Diffusion-weighted imaging (DWI) is a form of MR imaging based upon measuring the random Brownian motion of water molecules within a voxel of tissue. In general simplified terms, highly cellular tissues or those with cellular swelling exhibit lower diffusion coefficients. See more A great deal of confusion exists in the way the clinicians and radiologists refer to diffusion restriction, with both groups often appearing to not actually understand what they are referring to. The first problem is that the term … See more As opposed to essentially free diffusion of water kept inside a container, diffusion of water inside brain tissue, for example, is hindered primarily by cell membrane boundaries. The … See more A variety of techniques for generating diffusion maps have been developed. By far the most commonly used technique relies on a spin-echo echo-planar sequence (SE-EPI) although non-EPI techniques (e.g. … See more Diffusion-weighted imaging has a major role in the following clinical situations 3-5: 1. early identification of ischemic stroke 2. differentiation of acute from chronic stroke 3. differentiation of acute stroke from other stroke mimics 4. … See more WebNov 26, 2024 · It elicited high signal in DWI, in low b values, with rapid signal decayed in high b values, showing the same signal intensity of normal thyroid tissue at b value 1000, with corresponding high signal intensity at ADC map (free diffusion), ADC value = 2.21 × 10 −3 s/mm 2 (high) Full size image
Clinical applications of diffusion-weighted sequence in brain …
WebThis demonstrated multiple punctate lesions within the basal ganglia, and cerebral white matter radiations of low intensity on T1 and high intensity on T2-weighted scans and reduced diffusivity on DWI (Fig 1 *A*–*C*), which is suggestive of CFE. In addition, there was a background of diffuse subtle white matter signal intensity abnormality ... maverick inventory
Suspicious lung lesions for malignancy: the lesion-to-spinal cord ...
WebNov 1, 2024 · A high-intensity signal along the corticomedullary junction on DWI has been described as a specific MR imaging finding of the cerebrum in neuronal … WebApr 11, 2024 · The qualitative assessment of the lesions was performed in the T2WI, DWI, and ADC mapping. The lesions with high T2 signal intensity are considered suspicious in comparison to fibrotic lesions with low T2 signal intensity. Extra-pleural space, mediastinal or vascular invasions were carefully observed. WebNov 6, 2024 · DWI is an adaptation of a routine T2W pulse sequence with application of two symmetric diffusion-sensitizing gradients (dephasing vs. rephasing) before and after the 180° RF pulse. Within a restricted-diffusion area, water protons do not move long distances. maverick investigations nh