OBJECTIVE The purpose of our study was to assess whether a review of multiphasic helical CT combined with the previous serial CT images could be helpful to depict a viable tumor in hepatocellular carcinoma treated with transarterial chemoembolization. MATERIALS AND METHODS Twenty-four consecutive patients with 35 hepatocellular carcinomas underwent transarterial chemoembolization followed by ...

Introduction In CT imaging, metallic implants inside the tissues cause metal artifact that reduce the quality of image for diagnosis. In order to reduce the effect of this artifact, a new method with more appropriate results has been presented in this research work. Materials and Methods The presented method comprised of following steps: a) image enhancement and metal areas extraction, b) sinog...

The purpose of this study was to identify the anatomic structures of the abdominal region of cat throughcomputed tomography (CT) to be used by veterinary radiologists, clinicians and surgeons. The abdominalregion of four cats were scanned twice, with and without using contrast medium in a same position, usinghigh-resolution imaging protocol. Slice intervals were 11 mm and were adjusted so that ...

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...

The present study proposed a novel projection display system based on a virtual reality enhancement environment. The proposed system displays stereoscopic images of fractures and enhances the computed tomography (CT) images. The diagnosis and treatment of fractures primarily depend on the post-processing of CT images. However, two-dimensional (2D) images do not show overlapping structures in fr...

Figure 1. The initial staging FDG PET/CT images (Figure 1A [Maximum intensity projection (MIP) image]), showed intense hypermetabolic retroperitoneal lymph nodes (SUVmax:8,4) (arrow heads in Figure 1B [coronal PET, CT and fusion PET/CT images] and C [axial PET, CT and fusion PET/CT images]) and segmental FDG uptake in the inferior vena cava below renal veins suggestive for tumor thrombus (SUVma...

Introduction: Lung cancer is one of the most common causes of cancer-related deaths worldwide. Nowadays PET/CT plays an essential role in radiotherapy planning specially for lung tumors as it provides anatomical and functional information simultaneously that is effective in accurate tumor delineation. The optimal segmentation method has not been introduced yet, however several ...

PURPOSE To analyze the error in contouring the brainstem for patients with head and neck cancer who underwent radiotherapy (RT) based on computed tomography (CT) and magnetic resonance (MR) images. METHODS 20 patients with brain tumor and 17 patients with nasopharyngeal cancer (NPC) were randomly selected. Each patient underwent MR and CT scanning. For each patient, one observer contoured the...

An average CT brain image is constructed to serve as reference frame for inter-subject registration. A set of 96 clinical CT images is used. Registration includes translation, rotation, and anisotropic scaling. A temporary average based on a subset of 32 images is constructed. This image is used as reference for the iterative construction of the average CT image. This approach is computationall...

BACKGROUND To investigate the feasibility and accuracy of dose calculation in cone beam CT (CBCT) data sets. METHODS Kilovoltage CBCT images were acquired with the Elekta XVI system, CT studies generated with a conventional multi-slice CT scanner (Siemens Somatom Sensation Open) served as reference images. Material specific volumes of interest (VOI) were defined for commercial CT Phantoms (CA...