) preparation. The LocReInv-DIR is applied every two RR intervals. Dark-blood and gray-blood contrasts are collected in the first and second RR interval, respectively. To improve the respiratory gating efficiency, two independent navigators were developed to separately gate the respiratory motion for the two interleaved acquisitions. In vivo experiments in eight healthy subjects and one patient were conducted to validate the technique. RESULTS cDIG provided dual-contrasts without compromise in scan time. The dark-blood images with cDIG demonstrated excellent wall and lumen signal performances and morphological measurements. Advantageously, cDIG yielded a second contrast that was shown to help identify the superficial calcification in the coronary plaque of a patient. CONCLUSION A novel technique was developed for obtaining 3D coronary vessel wall and gray lumen images. The additional contrast may aid in identifying calcified nodules and thus potentially improve the evaluation of coronary plaque burden.
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Affiliation(s)
- Guoxi Xie
- Shenzhen Key Lab for MRI, BCMIIS, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, China.,Biomedical Imaging Research Institute, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Xiaoming Bi
- Siemens Healthcare, Los Angeles, California, USA
| | - Jiabin Liu
- Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Qi Yang
- Xuanwu Hospital, Capital Medical University, Beijing, China
| | | | | | - Xin Liu
- Shenzhen Key Lab for MRI, BCMIIS, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, China
| | - Kuncheng Li
- Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Debiao Li
- Biomedical Imaging Research Institute, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Zhaoyang Fan
- Biomedical Imaging Research Institute, Cedars-Sinai Medical Center, Los Angeles, California, USA
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17
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Rapacchi S, Natsuaki Y, Plotnik A, Gabriel S, Laub G, Finn JP, Hu P. Reducing view-sharing using compressed sensing in time-resolved contrast-enhanced magnetic resonance angiography. Magn Reson Med 2014; 74:474-81. [PMID: 25157749 DOI: 10.1002/mrm.25414] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Revised: 07/23/2014] [Accepted: 07/25/2014] [Indexed: 11/11/2022]
Abstract
PURPOSE To study temporal and spatial blurring artifacts from k-space view-sharing in time-resolved MR angiography (MRA) and to propose a technique for reducing these artifacts. METHODS We acquired k-space data sets using a three-dimensional time-resolved MRA view-sharing sequence and retrospectively reformatted them into two reconstruction frameworks: full view-sharing via time-resolved imaging with stochastic trajectories (TWIST) and minimal k-space view-sharing and compressed sensing (CS-TWIST). The two imaging series differed in temporal footprint but not in temporal frame rate. The artifacts from view-sharing were compared qualitatively and quantitatively in nine patients in addition to a phantom experiment. RESULTS CS-TWIST was able to reduce the imaging temporal footprint by two- to three-fold compared with TWIST, and the overall subjective image quality of CS-TWIST was higher than that for TWIST (P < 0.05). View sharing caused a delay in the visualization of small blood vessels, and the mean transit time of the carotid artery calculated based on TWIST reconstruction was 0.6 s longer than that for CS-TWIST (P < 0.01). In thoracic MRA, the shorter temporal footprint decreased the sensitivity to physiological motion blurring, and vessel sharpness was improved by 8.8% ± 6.0% using CS-TWIST (P < 0.05). CONCLUSION In time-resolved MRA, the longer temporal footprint due to view-sharing causes spatial and temporal artifacts. CS-TWIST is a promising method for reducing these artifacts.
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Affiliation(s)
- Stanislas Rapacchi
- Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, California, USA
| | | | - Adam Plotnik
- Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, California, USA
| | - Simon Gabriel
- Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, California, USA
| | - Gerhard Laub
- Siemens Healthcare, Los Angeles, California, USA
| | - J Paul Finn
- Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, California, USA
| | - Peng Hu
- Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, California, USA
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18
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Liu Q, Tawackoli W, Pelled G, Fan Z, Jin N, Natsuaki Y, Bi X, Gart A, Bae H, Gazit D, Li D. Detection of low back pain using pH level-dependent imaging of the intervertebral disc using the ratio of R1ρ dispersion and -OH chemical exchange saturation transfer (RROC). Magn Reson Med 2014; 73:1196-205. [PMID: 24700573 DOI: 10.1002/mrm.25186] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2013] [Revised: 01/28/2014] [Accepted: 01/28/2014] [Indexed: 11/08/2022]
Abstract
PURPOSE Low pH is associated with intervertebral disc (IVD)-generated low back pain (LBP). The purpose of this work was to develop an in vivo pH level-dependent magnetic resonance imaging (MRI) method for detecting discogenic LBP, without using exogenous contrast agents. METHODS The ratio of R1ρ dispersion and chemical exchange saturation transfer (CEST) (RROC) was used for pH-level dependent imaging of the IVD while eliminating the effect of labile proton concentration. The technique was validated by numerical simulations and studies on phantoms and ex vivo porcine spines. Four male (ages 42.8 ± 18.3) and two female patients (ages 55.5 ± 2.1) with LBP and scheduled for discography were examined with the method on a 3.0 Tesla MR scanner. RROC measurements were compared with discography outcomes using paired t-test. RESULTS Simulation and phantom results indicated RROC is a concentration independent and pH level-dependent technique. Porcine spine study results found higher RROC value was related to lower pH level. Painful discs based on discography had significant higher RROC values than those with negative diagnosis (P < 0.05). CONCLUSION RROC imaging is a promising pH level dependent MRI technique that has the potential to be a noninvasive imaging tool to detect painful IVDs in vivo.
