background: a variable resolution x-ray (vrx) ct scanner provides a great increase in the spatial resolution. in vrx ct scanners, the spatial resolution of the system and its field of view (fov) can be changed according to the object size. one of the main factors that limit the spatial resolution of vrx ct scanner is the effect of the x-ray focal spot. materials and methods: a theoretical study...

Improvements in multislice computed tomography (MSCT) angiography of the coronary vessels have enabled the minimally invasive detection of coronary artery stenoses, while quantitative coronary angiography (QCA) is the accepted reference standard for evaluation thereof. Sixteen-slice MSCT showed promising diagnostic accuracy in detecting coronary artery stenoses haemodynamically and the subseque...

Craniocervical bone pneumatization in humans is very rare: only a handful of cases have been reported, predominantly in males (1). The characteristic air-filled bones are prone to fracture, even following minor trauma. Our case report (2) recently published in the December 2011 issue of Diagnostic and Interventional Radiology described abnormal extensive craniocervical bone pneumatization in a ...

The purpose of our study was to assess the role of a 64-slice multidetector CT (MDCT) scanner in the characterization of different solid renal masses, using a simplified approach to correct the postenhancement attenuation values. The study included 96 consecutive adults (58 men, 38 women) with renal masses; 93 with unilateral and three with bilateral masses. All of our patients underwent multip...

DESCRIPTION Cardiac involvement is uncommon (0.02–2%) in hydatid disease and the most common location is in the left ventricle, followed by interventricular septum and right ventricle. The clinical presentation of hydatid disease depends on the location of the cysts, and diagnosis is usually made by CT and/or high-resolution MRI. We are presenting an extremely rare manifestation of hydatid dise...

The operation of the bowtie filter in x-ray CT is correct if the object being scanned is properly centered in the scanner's field-of-view. Otherwise, the dose delivered to the patient and image noise will deviate from optimal setting. We investigate the effect of miscentering on image noise and surface dose on three commercial CT scanners. Six cylindrical phantoms with different size and materi...

INTRODUCTION For accurate dose calculations, it is necessary to provide a correct relationship between the CT numbers and electron density in radiotherapy treatment planning systems (TPSs). The purpose of this study was to investigate the energy dependence of measured CT numbers on substituted materials used for CT number calibration of radiotherapy TPSs and the resulting errors in the treatmen...

Even with recent advances in computed tomography (CT) imaging of coronary stents, blooming is still an important limitation in the assessment of stents. Recently, the introduction of bioabsorbable radiolucent scaffolds has allowed almost unrestricted imaging of the stent lumen. A 68-year-old man with a history of coronary artery disease was admitted with non-ST-elevation myocardial infarction. ...

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...