There exists a large number of techniques for content-aware smoothing. Despite its simplicity, the PeronaMalik Anisotropic Diffusion method is among the most employed ones. In this work we study this method in detail and propose a generalization of its diffusion scheme using restricted dissimilarity functions to measure the intensity differences between neighbouring pixels. This generalization ...

Chemotherapy-related myelopathy mimicking subacute combined degeneration (SCD) has rarely been reported. We encountered a 35-year-old female with sensory ataxia after intrathecal chemotherapy. Spinal magnetic resonance imaging showed localized abnormal signal areas in the lateral and dorsal white matter, mimicking SCD. Diffusion imaging showed restricted water diffusion and increased microstruc...

Figure (A) Coronal, contrast-enhanced, T1-weighted, head showed a left parietal ring-enhancing multilocular lesion showed restricted diffusion on axial diffusion-we seen on apparent diffusion coefficient (ADC) imaging. Funding: None. Conflict of Interest: None. Authorship: All authors had access to the data and participated in writing the manuscript. Requests for reprints should be addressed to...

Water-diffusion anisotropy (directionality) in the white matter of the brain is defined on the basis of axonal alignment [3]. Water diffusion preferentially diffuses along the axon’s longitudinal axis but is relatively restricted in the perpendicular axis. This phenomenon can be represented mathematically by the so-called diffusion ellipsoid, or tensor. These tensors can be reconstructed to tra...

The time dependence of the apparent diffusion tensor of ex vivo calf heart and tongue was measured for diffusion times (tau(d)) between 32 and 810 ms. The results showed evidence of restricted diffusion in the muscle tissues of both organs. In regions where the myofibers are parallel, the largest eigenvalue (lambda(1)) of the diffusion tensor remained the same for all diffusion times measured, ...

Introduction: Diffusion-weighted magnetic resonance imaging (DWI) is dependent on the micro-structural properties of biological tissues, so it is possible to obtain quantitative structural information non-invasively from DWI measurements (1). However, due to hardware limitations, the diffusion times achieved in practice using conventional pulsed gradient spin echo (PGSE) methods are relatively ...

Knowledge of water diffusion characteristics within the human spinal cord may provide important information about the structural nature of spinal cord pathology. However, the sensitivity of diffusion imaging methods to motion and the requirement for high in-plane resolution has hitherto restricted study of spinal cord diffusion to excised samples. The first diffusion images of the human cervica...

Pulsed field gradient (PFG) nuclear magnetic resonance (NMR) has been used to study self-diffusion characteristics of water and oil in natural peanuts and in peanuts saturated with water. From the dependence on diffusion time of the echo decay due to diffusion, regions of completely restricted diffusion for the oil molecules were identified. The mean size and size distribution function of these...

Background and Purpose—We report on the use of line scan diffusion magnetic resonance imaging in the evaluation of spinal cord infarctions. Methods—Data on 19 patients with clinical findings consistent with spinal cord infarctions and abnormal findings on line scan diffusion imaging were reviewed. The Apparent Diffusion Coefficient (ADC) measurements for the normal spinal cord and for the areas...

PURPOSE Diffusion MRI is used frequently to assess prostate cancer. The prostate consists of cellular tissue surrounding fluid filled ducts. Here, the diffusion properties of the ductal fluid alone were studied. Monte Carlo simulations were used to investigate ductal residence times to determine whether ducts can be regarded as forming a separate compartment and whether ductal radius could dete...