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Affiliation(s)
- Qi Liu
- Biomedical Imaging Research Institute, Cedars-Sinai Medical Center, Los Angeles, California, USA; Department of Biomedical Engineering, Northwestern University, Chicago, Illinois, USA
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Shao J, Nguyen KL, Natsuaki Y, Spottiswoode B, Hu P. Instantaneous signal loss simulation (InSiL): an improved algorithm for myocardial T₁ mapping using the MOLLI sequence. J Magn Reson Imaging 2014; 41:721-9. [PMID: 24677371 DOI: 10.1002/jmri.24599] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Accepted: 01/28/2014] [Indexed: 11/06/2022] Open
Abstract
PURPOSE To propose a T1 mapping algorithm for the modified Look-Locker inversion-recovery (MOLLI) sequence that can improve T1 estimation accuracy. MATERIALS AND METHODS The modified T1 mapping algorithm (InSiL) is based on the simulation of MOLLI signal evolution and simulates the longitudinal magnetization signal perturbation by each single-shot image acquisition in MOLLI as an instantaneous signal loss. InSiL was evaluated against original MOLLI using Bloch simulations, phantom studies, and in 15 healthy volunteers at 1.5T. RESULTS In phantom studies, the maximum absolute error by InSiL is less than 2%, while that by MOLLI is more than 20% for T1 values from 221 msec to 1539 msec. The benefit of InSiL is greatest at heart rate (HR) >80 bpm and T1 >1000 msec, and InSiL reduced MOLLI T1 error from 14.9 ± 4.5% to 0.4 ± 0.3%. Average InSiL-derived native myocardial T1 values at 1.5T in healthy volunteers were significantly higher than MOLLI-derived values by 236.9 ± 11.7 msec (1160.3 ± 25.1 msec vs. 923.4 ± 22.3 msec, P < 0.001) at an average HR of 65.1 ± 14.7 bpm. CONCLUSION The proposed InSiL approach yields better T1 mapping accuracy than MOLLI, and is less sensitive to HR variation in tissues with longer T1 values.
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Affiliation(s)
- Jiaxin Shao
- Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, California, USA
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20
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Xie Y, Fan Z, Saouaf R, Natsuaki Y, Laub G, Li D. Adaptive online self-gating (ADIOS) for free-breathing noncontrast renal MR angiography. Magn Reson Med 2014; 73:312-7. [PMID: 24478221 DOI: 10.1002/mrm.25121] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2013] [Revised: 12/15/2013] [Accepted: 12/16/2013] [Indexed: 11/11/2022]
Abstract
PURPOSE To develop a respiratory self-gating method, adaptive online self-gating (ADIOS), for noncontrast MR angiography (NC MRA) of renal arteries to overcome some limitations of current free-breathing methods. METHODS A NC MRA pulse sequence for online respiratory self-gating was developed based on three-dimensional balanced steady-state free precession (bSSFP) and slab-selective inversion-recovery. Motion information was derived directly from the slab being imaged for online gating. Scan efficiency was maintained by an automatic adaptive online algorithm. Qualitative and quantitative assessments of image quality were performed and results were compared with conventional diaphragm navigator (NAV). RESULTS NC MRA imaging was successfully completed in all subjects (n = 15). Similarly good image quality was observed in the proximal-middle renal arteries with ADIOS compared with NAV. Superior image quality was observed in the middle-distal renal arteries in the right kidneys with no NAV-induced artifacts. Maximal visible artery length was significantly longer with ADIOS versus NAV in the right kidneys. NAV setup was completely eliminated and scan time was significantly shorter with ADIOS on average compared with NAV. CONCLUSION The proposed ADIOS technique for noncontrast MRA provides high-quality visualization of renal arteries with no diaphragm navigator-induced artifacts, simplified setup, and shorter scan time.
