BACKGROUND Low-resolution images may be acquired in magnetic resonance imaging (MRI) due to limited data acquisition time or other physical constraints, and their resolutions can be improved with super-resolution methods. Since MRI can offer images of an object with different contrasts, e.g., T1-weighted or T2-weighted, the shared information between inter-contrast images can be used to benefit...

Figure 1: (A) Transaxial T2-weighted image showing a clear structural relationship of the tumour and blood vessels. (B) Coronal T2-weighted image showing the tumour with heterogeneous signal intensity, and predominantly with high signal intensity. (C) Coronal-enhanced T1-weighted image showing a huge tumour: 21.5 × 8.4 × 9.8 cm, encompassing the left common carotid artery, pressing against the ...

Local weighted tree languages over semirings are introduced. For an arbitrary semiring, a weighted tree language is shown to be recognizable iff it appears as the image of a local weighted tree language under a deterministic relabeling.

Introduction: There is data to indicate that there is substantial variability in ADC values of the brain between 1.5T and 3T. To our knowledge, there is no currently published data comparing 1.5 to 3T SS EPI in the abdomen, particularly in terms of ADC reproducibility and image quality. In this study, we performed DWI of healthy volunteers at both 1.5T and 3T using low and high b-values to asse...

the goal of multi-frame super resolution (sr) is to fuse multiple low resolution (lr) images to produce one high resolution (hr) image. the major challenge of classic sr approaches is accurate motion estimation between the frames. to handle this challenge, fuzzy motion estimation method has been proposed that replaces value of each pixel using the weighted averaging all its neighboring pixels i...

Further, a technique known as adaptive decision based filtering is proposed and applied.filter to the recently developed theory of optimal weighted median filtering. Weighted median filters for image and image sequence restora.Abstract A new median-based filter, progressive switching median. Index Terms Image enhancement, impulse detection, median filter, nonlinear filter.shown that relaxed med...

Chondromyxoid fibroma of frontal bone is a rare lesion. Plain skull films showed a round radiolucent mass with a sclerotic margin. It was dense on plain CT scan and showed no convincing contrast enhancement. MR imaging showed low signal intensity relative to gray matter on T1-weighted image (500/20), isointensity on proton-density image (2000/30), high intensity on T2-weighted image, and marked...

Picture 1. Difusion-weighted image (TR4500, TE105) showed a hyperintense lesion in the left striatum and multiple smal hypointense lesions in the brain stem, the cerebelum, and the thalamus (Picture 1 A-D). Gradient-echo T2*-weighed image (TR540, TE18) demonstrated multiple hypointense lesions in the same areas as the DWI showed multiple hypointense lesions (Picture 1 EH). T2-weighted image (TR...

Purpose: Diffusion-weighted Imaging (DWI) using readout-segmented EPI (rs-EPI) with 2D navigator correction [1] is an alternative to standard single-shot EPI (ss-EPI) that improves image quality by reducing susceptibility artifacts and allowing a higher spatial resolution. This improved image quality raises the possibility that the low b-value image could be used to replace a separate T2-weight...