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Article ; Online: Editorial for "Simultaneous Acquisition of Diffusion Tensor and Dynamic Diffusion MRI".

Wu, Ming-Long / Chung, Hsiao-Wen

Journal of magnetic resonance imaging : JMRI

2022 Volume 57, Issue 4, Page(s) 1093–1094

MeSH term(s)	Humans ; Diffusion Magnetic Resonance Imaging ; Diffusion Tensor Imaging
Language	English
Publishing date	2022-08-25
Publishing country	United States
Document type	Editorial ; Comment
ZDB-ID	1146614-5
ISSN	1522-2586 ; 1053-1807
ISSN (online)	1522-2586
ISSN	1053-1807
DOI	10.1002/jmri.28406
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Article ; Online: Compressive optic neuropathy by pituitary adenoma: may making radiomics delta provide prognostic value after surgery?

Lin, Te-Ming / Chen, Chieh-Yi / Chung, Hsiao-Wen

European radiology

2023 Volume 33, Issue 11, Page(s) 7479–7481

MeSH term(s)	Humans ; Optic Chiasm ; Pituitary Neoplasms/complications ; Pituitary Neoplasms/diagnostic imaging ; Pituitary Neoplasms/surgery ; Prognosis ; Optic Nerve Diseases/diagnostic imaging ; Optic Nerve Diseases/etiology ; Optic Nerve Diseases/surgery ; Adenoma/surgery ; Magnetic Resonance Imaging
Language	English
Publishing date	2023-10-02
Publishing country	Germany
Document type	Editorial ; Comment
ZDB-ID	1085366-2
ISSN	1432-1084 ; 0938-7994 ; 1613-3749
ISSN (online)	1432-1084
ISSN	0938-7994 ; 1613-3749
DOI	10.1007/s00330-023-10274-2
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Article ; Online: Single breath-hold MR T1 mapping in the heart: Hybrid MOLLI combining saturation and inversion recovery.

Yu, Chun-Yang / Huang, Teng-Yi / Chung, Hsiao-Wen

Magnetic resonance imaging

2022 Volume 96, Page(s) 85–92

Abstract: The native T1 values of the myocardium provide valuable information for tissue characterization and assessment of cardiomyopathies. In this study, we proposed a novel hybrid MOLLI sequence for myocardial T1 mapping. Unlike the two groups of inversion- ... ...

Abstract	The native T1 values of the myocardium provide valuable information for tissue characterization and assessment of cardiomyopathies. In this study, we proposed a novel hybrid MOLLI sequence for myocardial T1 mapping. Unlike the two groups of inversion-recovery sampling of the conventional MOLLI5(3 s)3 sequence, the hybrid MOLLI sequence consisted of an inversion-recovery block followed by a saturation-recovery block. Since the second block employed a saturation pulse to spoil the longitudinal magnetization, it did not require a waiting period as MOLLI5(3 s)3 did. As a result, the hybrid MOLLI required less acquisition time leading to a practical application for patients with breath-hold difficulties. Phantom and healthy subject experiments were performed to evaluate the proposed sequence against the MOLLI5(3 s)3 sequence. The phantom study showed that the heart-rate dependency of one variant of the hybrid MOLLI sequences, hbMOLLI4, was comparable to that of MOLLI5(3 s)3. In addition, both hbMOLLI4 and MOLLI53 derived T1 values under 2% variations with simulated heart rates from 50 to 90 beats-per-minute within the range of T1 values for myocardium and blood before contrast administration. Simulation results suggested slightly reduced T1 fitting precision in hbMOLLI4 compared with MOLLI5(3 s)3, but prominently better than saturation recovery. Bland-Altman analysis on accuracy assessment revealed that hbMOLLI4 partially reduced the T1 underestimation of MOLLI5(3 s)3. In the human study, The T1 values of both methods were consistent (hbMOLLI4 vs. MOLLI5(3 s)3, slope = 1.14, R
MeSH term(s)	Humans ; Reproducibility of Results ; Magnetic Resonance Imaging/methods ; Heart/diagnostic imaging ; Myocardium ; Cardiomyopathies ; Phantoms, Imaging
Language	English
Publishing date	2022-12-05
Publishing country	Netherlands
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	604885-7
ISSN	1873-5894 ; 0730-725X
ISSN (online)	1873-5894
ISSN	0730-725X
DOI	10.1016/j.mri.2022.12.001
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Article ; Online: Neurovascular Correlates of Cobalamin, Folate, and Homocysteine in Dementia.

