Magnetic resonance (MR) images obtained in 18 patients with pathologically confirmed mycetoma in the body (n = 4) or lower extremity (n = 14) were retrospectively reviewed and compared with computed tomographic (CT) scans in 15 patients and surgical findings in 10. T1-weighted images showed an infiltrating mass (same signal intensity as muscle) involving skin, subcutaneous fat, muscles, tendons, and other tissues. On T2-weighted images, the mass and affected structures showed moderately increased signal intensity. Bone marrow involvement was detected in seven patients and was best visualized on T1-weighted images. CT showed moderate enhancement of the infiltrative process in all patients. Bone changes, seen in nine, included coarse trabeculation, periosteal reaction, endosteal proliferation, and patchy destruction. MR imaging and CT were comparable and correlated well with surgery in showing the extent of soft-tissue involvement. Early bone changes (important for therapy planning for pedal mycetoma) were seen only at CT. The study showed that MR imaging is sensitive for assessing the extent of mycetoma in the soft tissues. CT should be the method of choice for staging pedal lesions because it can be used to detect early bone involvement.
The rate of discrepancy fell steeply between the second and fifth year of the residents training from 18.5% to 6.9%. Our study suggests that it is reasonable to have on-call radiology residents perform the preliminary interpretations of 64-slice CT for PE studies.
Purpose: The aim of this study was to determine the efficacy of compressed sensing reconstructions for specific clinical neuroimaging applications of magnetic resonance imaging beyond more conventional k-space under-sampling approaches such as parallel imaging and simple low-resolution acquisitions.Methods: Four routine clinical neuroimaging pulse sequences were chosen for this study due to their long acquisition time. In a series of blinded studies, three board-certified radiologists independently evaluated compressed sensing, parallel imaging, and low-resolution images at up to 5x accelerations. Experiments on synthetic brain images with artificial but realistic lesions were carried out to assess diagnostic accuracy for the detection of non-specific white matter lesions, permitting controlled evaluation of shift-variant compressed sensing reconstructions.Results: Ringing and blurring were identified as the primary artifacts that hinder diagnostic quality of combined compressed sensing and parallel imaging reconstructions. The findings indicate that up to 5x acceleration is possible by a combined compressed sensing and parallel imaging reconstruction. However, efficacy of compressed sensing reconstructions as well as the improvement in image quality over the more conventional parallel imaging and low-resolution acquisitions appear to vary with pulse sequence.Conclusion: Mild to moderate accelerations are possible for those sequences by a combined compressed sensing and parallel imaging reconstruction while maintaining diagnostic quality of reconstructions. Nevertheless, for certain sequences/applications one might mildly reduce the acquisition time by appropriately reducing the imaging resolution while maintaining diagnostic quality/accuracy, rather than the more complicated compressed sensing reconstruction.
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