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Affiliation(s)
- Yibin Xie
- University of California, Los Angeles, Department of Bioengineering, Los Angeles, California, USA.,Cedars-Sinai Medical Center, Biomedical Imaging Research Institute, Department of Biomedical Sciences, Los Angeles, California, USA
| | - Zhaoyang Fan
- Cedars-Sinai Medical Center, Biomedical Imaging Research Institute, Department of Biomedical Sciences, Los Angeles, California, USA
| | - Rola Saouaf
- Cedars-Sinai Medical Center, Department of Imaging, Los Angeles, California, USA
| | | | - Gerhard Laub
- Siemens Medical Solutions, Los Angeles, California, USA
| | - Debiao Li
- University of California, Los Angeles, Department of Bioengineering, Los Angeles, California, USA.,Cedars-Sinai Medical Center, Biomedical Imaging Research Institute, Department of Biomedical Sciences, Los Angeles, California, USA
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21
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Deng Z, Fan Z, Xie G, He Y, Natsuaki Y, Jin N, Bi X, An J, Liu X, Zhang Z, Fan Z, Li D. Pressure gradient measurement in the coronary artery using 4D PC-MRI: towards noninvasive quantification of fractional flow reserve. J Cardiovasc Magn Reson 2014. [PMCID: PMC4044180 DOI: 10.1186/1532-429x-16-s1-o55] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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22
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Shao J, Natsuaki Y, Spottiswoode BS, Hu P. Instantaneous Signal Loss simulation (InSiL) - an alternative algorithm for myocardial T1 mapping using the MOLLI sequence. J Cardiovasc Magn Reson 2014. [PMCID: PMC4043513 DOI: 10.1186/1532-429x-16-s1-p26] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jiaxin Shao
- Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, California, USA
| | | | | | - Peng Hu
- Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, California, USA,Biomedical Physics Inter-Departmental Graduate Program, University of California, Los Angeles, California, USA
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23
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Fan Z, Xie Y, Yu W, Yang Q, Bi X, Natsuaki Y, Laub G, An J, Zhang Z, Li K, Fan Z, Li D. Carotid Multicontrast ATherosclerosis CHaracterization (MATCH) in a single scan. J Cardiovasc Magn Reson 2014. [PMCID: PMC4045139 DOI: 10.1186/1532-429x-16-s1-p46] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Liu Q, Jin N, Fan Z, Natsuaki Y, Tawackoli W, Pelled G, Bae H, Gazit D, Li D. Reliable chemical exchange saturation transfer imaging of human lumbar intervertebral discs using reduced-field-of-view turbo spin echo at 3.0 T. NMR Biomed 2013; 26:1672-1679. [PMID: 23893565 DOI: 10.1002/nbm.3001] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Revised: 06/06/2013] [Accepted: 06/18/2013] [Indexed: 06/02/2023]
Abstract
The reduced field-of-view (rFOV) turbo-spin-echo (TSE) technique, which effectively suppresses bowel movement artifacts, is developed for the purpose of chemical exchange saturation transfer (CEST) imaging of the intervertebral disc (IVD) in vivo. Attempts to quantify IVD CEST signals in a clinical setting require high reliability and accuracy, which is often compromised in the conventionally used technique. The proposed rFOV TSE CEST method demonstrated significantly superior reproducibility when compared with the conventional technique on healthy volunteers, implying it is a more reliable measurement. Phantom study revealed a linear relation between CEST signal and glycosaminoglycan (GAG) concentration. The feasibility of detecting IVD degeneration was demonstrated on a healthy volunteer, indicating that the proposed method is a promising tool to quantify disc degeneration.
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Affiliation(s)
- Qi Liu
- Biomedical Imaging Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA, USA; Department of Biomedical Engineering, Northwestern University, Chicago, IL, USA
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Rapacchi S, Han F, Natsuaki Y, Kroeker R, Plotnik A, Lehrman E, Sayre J, Laub G, Finn JP, Hu P. High spatial and temporal resolution dynamic contrast-enhanced magnetic resonance angiography using compressed sensing with magnitude image subtraction. Magn Reson Med 2013; 71:1771-83. [PMID: 23801456 DOI: 10.1002/mrm.24842] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2012] [Revised: 04/29/2013] [Accepted: 05/21/2013] [Indexed: 11/06/2022]
Abstract
PURPOSE We propose a compressed-sensing (CS) technique based on magnitude image subtraction for high spatial and temporal resolution dynamic contrast-enhanced MR angiography (CE-MRA). METHODS Our technique integrates the magnitude difference image into the CS reconstruction to promote subtraction sparsity. Fully sampled Cartesian 3D CE-MRA datasets from 6 volunteers were retrospectively under-sampled and three reconstruction strategies were evaluated: k-space subtraction CS, independent CS, and magnitude subtraction CS. The techniques were compared in image quality (vessel delineation, image artifacts, and noise) and image reconstruction error. Our CS technique was further tested on seven volunteers using a prospectively under-sampled CE-MRA sequence. RESULTS Compared with k-space subtraction and independent CS, our magnitude subtraction CS provides significantly better vessel delineation and less noise at 4× acceleration, and significantly less reconstruction error at 4× and 8× (P < 0.05 for all). On a 1-4 point image quality scale in vessel delineation, our technique scored 3.8 ± 0.4 at 4×, 2.8 ± 0.4 at 8×, and 2.3 ± 0.6 at 12× acceleration. Using our CS sequence at 12× acceleration, we were able to acquire dynamic CE-MRA with higher spatial and temporal resolution than current clinical TWIST protocol while maintaining comparable image quality (2.8 ± 0.5 vs. 3.0 ± 0.4, P = NS). CONCLUSION Our technique is promising for dynamic CE-MRA.
