introduction: pulmonary embolism (pe) is a common lethal disease that its clinical symptoms may be seen in many other diseases. computed tomography pulmonary angiography (ctpa) is a valuable diagnostic modality for detection of pe. in addition, it can accurately detect the other diseases with clinical symptoms similar to pe. the aim of this study is to evaluate the frequency of pe and nonemboli...

in present pet/ct scanners, pet attenuation correction is performed by relying on the information given by ct scan. in the ct-based attenuation correction methods, dual-energy technique (dect) is the most accurate approach, which has been limited due to the increasing patient dose. in this feasibility study, we have introduced a new method that can implement dual-energy technique with only a si...

This article describes data related to a research article titled "Estimation of myocardial extracellular volume fraction with cardiac CT in subjects without clinical coronary artery disease: A feasibility study", Kurita et al. (in press) [1]. Myocardial extracellular volume fraction (ECV) is an imaging biomarker that can elevate in various heart diseases. This article describes correlation betw...

Advanced applications of materials need sophisticated measurement methods for research, process development and quality control. X-ray Computed Tomography (CT) is a very powerful method for non-destructive testing of materials. A CT-scanner generates a series of X-ray attenuation measurements, which are used to produce computed reconstructed images of an object. In the last years 3D-CT systems ...

Fig. 1. Perfusion CT scan showing extensive perfusion defects in the bilateral carotid territories and whole brainstem (arrow). Extensive deficits of cerebral blood flow (CBF) and cerebral blood flow volume (CBV) represent a large ischemic core in the bilateral hemispheres and brainstem. Fig. 2. CT angiogram showing tapered occlusions of both internal carotid arteries and occlusion of the basil...

Flexion-extension x-rays are almost exclusively employed to analyze cervical spine kinematics. Yet, 2D radiographic measures of key vertebral metrics used to evaluate cervical stability are limited by x-ray source beam divergence, magnification errors and off-axis image acquisition. Three-dimensional CT images can be used to accurately measure these parameters, however flexion-extension CT scan...

Helical computed tomography (CT) started in the years of '90, enable faster scan acquisition and faster data reconstruction. Multislice CT (MSCT) is the latest technology in this decade, functioning by acquiring multiple simultaneous slices using multi-detector system. Most advanced and contemporary models are the 64-slices machine, dual source CT machine and the 256-slices machine. The last-me...