Tu, Min-Chien / Chung, Hsiao-Wen / Hsu, Yen-Hsuan / Yang, Jir-Jei / Wu, Wen-Chau

Journal of Alzheimer's disease : JAD

2023 Volume 96, Issue 3, Page(s) 1329–1338

Abstract: Background: Cobalamin (Cbl) and folate are common supplements clinicians prescribe as an adjuvant therapy for dementia patients, on the presumption of their neurotrophic and/or homocysteine (Hcy) lowering effect. However, the treatment efficacy has been ...

Abstract	Background: Cobalamin (Cbl) and folate are common supplements clinicians prescribe as an adjuvant therapy for dementia patients, on the presumption of their neurotrophic and/or homocysteine (Hcy) lowering effect. However, the treatment efficacy has been found mixed and the effects of Cbl/folate/Hcy on the human brain remain to be elucidated. Objective: To explore the neurovascular correlates of Cbl/folate/Hcy in Alzheimer's disease (AD) and subcortical ischemic vascular dementia (SIVD). Methods: Sixty-seven AD patients and 57 SIVD patients were prospectively and consecutively recruited from an outpatient clinic. Multimodal 3-Tesla magnetic resonance imaging was performed to quantitatively evaluate cerebral blood flow (CBF) and white matter integrity. The relationship between neuroimaging metrics and the serum levels of Cbl/folate/Hcy was examined by using the Kruskal-Wallis test, partial correlation analysis, and moderation analysis, at a significance level of 0.05. Results: As a whole, CBF mainly associated with Cbl/folate while white matter hyperintensities exclusively associated with Hcy. As compared with AD, SIVD exhibited more noticeable CBF correlates (spatially widespread with Cbl and focal with folate). In SIVD, a bilateral Cbl-moderated CBF coupling was found between medial prefrontal cortex and ipsilateral basal ganglia, while in the fronto-subcortical white matter tracts, elevated Hcy was associated with imaging metrics indicative of increased injury in both axon and myelin sheath. Conclusions: We identified the neurovascular correlates of previously reported neurotrophic effect of Cbl/folate and neurotoxic effect of Hcy in dementia. The correlates exhibited distinct patterns in AD and SIVD. The findings may help improving the formulation of supplemental Cbl/folate treatment for dementia.
MeSH term(s)	Humans ; Vitamin B 12 ; Folic Acid ; Alzheimer Disease/pathology ; Dementia, Vascular/diagnostic imaging ; Dementia, Vascular/pathology ; Brain/diagnostic imaging ; Brain/pathology ; Brain Ischemia/pathology ; Homocysteine
Chemical Substances	Vitamin B 12 (P6YC3EG204) ; Folic Acid (935E97BOY8) ; Homocysteine (0LVT1QZ0BA)
Language	English
Publishing date	2023-11-18
Publishing country	Netherlands
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1440127-7
ISSN	1875-8908 ; 1387-2877
ISSN (online)	1875-8908
ISSN	1387-2877
DOI	10.3233/JAD-230763
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Article ; Online: Virtual MOLLI Target: Generative Adversarial Networks Toward Improved Motion Correction in MRI Myocardial T1 Mapping.

Pan, Nai-Yu / Huang, Teng-Yi / Yu, Jui-Jung / Peng, Hsu-Hsia / Chuang, Tzu-Chao / Lin, Yi-Ru / Chung, Hsiao-Wen / Wu, Ming-Ting

Journal of magnetic resonance imaging : JMRI

2024

Abstract: Background: The modified Look-Locker inversion recovery (MOLLI) sequence is commonly used for myocardial T1 mapping. However, it acquires images with different inversion times, which causes difficulty in motion correction for respiratory-induced ... ...