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Affiliation(s)
- Stanislas Rapacchi
- Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, California, USA
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Reyhan M, Natsuaki Y, Ennis DB. Off-resonance insensitive complementary SPAtial Modulation of Magnetization (ORI-CSPAMM) for quantification of left ventricular twist. J Magn Reson Imaging 2013; 39:339-45. [PMID: 23625854 DOI: 10.1002/jmri.24154] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2012] [Accepted: 03/05/2013] [Indexed: 12/31/2022] Open
Abstract
PURPOSE To evaluate Off Resonance Insensitive Complementary SPAtial Modulation of Magnetization (ORI-CSPAMM) and Fourier Analysis of STimulated echoes (FAST) for the quantification of left ventricular (LV) systolic and diastolic function and compare it with the previously validated FAST+SPAMM technique. MATERIALS AND METHODS LV short-axis tagged images were acquired with ORI-CSPAMM and SPAMM in healthy volunteers (n = 13). The FAST method was used to automatically estimate LV systolic and diastolic twist parameters from rotation of the stimulated echo and stimulated anti-echo about the middle of k-space subsequent to ∼3 min of user interaction. RESULTS There was no significant difference between measures obtained for FAST+ORI-CSPAMM and FAST+SPAMM for mean peak twist (12.9 ± 3.4° versus 11.9 ± 4.0°; P = 0.4), torsion (3.3 ± 0.9°/cm versus 2.9 ± 1.0°/cm, P = 0.3), circumferential-longitudinal shear angle (9.1 ± 3.0° versus 8.2 ± 3.4°, P = 0.3), twisting rate (79.6 ± 20.2°/s versus 68.2 ± 23.4°/s, P = 0.1), untwisting rate (-117.5 ± 31.4°/s versus -106.6 ± 32.4°/s, P = 0.3), normalized untwisting rate (-9.3 ± 2.0/s versus -9.9 ± 4.4/s, P = 0.7), and time of peak twist (281 ± 18 ms versus 293 ± 25 ms, P = 0.04). FAST+ORI-CSPAMM also provided measures of duration of untwisting (148 ± 21 ms) and the ratio of rapid untwisting to peak twist (0.9 ± 0.3). Bland-Altman analysis of FAST+ORI-CSPAMM and FAST+SPAMM twist data demonstrates excellent agreement with a bias of -0.1° and 95% confidence intervals of (-1.0°, 3.2°). CONCLUSION FAST+ORI-CSPAMM is a semi-automated method that provides a quick and quantitative assessment of LV systolic and diastolic twist and torsion. ORI-CSPAMM corrects off-resonance accrued during tagging preparation and readout and visibly removes chemical shift from the tagging pattern, which confers greater robustness to the derived quantitative measures.
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Affiliation(s)
- Meral Reyhan
- Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, California, USA; Biomedical Physics Interdepartmental Program, University of California, Los Angeles, California, USA
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Fan Z, Xie J, He Y, Natsuaki Y, Jin N, Berman DS, Li D. Black-blood dynamic contrast-enhanced carotid artery wall MRI with SRDIR preparation. J Cardiovasc Magn Reson 2013. [PMCID: PMC3559905 DOI: 10.1186/1532-429x-15-s1-p246] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Harris RJ, Cloughesy TF, Pope WB, Godinez S, Natsuaki Y, Nghiemphu PL, Meyer H, Paul D, Behbahanian Y, Lai A, Ellingson BM. Pre- and post-contrast three-dimensional double inversion-recovery MRI in human glioblastoma. J Neurooncol 2013; 112:257-66. [PMID: 23344788 DOI: 10.1007/s11060-013-1057-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Accepted: 01/15/2013] [Indexed: 11/26/2022]
Abstract
Fluid attenuated inversion recovery (FLAIR) MRI sequences have become an indispensible tool for defining the malignant boundary in patients with brain tumors by nulling the signal contribution from cerebrospinal fluid allowing both regions of edema and regions of non-enhancing, infiltrating tumor to become hyperintense on resulting images. In the current study we examined the utility of a three-dimensional double inversion recovery (DIR) sequence that additionally nulls the MR signal associated with white matter, implemented either pre-contrast or post-contrast, in order to determine whether this sequence allows for better differentiation between tumor and normal brain tissue. T1- and T2-weighted, FLAIR, dynamic susceptibility contrast (DSC)-MRI estimates of cerebral blood volume (rCBV), contrast-enhanced T1-weighted images (T1+C), and DIR data (pre- or post-contrast) were acquired in 22 patients with glioblastoma. Contrast-to-noise (CNR) and tumor volumes were compared between DIR and FLAIR sequences. Line profiles across regions of tumor were generated to evaluate similarities between image contrasts. Additionally, voxel-wise associations between DIR and other sequences were examined. Results suggested post-contrast DIR images were hyperintense (bright) in regions spatially similar those having FLAIR hyperintensity and hypointense (dark) in regions with contrast-enhancement or elevated rCBV due to the high sensitivity of 3D turbo spin echo sequences to susceptibility differences between different tissues. DIR tumor volumes were statistically smaller than tumor volumes as defined by FLAIR (Paired t test, P = 0.0084), averaging a difference of approximately 14 mL or 24 %. DIR images had approximately 1.5× higher lesion CNR compared with FLAIR images (Paired t test, P = 0.0048). Line profiles across tumor regions and scatter plots of voxel-wise coherence between different contrasts confirmed a positive correlation between DIR and FLAIR signal intensity and a negative correlation between DIR and both post-contrast T1-weighted image signal intensity and rCBV. Additional discrepancies between FLAIR and DIR abnormal regions were also observed, together suggesting DIR may provide additional information beyond that of FLAIR.
