Tsyh-jyi Hsieh - Academia.edu (original) (raw)

Papers by Tsyh-jyi Hsieh

Diagnostics

Magnetic resonance elastography (MRE) has been used to successfully characterize the mechanical b... more Magnetic resonance elastography (MRE) has been used to successfully characterize the mechanical behavior of healthy and diseased muscles, but no study has been performed to investigate the reliability of MRE on lumbar muscles. The objective of this work was to determine the reliability of MRE techniques on lumbar muscles in both ex vivo phantom and in vivo human studies. In this study, fresh porcine leg muscles were used in the phantom study, and 80 healthy adults (38.6 ± 11.2 years, 40 women) were recruited in the human study. Five repeated stiffness maps were obtained from both the phantom and human muscles by using a gradient-echo MRE sequence with a pneumatic vibration on a 1.5 T MR scanner. The technical failure rate, coefficient of variation (CV), and quality score were assessed to evaluate the reliability of MRE, respectively. Analysis of variance was performed to compare the stiffness between different lumbar muscles, and the difference was significant if p < 0.05 after B...

Chinese journal of radiology, 2000

The traditional technique of lumbar puncture in myelography may have a relatively low success rat... more The traditional technique of lumbar puncture in myelography may have a relatively low success rate and uses much more time in difficult cases. A more reliable and easier technique, a fluoroscopy-guided cephalic angled approach, has been developed for difficult cases.

PLOS ONE

Purpose End-stage renal disease (ESRD) patients exhibit silent white-matter alterations after lon... more Purpose End-stage renal disease (ESRD) patients exhibit silent white-matter alterations after long-term hemodialysis, which may be due to ESRD itself or the hemodialysis. The purpose of this study was to investigate the longitudinal white-matter alterations in the ESRD patients under 3-year long-term hemodialysis using voxel-wise analysis of diffusion tensor imaging (DTI). Materials and methods 15 ESRD patients and 15 age-matched healthy controls participated in this study. Due to the development of abnormal brain lesions in some cases, 13 ESRD patients and 13 age-matched healthy controls were enrolled and underwent cognitive function assessment and DTI acquisition at two-time points separated by 3 years. Voxel-based analysis was performed to globally detect white-matter alterations between the two groups as well as between the two scans within the two groups. Results In the ESRD patients, diffusivity indices were significantly increased and the fractional anisotropy was significantly decreased in both scans, as compared with healthy controls. Longitudinal comparisons showed significant white-matter alterations in healthy controls in three years, but little or no significant alterations were noted in the ESRD patients after additional 3-year hemodialysis. Conclusion Poorer white matter integrity and cognitive function are noted in ESRD patients and the toxic effect of ESRD may be the major factor of white matter alterations.

Journal of electrocardiology

The relationship of epicardial fat and cardiac arrhythmias has been described in many studies. Th... more The relationship of epicardial fat and cardiac arrhythmias has been described in many studies. The association of the amounts of epicardial fat and the characteristics of electrocardiogram (ECG) remains unclear. The purpose of this study was to elucidate the association between the amounts of epicardial fat and the characteristics of ECG. A total of 100 consecutive patients who received multi-detector computer tomography (MDCT) were enrolled. The amounts of epicardial fat, including total heart, total atria, total ventricles, right atrium (RA), right ventricle (RV), left atrium (LA), and left ventricle (LV) regions, were measured. The PR interval in lead II, the P wave duration in lead I, the characteristics of inter-atrial conduction block manifested in ECG, the corrected QT interval (QTc) and the QT dispersion of a 12‑lead ECG were measured manually by a computer caliper. The PR interval was correlated with the amounts of epicardial fat including total heart, total atria, total ve...

The British journal of radiology, Jan 3, 2015

Carotid blow-out syndrome (CBS) is a life-threatening complication of head and neck cancer (HNC).... more Carotid blow-out syndrome (CBS) is a life-threatening complication of head and neck cancer (HNC). One of the various methods used for emergency management of CBS is covered stent placement (CSP).Our initial experience in CSP is evaluated and compared with reports of the literature. This study analyzed 17 HNC patients who had received CSP for CBS in Kaohsiung Medical University Chung-Ho Memorial Hospital during May, 2005 to December, 2013. The medical records and images for these patients were retrospectively reviewed to evaluate causes of CBS, treatment success rates and complications. The initial angiography success rate was 100%. Procedural or peri-procedural complications were noted in two (12%) cases, both suffered from cerebral vascular accident (CVA).Short-term complications were noted in eight (47%) cases, including four re-bleeding and four CVA. Medium- to long-term complications were noted in nine cases, which included two asymptomatic in-stent thrombosis, one symptomatic C...

The Journal of Pediatrics, 2007

Radiology, 2009

To characterize and compare regional differences in anisotropy in patients with end-stage renal d... more To characterize and compare regional differences in anisotropy in patients with end-stage renal disease (ESRD) and in control subjects to understand the effect of ESRD and hemodialysis on the microstructures of white matter.

NMR in Biomedicine, 2013

Q-ball imaging (QBI) is an imaging technique that is capable of resolving intravoxel fiber crossi... more Q-ball imaging (QBI) is an imaging technique that is capable of resolving intravoxel fiber crossings; however, the signal readout based on echo-planar imaging (EPI) introduces geometric distortions in the presence of susceptibility gradients. This study proposes an imaging technique that reduces susceptibility distortions in QBI by short-axis PROPELLER EPI acquisition. Conventional QBI and PROPELLER QBI data were acquired from two 3T MR scans of the brains of five healthy subjects. Prior to the PROPELLER reconstruction, residual distortions in single-blade low-resolution b0 and diffusion-weighted images (DWIs) were minimized by linear affine and nonlinear diffeomorphic demon registrations. Subsequently, the PROPELLER keyhole reconstruction was applied to the corrected DWIs to obtain high-resolution PROPELLER DWIs. The generalized fractional anisotropy and orientation distribution function maps contained fewer distortions in PROPELLER QBI than in conventional QBI, and the fiber tracts more closely matched the brain anatomy depicted by turbo spin-echo (TSE) T2-weighted imaging (T2WI). Furthermore, for fixed T(E), PROPELLER QBI enabled a shorter scan time than conventional QBI. We conclude that PROPELLER QBI can reduce susceptibility distortions without lengthening the acquisition time and is suitable for tracing neuronal fiber tracts in the human brain.