Abstract	Background: The modified Look-Locker inversion recovery (MOLLI) sequence is commonly used for myocardial T1 mapping. However, it acquires images with different inversion times, which causes difficulty in motion correction for respiratory-induced misregistration to a given target image. Hypothesis: Using a generative adversarial network (GAN) to produce virtual MOLLI images with consistent heart positions can reduce respiratory-induced misregistration of MOLLI datasets. Study type: Retrospective. Population: 1071 MOLLI datasets from 392 human participants. Field strength/sequence: Modified Look-Locker inversion recovery sequence at 3 T. Assessment: A GAN model with a single inversion time image as input was trained to generate virtual MOLLI target (VMT) images at different inversion times which were subsequently used in an image registration algorithm. Four VMT models were investigated and the best performing model compared with the standard vendor-provided motion correction (MOCO) technique. Statistical tests: The effectiveness of the motion correction technique was assessed using the fitting quality index (FQI), mutual information (MI), and Dice coefficients of motion-corrected images, plus subjective quality evaluation of T1 maps by three independent readers using Likert score. Wilcoxon signed-rank test with Bonferroni correction for multiple comparison. Significance levels were defined as P < 0.01 for highly significant differences and P < 0.05 for significant differences. Results: The best performing VMT model with iterative registration demonstrated significantly better performance (FQI 0.88 ± 0.03, MI 1.78 ± 0.20, Dice 0.84 ± 0.23, quality score 2.26 ± 0.95) compared to other approaches, including the vendor-provided MOCO method (FQI 0.86 ± 0.04, MI 1.69 ± 0.25, Dice 0.80 ± 0.27, quality score 2.16 ± 1.01). Data conclusion: Our GAN model generating VMT images improved motion correction, which may assist reliable T1 mapping in the presence of respiratory motion. Its robust performance, even with considerable respiratory-induced heart displacements, may be beneficial for patients with difficulties in breath-holding. Level of evidence: 3 TECHNICAL EFFICACY: Stage 1.
Language	English
Publishing date	2024-04-02
Publishing country	United States
Document type	Journal Article
ZDB-ID	1146614-5
ISSN	1522-2586 ; 1053-1807
ISSN (online)	1522-2586
ISSN	1053-1807
DOI	10.1002/jmri.29373
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Article ; Online: Comparative assessment of established and deep learning-based segmentation methods for hippocampal volume estimation in brain magnetic resonance imaging analysis.

Wang, Hsi-Chun / Chen, Chia-Sho / Kuo, Chung-Chin / Huang, Teng-Yi / Kuo, Kuei-Hong / Chuang, Tzu-Chao / Lin, Yi-Ru / Chung, Hsiao-Wen

NMR in biomedicine

2024 , Page(s) e5169

Abstract: In this study, our objective was to assess the performance of two deep learning-based hippocampal segmentation methods, SynthSeg and TigerBx, which are readily available to the public. We contrasted their performance with that of two established ... ...

Abstract	In this study, our objective was to assess the performance of two deep learning-based hippocampal segmentation methods, SynthSeg and TigerBx, which are readily available to the public. We contrasted their performance with that of two established techniques, FreeSurfer-Aseg and FSL-FIRST, using three-dimensional T1-weighted MRI scans (n = 1447) procured from public databases. Our evaluation focused on the accuracy and reproducibility of these tools in estimating hippocampal volume. The findings suggest that both SynthSeg and TigerBx are on a par with Aseg and FIRST in terms of segmentation accuracy and reproducibility, but offer a significant advantage in processing speed, generating results in less than 1 min compared with several minutes to hours for the latter tools. In terms of Alzheimer's disease classification based on the hippocampal atrophy rate, SynthSeg and TigerBx exhibited superior performance. In conclusion, we evaluated the capabilities of two deep learning-based segmentation techniques. The results underscore their potential value in clinical and research environments, particularly when investigating neurological conditions associated with hippocampal structures.
Language	English
Publishing date	2024-05-07
Publishing country	England
Document type	Journal Article
ZDB-ID	1000976-0
ISSN	1099-1492 ; 0952-3480
ISSN (online)	1099-1492
ISSN	0952-3480
DOI	10.1002/nbm.5169
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Article ; Online: Stage-Dependent Cerebral Blood Flow and Leukoaraiosis Couplings in Subcortical Ischemic Vascular Disease and Alzheimer's Disease.

