Attenuation correction (AC) is essential for the generation of artifact-free and quantitatively accurate positron emission tomography (PET) images. PET AC based on computed (CT) frequently results in artifacts attenuation-corrected images, these mainly originate from CT PET-CT mismatches. The combined with a magnetic resonance imaging (MRI) scanner (PET/MRI) more complex than PET/CT, given that...

background and objective: magnetic resonance imaging (mri) is the most sensitive technique to detect multiple sclerosis (ms) plaques in central nervous system. in some cases, the patients who were suspected to ms, whereas mri images are normal, but whether patients don’t have ms plaques or mri images are not enough optimized enough in order to show ms plaques? the aim of the current study is ev...

Background Meningitis is a common neurological emergency and a leading cause of death and neurological disability worldwide. MRI is extremely useful for detecting and monitoring the complications of meningitis. The purpose of this study was to describe the brain MRI findings in children with complicated meningitis. Materials and Methods  This cross-sectional study was conducted in Radiology De...

Introduction Quantitative susceptibility mapping (QSM) is a new contrast mechanism in magnetic resonance imaging (MRI). The images produced by the QSM enable researchers and clinicians to easily localize specific structures of the brain, such as deep brain nuclei. These nuclei are targets in many clinical applications and therefore their easy localization is a must. In this study, we aimed to i...

Introduction: Geometric distortion, an important parameter in neurology and oncology. The current study aimed to design and construct a new three-dimensional (3D) phantom using a 3D printer in order to measure geometric distortion and its 3D reproducibility. Material and Methods: In this study, a new phantom ...

Introduction:In this study, ECG signals have been embedded into medical images to create a novel blind watermarking method. The embedding is done when the original image is compressed using the EZW algorithm. The extraction process is performed at the decompression time of the watermarked image. Materials and Methods: The multi-resolution watermarking with a secret key algorithm developed in th...

This paper describes the Curvelets Transform method to get the significant results for the MRI images. To study and understanding of different kinds of MRI Images and formats like jpg, bmp, tiff, png and conversion of real MRI Images into the basic standards using convertor (Image Viewer). Implementation of Curvelets method is done on different image formats. Also the calculation of Mean square...