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Affiliation(s)
- Robert J Harris
- Department of Radiological Sciences, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA 90024, USA
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Fan Z, Xie J, He Y, Natsuaki Y, Jin N, Berman DS, Li D. Black-blood dynamic contrast-enhanced coronary artery wall MRI: a potential tool for kinetic-modeling-based wall inflammation assessment. J Cardiovasc Magn Reson 2013. [PMCID: PMC3560054 DOI: 10.1186/1532-429x-15-s1-w13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Xie Y, Fan Z, Saouaf R, Natsuaki Y, Laub G, Li D. Free-breathing non-contrast MRA with efficiency-adaptive self navigation. J Cardiovasc Magn Reson 2013. [PMCID: PMC3559870 DOI: 10.1186/1532-429x-15-s1-p233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Rapacchi S, Han F, Natsuaki Y, Kroeker RM, Plotnik AN, Lehrman E, Sayre J, Laub G, Finn JP, Hu P. High spatial and temporal resolution dynamic contrast-enhanced magnetic resonance angiography (CE-MRA) using compressed sensing with magnitude image subtraction. J Cardiovasc Magn Reson 2013. [PMCID: PMC3559411 DOI: 10.1186/1532-429x-15-s1-e82] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
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Nakamizo S, Egawa G, Doi H, Natsuaki Y, Miyachi Y, Kabashima K. Topical treatment with basic fibroblast growth factor promotes wound healing and barrier recovery induced by skin abrasion. Skin Pharmacol Physiol 2012; 26:22-9. [PMID: 23108135 DOI: 10.1159/000343208] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Accepted: 09/05/2012] [Indexed: 01/13/2023]
Abstract
It has been reported that basic fibroblast growth factor (bFGF) promotes the healing of skin ulceration by inducing fibroblast proliferation, yet the role of bFGF on epidermal barrier function, especially from the perspective of scratch-induced skin abrasion, remains unknown. To this end, we initially developed an epidermal abrasion mouse model induced by scratching with a stainless-steel wire brush, and examined the effects of bFGF on the wound healing induced by skin abrasion. This procedure induced a significant elevation of transepidermal water loss (TEWL) in a scratch-count-dependent manner. This elevated TEWL was significantly decreased following topical application of bFGF to the skin. In addition, bFGF increased the expression of Ki67 in keratinocytes following mechanical scratching. These results suggest that bFGF enhances keratinocyte proliferation, which, in turn, repairs the skin barrier disruption and wounds caused by scratching in mice. Consistently, bFGF stimulated proliferation of normal human epidermal keratinocytes (NHEK). Intriguingly, the effect of bFGF and other growth factors on NHEK proliferation was additive. However, high cell density diminished the effect of bFGF on NHEK proliferation. This particular result can be explained by our observation that FGF receptor mRNA expression in NHEK was low under conditions of high cell density. Our findings suggest that bFGF stimulates keratinocyte proliferation, especially in a lower cell density environment, to repair skin wound in accord with skin barrier recovery.
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Affiliation(s)
- S Nakamizo
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
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Koga H, Ohyama B, Tsuruta D, Ishii N, Hamada T, Dainichi T, Natsuaki Y, Sogame R, Fukuda S, Karashima T, Tada J, Yamashiro M, Uezato H, Chan PT, Hashimoto T. Five Japanese cases of antidesmoglein 1 antibody‐positive and antidesmoglein 3 antibody‐negative pemphigus with oral lesions. Br J Dermatol 2012; 166:976-80. [DOI: 10.1111/j.1365-2133.2012.10827.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- H. Koga
- Department of Dermatology, Kurume University School of Medicine, and Kurume University Institute of Cutaneous Cell Biology, 67 Asahimachi, Kurume, Fukuoka 830‐0011, Japan
| | - B. Ohyama
- Department of Dermatology, Kurume University School of Medicine, and Kurume University Institute of Cutaneous Cell Biology, 67 Asahimachi, Kurume, Fukuoka 830‐0011, Japan
| | - D. Tsuruta
- Department of Dermatology, Kurume University School of Medicine, and Kurume University Institute of Cutaneous Cell Biology, 67 Asahimachi, Kurume, Fukuoka 830‐0011, Japan
| | - N. Ishii
- Department of Dermatology, Kurume University School of Medicine, and Kurume University Institute of Cutaneous Cell Biology, 67 Asahimachi, Kurume, Fukuoka 830‐0011, Japan
| | - T. Hamada
- Department of Dermatology, Kurume University School of Medicine, and Kurume University Institute of Cutaneous Cell Biology, 67 Asahimachi, Kurume, Fukuoka 830‐0011, Japan
| | - T. Dainichi
- Department of Dermatology, Kurume University School of Medicine, and Kurume University Institute of Cutaneous Cell Biology, 67 Asahimachi, Kurume, Fukuoka 830‐0011, Japan
| | - Y. Natsuaki
- Department of Dermatology, Kurume University School of Medicine, and Kurume University Institute of Cutaneous Cell Biology, 67 Asahimachi, Kurume, Fukuoka 830‐0011, Japan
| | - R. Sogame
- Department of Dermatology, Kurume University School of Medicine, and Kurume University Institute of Cutaneous Cell Biology, 67 Asahimachi, Kurume, Fukuoka 830‐0011, Japan
| | - S. Fukuda
- Department of Dermatology, Kurume University School of Medicine, and Kurume University Institute of Cutaneous Cell Biology, 67 Asahimachi, Kurume, Fukuoka 830‐0011, Japan
| | - T. Karashima