Tu, Min-Chien / Chung, Hsiao-Wen / Hsu, Yen-Hsuan / Yang, Jir-Jei / Wu, Wen-Chau

Journal of Alzheimer's disease : JAD

2022 Volume 86, Issue 2, Page(s) 729–739

Abstract: Background: Alzheimer's disease (AD) and subcortical ischemic vascular disease (SIVD) have both been associated with white matter hyperintensities (WMHs) and altered cerebral blood flow (CBF) although the etiology of AD is still unclear.: Objective: ... ...

Abstract	Background: Alzheimer's disease (AD) and subcortical ischemic vascular disease (SIVD) have both been associated with white matter hyperintensities (WMHs) and altered cerebral blood flow (CBF) although the etiology of AD is still unclear. Objective: To test the hypothesis that CBF and WMHs have differential effects on cognition and that the relationship between CBF and WMHs changes with the subtypes and stages of dementia. Methods: Forty-two patients with SIVD, 50 patients with clinically-diagnosed AD, and 30 cognitively-normal subjects were included. Based on the Clinical Dementia Rating (CDR), the patients were dichotomized into early-stage (CDR = 0.5) and late-stage (CDR = 1 or 2) groups. CBF and WMH metrics were derived from magnetic resonance imaging and correlated with cognition. Results: Hierarchical linear regression revealed that CBF metrics had distinct contribution to global cognition, memory, and attention, whereas WMH metrics had distinct contribution to executive function (all p < 0.05). In SIVD, the WMHs in frontotemporal areas correlated with the CBF in bilateral thalami at the early stage; the correlation then became between the WMHs in basal ganglia and the CBF in frontotemporal areas at the late stage. A similar corticosubcortical coupling was observed in AD but involved fewer areas. Conclusion: A stage-dependent coupling between CBF and WMHs was identified in AD and SIVD, where the extent of cortical WMHs correlated with subcortical CBF for CDR = 0.5, whereas the extent of subcortical WMHs correlated with cortical CBF for CDR = 1-2.
MeSH term(s)	Alzheimer Disease/pathology ; Cerebrovascular Circulation/physiology ; Humans ; Leukoaraiosis/diagnostic imaging ; Magnetic Resonance Imaging/methods ; Vascular Diseases/pathology ; White Matter/pathology
Language	English
Publishing date	2022-04-07
Publishing country	Netherlands
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1440127-7
ISSN	1875-8908 ; 1387-2877
ISSN (online)	1875-8908
ISSN	1387-2877
DOI	10.3233/JAD-215405
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Article ; Online: Measurements of venous oxygen saturation in the superior sagittal sinus using conventional 3D multiple gradient-echo MRI: Effects of flow velocity and acceleration.

Cheng, Chou-Ming / Chou, Chih-Che / Yeh, Tzu-Chen / Chung, Hsiao-Wen

Magnetic resonance in medicine

2020 Volume 85, Issue 2, Page(s) 995–1003

Abstract: Purpose: This work investigates the effects of flow acceleration in the superior sagittal sinus on slice-dependent variations in venous oxygen saturation (SvO: Methods: Three-dimensional multiple gradient-echo images, with first-order flow ... ...

