نتایج جستجو برای: t2 relaxometry
تعداد نتایج: 31231 فیلتر نتایج به سال:
The brain's myelin content can be mapped by T2-relaxometry, which resolves multiple differentially relaxing T2 pools from multi-echo MRI. Unfortunately, the conventional fitting procedure is a hard and numerically ill-posed problem. Consequently, the T2 distributions and myelin maps become very sensitive to noise and are frequently difficult to interpret diagnostically. Although regularization ...
INTRODUCTION Chronically relapsing inflammation, tissue remodeling and fibrosis are hallmarks of inflammatory bowel diseases. The aim of this study was to investigate changes in connective tissue in a chronic murine model resulting from repeated cycles of dextran sodium sulphate (DSS) ingestion, to mimic the relapsing nature of the human disease. MATERIALS AND METHODS C57BL/6 mice were expose...
PURPOSE To assess the reproducibility and stability of hippocampal T2 relaxation times and examine the effects of patients' age, seizures, and duration of epilepsy on this measure. METHODS Hippocampal T2 relaxation times were measured in 63 patients with chronic epilepsy (55 with partial and 8 with idiopathic generalized seizures) using a Carr-Purcell-Meiboom-Gill sequence, echo times 22 to 2...
Background: Iron accumulation in organs such as heart and liver can cause morbidity and mortality in transfusion-dependent patients with β-thalassemia major. MRI T2* relaxometry has been increasingly used in clinical practice for quantitative assessment of iron overload in heart and liver. For a heavily iron loaded liver, T2* is ultra-short (<1ms). In this scenario, conventional gradient echo s...
BACKGROUND AND PURPOSE Assessment of bone marrow is most commonly performed qualitatively in the spine or other large long bones. The craniofacial bones are less ideal for bone marrow analysis because of the relatively small bone marrow volume. Because patients with SCD often undergo repeated brain imaging to evaluate for cerebral vaso-occlusive disease, quantitative assessment of craniofacial ...
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