- Department of Dermatology, Kurume University School of Medicine, and Kurume University Institute of Cutaneous Cell Biology, 67 Asahimachi, Kurume, Fukuoka 830‐0011, Japan
| | - J. Tada
- Section of Dermatology, Kagawa Prefectural Central Hospital, 5‐4‐16 Bancho, Takamatsu‐shi, Kagawa 760‐8558, Japan
| | - M. Yamashiro
- Department of Dermatology, Ryukyu University School of Medicine, 207 Uehara Nishiharacho, Nakagamigun, Okinawa 903‐0125, Japan
| | - H. Uezato
- Department of Dermatology, Ryukyu University School of Medicine, 207 Uehara Nishiharacho, Nakagamigun, Okinawa 903‐0125, Japan
| | - P. T. Chan
- Social Hygiene Service, Department of Health, Cheung Sha Wan Dermatological Clinic, 3/F West Kowloon Health Centre, 303 Cheung Sha Wan Road, Kowloon, Hong Kong, China
| | - T. Hashimoto
- Department of Dermatology, Kurume University School of Medicine, and Kurume University Institute of Cutaneous Cell Biology, 67 Asahimachi, Kurume, Fukuoka 830‐0011, Japan
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Reyhan M, Natsuaki Y, Ennis DB. Fourier analysis of STimulated echoes (FAST) for the quantitative analysis of left ventricular twist. J Magn Reson Imaging 2011; 35:587-93. [PMID: 22069227 DOI: 10.1002/jmri.22863] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2011] [Accepted: 09/30/2011] [Indexed: 11/09/2022] Open
Abstract
PURPOSE To validate a novel method for the rapid and facile quantification of left ventricular (LV) twist from tagged magnetic resonance images and demonstrate the potential clinical utility in a series of 20 healthy volunteers. MATERIALS AND METHODS Cardiac magnetic resonance imaging (MRI) short-axis images were acquired with tissue tagging in 20 healthy subjects and six canines. The tagged images were processed using a novel Fourier Analysis of the STimulated echoes (FAST) method, which uses a series of Fourier-space operations to measure LV twist with limited user interaction. A subset of eight healthy subjects and the canine data were compared to results from previously validated "gold standard" software (FindTags). Interobserver and intraobserver coefficients of variation (CV(INTER) and CV(INTRA) ), linear regression, and Bland-Altman analyses were used to assess agreement between observers and methods. RESULTS CV(INTRA) for peak systolic twist (2.9% and 2.6%) and CV(INTER) (4.3% and 4.2%) were all small. Linear regression analysis of the FAST and FindTags twist values indicated very good agreement in healthy subjects (R = 0.91) and in canines (R = 0.95). Bland-Altman comparison of the FAST and FindTags twist results indicated excellent agreement in healthy subjects (bias of -0.5°, 95% confidence intervals (-4.3°, 4.3°)) and canines (bias of 0.2°, 95% confidence intervals (-2.7°, 3.1°)). Peak systolic twist in healthy subjects averaged 10.5 ± 1.9° degrees. CONCLUSION The FAST method for quantifying LV twist produces results that are not significantly different from the current "gold standard" in a fraction of the user interaction time and has demonstrated feasibility in human subjects.
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Affiliation(s)
- Meral Reyhan
- Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, California, USA.
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Wagner M, Natsuaki Y, Hamm B, Laub G, Finn PJ. Evaluation von chirurgischen Conduits und Shunts bei Erwachsenen mit kongenitaler Herzerkrankung mithilfe der dynamischen und konventionellen Magnetresonanz-Angiographie. ROFO-FORTSCHR RONTG 2011. [DOI: 10.1055/s-0031-1279355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Salo R, Buonocore MH, Leamon M, Natsuaki Y, Waters C, Moore CD, Galloway GP, Nordahl TE. Extended findings of brain metabolite normalization in MA-dependent subjects across sustained abstinence: a proton MRS study. Drug Alcohol Depend 2011; 113:133-8. [PMID: 20739127 PMCID: PMC3000435 DOI: 10.1016/j.drugalcdep.2010.07.015] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2010] [Revised: 06/20/2010] [Accepted: 07/06/2010] [Indexed: 11/26/2022]
Abstract
OBJECTIVE The goal of the present study was to extend our previous findings on long-term methamphetamine (MA) use and drug abstinence on brain metabolite levels in an expanded group of MA-dependent individuals. METHODS Seventeen MA abusers with sustained drug abstinence (1-5 years), 30 MA abusers with short-term drug abstinence (1-6 months) and 24 non-substance using controls were studied using MR spectroscopy (MRS). MRS measures of NAA/Cr, Cho/Cr and Cho/NAA were obtained in the anterior cingulate cortex (ACC) and in the primary visual cortex (PVC). RESULTS ACC-Cho/NAA values were abnormally high in the short-term abstinent group compared to controls [F(1,52) = 18.76, p < 0.0001]. No differences were observed between controls and the long-term abstinent group [F(1,39) = 0.97, p = 0.97]. New evidence of lower ACC-NAA/Cr levels were observed in the short-term abstinent MA abusers compared to controls [F(1,52) = 23.05, p < 0.0001] and long-term abstinent MA abusers [F(1,45) = 7.06, p = 0.01]. No differences were observed between long-term abstinent MA abusers and controls [F(1,39) = 0.48, p = 0.49]. CONCLUSIONS The new findings of relative NAA/Cr normalization across periods of abstinence suggest that adaptive changes following cessation of MA abuse may be broader than initially thought. These changes may contribute to some degree of normalization of neuronal function in the ACC.
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Affiliation(s)
- Ruth Salo
- Dept of Psychiatry and Behavioral Sciences, University of California, Davis, CA 95817, USA.
