Introduction: The rapid use of computed tomography (CT) scan is of great concern, due to increase in patients’ dose. Optimization of CT protocol is a vital issue in dose reduction. This study aimed to optimize radiation dose in cranial CT and assess modifications in image quality under radiation dose reduction. Material and Methods: A poly(me...

background and aims. cone-beam computed tomography (cbct) is an imaging system which has many advantages over computed tomography (ct). in ct scan, hounsfield unit (hu) is proportional to the degree of x-ray attenuation by the tissue. in cbct, the degree of x-ray attenuation is shown by gray scale (voxel value). the aim of the present study was to investigate the relationship between gray scale...

In the last 20 years, the use of computed tomography (CT) to evaluate thoracic diseases has rapidly gained popularity and CT has become firmly established as an important research and diagnostic modality. In particular, CT has played an important role in improving our knowledge about the pathophysiology of the adult respiratory distress syndrome (ARDS) and in determining the morphological and f...

abstract   purpose: the aim of this study was to report the main ct scan and mri findings of gliomas in a group of iranian patients. material and methods: the mri and ct scan of 96 pathologically proven patients of gliomas were retrospectively evaluated in a period of five years in our university affiliated hospital. we included all cases who had both ct scan and mri in our study. results: amon...

Study objectives: This study was performed to determine whether transbronchial needle aspiration (TBNA) biopsy under CT guidance can increase its diagnostic yield so that this technique can be used for staging of lung cancer at our institution. Study design: After an initial unacceptable low yield of TBNA on the first 10 patients (20% positive), we switched the biopsy procedure from the broncho...

SNOMED CT is a large and complex medical terminology. Thousands of editing operations are applied to its content for each new release. Understanding what changed in a release is important for the end user and SNOMED CT editors. Each SNOMED CT release comes with release notes that provide a brief description of the changes that occurred and a set of “delta” files that identify individual changes...