presence and extent of emphysema can be determined by visual assessment of areas of abnormally low attenuation or by objective quantification based on the attenuation values. HR-CT scans at 1 cm intervals were studied to determine whether the relative area of lung occupied by attenuation values lower than a given threshold could be used as an indication of emphysema [24]. The strongest correlat...

BACKGROUND A quarter of all patients presenting to emergency departments are children. Although there are several large, well-conducted studies on adults enabling accurate selection of patients with head injury at high risk for computed tomography scanning, no such study has derived a rule for children. AIM To conduct a prospective multicentre diagnostic cohort study to provide a rule for sel...

CLINICAL QUESTION Is lumbar puncture still needed in suspected subarachnoid hemorrhage with a negative head computed tomographic scan performed within 6 hours of headache onset? ARTICLE CHOSEN Perry JJ, Stiell IG, Sivilotti ML, et al. Sensitivity of computed tomography performed within six hours of onset of headache for diagnosis of subarachnoid haemorrhage: prospective cohort study. BMJ 2011...

OBJECTIVES To examine patient, hospital, and geographic characteristics influencing variation in computed tomography (CT) scan use in inpatients in New York State. STUDY DESIGN Retrospective cohort study. METHODS We used the 2007 healthcare cost and utilization project's state inpatient database from the agency for healthcare research and quality and applied descriptive univariate statistic...

OBJECTIVE To assess the diagnostic accuracy of triphasic spiral CT in differentiating benign from malignant focal tumoral liver lesions. METHODS The study was conducted in Department of Radiology of Aga Khan University Hospital and Sind Institute of Urology and Transplantation, Karachi from Feb 2006 to Feb 2007. By convenient sampling, 45 patients found to have focal tumoral liver lesions wer...

.. Ring enhancing lesions are a common neurological problem seen in either gender and in all age groups. Objectives: To determine the clinical presentations and etiological factors in patients with ring enhancing lesion on CT scan brain. Design: Case series study. Period: One year. Setting: Department of medicine, Liaquat University Hospital, Hyderabad. Patients and methods: Subjects of either ...

The computer algorithm used to reconstruct CT scanner images is very computationally intensive, which forces medical equipment manufacturers to strike a balance among image resolution, image generation time, and system cost when designing a new CT scanner. Cost-effective performance acceleration for image reconstruction would allow manufacturers to generate higher resolution CT images while mai...

BACKGROUND Primary to validate a commercial semi-automated computed tomography angiography (CTA) -software for vulnerable plaque detection compared to histology of carotid endarterectomy (CEA) specimens and secondary validating calcifications scores by in vivo CTA with ex vivo non-contrast enhanced computed tomography (NCCT). METHODS From January 2014 to October 2016 53 patients were included...

Three-dimensional high-resolution images of density distributions were obtained on unsplit cores using a medical X-ray computed tomography (CT) scanner. The resolution of CT scanning is about 0.6 mm2 and allows a 5-mm depth for beam width. Electrical resistivity measurements were also conducted to know porosity at high depth resolution after core splitting. Wholeround core samples for this stud...

Mesenteric phlebosclerosis is also known as phlebosclerotic colitis. Mesenteric phlebosclerosis is a rare disease related to non–thrombotic stenosis or occlusion of mesenteric veins, which can lead to subsequent ischaemic colitis. This report presents the relevant radiological features in a Chinese adult with mesenteric phlebosclerosis. The clinical and pathological aspects of this entity are a...