Abstract	Purpose: This work investigates the effects of flow acceleration in the superior sagittal sinus on slice-dependent variations in venous oxygen saturation (SvO Methods: Three-dimensional multiple gradient-echo images, with first-order flow compensation along the anterior-posterior readout direction for the first echo, were acquired twice from 15 healthy volunteers. For all slices, phases within the superior sagittal sinus were fitted using linear regression across four TEs to obtain the Pearson's correlation coefficients (PCCs), the largest of which corresponded to minimum acceleration influence. SvO Results: Slice-dependent difference in SvO Conclusion: Slice-dependent variations in SvO
MeSH term(s)	Acceleration ; Humans ; Magnetic Resonance Imaging ; Oximetry ; Oxygen ; Superior Sagittal Sinus
Chemical Substances	Oxygen (S88TT14065)
Language	English
Publishing date	2020-08-20
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	605774-3
ISSN	1522-2594 ; 0740-3194
ISSN (online)	1522-2594
ISSN	0740-3194
DOI	10.1002/mrm.28474
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Article: Gradient- and spin-echo (GRASE) MR imaging: a long-existing technology that may find wide applications in modern era.

Chu, Mei-Lan / Chien, Cheng-Ping / Wu, Wen-Chau / Chung, Hsiao-Wen

Quantitative imaging in medicine and surgery

2019 Volume 9, Issue 9, Page(s) 1477–1484

Language	English
Publishing date	2019-07-31
Publishing country	China
Document type	Editorial
ZDB-ID	2653586-5
ISSN	2223-4306 ; 2223-4292
ISSN (online)	2223-4306
ISSN	2223-4292
DOI	10.21037/qims.2019.09.13
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Article: Magnetic resonance cholangiopancreatography at 3T in a single breath-hold: comparative effectiveness between three-dimensional (3D) gradient- and spin-echo and two-dimensional (2D) thick-slab fast spin-echo acquisitions.

Chien, Cheng-Ping / Chiu, Feng-Mao / Shen, Yen-Chun / Chen, Yi-Hsun / Chung, Hsiao-Wen

Quantitative imaging in medicine and surgery

2020 Volume 10, Issue 6, Page(s) 1265–1274

Abstract: Background: To compare the depiction conspicuity of three-dimensional (3D) magnetic resonance cholangiopancreatography (MRCP) based on gradient- and spin-echo (GRASE) and two-dimensional (2D) thick-slab MRCP using fast spin-echo (FSE) in different ... ...

Abstract	Background: To compare the depiction conspicuity of three-dimensional (3D) magnetic resonance cholangiopancreatography (MRCP) based on gradient- and spin-echo (GRASE) and two-dimensional (2D) thick-slab MRCP using fast spin-echo (FSE) in different segments of hepatic and pancreatic ducts at 3T. Methods: Both 3D GRASE and 2D thick-slab FSE MRCP, with parameters adjusted under the constraints of specific absorption rate and scan time within single breath-hold, were performed for 95 subjects (M/F =49:46; age range, 25-75) at 3T. Conspicuity of eight ductal segments was graded by two experienced raters using a 4-point score. Situations where one technique is superior or inferior to the other were recorded. Results: 3D GRASE MRCP outperformed 2D thick-slab FSE MRCP in the common bile duct and common hepatic ducts (both with P<0.001), but compared inferiorly in the right hepatic ducts (P<0.001), right posterior hepatic ducts (P<0.005) and pancreatic duct distal (P<0.05). Performing both 3D and 2D MRCP would reduce the number of non-diagnostic readings in the left hepatic duct to 10 remaining (5.3%), compared with 31 (16.3%) or 21 (11.1%) out of 190 readings if using 3D GRASE or 2D thick-slab FSE alone, respectively. Conclusions: Although 3D GRASE MRCP is preferential to visualize the common bile duct and common hepatic duct within one single breath-hold, the complementary role of 2D thick-slab FSE MRCP in smaller hepatic and pancreatic ducts makes it a useful adjunct if performed additionally.
Language	English
Publishing date	2020-06-04
Publishing country	China
Document type	Journal Article
ZDB-ID	2653586-5
ISSN	2223-4306 ; 2223-4292
ISSN (online)	2223-4306
ISSN	2223-4292
DOI	10.21037/qims.2020.04.14
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