In high resolution computed tomography (CT) using flat panel detectors, imperfect or defected detector elements cause stripe artifacts in sinogram which results in concentric ring artifacts in the image. Such ring artifacts obscure image details in the regions of interest of the image. In this article, novel techniques are proposed for the detection, classification, and correction of ring artif...

Purpose: Obtaining a tissue sample diagnostic of pulmonary Langerhans cell histiocytosis (PLCH) by transbronchial biopsy is notoriously difficult. The condition’s appearance on computed tomography is well described and singularly characteristic, perhaps adequate for definitive diagnosis. We propose an approach to diagnosis of these patients. Methods: Radiology case report of PLCH in a middle-ag...

PURPOSE Since the first report of TRAM flap reconstruction, there have been numerous studies to reduce complications of elective breast reconstruction. Current methods of preoperative perforator localization can be time-consuming, inaccurate, and imprecise. Thus, we sought to evaluate ultra-high resolution 3D CT angiography for the preoperative mapping of DIEAP flap perforating vessels. METHO...

Scan chain diagnosis is essential to solving yield-reduction problem caused by the miniaturization of manufacturing process. The accurate scan faults that frequently occur in initial process vital for rapidly improving yield. Moreover, importance with a high resolution multiple increasing because early stages process, further cost physical failure analysis. Although can be diagnosed existing me...

A 60-year-old man (figure 1) was referred with an incidental abnormality in the right lower zone of his chest X-ray. He was otherwise well. Forty years previously a segment of his left lower lobe had been removed for a benign lesion. Two siblings had died from intracranial haemorrhage. High-resolution computed tomography (CT) scan of the thorax (figure 2) was performed. Before any treatment was...

When patient anatomy is positioned away from a CT scanner's isocenter, scans of limited diagnostic value may result. Yet in some cases, positioning of patient anatomy far from isocenter is unavoidable. This study examines the effect of posi-tion and reconstruction algorithm on image resolution achieved by a CT scanner operating in a high resolution (HR) scan mode which incorporates focal spot d...

A 60-year-old man (figure 1) was referred with an incidental abnormality in the right lower zone of his chest X-ray. He was otherwise well. Forty years previously a segment of his left lower lobe had been removed for a benign lesion. Two siblings had died from intracranial haemorrhage. High-resolution computed tomography (CT) scan of the thorax (figure 2) was performed. Before any treatment was...