Background and purpose: Proper diagnosis of patients with COVID-19 is one of the challenges in medical centers. RT-PCR is the standard and reference test in diagnosis of patients with COVID-19. This study aimed at accelerating the correct diagnosis of COVID-19 and the diagnostic power of chest CT scan and RT-PCR. Materials and methods: This study was performed in 569 patients with COVID-19 adm...

Juxtacortical chondrosarcoma is a rare primary malignant cartilaginous tumor accounting for 0.2% of all bone tumors. Wide surgical resection is the treatment of choice for juxtacortical chondrosarcomas. Accurate preoperative diagnosis is important in ensuring appropriate management, staging, and treatment of the patient. A combination of radiographs, three-dimensional imaging with computerized ...

Current methods of four-dimensional (4D) CT imaging of the thorax synchronise the acquisition with a respiratory signal to restrospectively sort acquired data. The quality of the 4D images relies on an accurate description of the position of the thorax in the respiratory cycle by the respiratory signal. Most of the methods used an external device for acquiring the respiratory signal. We propose...

Diagnostic imaging is a principal method of analysis in modern medicine. Doctors and other medical professionals gain invaluable information about their patients through medical scans such as X-Rays, computed tomography (CT) cans, and magnetic resonance imaging (MRI). With this visual information, medical practitioners diagnose and monitor the health of their patients, and medical researchers g...

background: the i-space is a radiological imaging system in which computed tomography (ct)-scans can be evaluated as a three dimensional hologram. the aim of this study is to analyze the value of virtual reality (i-space) in diagnosing acute occult scaphoid fractures.   methods: a convenient cohort of 24 patients with a ct-scan from prior studies, without a scaphoid fracture on radiograph, yet ...

BackgroundComputed tomography (CT) scan is the standard for assessment of femoral torsion. This observational study was conducted to evaluate comparability EOS radiation dose scanning system (EOS imaging, Paris, France) and CT in patients with suspected torsional malalignment femur.MethodsPatients femur were included a surgical planning. The primary endpoint compare 3-dimensional radiological (...

objective(s): in this study, we aimed to describe the characteristics of portal vein tumor thrombosis (pvtt), complicating hepatocellular carcinoma (hcc) in contrast-enhanced fdg pet/ct scan. methods: in this retrospective study, 9 hcc patients with fdg-avid pvtt were diagnosed by contrast-enhanced fluorodeoxyglucose positron emission tomography/computed tomography (fdg pet/ct), which is a comb...

In many applications surfaces containing a large number of primitives occur. Geometry compression reduces storage space and transmission time for such models. A special case is given by polygonal isosurfaces generated from gridded volume data. However, most current state-of-the-art geometry compression systems do not capitalize on the structure that is characteristic of such isosurfaces, namely...

Fast variance prediction for iteratively-reconstructed helical CT images is useful for analysis of resulting images and potentially for dynamic dose adjustment during a scan. Previous methods require impractical computation times to approximate the image variance; other methods are able to approximate variance quickly but only for specific CT geometries, excluding 3D helical CT. In this paper w...