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Salo R, Leamon MH, Natsuaki Y, Moore C, Waters C, Nordahl TE. Findings of preserved implicit attention in methamphetamine dependent subjects. Prog Neuropsychopharmacol Biol Psychiatry 2008; 32:217-23. [PMID: 17870223 DOI: 10.1016/j.pnpbp.2007.08.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2007] [Revised: 08/14/2007] [Accepted: 08/14/2007] [Indexed: 11/25/2022]
Abstract
Long-term methamphetamine (MA) abuse is associated with a wide range of deficits on explicit tasks of selective attention. Less is known however about the effects of MA abuse on implicit measures of attention. Accordingly, we used a computerized spatial priming task to assess implicit attentional processes in 54 MA dependent subjects (mean age=37.04+/-8.9 years) and 32 healthy controls without history of any form of substance abuse (mean age=33.63+/-7.05 years). The MA dependent subjects had been drug-abstinent a minimum of 3 weeks with a mean duration of MA use of 13.27+/-7.75 years. The MA dependent subjects did not differ significantly from controls on either inhibitory priming [p=.37] or facilitory priming) [p=.69]. This result comports with our earlier findings of intact object-based priming in MA dependent individuals and suggests that intact priming effects extend across spatial domains. Further, this pattern of sparing suggests that cortical brain systems typically supporting implicit attentional functioning are relatively intact in long-term MA dependent individuals whereas brain systems supporting explicit attentional processes are affected.
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Affiliation(s)
- Ruth Salo
- Department of Psychiatry and Behavioral Sciences, University of California, Davis, USA.
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Nordahl TE, Salo R, Natsuaki Y, Galloway GP, Waters C, Moore CD, Kile S, Buonocore MH. Methamphetamine users in sustained abstinence: a proton magnetic resonance spectroscopy study. ACTA ACUST UNITED AC 2005; 62:444-52. [PMID: 15809412 DOI: 10.1001/archpsyc.62.4.444] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
BACKGROUND Abnormal patterns of metabolite levels have been detected by magnetic resonance spectroscopy in frontostriatal regions of individuals meeting DSM-IV criteria for methamphetamine dependence, but less is known about the effects of drug abstinence on metabolite levels. OBJECTIVE To assess the effects of long-term methamphetamine use and drug abstinence on brain metabolite levels. DESIGN To assess regional specific metabolite levels using magnetic resonance spectroscopy imaging techniques in 2 groups of currently abstinent methamphetamine users: methamphetamine users who recently initiated abstinence and methamphetamine users who had initiated abstinence more than 1 year prior to study. SETTING Participants were recruited from outpatient substance abuse treatment centers. PARTICIPANTS Eight methamphetamine users with sustained abstinence (1 year to 5 years) and 16 recently abstinent methamphetamine users (1 month to 6 months) were compared with 13 healthy, non-substance-using controls. MAIN OUTCOME MEASURES Magnetic resonance spectroscopy measures of N-acetylaspartate-creatine and phosphocreatine (NAA/Cr), choline-creatine and phosphocreatine (Cho/Cr), and choline-N-acetylaspartate (Cho/NAA) ratios were obtained in the anterior cingulate cortex as well as in the primary visual cortex, which served as a control region. RESULTS The absolute values of Cr did not differ between controls and methamphetamine users. Methamphetamine users had abnormally low NAA/Cr levels within the anterior cingulate cortex, regardless of the time spent abstinent (F(2,34) = 12.61; P<.001). No NAA/Cr group differences were observed in the primary visual cortex (F(2,33) = 0.29; P = .75). The Cho/NAA values for the anterior cingulate cortex were abnormally high in the methamphetamine users who recently initiated abstinence but followed a normal pattern in the methamphetamine users who had initiated abstinence more than 1 year prior to study (F(2,34) = 7.31; P = .002). CONCLUSIONS The relative choline normalization across periods of abstinence suggests that following cessation of methamphetamine use, adaptive changes occur, which might contribute to some degree of normalization of neuronal structure and function in the anterior cingulum. More research is needed to elucidate the mechanisms underlying these adaptive changes.
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Affiliation(s)
- Thomas E Nordahl
- Department of Psychiatry and Behavioral Sciences, University of California Davis Medical Center, 4701 X Street, Sacramento, CA 95817, USA.
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Salo R, Nordahl TE, Moore C, Waters C, Natsuaki Y, Galloway GP, Kile S, Sullivan EV. A dissociation in attentional control: evidence from methamphetamine dependence. Biol Psychiatry 2005; 57:310-3. [PMID: 15691533 DOI: 10.1016/j.biopsych.2004.10.035] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2004] [Revised: 08/03/2004] [Accepted: 10/20/2004] [Indexed: 10/25/2022]
Abstract
BACKGROUND Selective attention comprises multiple, dissociable component processes, including task shifting and selective inhibition. The goal of this study was to test whether task-shifting, selective inhibition, or both processes were impaired in long-term but currently abstinent methamphetamine-dependent individuals. METHODS Participants were 34 methamphetamine-dependent subjects and 20 nonsubstance abusing controls who were tested on an alternating-runs switch task with conflict sequences that required subjects to switch tasks on every second trial (AABBAABB). RESULTS Methamphetamine-dependent individuals committed more errors on trials that required inhibition of distracting information compared with controls (methamphetamine = 17%; controls = 13%; p = .02). By contrast, error rates did not differ between the groups on switch trials (methamphetamine = 7%; controls = 6%; p = .68). CONCLUSIONS These results indicate that selective inhibition, but not task switching, is selectively compromised by methamphetamine.
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Affiliation(s)
- Ruth Salo
- Department of Psychiatry and Behavioral Sciences and the Imaging Research Center, University of California-Davis 95817, USA.
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Kitsuki H, Iwasaki K, Yoshitomi S, Matsuura Y, Natsuaki Y, Torisu M. An adult case of bleeding Meckel's diverticulum diagnosed by preoperative angiography. Surg Today 1993; 23:926-8. [PMID: 8298239 DOI: 10.1007/bf00311374] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A 19-year-old woman in her 6th month of pregnancy was admitted to our hospital after passing a massive bloody stool. Romanoscopy and upper gastrointestinal panendoscopy revealed no abnormality, but a superior mesenteric arteriography demonstrated an embryonic artery with the extravasation of contrast medium in the distal end of the ileal artery. After the diagnosis of a bleeding Meckel's diverticulum had been established, an emergency operation was successfully performed. At laparotomy, a Meckel's diverticulum was found, about 70 cm toward the oral side from the ileocecal valve, and part of the ileum, including the diverticulum, was resected. Histological examination indicated that the diverticulum had a normal ileal layer with ectopic gastric mucosa and pancreatic tissue. Furthermore, multiple ulcers were observed in the adjacent ileum. Blood coagulation was observed at the site of one of these ulcers, and this was presumed to be the source of the hemorrhage.
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Affiliation(s)
- H Kitsuki
- First Department of Surgery, Kyushu University Faculty of Medicine, Fukuoka, Japan
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Affiliation(s)
- Y Ikushima
- Kurume University School of Medicine, Department of Obstetrics and Gynecology, Fukuoka, Japan
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Natsuaki Y. [Experimental induction of teratoma in rats]. Nihon Sanka Fujinka Gakkai Zasshi 1983; 35:1783-90. [PMID: 6415187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
To induce an experimental teratoma, fetuses of Wistar strain rats were removed from the uterus, and the visceral yolk sac was left hanging through the fetectomy incision. After several weeks of this treatment, a tumor developed in these animals with or without both side oophorectomy. Despite the fact that the visceral yolk sac is composed of endoderm and mesoderm, the tissues in the resulting tumor obtained from the ectopically implanted yolk sac showed derivatives from all three germ layers, including skin, bone, gut and nervous tissues. Changes in hormonal environment induced by oophorectomy did not affect the process of experimental tumor induction. When 7,12-dimethylbenz-(a)-anthracene (DMBA) was directly applied to the yolk sac at the fetectomy, a neoplasm mainly consisted of yolk sac elements was investigated after two to four months of the treatment. From the results of this experiment, it was seemed that an embryonic and extraembryonic teratomatous tumor might have been derived from the visceral yolk sac.
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Nishida T, Nishida T, Sugiyama T, Oda T, Miyahara K, Miyoshi T, Natsuaki Y, Kamura N, Yakushiji M, Kato T. [Induced rat ovarian carcinoma showing mainly squamous components--an experimental approach to common epithelial tumors]. Nihon Sanka Fujinka Gakkai Zasshi 1982; 34:1853-8. [PMID: 6816874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Female Wistar strain rats were treated with a chemical carcinogen DMBA (7,12-Dimethylbenz (a) anthracene) implanted directly into their ovary. In this method of tumor induction, adenocarcinoma commonly developed in the ovary by the direct carcinogenic effect of DMBA during a 30 weeks observation period. However, two cases of primary ovarian carcinoma showing mainly squamous components have been found in a recent experiments. The histological characteristics of these indicated that they were adenoacanthoma and adenosquamous cell carcinoma and both were derived ultimately from the ovarian surface epithelium with interposition of endometrioid type tumor. These two cases of experimental rat ovarian cancer consist of mainly squamous element are studied morphologically and their histogenesis is discussed.
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Yakushiji M, Tsunawaki A, Nishida T, Nishimura H, Natsuaki Y, Inoue T, Kato T. Chemotherapy of malignant ovarian tumors; therapeutic results of ifosfamide. Acta Obstet Gynaecol Jpn 1981; 33:1071-6. [PMID: 7304132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Here are reported the therapeutic results of ifosfamide on primary ovarian malignancies in 30 cases which were treated at Kurume University Hospital from September 1978 to December 1980. These cases were advanced or recurrent ones, and histologically, they consisted of serous cystadenocarcinoma in 22 cases, mucinous cystadenocarcinoma in 2, unclassified adenocarcinoma in 1, and malignant teratoma in 5. In the ifosfamide therapy, 2 grams or 40 mg/kg per day were given intravenously for 5 consecutive days, and as observing the blood state and the general condition, it was repeated every 3 weeks. The drug was given from 1 to 7 courses, and the average was 3.3 courses. The effect was evaluated by Koyama-Saito's criteria and Karnofsky's criteria; the response rate was 48% in the adenocarcinoma group and 20% in the malignant teratoma by the former criteria, while the rate was 64% and 20%, respectively, by the latter one. As main side effects, there were seen hemorrhagic cystitis, nausea and vomiting, and the myelotoxicity was low.
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Yakushiji M, Nishida T, Sugiyama T, Mitamura T, Natsuaki Y, Nagano H, Tsunawaki A, Kato T. Malignant degeneration of benign cystic teratomas of the ovary. Acta Obstet Gynaecol Jpn 1981; 33:1095-8. [PMID: 7304134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
In 10 years from January 1971 to January 1981, 145 cases with cystic teratoma were treated at Kurume University Hospital, and malignant degeneration was seen in 7 of them (4.8%). Their age distribution was from 43 to 78 years, and the mean age was 59 years; the distribution shifted to the older side. The malignant degeneration was squamous cell carcinoma in all of the cases, and in 1 case carcinoma in situ leads to invasive carcinoma was observed continuously to a normal epithelium; it was interesting histogenetically. In their prognoses 3 out of 7 cases died (1 case dying from decrepitude) but the rest 4 have been surviving for 4 to 10 years.
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